1998 4.6 question

cobra2798

New Member

Mar 30, 2005

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Clermont, Florida

Feb 1, 2009

#1

• Feb 1, 2009

• #1

As some may know im swapping out my blown motor for a PI swapped motor out of a 98. I have heard that the 98 motors made a little more power than the 96-97's, is this true and if so why? thanks.

 

sneaky98gt

10 Year Member

Apr 23, 2008

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Feb 1, 2009

#2

• Feb 1, 2009

• #2

I think I have read before that the 98 has slightly improved headers. Can't swear to it, but I'm pretty sure.

 

98COBRA281

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Nov 24, 2007

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Feb 1, 2009

#3

• Feb 1, 2009

• #3

yes, 98's have 10hp more, because they have "bigger" exhaust manifolds, and a little more timing in the stock tune.....

 

mrvax

Stay thirsty my friends

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Nov 29, 1999

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Feb 2, 2009

#4

• Feb 2, 2009

• #4

I've never heard of larger exhaust manifolds. I've always been told it's due to a more agressive tune in the EEC.

 

JH96GT

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Aug 20, 2000

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Feb 2, 2009

#5

• Feb 2, 2009

• #5

mrvax said:

I've never heard of larger exhaust manifolds. I've always been told it's due to a more agressive tune in the EEC.

Click to expand...

+1

 

hotrodredneck

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Jul 28, 2004

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Feb 2, 2009

#6

• Feb 2, 2009

• #6

so it's a 98 GT engine that had the PI swap done to it? cause I could have sworn the 99 motors were the first true PI ones

 

98COBRA281

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Nov 24, 2007

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Feb 2, 2009

#7

• Feb 2, 2009

• #7

hotrodredneck said:

so it's a 98 GT engine that had the PI swap done to it? cause I could have sworn the 99 motors were the first true PI ones

Click to expand...

99 is the first year of the pi motors, but 98 (225hp) made 10 more hp then the 96-97's (215hp)

 

cobra2798

New Member

Mar 30, 2005

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Clermont, Florida

Feb 3, 2009

#8

• Feb 3, 2009

• #8

hotrodredneck said:

so it's a 98 GT engine that had the PI swap done to it? cause I could have sworn the 99 motors were the first true PI ones

Click to expand...

98 motor w/ PI cams and intake. I got a killer deal on it.

 

Miles

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Burlington, ON

Feb 3, 2009

#9

• Feb 3, 2009

• #9

98COBRA281 said:

99 is the first year of the pi motors, but 98 (225hp) made 10 more hp then the 96-97's (215hp)

Click to expand...

Exactly. If i was putting in a motor into a 96-98, at minimum it would be a 99+ motor

 

trinity_gt

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Jan 31, 2003

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Feb 3, 2009

#10

• Feb 3, 2009

• #10

cobra2798 said:

98 motor w/ PI cams and intake. I got a killer deal on it.

Click to expand...

Without the heads it's not a true "PI swapped" motor.

 

COramprat

...I can take it. I think.

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Feb 3, 2009

#11

• Feb 3, 2009

• #11

PI cams and intake and you are pretty good as far as the HP bump. The PI heads are minimal at best for increased power. In the 98 you should be at or above 240RWHP.

 

sneaky98gt

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Feb 3, 2009

#12

• Feb 3, 2009

• #12

Some places I've seen the extra 10 hp in the 98 GT attributed to the headers. In other places it is attributed to the EEC and an "upgraded fuel system." So for which one it actually is: