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Hi all,

Suffered a very strange issue on Sunday at a Supersprint.

Basically going WOT 100kpa and after 6500rpm my AFR would go from 12.8:1 to as low as 10.5:1.

If i back off to say 85% throttle it appears to come back in spec.

I have not noticed this happening before.

I am running a Adaptronic and those guys are having difficulty figuring it out also.

I have a small log of the event happening but it shows all to be normal besides the AFR drop.



I have a theory but not sure if it is even plausible.

Could my Fuel Pressure Regulator be failing and causing too high of a pressure at that point??

Do they even work that way?

I do not know how the RPM part would affect this unless potentially i am reaching a higher MAP after 6500rpm somwhow??

Any help much appreciated! !!




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Have you posted your issue to the Adaptronic forum? If not, I'd suggest doing so. I always get responses, sometimes from Andy Wyatt himself (owner/creator of Adaptronic).

Thanks.
Yeah i have.
Alos contacted Adaptronic.

Both are confused as to what the issue could be from.

I am going to switch to another rail and Reg to see if that helps.

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I had a similar but different issue with my car last year whereby the wiring to the tps sensor had partially broken inside the connections.
So visual inspection showed nothing but car would randomly show freaky values on the TPS and the adaptronic would then apply the relevant fueling corresponding to this TPS value.
At best a pita when the TPS read more than it should, but downright dangerous when it showed much less and adaptronic pulled heaps of fuel thinking I had lifted off when in fact my foot was still buried in the firewell. AFRs of 22 aren't fun at WOT on track..

Took me a few meetings to sort it out, but finally managed to reproduce it idling in the shed by watching/logging the outputs and wiggling the wiring around till the problem showed its head.

May be completely irrelevant for you, but worth trying/checking anyway.

Thanks Rascal.
Yeah i thought TPS but the logs look ok?
Also i don't know how it would go richer.

I think it might be a injector issue or fuel pressure regualtor.

The car is going to vist MRC tomorrow as i have heard good things about them so hopefully it is all sorted in time for Phillip Island in 2 weeks time.

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