Boosting safely
#1
Boosting safely
So say I turn up my boost with a mbc, I would want to keep an eye on my air/fuel ratios, timing pull, and maybe misfire count with vag-com right? What should the air fuel ratios be under boost? I know 14.7/1 is right for a NA car but does the engine need extra fuel for cooling? Also is there an acceptable amount of misfires or are any an indication of problems?
#2
RE: Boosting safely
you should have 0 misfires. If you have any, you have something wrong. On a stock turbo, ~13:1 is about the norm for the a/f under boost. With a larger turbo, 12.5:1 is the leanest you should go with 11:1 being richer and safer. Best to keep it at 12:1 with a bigger turbo. You wont harm anything running it 13:1 like they do with a stock turbo.
If you have a AWP or BEA engine code, you can use vagcom to watch a/f, but if you dont, its worthless since the other engine codes have narrowband o2's and not that accurate.
If you have a AWP or BEA engine code, you can use vagcom to watch a/f, but if you dont, its worthless since the other engine codes have narrowband o2's and not that accurate.
#4
RE: Boosting safely
going to run the diode. I think the engine code is AMU. Thats a narrowband? Would a aftermarket wideband be the only way to know if things were safe or is there another function in vag-com that can be used?