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4.2 V8 32v Naturally Aspirated - 414 bhp
Grazer_skredge
1st Gear
Posts: 66
Joined: Thu Sep 10, 2009 4:36 pm

RE: Re: RE: Only 255whp - I have a problem.

Post by Grazer_skredge » Sat Oct 31, 2009 12:17 pm

Couple of thoughts....

AFR - I dont think thats rich - mine shows around 12.5 afr on our dyno dynamics dyno. industry thinking is that an AFR of 12.5 is the best to achieve maximum power, so if anything its a tiny bit lean (but this could be just the wideband lambda sensor not being entirely accurate) I seriously doubt that you would see any performance impact in fueling changing from anything from AFR of 11.5 to 13. In fact theres a pdf I have somewhere giving the results of scientific tests carried out years back on AFR rates and performance and they found little gains.

AIT - (air intake temps) - these should be matched to the dynos reading using Vag Com / VCDS - see what its showing first (measuring block 21 i think off the top of my head) then adjust the position of the dyno dynamics AIT sensor to suit. A dyno showing an AIT that is miles away from the actual intake temp shown in VCDS would give incorrect results.

What gear was the car run in and what setting on the dyno (shoot 44 probably)?

Hows the fuel in your part of the world? Is 99 available or is it much lower RON (resulting in lower figures)

GS

2manytoys
2nd Gear
Posts: 227
Joined: Sun Feb 22, 2009 7:54 am
Location: Australia

RE: Re: RE: Only 255whp - I have a problem.

Post by 2manytoys » Sat Oct 31, 2009 8:41 pm

Premium Fuel RON is 98 here in Australia. The Dyno run was done in 3rd Gear and the intake temp was 25C during the run. Oh, Oil temp was 80C when I handed the car to the operator and 105 when it was taken back off (about 3 full runs were done, along with a warm up/adjustment at the start).

Mal.

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