Aight guys, does anyone know how much power a stock bottom end can take on a 4.0? I wanna throw a turbo on STONEWALL but I'm not sure how much boost I can run without murdering it.

 

if it blows, that was too much.

 

The 4.0 has a relative small compression rate of 9.7:1. So it can withstand some decent boost, some people I have talked to have run 11 psi and not had any problems, to me that is pushing it, if it was mine I would be right around 8 psi.

 

I've heard numbers around 400.

 

this things bottom end can take more than 350 horses?

 

It's supposed to suck not blow.

 

ha ha ha !!! nice !
i 've been running 13#s since March 25th of this year

 

tubro 2.8, you're running a stock bottom end with a turbo? I didn't realize the 4.0 could take that much abuse! maybe I didn't give Ford enough credit before lol

 

I've been running 10 - 12 lbs on my Xcharger since August 2009 and have 153,000 miles on this motor with nothing done other than installing the Xcharger Xtreme kit. No upper or lower engine work, all stock

 

im actually running a v3 Vortech , with progressive methanol a/f at 11.7
so far so good , im getting ready to change pulleys though , cause it getting cooler and I've seen 14.9 pounds a couple of times