All these bolt ons and only 207rwhp!! HELP ME :(

98GTfromGA

Founding Member

Mar 17, 2002

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Memphis

Jan 10, 2004

#41

• Jan 10, 2004

• #41

they must have dynoed the car in 1st gear or something

 

ADRENLN

Active Member

Apr 16, 2003

2,342

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49

NJ

Jan 10, 2004

#42

• Jan 10, 2004

• #42

take your car to the track, then you should know. the altitude dosn't effect the track does it?

 

StangLou

Active Member

Jul 9, 2003

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Holly Springs, NC

Jan 10, 2004

#43

• Jan 10, 2004

• #43

I would think it can affect track time. Higher altitude = less O2 in the engine, so less O2 = less power the engine can make resulting in slower times.

 

Sam98

Founding Member

Mar 15, 2002

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Albuquerque, NM

Jan 10, 2004

#44

• Jan 10, 2004

• #44

ADRENLN said:

take your car to the track, then you should know. the altitude dosn't effect the track does it?

Click to expand...

The nominal ambient air pressure at sea level is 29.9in-Hg (14.7psi); at this altitude it is typically 24in-Hg (11.8psi). Because the pressure is lower, there is less vacuum developed by the engine and less air/fuel mixture getting in the cylinders. That lowers HP and track times. It takes 2.5# of boost to compensate for the altitude and get the same power output you'd have at sea level (assuming you didn't have any parisitic losses). And for the comment about the dyno: they do it in 4th gear for a 5 speed (3rd for an auto).

 

J

johntekin

New Member

Sep 26, 2003

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Albuquerque, NM

Jan 10, 2004

#45

• Jan 10, 2004

• #45

????

Does anyone agree with sam98???

 

forpit2000gt

Founding Member

Jun 30, 2002

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Columbia, SC

Jan 10, 2004

#46

• Jan 10, 2004

• #46

higher altitude will = less hp and slower track times.
Did you ever answer the question, " what is the compression" ?

 

nate01gt

New Member

Aug 30, 2002

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Jacksonville,FL

Jan 10, 2004

#47

• Jan 10, 2004

• #47

you got a TURD

 

H

hotrodman

New Member

Dec 28, 2003

90

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Boston ,Mass

Jan 10, 2004

#48

• Jan 10, 2004

• #48

my 99 cobra dynoed at 298 rwhp.with these mods, the dreaded mac longtubue headers that make my car smoke like a dog,o/r/h-pipe,mac back system,pulleys,3.27 gears.k/n air filter , and no computer tuning,just installed 62mm t.b.,4.10 gears i didnt like so changing to 3.73s.waiten it get pro m air mass than get chip.

 

JonJon

Founding Member

Aug 16, 2002

4,801

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68

back in Marylands

Jan 10, 2004

#49

• Jan 10, 2004

• #49

hotrodman said:

my 99 cobra dynoed at 298 rwhp.with these mods, the dreaded mac longtubue headers that make my car smoke like a dog,o/r/h-pipe,mac back system,pulleys,3.27 gears.k/n air filter , and no computer tuning,just installed 62mm t.b.,4.10 gears i didnt like so changing to 3.73s.waiten it get pro m air mass than get chip.

Click to expand...

62mm tb? Isn't stocker 65?

 

D

DerekStangGT

My package is in the mail!

Feb 18, 2003

1,068

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36

Jan 10, 2004

#50

• Jan 10, 2004

• #50

there is somthing wrong with the machine. maybe it should have read 307 hp once this gets resolved tho, it deserves one of these! but of course not until you find your mysterious 100+ hp. i wish you the best tho

 

AdamantiumKnot

Founding Member

Sep 29, 2001

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nj

Jan 10, 2004

#51

• Jan 10, 2004

• #51

if you're only pulling 207rwhp, want to race?

