mariobedayo Posted January 26, 2016 Share Posted January 26, 2016 Moses , Thanks, How about if i use a 30 to 31 tire the 4.56 gear is ok in the 2.5L what can i do to add power to my 2.5L change cam change fuel injector or change the throttle body? How about if my engine in the xj is 4.0L with auto tranny, what do i need in this set up. your suggestion please. Cheers:Mario Bedayo Philippines Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted January 29, 2016 Administrators Share Posted January 29, 2016 (edited) Mario...For 30-31 inch tires, you could use 4.56 gears. If the XJ Cherokee is 1991 or newer, there is very little I would do for more power. Some change the intake and air filter, some add a header. A camshaft change would not gain much on a 2.5L four. I would stick with the gearing change.A 4.0L inline six with 33" inch tires calls for 4.56 gears. 30-31 inch tires would be 4.10 gears like I use. Gears, again, will make the biggest difference for the 4.0L or the 2.5L. For power, a 4.6L stroker build of the 4.0L is the best approach. We have covered the 4.6L build-up at the forums, and there are many articles and videos on the 4.6L stroker six at the magazine site.Moses Edited January 29, 2016 by Moses Ludel Quote Link to comment Share on other sites More sharing options...
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