No power?

1

1996StangGT

New Member

Jul 29, 2009

4

0

0

Jul 29, 2009

#1

• Jul 29, 2009

• #1

Hey guy I'm having some issues with my 4.6 im losing power around 5k rpm. Mods the car has are as follows offroad x-pipe,flowmasters,k&n intake,trickflow upper intake, and ported lower intake. The kid that previously owned the car ported the lower intake is it possible he messed the the power curve up by not knowing what he was doing and porting the lower intake or could there be something more to the problem? Maybe not enough fuel or something I wouldn't think this would be the problem but any input is appreciated.

 

trinity_gt

10 Year Member

Jan 31, 2003

3,125

81

99

Canada

Jul 29, 2009

#2

• Jul 29, 2009

• #2

1996StangGT said:

Hey guy I'm having some issues with my 4.6 im losing power around 5k rpm. Mods the car has are as follows offroad x-pipe,flowmasters,k&n intake,trickflow upper intake, and ported lower intake. The kid that previously owned the car ported the lower intake is it possible he messed the the power curve up by not knowing what he was doing and porting the lower intake or could there be something more to the problem? Maybe not enough fuel or something I wouldn't think this would be the problem but any input is appreciated.

Click to expand...

How did this "kid" port a plastic intake?

When you say you're losing power over 5K, can you be more specific? When stock, the 1996 GT was rated at 215HP at just 4400RPM. The mods on your car don't do much to address the non-power-improved ("NPI") lower intake or cylinder heads. It would make sense that after 5000RPM, 600RPM past the power peak, your car is "losing power."

Do you have, say, a dyno nearby that you can put the car on to generate a baseline?

 

1

1996StangGT

New Member

Jul 29, 2009

4

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Jul 29, 2009

#3

• Jul 29, 2009

• #3

The car just feels really slow. I'm assuming he used a dremel of some sort to port the upper part of the lower intake.He said he ported it so much there were barely any sidewalls left. I had a pretty much stock 1991 gt with the 5.0 and it just seems like the 4.6 is very slow and unusually slow after about 5 thousand rpms its like im driving a 4 cylinder after I reach 5k? I just pictured the car being a bit quicker than it feels maybe I'm completely mistaken.

 

1

1996StangGT

New Member

Jul 29, 2009

4

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Jul 29, 2009

#4

• Jul 29, 2009

• #4

And also no dyno near by.

 

1

1996StangGT

New Member

Jul 29, 2009

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Jul 30, 2009

#5

• Jul 30, 2009

• #5

Bump

 

32ValveRom

Member

Feb 15, 2009

328

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17

Fl

Jul 30, 2009

#6

• Jul 30, 2009

• #6

No offense but I wouldn't have bought any car from some stupid kid. You may want to (1) Look into getting a tune-up or (2) Get some PI heads from an 99-04.

 

98COBRA281

10 Year Member

Nov 24, 2007

1,348

30

59

Port St. Lucie, Florida

Jul 30, 2009

#7

• Jul 30, 2009

• #7

my friend has a bolt on npi car with cams, and right at 5200 it just dies, there nothing more after that, stock npi heads just can flow at high rpm....