 

Sam98

Founding Member

Mar 15, 2002

1,625

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Albuquerque, NM

Jan 10, 2004

#52

• Jan 10, 2004

• #52

The altitude saps at least 20% of the power you would have at sea level, but I do think there is something wrong with the dyno too. Last time I was in there he was telling me that 96-98 GTs normally run 145 and 99+ GTs run about 185. There may be something else going on, but I wouldn't worry about it. I know someone with a T-bird that dynoed there at 245 SAE (about 200-205 STD) and ran 14.1 at the track just before it closed. My car was running great when it dynoed 211 and it would fry the tires then. You could always take a road trip to Arizona or Texas and see what you dyno at there...

 

B

Barnaby

Founding Member

Dec 2, 1999

596

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Albuquerque, NM

Jan 12, 2004

#53

• Jan 12, 2004

• #53

I just ran my car at the last dyno drags a couple of weeks ago at the Dyno Edge and made 403 SAE and 340 uncorrected. Nearly identical to when I dyno'd last spring. I'd have to say the dyno is fine(at least when I was on it).

 

Dan_Soprano

15 Year Member

May 7, 2003

7,410

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129

Jacksonville, FL

Jan 12, 2004

#54

• Jan 12, 2004

• #54

Well actually, the pressure altitude of where you are is a HUGE factor. I am a flight engineer on a P-3 Orion in the US Navy. Part of my job is predicting takeoff power for our 4 turbo prop engines. We lose 12 SHP (shaft horsepower) of every 100 feet in altitude above sea level. At 5500ft altitude that would equal roughly 660 SHP loss from each engine. Granted a turbo prop engine is a completely different theory then an internal combustion engine, but the environmental changes still apply. the higher the altitude, the farther apart the air molecules, which means less "O2" for combustion. Sorry for the brainiac explaination.

 

J

johntekin

New Member

Sep 26, 2003

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Albuquerque, NM

Jan 12, 2004

#55

• Jan 12, 2004

• #55

barbaby

barnaby what type of modifications and car do you get dynoed there????!!!!!

 

B

Barnaby

Founding Member

Dec 2, 1999

596

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Albuquerque, NM

Jan 12, 2004

#56

• Jan 12, 2004

• #56

I have a 2001 Bullitt. Vortech S-trim and a lot of tuning.

I also have had my 88 LX up there, H/C/I, strip car.

 

Sam98

Founding Member

Mar 15, 2002

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Albuquerque, NM

Jan 12, 2004

#57

• Jan 12, 2004

• #57

Barnaby said:

I just ran my car at the last dyno drags a couple of weeks ago at the Dyno Edge and made 403 SAE and 340 uncorrected. Nearly identical to when I dyno'd last spring. I'd have to say the dyno is fine(at least when I was on it).

Click to expand...

Was that the Bullitt or the LX? Very nice numbers BTW...

 

B

Barnaby

Founding Member

Dec 2, 1999

596

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Albuquerque, NM

Jan 12, 2004

#58

• Jan 12, 2004

• #58

Thanks
The Bullitt made the 340 number. The LX only made 235rwhp/246rwtq uncorrected(no idea corrected).

They both found different ways to hit mid 12s at the track. One with power and the other with no weight and ridiculous traction(1.64 60ft times).

 

E

edwardohaskillo

New Member

Nov 24, 2003

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The Land of Milk and Honey

Jan 12, 2004

#59

• Jan 12, 2004

• #59

I'd go back to the basics.

FUEL-does your model have a returnless fuel pump? If not, consider checking the fuel pressure regulator. Check the fuel filter and pump too.

AIR-Check for leaks past the meter. Check for any kinks or obstructions in any and all air and vacuum lines.

COMPRESSION-as stated by others, I wonder about your CR. I would check compression on all cylinders and do a leak down.

TIMING-I also wonder about if the cams are timed right. I would also consider having another chip burned.

RPM-dumb thought, but DOHC, ported heads, X-pipe etc. are high rpm items. did they rev it enough?

For me troubleshooting works best if I break things down into categories. Take each category and completely eliminate it before going to another. Otherwise I wind up chasing my tail. And I prefer chasing someone elses tail!

This probably doesn't help much, but i'm trying!