shelbyguy470 Posted August 30, 2010 Report Share Posted August 30, 2010 I have a 2007 SGT with the Shelby Paxton supercharger on it. I live at Lake Tahoe (6300ft) where there is no issue. When I was down at SAAC -35 @ < 150 ft. If I accelerated quickly the engine would crap out at about 5500 rpm. It would sound like it is running out of gas. If I accelerate slowly, I am fine until the rev limiter. I had been talking to Roger about the supercharger in general and I was told that all Paxtons have fuel issues and I need to spend another $1500.00 to have a GT 500 fuel pump installed. Is this an issue that would be caused by the fuel pump or is there something else I should check? It was great meeting all you folks there. Thanks, Russ Link to comment Share on other sites More sharing options...
MIKE@KENNEBELL Posted August 30, 2010 Report Share Posted August 30, 2010 Do you have any fuel mods yet? What plugs are you running? Link to comment Share on other sites More sharing options...
shelbyguy470 Posted August 30, 2010 Author Report Share Posted August 30, 2010 I am running it exactly as Shelby Autos installed it. I have not done anything to it. Russ Link to comment Share on other sites More sharing options...
2007_Shelby_GT Posted August 30, 2010 Report Share Posted August 30, 2010 I'm no expert here, but it sounds like altitude vs fuel issue. At 6300 feet, your engine would need a leaner mix than at sea level where it would need to be rich. I would guess you could have tried disconnecting the battery while at SAAC so that the computer could "re-learn" the new altitude, then repeat when you returned to Tahoe. Could also be related to the MAF, again caused by the altitude. Either way, I would have THOUGHT that it wouldn't have mattered since that's what superchargers did - allow engines to maintain sea level power outputs as the altitude increased. (to a point anyway, then, like a normally aspirated engine, they to would start losing power with altitude) Just guesses... Sam Link to comment Share on other sites More sharing options...
TheKurgan Posted August 30, 2010 Report Share Posted August 30, 2010 I would datalog a few things especially the FPDC and fuel pressure. At sea level you're going to be shoving alot more air in there which will require more fuel. $1500 for the GT500 setup is a little high imo. I bought a new kit on the classifieds for $650 and installed it myself in 2 hours. Link to comment Share on other sites More sharing options...
kahmann Posted August 30, 2010 Report Share Posted August 30, 2010 Hey Russ I saw your FB message in my email, but can't open it at work. I agree with Kurgan. You definitely need to datalog the cycle duty of your pump and injectors. The GT500 pump is a great way to go, especially compared to the hack job Walbro piggyback setup that Paxton supplied with their kits, but I'd suggest making sure that the pump is the issue before spending any dough. Link to comment Share on other sites More sharing options...
HARALD KELLEY Posted August 31, 2010 Report Share Posted August 31, 2010 I echo Ken's comment about the fuel pump mod. When SAI installed my Paxton, I had them install the GT 500 pump verses the Paxton mod. Good luck. Link to comment Share on other sites More sharing options...
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