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Old 07-17-2013, 09:43 PM   #1
pdiddy
 
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want to learn about fuel pressure??

So I have recently when FI with the maggie made 540 rwhp at 5lbs of boost my question is when my car was dyno tuned would my tunner be able to see the fuel pressure as he tuned at idle and wot and tune accordingly with his software, I have attached my dyno sheet which shows air fuel but I am not sure if this some how depics fuel pressure please school me on this I just want to understand if and how my fuel pressure would have been determined safe.
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2011 2SS JBA LONG TUBE, JBA HIGH FLOW CATS AND 3" EXHAUST, CAI CAI, 3.91 GEARS NITTO NT555R, BRM TRAILING ARMS, AND BUSHINGS, DYNO TUNED AT 408 RWHP/ ADDED A MAGGIE WITH 3.6 PULLEY ZL1 PUMP ADM FPCM DYNO TUNED AT ??? RWHP AND ??? RWTQ NEW TUNE COMING SOON
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Old 07-17-2013, 09:56 PM   #2
Matt @ FSP
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Please post a better picture of the graph.. NORMALLY that red dotted reference line is DEFAULTED on a Dynojet to 13.0:1... if that is still the default (Can be changed in Winpep) you have bigger problems than figuring out what your FP is..

And yes, you can log FP on any FPCM GM car (Oh and also on Ford FPCM's too fyi).
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Old 07-17-2013, 10:02 PM   #3
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another pic

see the pic above and then explain what u mean to me maybe this pic will make sense I was being told the AFR was good just trying to understand how that and fuel pressure relate
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2011 2SS JBA LONG TUBE, JBA HIGH FLOW CATS AND 3" EXHAUST, CAI CAI, 3.91 GEARS NITTO NT555R, BRM TRAILING ARMS, AND BUSHINGS, DYNO TUNED AT 408 RWHP/ ADDED A MAGGIE WITH 3.6 PULLEY ZL1 PUMP ADM FPCM DYNO TUNED AT ??? RWHP AND ??? RWTQ NEW TUNE COMING SOON
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Old 07-17-2013, 10:34 PM   #4
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So maybe a better question is if my fuel system was not providing enough fuel/fuel pressure would this dyno sheet reflect it I hear people talk psi all the time just want to understand its relation to this and how to determine u have safe fuel pressure
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Old 07-17-2013, 10:36 PM   #5
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Ok well it's good to see that the reference line is a bit under 12.0, so that is good to see.. I usually aim for mid 11's on this boost level and 93 E10 pump.

You cannot tell your Fuel Pressure by looking at your AFR... Of course they relate because if the fuel pressure is dropping and cannot provide enough fuel it would be going lean. You would need the EFILive , HPT, CMR, SCT log to see the actual FPR, OR install a mechanical gauge on the end of the rail.
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Old 07-17-2013, 11:13 PM   #6
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At 5lbs of boost you shouldn't need fuel system upgrades, and if you did, your tuner would have been all over it.
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Old 07-18-2013, 06:25 AM   #7
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Good info thanks I didn't expect to need any upgrades I was just curious for future upgrades when I decide to pulley down how I would determine what my fuel was doing
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Old 07-18-2013, 07:44 AM   #8
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Quote:
Originally Posted by pdiddy View Post
Good info thanks I didn't expect to need any upgrades I was just curious for future upgrades when I decide to pulley down how I would determine what my fuel was doing
The dyno will show it clear as day, Very easy to spot and believe me your tuner is in the business of selling parts and labor. Enjoy your new supercharger, go beat up a ricer.
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