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In response to Guys idea in yet another chip tuning thread, here's one on exhaust EGT's in turbo cars.
The reason for this is when a car is "chipped", usually the boost pressure is raised. This usually results in higher Exhaust Gas Temps ( EGT's ) and this is a real concern for keeping your turbo intact. Too much heat is a sure fire way to blow your turbo.
First up a petrol car runs higher EGT's than a diesel, thanks to higher combustion temps kindly suplied by your spark plug and richer fuel to air mixtures. A petrol car typically goes from rich ( too much fuel ) to towards optimal, whereas a diesel goes from lean ( too much air ) to towards optimal.
We all have the same problem in a turbo car, and that is a ceiling on how much heat the turbo will handle. Especially a VNT variable vane non water cooled type.
You can measure your EGT's in Vag com, I'm unsure of the exact block, but I found mine on channel 74 in the real time measuring under 01-engine in "select control modue". I'm sure it shows up in several spots, I'm still working out Vag com. You can find a suitable, out of the way, private test road, preferably a long steep hill, and log the EGT's etc in real time on a laptop. You can then download the data into excel and produce a plot and find some max EGT's ( and other things ) in your car as it stands. It's not super easy, and takes some fiddling, but I'm sure you can work it out.
In my stock ECU GT TDI I have thus far observed a max of 819 degrees. This flies in the face of diesel guru's from the USA, who recommend a 700 odd max for their monster SUV diesels. Probably OK for the odd peak, and you REALLY have to thrash the TDI to get there, but it's still higher than I would have imagined. At idle the diesel is a tiny 160 degrees odd, but normal driving shows 400 plus pretty easily. DPF regen happens at 600 according to the manuals.
The GTI / TSFI / TSI etc is going to run higher max EGT's, but the stock turbo is water cooled to counter this. Of that fact I'm jealous!
Remember some people run turbo beanies or covers to keep the heat radiated from the exhaust side of the turbo out of their engine bay ( and thus air intake ) but this also keeps heat IN the turbine outlet, and keeps EGT's high.
Be interested for anyone with real figures and ideas to add them, regardless of car. You R32 types can keep quiet thanks very much, this is turbo talk YO.
In response to Guys idea in yet another chip tuning thread, here's one on exhaust EGT's in turbo cars.
The reason for this is when a car is "chipped", usually the boost pressure is raised. This usually results in higher Exhaust Gas Temps ( EGT's ) and this is a real concern for keeping your turbo intact. Too much heat is a sure fire way to blow your turbo.
First up a petrol car runs higher EGT's than a diesel, thanks to higher combustion temps kindly suplied by your spark plug and richer fuel to air mixtures. A petrol car typically goes from rich ( too much fuel ) to towards optimal, whereas a diesel goes from lean ( too much air ) to towards optimal.
We all have the same problem in a turbo car, and that is a ceiling on how much heat the turbo will handle. Especially a VNT variable vane non water cooled type.
You can measure your EGT's in Vag com, I'm unsure of the exact block, but I found mine on channel 74 in the real time measuring under 01-engine in "select control modue". I'm sure it shows up in several spots, I'm still working out Vag com. You can find a suitable, out of the way, private test road, preferably a long steep hill, and log the EGT's etc in real time on a laptop. You can then download the data into excel and produce a plot and find some max EGT's ( and other things ) in your car as it stands. It's not super easy, and takes some fiddling, but I'm sure you can work it out.
In my stock ECU GT TDI I have thus far observed a max of 819 degrees. This flies in the face of diesel guru's from the USA, who recommend a 700 odd max for their monster SUV diesels. Probably OK for the odd peak, and you REALLY have to thrash the TDI to get there, but it's still higher than I would have imagined. At idle the diesel is a tiny 160 degrees odd, but normal driving shows 400 plus pretty easily. DPF regen happens at 600 according to the manuals.
The GTI / TSFI / TSI etc is going to run higher max EGT's, but the stock turbo is water cooled to counter this. Of that fact I'm jealous!
Remember some people run turbo beanies or covers to keep the heat radiated from the exhaust side of the turbo out of their engine bay ( and thus air intake ) but this also keeps heat IN the turbine outlet, and keeps EGT's high.
Be interested for anyone with real figures and ideas to add them, regardless of car. You R32 types can keep quiet thanks very much, this is turbo talk YO.
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