Mitsubishi Pajero wastegate / VGT control - 3 CAMERAS!! Mitsubishi Pajero / Shogun / Montero
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- เผยแพร่เมื่อ 6 ก.ย. 2024
- The turbo wastegate, or the vanes on a Variable Geometry Turbo, is/are controlled by the ECU (Engine Control Unit) on modern turbocharged vehicles, which means it behaves very differently to a traditional boost-controlled wastegate. In this video we sync up three separate cameras to monitor wastegate / VGT behaviour, throttle inputs and dash gauges, to see how an ECU-controlled wastegate / VGT operates under a range of driving conditions.
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The vanes on a VGT turbo are let's say closed at low rpm to increase exhaust gas velocity and make boost but are then opened as rpm increases to allow exhaust gas to flow and not restrict the engine. Now with a diesel engine it's fuel that makes power, not boost. The VGT control is not really used to make power but to control exhaust emissions by keeping the air fuel ratio correct and prevent soot or excessive exhaust smoke.
You could be right, I'm not a diesel expert. However more air should equal higher compression pressures in the combustion chamber, which should equate to more power. I could be wrong though.
Brilliant insight. Thanks Greg
No problems mate, glad it was helpful!
I'm curious on where you connected you turbo gauge vaccine line. Are you able to help me? I would be greatly appreciated. I have NT Gen 4 2010 3.2 Pajero. And I bought a analogue turbo gauge with all the lines and sensor. I'm just not sure where to splice into. Cheers.
Sure mate. Standing in front of the engine, on the right side of the engine back at the firewall you'll see the fuel filter. There's a blue plastic connector mounted to the fuel filter bracket and that connects to the MAP sensor. Underneath the MAP sensor there's a black rubber hose which runs into the manifold, and that hose is the one you need to cut and insert a t-piece for the boost gauge.
You may get fluctuation of the needle on the gauge. If so get a long screw that fits snugly into the vacuum line going to your gauge (on the gauge side of the t-piece, not directly in the line going to the MAP sensor), cut off the head and push that down the hose a bit. The extra resistance that creates will dampen out the needle fluctuations. It'll respond slightly slower but is much easier to read.
Also since diesel engines don't normally produce vacuum, you can just get one which only has boost, not boost and vacuum like I did. I was still in my VL Turbo mindset from 20 years ago when I bought this one!
PS There's a lot of vaccines around these days but not if there's one for low boost... ;) Maybe you mean vacuum line :D
@@TheMusingGreg thank you very much for your help, I really appreciate it. I had a VK V8 too... I miss that thing.
Ha my mate had a white/Silver VK V8 Calais, and my VL was the same colour scheme. I've got a photo of them nose to nose, it's a great shot!
I might be wrong but I didn’t believe they had waste gates on the gen 4. I thought it was controlling inlet guide vanes to the turbine? That explains why it ‘opens’ as soon as it starts and even under light load. Because it’s not opening it’s just adjusting the inlet guide vanes to the turbine to start it spinning.
Well that's interesting, that's a new one for me! You could be right. That being the case, it's still interesting that the vanes are in an 'in between' state under heavy acceleration when you'd think it would be demanding maximum output from the turbo.
@@TheMusingGreg I think it opens vanes initially to spool up quick and develop boost but then throttles it back to limit boost at heavy load/RPM in the same way that a waste gate waste gases to bypass the turbine. Think of it as Porsche tech in a Paj!
Makes sense Mike. I guess whether it's a wastegate or a variable-geometry turbo, the end result is still the same that the ECU's controlling the boost. And that being the case, I'm still puzzled why the ECU would let the boost wind back by keeping the , rather than open them up more to provide consistent boost as engine RPM increases.
@@TheMusingGreg I think it does that to limit boost pressure as during high load and rpm the quantity of exhaust gases would spin the turbine at a rate that generates excess pressure. So this is throttling back those exhaust gases rather than dumping them via a waste gate.
@@mikewasowski1411 Maybe I wasn't clear. My musing here is not HOW it's controlling the boost (be it a wastegate or vane adjustment), but WHY the ECU is doing that - why not hold the boost at 16psi or whatever as the engine revs up to keep the power on, rather than winding the boost back as revs increase.
Hi can you put that turbo on a 4m40?
Unfortunately I don't have any experience at all with the 4M40, I have only had a 4M41 so take my guesses here with a big handful of salt... but I don't expect it would be practical to do so. I expect the position of the inlet and outlet of the turbo may be a bit different so physically it probably wouldn't fit, but the bigger issue would be whether the ECU for a 4M40 engine can control boost in the same way as it does on the 4M41. I would expect not, in which case even if you could get it to fit you'd have no way to control boost.
If you were really interested you'd need to do some deeper research with someone who knows a lot more about the specifics of the 4M40 setup. Sorry I can't be more helpful on this one.
@@TheMusingGreg thank you for your reply
No worries good luck!
Is not a waste gate. Is a variable geometry nozzle
Yep you're right, I realised this afterwards which is why I updated the title after I shot the video. Cheers!
I'm pretty sure that you don't have a waste gate on your car. I'm almost sure that you have a VNT instead...
That's possible. I'll have to check that out.
I want to know how that little lizard could stay still for the entire drive 😂
Haha he's very well behaved!