1998 NPI mustang with KB 2.1 ?

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casper98gt

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Jun 27, 2005

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Mar 21, 2007

#1

• Mar 21, 2007

• #1

Ok, so i have installed PI intake and cams on the NPI. Have all bolt ons, control arms, clutch, driveshaft..the list goes on. Also have 80shot of nitrous.

All the dyno charts i have found online on other forums and such show that the heads are the worthless point on a PI swap.

So i was wondering if the NPI heads flow decently enough to put a KB 2.1 on my 98. Just stick to the 9psi pulley. And since im getting rid of the intake to swap to the KB intake the cams are already there so i wonder how much power it would be making over a stock NPI motor.

Just an idea, i was wondering if anyone else on these boards had a NPI mustang with a KB on it. Without the raised compression of the PI heads

 

speedfreak98r

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Jan 31, 2006

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Houston Area

Mar 21, 2007

#2

• Mar 21, 2007

• #2

The non-PI heads should flow just fine with the KB. What kind of cams do you have? To maximize efficiency, you might want to consider blower cams.

 

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casper98gt

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Mar 21, 2007

#3

• Mar 21, 2007

• #3

I have the factory cams for a 2003 Mustang GT.

I know people with the Vortech on their NPI mustangs but they still have the NPI intake on it. So i was wondering how much more power i could make with the KB intake on top. I dont know anyone with a KB on their NPI mustang.

 

speedfreak98r

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Jan 31, 2006

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Mar 21, 2007

#4

• Mar 21, 2007

• #4

casper98gt said:

I have the factory cams for a 2003 Mustang GT.

I know people with the Vortech on their NPI mustangs but they still have the NPI intake on it. So i was wondering how much more power i could make with the KB intake on top. I dont know anyone with a KB on their NPI mustang.

Click to expand...

I did'nt know you could buy just the KB intake..

 

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casper98gt

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Mar 21, 2007

#5

• Mar 21, 2007

• #5

No but youre getting rid of the NPI intake and putting the blower and intake portion of it on. I didnt mean just a KB intake. haha

 

speedfreak98r

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Jan 31, 2006

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Mar 21, 2007

#6

• Mar 21, 2007

• #6

casper98gt said:

No but youre getting rid of the NPI intake and putting the blower and intake portion of it on. I didnt mean just a KB intake. haha

Click to expand...

In that case, you will gain loads of power. It's a Kenne Bell. It should work fine with the PI cams, and non-PI heads because your compression will be low, and that is ideal for a blower. The heads should flow fine, although having them ported and polished would help.

As for numbers, I could'nt really say, although they should be substantially better.

 

CobraRed_96_GT

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May 20, 2006

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Mar 21, 2007

#7

• Mar 21, 2007

• #7

don't worry about the heads, NPI heads arn't cancer. Port and polishing heads is a step you can do after a long list of things where money is better spent.

 

DropTopPony

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Aug 13, 2002

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Mar 21, 2007

#8

• Mar 21, 2007

• #8

GDawg has a NPI with the 9psi ic'd KB on it, i think he is going to the dyno next week for a better tune and numbers.

 

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casper98gt

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Mar 22, 2007

#9

• Mar 22, 2007

• #9

AWESOME, make sure you get ahold of him and see his numbers. Also what mods does he have along with it?