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04-18-2018, 07:50 AM
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#1 |
 Drives: Victory Red Join Date: Jul 2017
Location: MD
Posts: 175
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Dsx aux fuel pump Kit fuel pressure
So I have the dsx kit installed and tuned for E85. Yesterday while roll racing a friend, I still see my fuel pressure at the rails through my aeroforce gauge drop down to 43psi at wot. Why would this be?
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04-18-2018, 07:58 AM
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#2 |
 Drives: 2019 Corvette ZR1 Join Date: May 2017
Location: St. Louis, MO
Posts: 313
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Use something other than the Aeroforce to check pressure. I've seen many instances of the Aeroforce reporting pressure incorrectly when it's high.
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04-18-2018, 09:47 AM
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#3 | |
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Drives: Victory Red Join Date: Jul 2017
Location: MD
Posts: 175
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Quote:
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04-18-2018, 02:34 PM
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#4 | |
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Drives: 2014 1LE, 1996 z28 Join Date: May 2015
Location: United States
Posts: 172
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Quote:
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04-19-2018, 12:03 AM
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#5 |
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Are you using the stock SS FPCM tune? If so it’s doing exactly what it’s told and dropping pressure higher rpm’s.
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07-23-2020, 08:32 AM
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#6 |
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Drives: 2013 camaro ss 1le supercharged Join Date: Apr 2016
Location: bettendorf, ia
Posts: 122
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I AM HAVING THE SAME ISSUE I HAVE THE DSX FUEL KIT ITS TUNED FOR 93 OCTANE AND 385 AND ON THROTTLE ABOUT MID RPMS IT DROPS FUEL PRESSURE AND CREATES A MISFIRE
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07-24-2020, 08:22 AM
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#7 |
 Drives: white zl1 Join Date: Nov 2018
Location: spring tx
Posts: 19
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double check the connection at the map sensor! it wasnt a good enough connection on mine and when i would wiggle it and watch it on hp tuners it would jump all over the place without the car even running! i gently bent the pins inside the connector and plugged it back in and never had another problem!!
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07-24-2020, 11:12 AM
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#8 |
    
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If you have the ability to log data, that will tell you what is going on. You can watch fuel pressure in real time, as well as MAP data to see if you are getting erratic data there. I'm inclined to agree with the others that your most likely culprit is an improperly tuned/adjusted FPCM.
Let us know what you find. -Scott
__________________
745RWHP/634RWTQ on 93 @ 10psi
806/676 on E85 @ 10psi  COTW 9/8/14 |
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07-25-2020, 01:52 AM
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#9 |
 Drives: 2012 ZL1 Join Date: Mar 2020
Location: Oklahoma City
Posts: 66
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Also, if you're a zl1, make sure to put it on the rear sensor on the lid. Otherwise jump the pump manually and make sure it works at all. I've found that unless you're moving a ton of air, the pump will move enough fuel that the fpcm can't slow down the in tank pump enough to drop pressure to requested, so if you're dropping to 40's and requested is anything higher, then the aux pump probably isn't turning on. Sorry if this doesn't make sense, it's late and I got an early start today.
__________________
'12 ZL1 - RPM 5", TSP 2" headers, Speed Engineering 3" header back, Dayco 8.66 lower/LPE 2.38 upper with solid isolator and 10 bolt hub, hand ported blower and snout and went way too far, ID1050x's, DSX aux harness with a summit 400lph pump on E, NGK TR8's with Taylor wires, 160* tstat, NW 102, UPR catch cans, HP Tuners, Stock unopened long block
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07-25-2020, 05:22 AM
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#10 |
       
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,018
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Aeroforce reads what the computer reads.
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07-27-2020, 12:14 AM
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#11 |
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Sounds like you need to tune the FPCM. Think I had my setup set to 450KPA (65psi) all the time. Stock SS is 58 And set to drop pressure as the RPMs go up. Do not know why GM did it.
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