C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Do I need a AFPR?

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Old Nov 9, 2003 | 05:19 PM
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9T3JIM's Avatar
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Default Do I need a AFPR?

Had a chance to dyno my 93 a couple of times the last month after a few mods and generally was pleased with the results. The first dyno was with a TPIS air filter, open lid, and a DRM prom and pulled 267rwhp. Yesterday, after installing a Corsa exhaust, it pulled 275rwhp. It was noted however, that my AF ratio was 11.5/1 each time. We think that leaning the fuel out will give us a few more ponies. Should I try an AFPR or should I send the prom back to DRM and have the fuel map changed?
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Old Nov 9, 2003 | 07:03 PM
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Default Re: Do I need a AFPR? (9T3JIM)

The advantage of the AFPR is that you can vary the fuel flow while on the dyno to nail it down.
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Old Nov 10, 2003 | 10:37 AM
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Default Re: Do I need a AFPR? (65Z01)

Can you tell us the Block Learn while at idle. The chip may be a little aggresive with the gas, the 02 sensor will correct. At WOT, the fuel pressure can be adjusted, in this case, downward.

Good luck with your tuning. Using a dyno is the smart way to go. No witchcraft.

dlmeyers 90 coupe zf6 3speed shocks
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Old Nov 10, 2003 | 06:14 PM
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Default Re: Do I need a AFPR? (dlmeyers)

Sorry can't tell you what the block learn is, but I did talk to someone at DRM today and they will adjust the fuel for me at no charge! Thanks for the tip on how to use the AFPR
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