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10-28-2008, 08:39 AM
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#1
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10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
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new fuel pump, retuning required??
I changed from an edelbrock inline fuel pump http://store.summitracing.com/partde...5&autoview=sku and my fuel pressure was at 50psi at the rail. I changed to a Aeromtovie 700hp efi pump http://store.summitracing.com/partde...5&autoview=sku and it was 60 psi at the rail so i turned my regulator back to where it read 50 psi at the rail. Is this normal for putting in larger fuel pump with the larger volume, etc? Will i need to do any tuning on the car after this change or not?
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10-28-2008, 12:09 PM
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#2
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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I won't think any retuning would be needed. Even if you have slightly higher fuel pressure the ECM will read this and shorten the injector pulse to compensate. Might take a few miles of driving before the CEL reflexs the change. The only time you really have issues with high fuel pressure is trying to get a good idle as the ECM can have difficulty managing large (50+ LB ) injectors and high fuel pressures as it only uses 1 cell for cold idle operation.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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10-28-2008, 12:19 PM
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#3
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10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
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this isnt a factory efi it is FAST XFI
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10-28-2008, 12:25 PM
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#4
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,151
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I would think the theory sliderule laid out holds true regardles of system.
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10-28-2008, 12:33 PM
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#5
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10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
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so you mean bonzo i shouldnt have to retune correct?
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10-28-2008, 02:21 PM
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#6
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Keyboard Tough Guy
Join Date: Jul 2004
Location: Trenton, NJ
Posts: 6,341
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Since your main concern is fuel I would at least verify your fueling hasn't changed since the last tune throughout the powerband. Considering wideband setups start at around $200 its cheap insurance.
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11-02-2008, 06:24 PM
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#7
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10 Second Club
Join Date: Aug 2005
Location: lake hopatcong
Posts: 331
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anytime u change a fuel pump, even with the same kind, u should check and or re-set ur pressure.
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11-03-2008, 02:27 PM
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#8
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10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
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pressure is reset and i data logg'd the car for a half hr with the XFI, all is good, nothing changed . Here we come 225 and 250 shots!!! hehe
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11-04-2008, 08:15 PM
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#9
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12 Second Club
Join Date: May 2005
Location: Bucks County, Pa.
Posts: 78
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Joe... you better have that all straighten out and running right for the 17th. No excuses on the motor-to-motor run.
lmao --ron
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97 Black Trans Am:
GM847 | Yank SS3600 | MAC Headers | bunch of SLP stuff | some Projectz28 mods | beer
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11-04-2008, 09:38 PM
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#10
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10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
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ron let me just say she is running good on motor, it will prob be dead even with you and I. I need to call you so we get get some plans down for meeting times, etc.
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