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I spoke to a couple of tuners..... (archive)

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Posted by Cheuk in Seoul on October 29, 2000 at 21:08:49:

In Reply to: Re: Fuel pressure regulator... posted by Shawn Fogg on October 29, 2000 at 20:27:57:

The guys at RC engineering and Active Autowerkes both recommended and stated that stocker are 24# and that 26# are good to go without messing with the stock fuel curves too much at idle and cruising. I expect to have worsened fuel economy and expect the DME to adapt out fuel during idle and part throttle.

But I believe that the WOT maps are not 02 sensor driven and only based on the original fuel maps + or - a little "global" adaptation.... I think that this is the situation. On OBD1, WOT was based solely on 02 sensor readings. Worse comes to worse, I will reset to original maps every week. Also I will run the car on the dyno every week after the injectors to see if there really is a measurable amount of adaptation.

I ran the car on the dyno and as AA expected... I was lean... for a turbo at 14-13:1. Actually a little scary. I want to get the mixture down a little.

My boost sensitive fuel regulator is not adding enough pressure. I have considered going to a BEGI adjustable boost regulator but i want to try the injectors. I think that I would be reaching the maximum of the fuel pressure and the fuel pump with me now running 8 psi.

Somebody has to experiment. :^)

The guys at AA says that they are now almost ready to offer a turbo for the OBD2. (Their previous systems were OBD2 to OBD1 conversion) I think either they or Jim C finally cracked the adaptation problem.

Cheuk... in search of 300 RWHP



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