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Old 05-03-2020, 08:47 PM   #1
Rons1le
 
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Fuel pressure drop under boost..

Is fuel pressure drop under boost normal? I video recorded a couple pulls the other night and as my boost got above 6lbs fuel pressure started dropping but wide band was normal.

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Old 05-03-2020, 09:32 PM   #2
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No. Thats a sign that you need more fuel pump. Afr didnt change because your inj duty cycle went through the roof to compensate. Running your injectors over 100% wont last long. Recommended you dont go past 80%.

What is your fuel system?
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Old 05-03-2020, 09:34 PM   #3
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The Fuel pump control module in the SS has fuel pressure set to 58, until your rpms rise, then its programmed to drop to 48. You can change the tune to demand 58 all the way, but most likely you’ll need more pump.
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Old 05-03-2020, 09:37 PM   #4
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ZL1 pump

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Old 05-03-2020, 09:39 PM   #5
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When I was tuned, wot and full boost injectors were only 40% duty cycle. But I do not know what the fuel pressure was.

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Old 05-03-2020, 10:40 PM   #6
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Zl1 pump with a programmed fpcm should be good to a little over 600whp. Has your fpcm been programmed or did you buy a pre programmed one like jannetty sells?
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Old 05-03-2020, 10:45 PM   #7
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My car come factory with a ZL1 fuel pump and whatever the tuner has done. And I was told 700whp was max on a ZL1 fuel pump on 93.

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Old 05-04-2020, 05:58 AM   #8
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Quote:
Originally Posted by Rons1le View Post
My car come factory with a ZL1 fuel pump and whatever the tuner has done. And I was told 700whp was max on a ZL1 fuel pump on 93.

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Not unless he at least installed a BAP. What's the fuel pressure dropping to? You don't want to see any fuel pressure drop.
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Old 05-04-2020, 07:07 AM   #9
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58 psi then drops to 50 psi

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Old 05-04-2020, 08:02 AM   #10
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Quote:
Originally Posted by Rons1le View Post
58 psi then drops to 50 psi

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Sounds like the FPCM was not tuned.
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Old 05-04-2020, 08:15 AM   #11
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Ok, how do I go about doing that?
Getting the fpcm tuned.

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Old 05-04-2020, 08:22 AM   #12
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Greenhornet2 thanks, Jannetty sells a pretuned one for $199 probably best and fastest option.

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Old 05-04-2020, 09:35 AM   #13
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Quote:
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Greenhornet2 thanks, Jannetty sells a pretuned one for $199 probably best and fastest option.

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Yes, that's what i used. You may want a new tuner they don't seem to know what they are doing too well.
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Old 05-04-2020, 09:40 AM   #14
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if you get an auxiliary pump, will your FCPM for the ZL1 pump still need to be adjusted?
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