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-   -   4.0 tb on a 2.5? (http://www.wranglerforum.com/f218/4-0-tb-on-a-2-5-a-158351.html)

pendletontn 05-06-2012 09:19 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!!!

Ibuildembig 05-06-2012 09:22 AM

Your 89 should be TBI not sequential fire

P0234 05-06-2012 09:31 AM

Has anyone posted up any dyno charts with the new tb vs the old?

Xpress 05-06-2012 09:34 AM

^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...

P0234 05-06-2012 09:46 AM

Quote:

Originally Posted by Xpress (Post 2339739)
^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.


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