fast 90 removal

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Apr 26, 2008 | 03:27 PM

c5mtl

Thread Starter

Drifting

Joined: Feb 2005

Posts: 1,869

Likes: 61

From: montreal quebec

fast 90 removal

i put back my stock ls1 intake and tb and now the car doesnt idle well.....what i mean is....when i start the car it shoots up to 2k and then settles down ....then i tap the gas and again shoot up and settles down again.....then i put it into drive and just before it engauges drive it shoots up 2-3k......do u think its a vacumm leak unmetered air after the maf or do u think the tb i bought from a forum member is junk..no codes...is a fast 90/90 a mod that can be swapped in and out without a retune.....
Thanks

Last edited by c5mtl; Apr 26, 2008 at 03:29 PM.

Apr 26, 2008 | 04:01 PM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

Likes: 192

From: At the beach in little Rhody

I think a normal tune for a FAST includes modification of the table that determines blade angle vs. air in (or something to that affect) such that a re-tune will be required. However, it also sounds like you have a vacuum leak.

Last edited by vettenuts; Apr 26, 2008 at 05:18 PM.

Apr 26, 2008 | 04:47 PM

LinearX

Pro

Joined: Aug 2006

Posts: 565

Likes: 2

From: Chattanooga TN

vettenuts is right on. If the car was tuned with the FAST 90/90 combination and you put an LS1 intake and stock sized throttle body, then you need to have the tune modified for that.