I just traded for a Slash that has bullet connectors. I'd never seen them before and had no idea what I was looking at, but I could tell the guy wasn't trying to scam me, so I just went with it. Now I see how cool they are and I'm really happy. Thanks for explaining stuff.
Every contact is a point of resistance , so using the xt90s each wire path between battery and esc has 4 points of contact . Using only the bullets you only have 2 points of contact, one at the bullet and one at the esc. Depending on the size of the bullet it could have more or less resistance than the connectors inside a xt90. PS I use xt90’s on everything
Not sure if it's been mentioned. But the only way to properly do this test is if you were to have those bullet connectors hooked up to a battery. And test on the other side of the bullet connectors. That connection is going to cause resistance. Maybe the exact same resistance that the xt90 has. The absolute best would be solder the wires directly from the ESC to the battery
I think someone else mentioned this as well. My idea though, is that the resistance from plugging the bullet connectors into the battery, is the same resistance I'd get there with the XT90 connectors connecting to the battery. The point of the test was to see the resistance between just the wire running to the battery terminals, and how much more resistance was added by adding a connector in that wire
@@FullThrottleRC Exactly. Anytime solder or a joint is involved there will be a resistance. You should get an infrared reading device. Run The vehicle at a high load. Then infrared the wires and the connectors. It will tell you where you're having lost through heat signature.
i wonder how an ic5 would have compared. ic5 connectors are .5mm wider and 4mm longer (per side, positive and negative) than xt90 connectors. i would imagine they would have a bit less resistance than xt90s.
That's interesting. I've never used IC5 connectors other than installing them for a customer. I wonder just how much of a difference that little bit would make.
but how much impedance, curious with wires in close proximity if there is any increase in impedance with interlocking magnetic fields under load and increased flow.
Honestly I think that's a little to "in detail" for what we're doing here. I admittedly do not know much about that, but I'd have to imagine it isn't affecting much with the length of the wire and the size of everything on top of the current we're drawing.
The reason I won't use xt90 on a race vehicle (1/8 buggy/truggy) is the mass of the xt90 plug itself. It can disconnect on a jump/crash during a race. bullet connectors won't.
Getting information is never a "letdown". I try to take in as much info as possible. I would be very interested in seeing if there was a difference between an XT90 That has 4.5 mm bullet connectors inside Vs a EC5/IC5 connector that has 5 mm bullets inside. I know I've read quite often that larger bullets offer less resistance but kind of curious that how much. Seeing this video leads me to think very minimal between XT90 and EC5. Maybe more noticeable going from an XT90 to 6mm or larger. Great content keep it up
so I’ve seen a lot of people have the issue with the 22s drag car when they do burnouts and passes the tires run the body and destroy the paint. Is there a 1.9 drag tire or a way to stop the rubbing that you recommend?
I run tape on the inside of my body. A little duct tape or masking tape, gorilla tape, whatever you have, put it on the inside where the tire would rub to protect the body.
Weight is something else I didn't even realize at first! When it comes to the big xt90 connectors, those are a nice bit of weight you can take out of the car!
If I am seeing your test correctly there is another variable that you didn't hold consistent. Solder is a terrible conductor. The free wire ends on your xt90 set up appeared to be soldered. The bullet connector set had raw ends
You are correct, that's something I didn't think of as the xt90 came from an old esc while the bullets are on brand new wire. I'm curious how much resistance solder would add to a circuit, could be something else to test
good to know. I use bullet connectors in my "racers" mainly because it's easier to put/take batteries between races and also looks tidier under the "hood"
I'll say that the XT90s were a bit easier for me for charging simplicity since they were the same as all of my other batteries, but it has been simple in the car.
Absolutely! The longer the wire, the more resistance it'll have. I can't face my battery the opposite direction right now because of my battery strap. I may be able to redesign it to allow the posts clearance though.
Technically yes, which is why I believe there is a little more resistance when using xt90s. The current has to pass through a second set of "connectors" when coming through the battery leads and the connector. With the bullet connector straight to the battery, those connectors are the "battery leads" in that instance.
Dont Change Your Connectors ~ Hears Why ~ The Batteries With Bullets Connectors Have More Resistance Because The Female Bullets In The Batteries Have A 14awg Wire or Smaller That Connect The Bullets To The Battery Cells Witch Cause More Resistance Then A 10awg Wire Coming Straight From The Battery Cells. Open Up A Old Bullet Connector Battery & You Will See What Im Talking About...I Hope This Helps
Why are you running such long leads? Turn your battery around, and put the terminal's closest to the ESC and Motor. You are already 3D printing your own brace, so make it with relief areas for the bullets. Save yourself the extra wire length. This will also allow you to make one lead longer than the other to help prevent connecting the battery in reverse, and cooking your ESC.
