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Topic Review (Newest First)
05-06-2012 10:46 AM
Originally Posted by Xpress View Post
^Yes, the increase in HP is generally minute, it takes a whole slew of parts to really wake the engine up.
That's what I figured. Its likely a more responsive throttle because of the larger opening.
05-06-2012 10:34 AM
Xpress ^Yes, the increase in HP is generally minute, it takes a whole slew of parts to really wake the engine up.

Like mentioned, you have a TBI model, the 4.0 engines were MPFI, so it won't work unless you can somehow figure out how to wire your 89 sensors to it, as well as mount the injector inside of the 4.0 throttle body...
05-06-2012 10:31 AM
P0234 Has anyone posted up any dyno charts with the new tb vs the old?
05-06-2012 10:22 AM
Ibuildembig Your 89 should be TBI not sequential fire
05-06-2012 10:19 AM
4.0 tb on a 2.5?

I have read that a 4.0 tb will fit on a 2.5? If so is there a big difference in power? Is there very much modification involved? I have a totally rebuilt 2.5 in my 89 yj that is .30 over and she has a lot more power than before just trying to get all I can out of my 4 little hamsters!!!

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