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Lisa at Speedlogix(vendor here) could tell you...they sell them.
We have seen 6-8 RWHP adding an 85mm TB to a stock car with no tune. So I would estimate at least that pickup, with a tune you will see alot more...a canned tune picks up 15-20 RWHP on a stock carI'm running a Mopar CAI and Solo Performance cat-back exhaust, no tune. What kind of power gain would I see with an 85mm TB and a tune?
I agree on the 90 and tuning. However for the price I don't really think it is a bad bang for the buck...really the only mod for the same $$ that will give you more HP would be a tuner. All relative, for some folks it makes sense for others it may not. I know I was surprised the first time we did a back to back test on a TB, how much we actually gained on the dyno and trackA TB does not give very good bang for the buck in my opinion. There are plenty of other mods I'd do ahead of that unless you've got a big inch stroker or blower.
A 90mm TB will also require some custom work on your stock setup.
It will bolt right up but it would be pointless with a stock intake the opening at the intake is smaller then 90mm. Stick with a 85mm-87mm TB no intake porting needed with that setup. Also consider a ported TB we are showing the same amount of gains as BBK and you could save alittle coin.Von, did you have to do any modifications to install the 90? I thought i had seen a post stating it would not just bolt right up.
True we port the front and back the butterfly area is smoothed and contoured but if you get the same results and save money does it really matter?but with a ported stocker you are only widening the opening of the tb, not all the way through. correct? gotta stop at the butterfly? with a cast or billet you are getting 85mm all the way through.
so to use a 90 you would just have to port-match the intake to the tb.