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New Tomei Cams, Power FC calibration

The Alchemist
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The Alchemist Collaborator

The Alchemist

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Hi there. I have just finished installing some Tomei 260/260 9.2mm

lift cams in my R32 GTR and started her up today to run in the cam.

We did it in 2 by 10 min bursts and then let it settle down to idle.

IDLE? That didn't go to well.

The car is running a Apexi power FC with the Datalogit software.

It idled at 800rpm and very rough and sat in load zone "5".

Always idled at 1000rpm in the past on the old cams and in load

zone "2" flickering to "3" sometimes.

Obviously the engine is pumping more air at the same revs because of

the cams hence the greater load signal. AFM1 read 1.1V and AFM2

reads 1.4v at 800rpm. On the old cams I had 0.75v and 1v.

(The reason the two differ at idle only is that I still run the

standard breather system which makes one of the 2 meters reads

slightly higher than the other. Only at idle though, they read

almost the same once over 2000rpm)'

Anyways, you can just here it coming can't you :D

HOW do I recalibrate the airflow curve or voltage signal to get it

back down to zone 2 at idle....SAFELY. ie: THE PROPER WAY TO DO IT?

I'm running the std R32 AFM's.

Do I .....

1: rescale the 8 point scale, currently all set at the factory 100%,

to pull down the voltage at idle eg: where it says 0.64v and 1.28v

rescale these only to say 80 or 70% until I reach zone 2

2: rescale the actual a/f curve..how or what by I wouldn't have a

clue

any help would be great..

cheers Mike :D

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