Not sure if you can see it in the video, but if you check out my battery strap, it covers the poles of the battery if I turn it around. I wanted to do that to shorten the leads but I couldn't plug in the bullets that way.
@@FullThrottleRC yeah, I can see that. Like I said, because you're designing, iterating, and 3D printing it yourself, just design in the cut outs to accommodate the terminal's and bullets for turning the battery around. (Semi off topic, I highly recommend the 1up Racing "heat sink" style bullets for ease of removal)
Check out some of the other comments to see the full explanation but I didn't include that since both the bullet connectors I'm using and the XT90s, both have to plug into the female sockets on the battery.
You didn't take into account that even with bullet connectors, you still have a plug where the bullet connects to the battery terminal. There will be additional resistance at that connection.
I've talked about this in a few comments before but I didn't take that into account as that would be roughly the same as the resistance between the connection between the leads and actual positive and negative terminals of the battery. There is probably a small amount of added resistance in the bullets but I believe it would be a tiny difference between it and the resistance of the connection from the battery terminals to the positive and negative leads on a typical battery
The female of the bullet is a part of the battery so it's a constant as it's a part of the circuit with both connectors. What I didn't take into account is I actually should've had a set of male bullets on one end of the xt90 since it has to plug into those bullets in the battery
I bit late to this thread but: As you said V = I x R Difference in ohms reading about 0.02 Ohms At Max current draw of xt90, 90A (if available) 0.02 x 90 = 1.8 V of voltage drop But over the two leads, that's approx 3.6v due to the resistance...
Ok so youre measuring a full "bullit connector inside the xt90 against half a bullit on the wire.. why didnt you actualy fit the other half of the bullit on the wire?!?!?!
I'm not sure if I understand what you're getting at. The xt90 connector is what it would be from the battery, through the connector, to the ESC. The bullet connectors are the same, straight from the battery to the ESC. The bullets don't go to anything but the battery, not another side of a connector.
I'm not quite sure what you mean by this since I'm not measuring anything on the battery itself. I'm testing the resistance in the leads from the positive and negative on the battery, to the ESC
@@FullThrottleRC the battery houses the female of the interconnection. You should simulate this by using a female connector over top of your make and then probe for resistance
@@dbzacs both connectors would have that same female connection in the battery so that is a constant. I wanted to check the variation of the different connectors
Test was invalid because your metre not a milli amp meter. Also you first measured five with just the multimeter leads then somehow you got lower resistance after meaning your metre is not accurate
this isn't really a fair comparison. You can't check the resistance with the whole connection of a bullet. I would say check just one side of the XT90 and its probably about the same as a bullet.
I agree but that's the point, the resistance in the xt90 is almost doubled from the resistance using a bullet connector cause the current has to flow through both sides of the xt90 connector. I'm checking the total resistance across the wire from the battery to the ESC with each connector
Note taken, but if there is more resistance in one circuit than the other while not under load, then the voltage drop will be worse in the circuit with more resistance.
@@FullThrottleRC it might be up to a certain amperage. Tiny wire might have less resistance but the bigger one will have a lot less voltage drop under load.
you're metering a short. you aren't metering ohms unless you are actually metering a resistor, that actually will give you a reading. what you're reading on the meter is a short because you have the two leads touching, just with the wire in between.
Ohms is just the unit of electrical resistance. So the ohms reading when you place a lead on each side of a length of wire is the electrical resistance of that piece of wire. A resistor will read much more electrical resistance, or ohms, cause that’s its job. It’s an electrical component that resists electrical current. But a length of wire can still read ohms on a meter as wire has some electrical resistance as well.
completely inaccurate, a real XT90 should have a contact resistance of 0.3milliOhm aka 0.0003Ohm that means that since your multimeter cant even read more accurate than 0.1Ohm, this is already completely false ofcourse that changes overtime, due to the fact every insertion is wearing the connector a bit but you have to do something real stupid to get an xt90 up to that resistance, like let it sit and corrode in salt water or something Yes, it is one contact point less but take 0.6mOhm cuz it goes through it twice, you're looking at 0.06V loss at 100A, not more that means to measure that you already need a 100A power supply and an accurate multimeter to get a real ohm reading or a super accurate multimeter that can go down to 0.001V *accurately* and a 10A lab psu to measure the real ohms volts over the whole wire & connector / 10A = your ohms so if it measures 0.001V at 10A, you've got 0.0001 Ohm / 0.1mOhm resistance since 10A lab psus are readily available and multimeters that can go down to 0.001V aswell, that is a way to REALLY get the Real resistance
Also xt90 is too heavy.. for racing we want the car to be as light as possible.. 😁 every grams matters.. xt90 is good for bashing like MTs doing high jumps, backflip, front flip..😂
Your test is flawed. Your xt90 test goes through both male and female connectors. Your bullet test is only going through one side of the complete bullet connection.
