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?Rear Mount Turbo? Help

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Old Jul 14, 2009 | 07:42 PM
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Default ?Rear Mount Turbo? Help

I have a 98 SS A4. I recently had an STS turbo kit installed. It's a 60mm turbo and I'm running 6psi. It was dyno tuned and made 396rwhp and 423rwtq. I took it to the local 1/8mile track and it ran 9.1's. I was disappointed to say the least. The car stock was running 9 flat. I'm no meachanic so I don't know why it would do this, so any thoughts or advice would be greatly appreciated.
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Old Jul 14, 2009 | 08:13 PM
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Originally Posted by 5.7NSIDE
I have a 98 SS A4. I recently had an STS turbo kit installed. It's a 60mm turbo and I'm running 6psi. It was dyno tuned and made 396rwhp and 423rwtq. I took it to the local 1/8mile track and it ran 9.1's. I was disappointed to say the least. The car stock was running 9 flat. I'm no meachanic so I don't know why it would do this, so any thoughts or advice would be greatly appreciated.
Boost leaks. Hotside leaks could also do it, but my bet is on the cold-side piping.
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Old Jul 14, 2009 | 08:31 PM
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What was the trap speed? If the trap speed increased but the car now has traction problems that could be your problem.
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Old Jul 14, 2009 | 08:56 PM
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Originally Posted by black98ws6ta
What was the trap speed? If the trap speed increased but the car now has traction problems that could be your problem.
It was around 79-80mph which is what it was doing stock. But I do know it isn't a traction problem because I was running on Mickey Thompson Street Radials.
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Old Jul 14, 2009 | 08:57 PM
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Originally Posted by gametech
Boost leaks. Hotside leaks could also do it, but my bet is on the cold-side piping.
Is there any way to check for this?
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Old Jul 14, 2009 | 09:07 PM
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Buy PVC encaps that match the size of your pipes. Install an air fitting in the endcap. Use something to couple the PVC cap to your pipe, then pressurize the pipe. Smoke helps, but you may be able to hear a leak without it.
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Old Jul 14, 2009 | 10:41 PM
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Even your dyno number sounds a little low, but I would boost test it first and see what you come up with. Do you notice anything different with the car this time at the track vs when it was stock? How it launches, 60's ect.
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Old Jul 14, 2009 | 10:51 PM
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That power number seems low for 6psi. What is your AFR, timing, is it intercooled? justseems like you should be in the 425hp range to me.
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Old Jul 14, 2009 | 11:00 PM
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Originally Posted by 5.7NSIDE
396rwhp and 423rwtq.
up-grade your fuel pump, injectors, valve springs, rockers, LEP custom turbo cam, and exhaust wrap will put you at about 500 to the wheel with a good tune and 91oct. fuel
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Old Jul 14, 2009 | 11:03 PM
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well ,what I was trying to get at with driveability and also the HP number, sounds like he might be slipping the old 4l60 or blowing through an old converter. Have you changed or upgraded anything in your driveline?

P.S, where are you at in NC, and what track?
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Old Jul 15, 2009 | 01:57 PM
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ya where in NC?
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Old Jul 15, 2009 | 06:21 PM
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Heres a picture of the dyno chart









It does have an intercooler and a trans cooler on it as well, but thats about it. The car pretty much feels the same as stock from a launch. It's like the turbo really dosn't even make a difference until you get past 60mph. I'm sure it would help my 1/4 mile time. But I've never ran it on a 1/4.
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Old Jul 15, 2009 | 06:24 PM
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Originally Posted by Super Slow SS
P.S, where are you at in NC, and what track?
I'm in Kings Mountain. About 30mins west of Charlotte. The track I go to is in Boiling Springs NC. Shady Side Dragway.
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Old Jul 15, 2009 | 06:29 PM
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how about a list of engine mods? stock motor/heads? something is def wrong on the top end.
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Old Jul 15, 2009 | 06:42 PM
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you should defenitly have an improvment,sumthings wrong somewhere,good luck
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Old Jul 15, 2009 | 06:56 PM
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Originally Posted by RooRnZ28
how about a list of engine mods?
The motor is all stock.
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Old Jul 15, 2009 | 07:00 PM
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I talked to the guy today that done the tuning for me and I'm gonna take it back to him next week. He's gonna check it out for me, and probly put it back on the dyno again.
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Old Jul 15, 2009 | 07:02 PM
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Originally Posted by 5.7NSIDE
The motor is all stock.
dual valvesprings and hardened pushrods should be in your future. See if those changes improve anything, as they should help out the stock motor quite a bit
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Old Jul 15, 2009 | 07:15 PM
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im in greenville .. but I get to fayetteville for the track and benson some for the 8th
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Old Jul 15, 2009 | 10:37 PM
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Originally Posted by 5.7NSIDE
I have a 98 SS A4. I recently had an STS turbo kit installed. It's a 60mm turbo and I'm running 6psi. It was dyno tuned and made 396rwhp and 423rwtq. I took it to the local 1/8mile track and it ran 9.1's. I was disappointed to say the least. The car stock was running 9 flat. I'm no meachanic so I don't know why it would do this, so any thoughts or advice would be greatly appreciated.
Are you boosting off the line?
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