[SOLVED] WOT fuel pressure loss during shifts

Marco Medina

Marco Medina

Greenie N00B Member
Hey all, I was hoping someone here could help me out with an issue I'm having and maybe someone else has experienced the same.
I have a 1st gen speed 3 with a built motor, Port injection with a AEM 340 fuel pump and ID1050s, ST manifold, CPE exhaust manifold, BNR S6, CS 4" intake, CS 3.5 turbo back, TR1045 IC, 3 port ebcs, and currently on my 5th revision on 30psi on pump 93.
During my 3rd to 4th gear shift I'm losing fuel pressure while doing a pull. It's weird because my AFR doesn't go lean but the car sputters and drops down to around 1200psi for a few seconds then jumps back up for the rest of the pull. I'll post a log for you guys to check out but I'm lost at this point because the only time it's dropping pressure like that is right after a shift into the gear while racing. Not sure if maybe the Split second controller map needs adjusting or the tune itself or if I have something else going on. Datalog 7 is the 3rd-4th gear log and datalog 8 is a WOT log in 4th
 

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Have you done a prv test? That's where I'd star that and check the ground near the hpfp is snug.
Template public:_media_site_embed_youtube not found. Try rebuilding or reinstalling the s9e/MediaSites add-on.
Curious question, who's tuning you? Probably unrelated, which map sensor and ebcs are you using? (Collecting data on the last 2)
 
Awafrican said:
Have you done a prv test? That's where I'd star that and check the ground near the hpfp is snug.
Template public:_media_site_embed_youtube not found. Try rebuilding or reinstalling the s9e/MediaSites add-on.
Curious question, who's tuning you? Probably unrelated, which map sensor and ebcs are you using? (Collecting data on the last 2)
Click to expand...
Yeah I did that test and it climbs slowly but I believe it does climb all the way to 1850. I only watched it till about 1200 before I got out of the car but I'll try watching it longer later. HPFP ground is good. Is there really 2 types of valves? I heard him say there's one that relieves pressure at 1850 and one at 2075
I'm running a 3.5 bar Corksport map and just a Mac 3 port boost controller
 
have you done any modifications to the in tank fuel pump or pump basket?
 
Easter Bunny said:
have you done any modifications to the in tank fuel pump or pump basket?
Click to expand...
Yes I replaced the stock fuel pump with an AEM 340. Maybe the way I did the o rings is wrong. Is it supposed to be the oem white sleeve + the 2 orings supplied?
 

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