first here's my mod as i post in the dyno thread

tuned on crome
spoon drop in filter
Rage header
no cat
T1R b pipe
spoon N1 muffler
fidanza flywheel
everything else is stock
it dyno in a very hot day



question is why I need my AF so rich? we try to learn it out around 13.5 but it losing power. my AF need to keep all the way around 13 and need to be 12.8 after 7k rpm.
anyone had suggestions?? or it need to be run like rich?? i have no idea....

 

Must be the header?

 

that's what we thought too. but i still see ppl running hytech with cams and others. 12.x-13 AF is what they need.

 

Looks like it's running too rich. How does it run at partial throttle?

 

I think the A/F ratio is were it should be. At leats from the info I have below, but maybe who has a similar set up from yours can comment on that:

"A naturally aspirated engine should run an air/fuel ratio of around 12 - 13:1 at peak torque. The exact air/fuel ratio can be determined by dyno testing, with the ratio selected on the basis of the one that gives best torque. In the engine operating range from peak torque to peak power, a naturally aspirated engine should be slightly leaner at about 13:1"

From your A/F graph you are basically inside the 12 - 13:1 range, and also it leans out progessively.

 

is it the rage big tube or standard size?

 

it's the standard size header

partial throtte is smooth, everything went smooth. i think the AF need to be like that.