Ortoch

Hey everyone I just bought an 03' cobra with a 76mm Helion kit on it and it has some problems. I bought it knowing this and have most of them worked out and took her for a road test today and had a big problem. What is going on is that in every gear no matter if I punch it or gradually ease it up in RPM it always stops at 5200 RPMs and then bounces back and forth between 5200 and 5000 RPMs almost like there is a rev limiter.

We had it working yesterday and for the heck of me I cant figure out what might be the problem and the only thing that changed between now and then is that we were doing some burnouts in her testing out a local tracks wetbox so I am lookin for some help here.

It was shipped from Tennessee (1200ft above sea lvl) to Maryaland (100ft above sea lvl) so I am going to get her re-tuned but since she was running fine yesterday I am thinking it might be something that came loose, broke, or something of that sort.

If anyone has any ideas please let me know.

Thanks a mil,
James

Ortoch

Here is all the spec's on the car if it helps any of you tech junkies...

Intake:
Hellion T76 S-Trim Ceramic Ball Bearing Turbocharger with .96 a/r turbine
SCT 2800 BIG AIR MAF
Powdercoated Stock Throttle Body
MACH1 intake
Turbosmart Eboost2 Boost controller
Turbonetics Evolution wastegate
TurboXS BOV
Hellion Bar and plate intercooler

Exhaust:
Hellion 3" Stainless Downpipe
Hellion Stainless "Y" connector
SLP LM1 catback

Motor:
Motor built by HP performance in jacksonville fl
Keith Black pistons .030 over 8.5 to 1
Oliver Billet Rods
Valve job by ModularPerformance.com
Heads are bowl ported by ModularPerformance.com
Crower Stage3 cams #62824-4
Crower heavy Duty valve springs/retainers #84710
Canton Road Race 7qt Oil Pan #15-784
NGK-TR6 gapped @ "0.030
Energy Suspension polyurethane Motor Mounts

Fuel:
PHP return fuel system
Dual Weldon 310lph in-tank pumps
-8AN fuel line with Apten stainless adapter
Russell 40micron -8AN fuel filter
Weldon Fuel Pressure Regulator
Pauls Hi Performance MACH1 Fuel rails
60lb SD injectors w adapters.
-6AN Return line

Transmission:
T56 from RPM trannys with all cryogenic gears
Centerforce DFX Clutch
Centerforce Aluminum Flywheel
Centerforce TOB
Fiore F/W ADJ and quadrant
MGW T56 Shifter w/ red handle
Dynotech Engineering MMC Custom Driveshaft

Front Suspension:
UPR K Member
UPR A Arms
UPR Bumpsteer kit
Maximum Motorsports Coilovers 350#
Maximum Motorsports CC Plates

Rear Suspension:
DSS Level 5 Halfshafts w/larger outer hubs
Maximum Motorsports UCA/LCA/FRT&RR Diff Bushings
Maximum Motorsports IRS Subframe bushings #MMIRSU-1
14mm Front IRS bolts and nuts from MM
Stock Bilstein Shocks w/ MM bushings
Stock Height OEM Coupe springs
UMI Performance Torque Box reinforcements (fronts)
ABS wire pass-thru relocate
PHP Billet Toe Link Bars
Billetflow Rear Diff Cover Brace
31 spline Eaton posi differential
FRPP 3.55
Motorcraft Synthetic 75w140 Ford Friction modifier

Miscellaneous:
Autometer Fuel Pressure Gauge
Autometer Lunar Oil Pressure Gauge
Autometer Lunar Boost/Vac Gauge
Maximum Motorsports MMRB-9 6-pt cage w/swingouts
AFS 9" polished front wheels
AFS 10.5" polished rear wheels
SLP Line Lock
Stainless brake speedbleeders SB1010S-SS
Ford HD Brake Fluid 550degree
Metco Driveshaft Loop
Gorilla 1" open end Lugnuts #90087
Motorcraft Locking Gas Cap FC958 XU5Z-9030-DA
Battery Relocated to trunk
HANS Force Subframes
Custom Power Steering Reservoir Bracket

Hegotgame

I have no clue what could be wrong but nice car goodluck fixin it.

xxkazp3rxx

It sounds like it'seither your tune, fuel system or MAF.

Your car isn't getting enough fuel or enough air at those high rpms and the motor is pulling back to stop you from blowing it apart. Which means, it sounds like somethings wrong with your fuel system, your MAF maybe pegged/malfunctioning or it just may need a better tune.

Now something you might want to check that's easy... when my alternator was dieing it choked me in the upper rpms of my 03' cobra when I had it. Might want to check that as well

the_camo_snake

I had the same problem in my 96 Cobra. Although it is n/a I had it dyno tuned and it was running like crap warmed over on the dyno and had way low numbers. Im talking below stock and its got cams and various other mods. COme to find out the MAF was tuned wrong and was dirty so the tuner recalibrated the MAF and cleaned it and it ran like a champ.

jumperjack

If you can't hear anything or find any loose connections doubt that some thing broke I think getting it to the dyno ASAP is your best bet. Looking at your mods doesn't look as though you should be running out of fuel or air unless tune is off. How much boost were you running when it started dying out on you?

35thAnni99GT

I don't think it's fuel/MAF. That BA should take whatever you throw at it and the return style setup should be plenty of muscle. Pull your plugs and see what theyre gapped at and what they look like. Could be spark blowout.

mfj

CHECK THE GAP ON YOUR SPARK PLUGS!!!