06-19-2008, 03:33 PM
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Registered User
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03-04 Cobra Tuning Question
I have an 03 cobra and I do all the mods to my cars and friends cars. This is my second 03 cobra and I am having some tuning issues I believe. Just wandering if someone else has come across this issue
Mods: Diablo custom tune MAFia 2.76 pulley Accufab Big oval throttle body and plenum O/R xpipe magnaflow cat back built solid rear with 4.10's JLT CAI 3 motoblue idlers AEM wide band O2 gauge stock fuel system Car custom tuned and on a Dynojet put out 499.90 rwhp and 502 rwtq I put in a set off Ford GT pumps and had it retuned. The car did 468 rwhp and 486 rwtq, so it lost hp and trq. And now the car will pull fine (11.4-11.7 a/f) until about 5200 rpm then will go 10.1 a/f until redline. So I did some more research and found out that with Ford GT pumps you will need to upgrade to a modified FPDM ( fuel pump driver module ). So i ordered one from Lethal Performance and I still have the same issue. Lethal says I need a retune, which is very probable. But I wanted to check with others to see if they had the same problem. Also on another cobra I have been working on. It was custom tuned and made 486 rwhp and 496 rwtq. I put the ford GT pumps in it and had it retuned and it lost 20rwhp and 15 rwtq. I have not tried the modified FPDM on this car because we are getting ready to do a MMR 5.0 stroker, kennbell 2.8, and lethal performance triple fuel hat system on it.
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03 Cobra 11.85@119 with a 1.75 60 foot 86 GT Daily driver 04 F150 crewcab lowered Previous cars: Shit load www.ctmotorsports.net www.centraltexasperformance.com |
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06-19-2008, 10:27 PM
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Don't hate!
 
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Sounds like a stock injector issue, time to upgrade.
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Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts. |
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06-23-2008, 11:46 AM
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#3 | |
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Registered User
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Jason post it up on SVTP, there are a ton of moddified 03-04's
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 Past rides: 4 93 cobras, 96 cobra, 99 cobra, 03 cobra, 8 fox bodies, 3 94-95 gt's, 04 Lighting, SVT contour, 02 Saleen, 03 Mach 1, 02 GT, 65 Coupe |
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06-23-2008, 12:12 PM
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#4 |
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Registered User
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yea I probably will.
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03 Cobra 11.85@119 with a 1.75 60 foot 86 GT Daily driver 04 F150 crewcab lowered Previous cars: Shit load www.ctmotorsports.net www.centraltexasperformance.com |
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06-25-2008, 12:41 PM
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LSS Sponsor
 
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Dual Ford GT pumps is overkill on the car. A single Ford GT pump would've been fine for now. Check your fuel pressure. I bet you're having issues with fuel pressure. Lethal should have also had you buy the replacement Fuel Hat.
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39# Injectors At 80% Duty Cycle: 39 x .80 / .55 = 56.7hp 56.7 x 8 = 453.8hp 39# Injectors Max At: 39 / .55 = 71hp 71 x 8 = 568hp
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Jeramey Strictly Performance 713-910-0111 StrictlyPro.com Daily Driver - 08 FJ Cruiser 4x4 Weekend Car - 92 S-Trim Fox |
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