That's because the amperage from the battery has to pass through both ends of the xt90 connector while using the bullet connectors, they plug straight into the battery. If I was just replacing the xt90s with a male and female bullet connector then you'd be correct, but the bullet connectors are plugging directly into the battery where the xt90s would have to plug into the same place in the battery and then pass through both male and female ends of the xt90 connectors. Hope that clears it up.
I just traded for a Slash that has bullet connectors. I'd never seen them before and had no idea what I was looking at, but I could tell the guy wasn't trying to scam me, so I just went with it. Now I see how cool they are and I'm really happy. Thanks for explaining stuff.
Glad I could help explain some things. Good luck!
Every contact is a point of resistance , so using the xt90s each wire path between battery and esc has 4 points of contact . Using only the bullets you only have 2 points of contact, one at the bullet and one at the esc. Depending on the size of the bullet it could have more or less resistance than the connectors inside a xt90. PS I use xt90’s on everything
I love the xt90s, run them on everything I have. I'm interested to see how the less resistance helps in racing
Awesome! Glad to see someone use the tools to prove it and not just run a car switch run again and guess if it’s right or not. A+ work my man!
Really appreciate that!!
Wow 50% less resistance. Thank you for answering a question I had too.
👍🏻🙌🏻
Not sure if it's been mentioned. But the only way to properly do this test is if you were to have those bullet connectors hooked up to a battery. And test on the other side of the bullet connectors. That connection is going to cause resistance. Maybe the exact same resistance that the xt90 has. The absolute best would be solder the wires directly from the ESC to the battery
I think someone else mentioned this as well. My idea though, is that the resistance from plugging the bullet connectors into the battery, is the same resistance I'd get there with the XT90 connectors connecting to the battery. The point of the test was to see the resistance between just the wire running to the battery terminals, and how much more resistance was added by adding a connector in that wire
@@FullThrottleRC Exactly. Anytime solder or a joint is involved there will be a resistance. You should get an infrared reading device. Run The vehicle at a high load. Then infrared the wires and the connectors. It will tell you where you're having lost through heat signature.
This was a great learning video. You should make more of them as you do them so well.
Thank you! I'd like to cover some more topics but I know I'm not the most knowledgeable on everything. Just trying to share the knowledge I have.
Excellent episode. You did a great job explaining resistance through connectors.
Thank you!!
i wonder how an ic5 would have compared. ic5 connectors are .5mm wider and 4mm longer (per side, positive and negative) than xt90 connectors. i would imagine they would have a bit less resistance than xt90s.
That's interesting. I've never used IC5 connectors other than installing them for a customer. I wonder just how much of a difference that little bit would make.
No surprises here. And a bullet setup just looks better :)
but how much impedance, curious with wires in close proximity if there is any increase in impedance with interlocking magnetic fields under load and increased flow.
Honestly I think that's a little to "in detail" for what we're doing here. I admittedly do not know much about that, but I'd have to imagine it isn't affecting much with the length of the wire and the size of everything on top of the current we're drawing.
The reason I won't use xt90 on a race vehicle (1/8 buggy/truggy) is the mass of the xt90 plug itself. It can disconnect on a jump/crash during a race. bullet connectors won't.
I can't say I've ever had one come unplugged without the battery flying completely out of the car but that is a good point!
Am thinking to use high-current bullet connectors to make Ebike batteries more serviceable.
Getting information is never a "letdown". I try to take in as much info as possible.
I would be very interested in seeing if there was a difference between an XT90 That has 4.5 mm bullet connectors inside Vs a EC5/IC5 connector that has 5 mm bullets inside. I know I've read quite often that larger bullets offer less resistance but kind of curious that how much. Seeing this video leads me to think very minimal between XT90 and EC5. Maybe more noticeable going from an XT90 to 6mm or larger.
Great content keep it up
Thank you! I think I may have an EC5 connector laying around from my Arrma Notorious, I can look into that!
I think the resistance on that connector would go up as the temperature goes up at a higher rate than the bullets.
so I’ve seen a lot of people have the issue with the 22s drag car when they do burnouts and passes the tires run the body and destroy the paint. Is there a 1.9 drag tire or a way to stop the rubbing that you recommend?
