PI swap HP

four six

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Jan 19, 2006

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Hobart, IN

Jan 30, 2006

#1

• Jan 30, 2006

• #1

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

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Jan 30, 2006

#2

• Jan 30, 2006

• #2

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

Stay thirsty my friends

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Nov 29, 1999

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Jan 30, 2006

#3

• Jan 30, 2006

• #3

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

 

CanadaStang

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Jan 30, 2006

#4

• Jan 30, 2006

• #4

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

 

tomustang

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Jan 30, 2006

#5

• Jan 30, 2006

• #5

some people have gained 40-60rwhp from the swap

U.M.

 

four six

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Jan 19, 2006

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Hobart, IN

Jan 30, 2006

#6

• Jan 30, 2006

• #6

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

 

69Rcode_Mach1

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Apr 20, 2004

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Jan 31, 2006

#7

• Jan 31, 2006

• #7

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

 

ADRENLN

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Apr 16, 2003

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NJ

Jan 31, 2006

#8

• Jan 31, 2006

• #8

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

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Jul 17, 2005

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Jan 31, 2006

#9

• Jan 31, 2006

• #9

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

 

four six

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Jan 19, 2006

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Hobart, IN

Feb 2, 2006

#10

• Feb 2, 2006

• #10

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

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Hobart, IN

Feb 3, 2006

#11

• Feb 3, 2006

• #11

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

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#12

• Feb 3, 2006

• #12

four six said:

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?

Click to expand...

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

 

four six

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Hobart, IN

Feb 3, 2006

#13

• Feb 3, 2006

• #13

CanadaStang said:

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

Click to expand...

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

 

98blackmagic

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#14

• Feb 3, 2006

• #14

four six said:

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

Click to expand...

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

 

1LowGT

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Feb 3, 2006

#15

• Feb 3, 2006

• #15

run premium fuel though it bumps the compression up

 

CanadaStang

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#16

• Feb 3, 2006

• #16

four six said:

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

Click to expand...

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.

 

C

chimchim

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Feb 3, 2006

#17

• Feb 3, 2006

• #17

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.