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Old 03-25-2009, 07:38 PM   #1
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4.0 TB on 2.5.. idle question

I just put this on last saturday. My engine runs good, but when I start it, it now takes about 8 seconds to go from 2k rpm to about 900 rpm. Did I miss something in the swap? Not a big problem, but somewhat annoying.

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Old 03-25-2009, 07:46 PM   #2
Knows a couple things...

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Probably a small vacuum leak between the TB and intake manifold. High idle rpms are generally always a result of a vacuum leak somewhere and since you just bolted it on, it's probably related.

By the way, Jp Magazine tried that too last year just to see if the rumors were true and they said they noticed a slight loss of performance.

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Old 03-27-2009, 07:18 PM   #3
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Hmm.. no loss of performance for me.. but not a hugh boost either. thanksl
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Old 03-27-2009, 10:08 PM   #4
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Slight increase at wide open throttle for me. A hill I normally drive I can now make it further up it without downshifting than I could with the 2.5 TB. Not the most scientific test, but I do seem to have more top end power. Low end, no change.
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