I run tape on the inside of my body. A little duct tape or masking tape, gorilla tape, whatever you have, put it on the inside where the tire would rub to protect the body.
@@FullThrottleRC I think it would have to be something thick tho unless u run a smaller tire tho
Good information!
Thank you!
I’m going with bullet connectors soon. It doesn’t only look cleaner, it frees up space and it’s grams lighter
Weight is something else I didn't even realize at first! When it comes to the big xt90 connectors, those are a nice bit of weight you can take out of the car!
If I am seeing your test correctly there is another variable that you didn't hold consistent. Solder is a terrible conductor. The free wire ends on your xt90 set up appeared to be soldered. The bullet connector set had raw ends
You are correct, that's something I didn't think of as the xt90 came from an old esc while the bullets are on brand new wire. I'm curious how much resistance solder would add to a circuit, could be something else to test
Solder has resistance
good to know. I use bullet connectors in my "racers" mainly because it's easier to put/take batteries between races and also looks tidier under the "hood"
I'll say that the XT90s were a bit easier for me for charging simplicity since they were the same as all of my other batteries, but it has been simple in the car.
What chassis are you using?
Associated sc5m
why xt90 instead of ec5 or ic5?
That's just what I always ran on my RCs. I'm pretty sure they're really similar, I just went for XT90s first and stuck with them.
@@FullThrottleRC ic5's resistence and amp limits are WAY better, so it may be an option for you instead of bullets. :)
Awesome, does the length of wire make a difference in resistance? I'm thinking, if you face the battery the other direction.
Absolutely! The longer the wire, the more resistance it'll have. I can't face my battery the opposite direction right now because of my battery strap. I may be able to redesign it to allow the posts clearance though.
Isn’t there bullet connectors in those yellow housing?
Technically yes, which is why I believe there is a little more resistance when using xt90s. The current has to pass through a second set of "connectors" when coming through the battery leads and the connector. With the bullet connector straight to the battery, those connectors are the "battery leads" in that instance.
Dont Change Your Connectors ~ Hears Why ~ The Batteries With Bullets Connectors Have More Resistance Because The Female Bullets In The Batteries Have A 14awg Wire or Smaller That Connect The Bullets To The Battery Cells Witch Cause More Resistance Then A 10awg Wire Coming Straight From The Battery Cells. Open Up A Old Bullet Connector Battery & You Will See What Im Talking About...I Hope This Helps
That would be IR..
Why are you running such long leads? Turn your battery around, and put the terminal's closest to the ESC and Motor. You are already 3D printing your own brace, so make it with relief areas for the bullets. Save yourself the extra wire length. This will also allow you to make one lead longer than the other to help prevent connecting the battery in reverse, and cooking your ESC.
Not sure if you can see it in the video, but if you check out my battery strap, it covers the poles of the battery if I turn it around. I wanted to do that to shorten the leads but I couldn't plug in the bullets that way.
@@FullThrottleRC yeah, I can see that. Like I said, because you're designing, iterating, and 3D printing it yourself, just design in the cut outs to accommodate the terminal's and bullets for turning the battery around. (Semi off topic, I highly recommend the 1up Racing "heat sink" style bullets for ease of removal)
Would an EC5 be worse?
I believe the EC5 has 5mm bullets in it just like the XT90 so they should be very similar
What about a qs8 connector
Don't think I've seen a qs8 connector before, don't have experience with them.
I don't know how much of a difference it would make but your test is missing the resistance from the female bullet receptacle in the battery.
Check out some of the other comments to see the full explanation but I didn't include that since both the bullet connectors I'm using and the XT90s, both have to plug into the female sockets on the battery.
You didn't take into account that even with bullet connectors, you still have a plug where the bullet connects to the battery terminal. There will be additional resistance at that connection.
I've talked about this in a few comments before but I didn't take that into account as that would be roughly the same as the resistance between the connection between the leads and actual positive and negative terminals of the battery. There is probably a small amount of added resistance in the bullets but I believe it would be a tiny difference between it and the resistance of the connection from the battery terminals to the positive and negative leads on a typical battery
I think you need the female on the bullet as well and the comparison should show more accurate results.
The female of the bullet is a part of the battery so it's a constant as it's a part of the circuit with both connectors. What I didn't take into account is I actually should've had a set of male bullets on one end of the xt90 since it has to plug into those bullets in the battery
I bit late to this thread but:
As you said V = I x R
Difference in ohms reading about 0.02 Ohms
At Max current draw of xt90, 90A (if available)
0.02 x 90 = 1.8 V of voltage drop
But over the two leads, that's approx 3.6v due to the resistance...
