THE GREAT SNORKEL DEBATE! | "De-restricting" a Yamaha R7 (and more Dyno charts!)
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- เผยแพร่เมื่อ 17 ก.ย. 2024
- This keeps popping up over and over again online "Remove your snorkel and you'll make all the power in the world" "You won't be able to keep your front wheel on the ground" "Make sure you re-tune the bike because you'll get so much more air"
We've given you the results from a LAMS R7, now finally we can give you the results from a 689cc R7. Unsurprisingly they're about the same, remove the snorkel and you'll drop a bit of top end power, but gain some in the middle. Replace it with the DNA filter and lid and you still won't gain anything up top, but you'll get a bit more in the middle.
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We are not trained motorcycle mechanics, so please be safe and responsible when making modifications to your vehicles and do not take anything that we do as strict advice. If you have any doubts about what you're doing always consider talking to a qualified mechanic
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I spoke to a local shop about flashing my R7 and he said the exact same thing about the after-market stage 2 filter. nothing really to gain by it except that it is easier to clean out and reuse vs stock filter being more tedious to clean. thanks for the confirmation and work you put into testing out the difference between the two.
Thanks for the feedback!
Finnaly ! Many thanks for doing the test ! It was myth for awhile does it help or not ! Thanks again for doing test
Great video, I have 2021 XSR 700 UK model and have the snorkel with the tube going right down into the air Filter. I bought a complete spare airbox to cut the offending tube into the air Filter off flush with the airbox lid, but from what you are saying from your tests, I would do better to take the spare lid and open the inlet aperture out to just smaller than the opening in the standard air filter to get a healthy dollop of extra power in the middle of the reve range. I have already fitted a Leo Vince exhaust system so imagine a flashed ECU to suit exhaust and intake mods would benefit any possible lean condition
Yessir! Opening up the oem lid will net you better results. More flow is much better! With a full system and opened up airbox, tuning is definitely required!
Let us know your results when you do! Remember to test with the standard lid/snorkel and then your modified one, to see the gains & differences.
I am going to get the ECU remapped with an off the shelf "air filter and exhaust system" flash from Wiz Performance in Leeds UK. I will then remove the snorkel and open out and chamfer the airbox lid and may then go to a local dyno purely to make sure the AFR is in the safe zone. I never got base readings before I fitted the exhaust system, I m not bothered by the the power figures..... its really nice now, but would be rude not to take advantage of some free airflow. Really enjoyed your video, stealing others dyno experience is a cheap way to gain power. Thanks for your responses and encouragement. I bet the UK spec XSR700/MT07 air filter to throttle body runners would be usefull in your neck of the woods?
you REALLY needed to look at the fuelling in the same context.. by improving the "flow" with fewer restrictions, & to see increases in power (torque) at lower rpm where the physics suggests should make lesser improvements than at the top where less restrictive higher flow logically will return better gains.. strongly suggests a weak lean fueling.. then theres steady state flow potential vs induction pulses.. as well as the effects of the area around the inlet to the box.. dont under estimate effects of turbulences once the bikes moving at speed.. have you yried the trumpet 180deg the other direction as an example.. just to see.. but a/f ratio NEEDS to be looked at before ANY conclusions can be made
You're not wrong, but in this case tuning is something that we'd like to tackle separately.
The fuelling in the R7 is a bit annoying from factory, it's lean through the middle, but very rich up the top end. Hopefully we'll be able to look into it a bit in the future.
@@BB22Racing revisiting vids brings up interesting perspective shifts .. what you are doing, is still "tuning" !!! .. this is an area I've looong been fascinated with since the early 80s & the monocoque F1 racers Steve Roberts designed & built & beat factory F1 bikes in the day .. he designed a still air induction system "into" those bikes .. the whole monocoque carbon seat tail section was the airbox .. 2 of which by the way the 1st EVER all carbon fibre chassis's (full monocoque that John Britton took his ideas "directly" from) .. if you have access to an airflow rig will return much more reliable answers .. the top plate NEEDS to integrate a mushroom trumpet that rolls right round into the air box removing entirely the corner inside the top plate so air streams better to the top part of the filter element.. the bigger the radius on that mushroom lip the better the whole airbox will flow.. the same for the throttle trumpets into the airbox.. they NEED to be rolled right round to form a fully inverted rim.. air flows into the trumpets from every space & potentially interferes with air streaming.. as near as can be achieved, linearly. If ONLY Yamaha had given their bike a decent twin spar chassis.. that steel thing is she i t. !!
you also have habe a duel snokle in the front f the air box should change them over to, the throttle don't fully throttle ether so need to sand a little down to boost the extra power
Yes, the intake runners from the airbox to the throttle bodies have restrictors on the LAMS model bikes, that can be chopped out and smoothed back to essentially mimic the 'HO' runners.
