PI swap HP

[four six]

Im in the process of getting Pi heads, and was wondering how much rwhp I should get? I have a 1998 GT 5 speed, o/r X with flows, MAC cai. I would be doing a complete swap, heads, cams, intake the works.

 

[98blackmagic]

If you are going to use the factory cams with the heads and PI intake, around 40hp is a close bet. However if you want some extra power I would suggest a set of cams like VT stage 1's or the comp 262's or 270's.

 

[mrvax]

I'm currently at about 250rwhp/290rwtq.

 

[CanadaStang]

You should get an extra 40rwhp from the PI swap.

 

[tomustang]

some people have gained 40-60rwhp from the swap

U.M.

 

[four six]

what type of cam should I use if I decide to ditch the stocker?

 

[69Rcode_Mach1]

Go with the VT stage 1 cams. Wouldn't go above stage 2.

 

[ADRENLN]

yea i think you will get a nice 40-50 rwhp bump. you will love the way it feels with that type of power gain!

 

[billfisher]

who knows.... maybe pi power plus your mods?

 

[four six]

awesome. thanks guys. I've been looking for qutoes for the install and I was wondering how much to do everything? I want to get around 250-275rwhp and 270-300 rwtq

 

[four six]

Ok I know that the 4.6/5.4 PI heads are the same. I was wondering if the PI heads that came on the f-150's were the same as the stangs?

 

[CanadaStang]

Ok I know that the 4.6/5.4 PI heads are the same. I was wondering if the PI heads that came on the f-150's were the same as the stangs?

The 5.4 heads on the F-150's are the same as the Windsor Mustangs.

 

[four six]

The 5.4 heads on the F-150's are the same as the Windsor Mustangs.

so whats better winsor or romeo? Do I need to use 93 octane with the heads on my 98 GT?

 

[98blackmagic]

so whats better winsor or romeo? Do I need to use 93 octane with the heads on my 98 GT?

I dont think one is better than the other, but I may be wrong.

 

[1LowGT]

run premium fuel though it bumps the compression up

 

[CanadaStang]

so whats better winsor or romeo? Do I need to use 93 octane with the heads on my 98 GT?

Performance wise they are the same, it's just easier and cheaper if you stick with the Romeos [your engine is a Romeo] as you can use your existing valve covers.

 

[chimchim]

Hey Four Six, here's a dyno sheet after my PI swap. Other mods are in my sig (this was before the pulleys). DO IT.

The graph looks weird because the torque and horsepower numbers are on a different set of numbers. If you compare the TQ and HP at 5,250RPMs, you'll notice they're both about 250.