Thread: VF570 installed
View Single Post
      12-15-2012, 09:36 AM   #82
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

Quote:
Originally Posted by pokeybritches View Post
Not necessarily. My father burned up an engine about a year ago because it leaned out at high rpm... culprit was the fuel pump not keeping up with the demand. There was no check engine light.

As you increase boost you also increase the need for more pressure to pump the fuel, because the pump must fight against higher pressure in the cylinder. Granted this is not a turbo car and we're only looking at 8-9 psi, it definitely doesn't help the pump out. At 9 psi, the pump will have to create 9 psi more than on a NA motor to achieve the same pressure delta between the pump and cylinder.

Leaning a mixture out is dangerous. Most tuners want no more than 12:1 at full throttle, because detonation at high rpm can be catastrophic. The extra fuel also serves to cool the mixture.

Rated, I wouldn't run your car above 6500 rpm until you confirm that it's an inaccurate sensor. I would definitely install a wideband as soon as possible.

this is perfectly said imo....... absolute truth here, this is why i love having the AFR in the car, do you guys remember fr8tdog, his gauge suddenly went into the 12s @ WOT high revs, his pump was letting on his higher milege car...

great comment here pokey. Det is not nice......
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0