Yep! I've been running the bullets ever since and have made some improvements!
Ok so youre measuring a full "bullit connector inside the xt90 against half a bullit on the wire.. why didnt you actualy fit the other half of the bullit on the wire?!?!?!
I'm not sure if I understand what you're getting at. The xt90 connector is what it would be from the battery, through the connector, to the ESC. The bullet connectors are the same, straight from the battery to the ESC. The bullets don't go to anything but the battery, not another side of a connector.
Also, you can't measure what you lose after the female connector on the battery
I'm not quite sure what you mean by this since I'm not measuring anything on the battery itself. I'm testing the resistance in the leads from the positive and negative on the battery, to the ESC
@@FullThrottleRC the battery houses the female of the interconnection. You should simulate this by using a female connector over top of your make and then probe for resistance
@@dbzacs both connectors would have that same female connection in the battery so that is a constant. I wanted to check the variation of the different connectors
That is not the appropriate way to measure the resistance, especially when the resistance is very low
Test was invalid because your metre not a milli amp meter. Also you first measured five with just the multimeter leads then somehow you got lower resistance after meaning your metre is not accurate
Anytime you got less connections you got less resistance that's all it is to it
I have to agree!!
this isn't really a fair comparison. You can't check the resistance with the whole connection of a bullet. I would say check just one side of the XT90 and its probably about the same as a bullet.
I agree but that's the point, the resistance in the xt90 is almost doubled from the resistance using a bullet connector cause the current has to flow through both sides of the xt90 connector. I'm checking the total resistance across the wire from the battery to the ESC with each connector
I dont race and i know my dummy ass would fry my esc weekly with bullet lol so im staying wit my xt90 was actually thinking about going ic5
Hahaha there's a reason I went with bright red heat shrink on the positive lead!
This is a fairly useless comparison. The voltage drop should be measured while load is applied to the circuit.
Note taken, but if there is more resistance in one circuit than the other while not under load, then the voltage drop will be worse in the circuit with more resistance.
@@FullThrottleRC it might be up to a certain amperage. Tiny wire might have less resistance but the bigger one will have a lot less voltage drop under load.
you're metering a short. you aren't metering ohms unless you are actually metering a resistor, that actually will give you a reading. what you're reading on the meter is a short because you have the two leads touching, just with the wire in between.
Ohms is just the unit of electrical resistance. So the ohms reading when you place a lead on each side of a length of wire is the electrical resistance of that piece of wire. A resistor will read much more electrical resistance, or ohms, cause that’s its job. It’s an electrical component that resists electrical current. But a length of wire can still read ohms on a meter as wire has some electrical resistance as well.
completely inaccurate, a real XT90 should have a contact resistance of 0.3milliOhm aka 0.0003Ohm
that means that since your multimeter cant even read more accurate than 0.1Ohm, this is already completely false
ofcourse that changes overtime, due to the fact every insertion is wearing the connector a bit
but you have to do something real stupid to get an xt90 up to that resistance, like let it sit and corrode in salt water or something
Yes, it is one contact point less
but take 0.6mOhm cuz it goes through it twice, you're looking at 0.06V loss at 100A, not more
that means to measure that you already need a 100A power supply and an accurate multimeter to get a real ohm reading
or a super accurate multimeter that can go down to 0.001V *accurately* and a 10A lab psu to measure the real ohms
volts over the whole wire & connector / 10A = your ohms
so if it measures 0.001V at 10A, you've got 0.0001 Ohm / 0.1mOhm resistance
since 10A lab psus are readily available and multimeters that can go down to 0.001V aswell, that is a way to REALLY get the Real resistance
Also xt90 is too heavy.. for racing we want the car to be as light as possible.. 😁 every grams matters.. xt90 is good for bashing like MTs doing high jumps, backflip, front flip..😂
Actually true and something I never really thought about!! We're talking about really small amounts of weight but it is added weight nonetheless
@@FullThrottleRC we go as far as titanium/CF/alum parts and screws for racing .. 🤣
Your test is flawed. Your xt90 test goes through both male and female connectors. Your bullet test is only going through one side of the complete bullet connection.
That's because the amperage from the battery has to pass through both ends of the xt90 connector while using the bullet connectors, they plug straight into the battery. If I was just replacing the xt90s with a male and female bullet connector then you'd be correct, but the bullet connectors are plugging directly into the battery where the xt90s would have to plug into the same place in the battery and then pass through both male and female ends of the xt90 connectors. Hope that clears it up.
@@FullThrottleRCThe battery has the "female" side of the connector.