If you look at your first post you will see that your air mass is well below 500 mg/s but you are generating good boost. Now look at your second post and you will find that the air mass matches boost to the letter. If the figures were the other way around, eg high air mass and low boost you could be looking for an air leak on the boost side. ( I know that it could be caused by many other things as well) Regards
on November 23, 2012, 3:52 pm, in reply to "Re: Audi A4 TDI170 - lazy boost, black smoke"
Tony's pointed you in the right direction as to how I noted your issue.
You are totally right with your maths and I only use the equation as a quick first look tool, but allowing for temperature change and VE measurements you will find that it works very well.
2000cc 4 cylinder Diesel engine should show about 500 mg/s with no boost and EGR switched off.
Apply boost and use it as a multiplier to your base value.
500 mg/s times 1.5 bar boost = 750mg/s
Rpm does not of the come into the equation because
Of the type of measurement.
Mark
Modern cars, Its all wizardry and witchcraft
Message Thread | This response ↓ Audi A4 TDi 170 BRD 2006 - Lazy boost, black smoke - Fixed # - Craig Shiraz November 19, 2012, 4:27 pm
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