So instead of buying a new lid for that larger opening, what if I just use a dremel and make a larger opening on my OEM lid? Thoughts if this will work?
Yes, you should be able to get more air into the airbox, just be careful not to go bigger than the air filter opening. There are some shops that do that as a part of their 'de-restricting'.
I removed just the snorkel and it seems to make a difference from 4 k rpm up, also seemed to rev "free'r" over 8 k rpm. No other mods currently on 2022 60th Anniversary Edition in USA.
Same bike , same mod. Not tried it out yet.
Can you do a video on de restricting the inlet to the airbox
Yep! I've been a bit busy prepping the SV for racing, but I'll get that video out soon!
@@BB22Racing legend 🤙
@@BB22Racing second that would help tremendously
@@Emmasnail3356 Sorry about the delay with the other video, hopefully it'll be done soon!
Did you test the roll off roll on affect, often the snorkel is designed to improve the power delivery when riding in real world conditions as opposed to straight power runs.
Unfortunately for us, simulating "real world" wasn't possible on the day. It's something that we could go back and test, but the biggest problems with doing that on a R7 is how the airbox is designed, and repeatability. I'd expect the results to be pretty similar as the hole in the airbox lid size is still the same, so the amount of air that can get through to the filter is similar. Being able to repeat the same roll on/off would be simple on a ride by wire throttle, unfortunately it's not as easy for the R7, so we wouldn't have reliable results from that.
@@BB22Racing it can get rather involved .. old skool seat of the pants stuff & bikes side by side down the straights
i have moded my snorkal bna have it going into the air filter i have mine about two inches out with a trumpit on, i have been resurching on line and found a air box engineer who trained with race cars all his life. he has a xsr700 and dna filter but did not buy the dna top as he says the sound waves dont work as good as a trumpet funnel.. he whent into great detail about it. i made my own before seeing his post. i am going on the dino next week . we will see if he is right or not. i am not botherd about hp i want more torque up to about 8000 rpms as i have a T7.
Sounds like a great idea to play around with, let me know how it goes! I'm interested to see the comparisons between the stock, DNA and trumpet lid.
Hi man do you have a syringe damper on your yamaha r7 and if you do what kind and how do you install it do you have a videowith you install it
Staring damper
I don't have one on there at the moment, my install would be different to the stock bike though because I have the Robem front fairing stay. I'll ask some people and see if I can find a bike that I can play with.
So can I just run the dna stage 2 cap and my stock filter?
Yes, this will work, but again as shown from the dyno results, there will not be a huge top end power increase, but you should feel a bit more in the middle of the rev range, which is where most of us ride on the road.
Pod filters 🤙
Pod filters, with the correct runner lengths and velocity stacks! Just putting plain pop filters straight onto the throttle bodies ain't the best!
Does the HO have a less restricted snorkel than the LAMS model?
No, the HO and LAMS model snorkels are the same part number.
Does any of this cause a lean condition? I have a dna filter w dna lid and have been told i need to adjust afr cuz ittll lean out
It will provide more air to the engine, but you're not talking about silly amounts that will cause catastrophic changes to your air/fuel mixture.
@@BB22Racing also forgot to mention full Yoshi exhaust. As well as the filter and stage 2 lid. I had bought it like that but am thinking about putting the stock one back on cuz it seems the guy who had it before didn't rly know what he was doing and j slapping stuff on there.
So do you recomend removing the snorkle or no? I've got a new CF moto 450ss and it has a VERY similar snorkle. I just installed a DNA filter on it and im trying to decide if I should keep the snorkle or get rid of it.
I'm really not too sure about the CF Moto. For the R7 it's not really something that you NEED to do until you're trying to push a heap of extra power out of the bike, and even then it's not really going to give you much in the way of power. So for most road bikes, no, I don't think it's necessary. Probably best to check with some other people that have done specific tests (dyno results preferably) on the 450ss.
@@BB22Racing that's the problem. There's almost zero information available on the 450. No Dyno tests as far as I'm aware. The snorkel on it is almost identical to the one in this video. So this is the closest thing I've found.
@@SenateKT-uc2id Ah, I see, if I come across one I can test on a dyno I'll pull the snorkel and compare it for you!
@@BB22Racing That would be awesome!
I removed my snorkel and but left the lid before I even found this video and it seemed to have net positive effect on performance for the street to me, especially between 4 to 8k rpm...it also seemed to hit less of a wall at 8 k rpm, climbing revs to 9 k more enthusiastically...but I could be imagining it 😂
Hello I just did this to my mt07 but didn’t tune it, would it hurt my bike?
It shouldn't do anything negative to the bike
Just get a DNA filter with stage 2 lid
We tested one in the video have a look at the dyno chart at @ 3:01 it does make almost 10% more power at 5500rpm, but you also lose a bit up the top.
Thumbnail gets 11/10