PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Adding PE = No Effect

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Old Oct 14, 2005 | 10:14 AM
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Default Adding PE = No Effect

Was on the dyno checking AFR. At 4000 it was 12:1 so added 5% to the PE table @ 4000. No change in AFR. Then added another 10% then 15%. Still no change. Everywhere else I had no problem changing the AFR.

What am I missing?
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Old Oct 14, 2005 | 10:19 AM
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adding to would make it richer
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Old Oct 14, 2005 | 10:21 AM
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Ed,

What are you PE enable setting (MAP, TPS%, RPM delay)? Was this a WOT dyno pass and what kind of dyno?
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Old Oct 14, 2005 | 10:26 AM
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TPS is 26%, RPM delay is default (and I understand it has no effect). MAP is also default. It must be going into PE, otherwise why would go to 12:1?? Didn't have the problem on the last engine.

WOT pass on a Dyno Dynamics and DynoJet

And yes I do want it richer.

Last edited by Ed Blown Vert; Oct 14, 2005 at 10:31 AM.
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Old Oct 14, 2005 | 10:28 AM
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What injectors are you running and how much power are you making?
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Old Oct 14, 2005 | 10:28 AM
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Mototron 60#
Numbers in sig
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Old Oct 14, 2005 | 10:29 AM
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maybe check OLFA tables
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Old Oct 14, 2005 | 10:32 AM
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What about fuel pressure? vac/boost referenced regulator? Did you log the inj duty cycle?

Never seen this problem before unless the injectors are maxed, but it really doesn't sound like they would be on your setup.
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Old Oct 14, 2005 | 10:36 AM
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Add some fuel via the VE table..........
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Old Oct 14, 2005 | 10:38 AM
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Originally Posted by NicD
What about fuel pressure? vac/boost referenced regulator? Did you log the inj duty cycle?

Never seen this problem before unless the injectors are maxed, but it really doesn't sound like they would be on your setup.
FP started @ 60# and dropped to 50# (Ractronix FP). Injector DC was if I remember correctly 75% @ 6500. No referenced regulator

I know they are not maxed out, didn't have a problem dropping the AFR @ 6300 from 12:1 to 11:1
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Old Oct 14, 2005 | 10:41 AM
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why not logged commanded afr to see if its at least attempting to go richer
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Old Oct 14, 2005 | 10:42 AM
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What is your enrichment rate set at? That has a big impact as to how quickly it ramps into the extra fuel...max rate is 4.0 (where mine is).
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Old Oct 14, 2005 | 10:43 AM
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Next time I am on the dyno, I'll check commaned. I didn't touch enrichment rate.
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Old Oct 14, 2005 | 10:47 AM
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what were your iat's
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Old Oct 14, 2005 | 10:49 AM
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I'll have to check the EFI log, but I think around 100
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Old Oct 14, 2005 | 10:53 AM
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This is why I told ya to get a better fuel setup. Or at least a FPR with return at the rails.
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Old Oct 14, 2005 | 10:53 AM
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Celsius or fahrenheit
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Old Oct 14, 2005 | 10:54 AM
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I don't have my software with me to check, but for some reason I *think* I recall seeing a parameter that limits max enrichment. I could be talking out of my *** too.
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Old Oct 14, 2005 | 10:55 AM
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Originally Posted by JMBLOWNWS6
This is why I told ya to get a better fuel setup. Or at least a FPR with return at the rails.
I only have this issue @ 4000 rpms. Everywhere else I can change the AFR.
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Old Oct 14, 2005 | 10:55 AM
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Originally Posted by HumpinSS
Celsius or Fahrenheit
Fahrenheit
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