Fast 90/ls2
Fast 90/ls2 Well I finally finished the Fast 90 / LS2 TB install. The issue I had with it setting codes when switched on turned out to be a bad TB that I bought as "new" from the "other" forum.
My first impression is not good. Although it is definitly stronger at WOT, it now has a "soggy" bottom end and mid range. It has no hesitation from idle, but it feels just like I installed a hugh non-lockup stall converter. Going along at 40mph in third and easing into the throttle, it is very unresponsive.
The thing I liked most about my car after my Dart head install was the crisp, off-idle reponse. You could hardly tell it had a stall converter until you nailed it, but now. I will try and contact some tuners and get their thoughts to see if this can be "tuned out" If any of you have done an install, let me know what you thought of the change.
If I can't "tune it" it for better low end, I will have to go back to LS6/Ported TB
My first impression is not good. Although it is definitly stronger at WOT, it now has a "soggy" bottom end and mid range. It has no hesitation from idle, but it feels just like I installed a hugh non-lockup stall converter. Going along at 40mph in third and easing into the throttle, it is very unresponsive.
The thing I liked most about my car after my Dart head install was the crisp, off-idle reponse. You could hardly tell it had a stall converter until you nailed it, but now. I will try and contact some tuners and get their thoughts to see if this can be "tuned out" If any of you have done an install, let me know what you thought of the change.
If I can't "tune it" it for better low end, I will have to go back to LS6/Ported TB
Ive heard stories about fast 90 setups requiring pulling considerable timing from both part throttle and WOT in order to see the best gains and firm up midrange. I dont have first hand experience with this, but I may see a similar issue with a ported LS6 intake...
I hit on this topic in another thread (do a search under my name and you will find it)....The unported LS2 TB is your biggest problem plus a stock (unported) FAST will cost you a little in the low speed TQ department. Those are the issues you are experiencing....there is nothing else wrong with your car.
Last edited by Tony Mamo @ AFR; Jun 14, 2006 at 08:11 PM.
Thanks for the input Tony. I had already re-read your post on the low speed issues of the LS2. You definitly seem to have done your reserch on the FAST / any TB combo.
Thanks
Thanks
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