Looking to turn up the boost some on my son's 2007 Harley Davidson F150.

Right now the truck has a Whipple supercharger with the 4" pulley making about 4- 4.5psi. boost.

What would be a safe boost level for the 5.4L 3 valve motors?

I'm assuming 6-7 psi.

 

Here ya go...https://www.f150forum.com/f4/dyno-sh...32rwtq-119594/

 

12+ psi. boost seems kinda extreme as far as reliability goes on a stock motor.

I'll have to look into it more before going that far with it.

 

Get with a tuner/performance shop and give them your goals.

They'll be able to help you determine whats "safe" for your combo.

 

Who tuned your truck?

I'm assuming Jim Sr. @ JDM.

 

Why the assumption?

I go between both JDM and Troyer for kits/parts and expertise.

FYI...It's in my sig. Troyer tuned here.

 

I missed the troyer tuned.

I was assuming JDM because they have a very good rep. with the saleen superchargers, I know that from my last car 2006 Mustang with saleen supercharger.

I'll give both shops a call and see what they would suggest for my son's truck.

 

Absolutely, You can't go wrong talking to both and seeing who you perfer. Let us know your decision.

Best of luck.

 

I would be more worried about the trans not taking the torque than the motor. Am I wrong in assuming that? I am new to the F-150's so I dont know much about what power they can hold.

 

I believe the 4R75E TRANSMISSIONS are rated at 750 ft lbs of torque.