Vortech Cobra feels like it's down 100hp?

viperbluelx

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I bought a 98 Cobra a few weeks ago with an S-trim supercharger. The car has had this current setup literally since 1999. I replaced the old serpentine belt and did a smoke test to check it for vacuum leaks. The car makes 10psi but literally feels like it's making around 300rwhp. I didn't notice fuel pressure slightly dropping while in boost but never heard any signs of detonation and the car had no obd2 codes present. Runs and drives perfect other than feeling very weak. I took it to the track last night just to verify and it only went 82mph in the 1/8th. Any ideas where to start?
 

Deceptive

Brad's Spirit Donkey
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Correct but it may give you some insight. Check A/F, do a compression test, check pumps, fuel filter, gas, etc...


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viperbluelx

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I made a 3rd gear pull and had a buddy watch the gauges. Fuel pressure raises to 50psi at full boost but then slowly falls back all the way to 40. I ordered the improved GT supercar pump and see if that helps.
 

98 Saleen Cobra

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Start with getting a real tune on it. they'll be able to data log and tell you more.. Running a FMU? Upgraded injectors? inline pump? Bigger in tank?

There are so many variables.
 

viperbluelx

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The car was dyno tuned by Brooks Speed, it's got 42lb injectors. Fuel pump is unknown but it at one point had a T-rex that's been removed because I can see the brackets and wiring. That's why I'm going ahead with a good pump.
 

98 Saleen Cobra

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He's my recommendation..

Get that good pump like you're doing, maybe a BAP for it. See what size pulley is on the Vortech. Then get a retune.

If it aftercooled?
 

98 Saleen Cobra

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ok, so get the fuel thing figured out, and re tuned. Don't go WOT any more. Hopefully there isn't damage
 

nomoretickets

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As other's said, i would NOT got WOT until you get the car to a reputable tuner and figure out what you are working with.
 

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