Need help sounds like a 2step at 3500rpm
01-04-2013, 09:53 PM
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Need help sounds like a 2step at 3500rpm Alright so I recently put a STS kit on my car it ran good for about a week and then now when I floor it in 1st or 2nd it sounds like the car has a 2step and bucks when it gets 3500rpm. All I know is that the turbo burned some uncalculated oil with the initial install. But when I drive normally and gradually put my foot down the turbo spools up nice and sound.
Any thoughts? Could it be a ridiculous misfire going on? Could the turbo be holding the engine back?
Any thoughts? Could it be a ridiculous misfire going on? Could the turbo be holding the engine back?
01-05-2013, 11:34 AM
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No wideband but nothing changed with the boost and is still making 5psi. Someone mentioned to me about speed density tuning by disconnecting the MAP sensor or the MAF and all I read is the SDT is better for FI cars
01-05-2013, 02:34 PM
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This happened to me a few months ago. We tried everything. It ended up being a bad turbo. Same thing. Ran fine got some excess oil and was done. I didn't think it was the turbo because I could still get 5psi but that was it and couldn't get the car to even run past 3500rpms. Finally, swapped the turbo's and 25lbs of boost and no issues since!
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01-05-2013, 06:19 PM
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I had nothing else to try and sent one in and was told it had metal in it and could be rebuilt. So I had them rebuild it. Tried to run the car again and still didn't work. So I took the other turbo off that had absolutely no play in the shaft and quess what? They said it was toast with metal. I was still pissed for paying to rebuild the other turbo so I went ahead and purchased two brand new On3 70mm's for $324 shipped. shoot just the rebuild for the precision was $500. Once I got the ON3's I mounted them up and car ran perfect and has since.
01-05-2013, 06:57 PM
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Well I tightened down all the clamps and replaced all the couplings and now the car runs fine. I haven't noticed any lack in power since the initial install but I still don't think a couple of loose couplings would cause the motor to sound like the timing was off. I will replace the turbo though just to be on the safe side.