car not making 260 hp

dug06430 · 07-10-2001, 12:05 AM

my 2001 mustang GT 5-speed is not making the 260 hp. can anyone give me any input to resolve this using a g-tech and pluging in the correct inputs my car at best reads 221hp .,this is done with 1st and 2ed gear runs shifting at redline . any input would be appreiacated.

Hammer · 07-10-2001, 12:12 AM

You have to remember that the Gtech is only going to measure the horsepower coming from the rear wheels, not the horsepower being produced by your engine....

For a 5-speed, there will be about a 15% power loss going through your transmission\driveshft\rear end before you get the power to the ground...

221 hp is about right at the rear wheels...

Plus, while being pretty darn accurate, a gtech is not as accurate as a dyno...
A dynomometer is really the only "true" measure of your car's power...

------------------
"The Yellowjacket"
381.8 rwhp 377.6 rwtq

"Never underestimate the power of stupid people in large groups."

[This message has been edited by Hammer (edited 07-10-2001).]

Mustang92 · 07-10-2001, 08:47 AM

No offense but G-tech is useless. It's only a rough idea and no where near accurate. If you want a true reading just put it on a dyno.

FWIW...221RWHP/.85 =260FWHP

------------------
00 GT, MAC Offroad H, Steeda Pulleys & Timing Adjuster, 4.10’s, Flows w/turndowns, UPR shifter, UPR Pro Series LCA’s, Lakewood 70/30’s & 50/50’s, 253.8 RWHP/292.8RWTQ
12.91@101.93 (1.74 60ft)
M/M 100, 7085
2001 Mod Motor Shootout 2V NA Champion
Recent Pic from Moroso

SteveK · 07-10-2001, 11:07 PM

While it is true that G-Tech does not always give an accurate reading because you have to manually pu tin the weight, which can lead to errors.

However, I've tested the G-Tech against the dyno. It was only 1hp off. Now, this may not be a typical case. But for what it is worth it is pretty close.

But I think where it really comes in handy is that if you measure the HP with G-Tech, and the you put some mods on and test again. Now you are on the equal footing as the first run and can tell if the power did increase or not.

Hope this helps.
Steve K.

srg60655 · 07-10-2001, 11:10 PM

You have to dyno that thing! Really 221 hp is about right- you have to take in account that 260hp is whats at the flywheel- not rear wheels. You will lose 15% +/- 3% from flywheel to rear. I had my 2001 GT, when it was stock, dyno at 229hp. I bet if you have it dyno'd you will be close to that. What hp a car is advertised is always at the flywheel.
Sg

------------------
2001 Blown GT(Black Beauty)
401rwhp/394rwtq
12.2@117mph

07-10-2001, 12:05 AM	#1
dug06430 Registered Member Join Date: Sep 2000 Location: fairfield,CT,USA Posts: 1	car not making 260 hp my 2001 mustang GT 5-speed is not making the 260 hp. can anyone give me any input to resolve this using a g-tech and pluging in the correct inputs my car at best reads 221hp .,this is done with 1st and 2ed gear runs shifting at redline . any input would be appreiacated.

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07-10-2001, 12:12 AM	#2
Hammer AKA "Dr. Evil" Join Date: Feb 1999 Location: South Fork Ranch Posts: 1,721	You have to remember that the Gtech is only going to measure the horsepower coming from the rear wheels, not the horsepower being produced by your engine.... For a 5-speed, there will be about a 15% power loss going through your transmission\driveshft\rear end before you get the power to the ground... 221 hp is about right at the rear wheels... Plus, while being pretty darn accurate, a gtech is not as accurate as a dyno... A dynomometer is really the only "true" measure of your car's power... ------------------ "The Yellowjacket" 381.8 rwhp 377.6 rwtq "Never underestimate the power of stupid people in large groups." [This message has been edited by Hammer (edited 07-10-2001).]

07-10-2001, 08:47 AM	#3
Mustang92 Drag Racer! Join Date: Nov 1999 Location: Lake Worth, FL USA Posts: 757	No offense but G-tech is useless. It's only a rough idea and no where near accurate. If you want a true reading just put it on a dyno. FWIW...221RWHP/.85 =260FWHP ------------------ 00 GT, MAC Offroad H, Steeda Pulleys & Timing Adjuster, 4.10’s, Flows w/turndowns, UPR shifter, UPR Pro Series LCA’s, Lakewood 70/30’s & 50/50’s, 253.8 RWHP/292.8RWTQ 12.91@101.93 (1.74 60ft) M/M 100, 7085 2001 Mod Motor Shootout 2V NA Champion Recent Pic from Moroso

07-10-2001, 11:07 PM	#4
SteveK Registered Member Join Date: Apr 2001 Location: Round Lake, IL, USA Posts: 51	While it is true that G-Tech does not always give an accurate reading because you have to manually pu tin the weight, which can lead to errors. However, I've tested the G-Tech against the dyno. It was only 1hp off. Now, this may not be a typical case. But for what it is worth it is pretty close. But I think where it really comes in handy is that if you measure the HP with G-Tech, and the you put some mods on and test again. Now you are on the equal footing as the first run and can tell if the power did increase or not. Hope this helps. Steve K.

07-10-2001, 11:10 PM	#5
srg60655 Registered Member Join Date: Jun 2001 Posts: 20	You have to dyno that thing! Really 221 hp is about right- you have to take in account that 260hp is whats at the flywheel- not rear wheels. You will lose 15% +/- 3% from flywheel to rear. I had my 2001 GT, when it was stock, dyno at 229hp. I bet if you have it dyno'd you will be close to that. What hp a car is advertised is always at the flywheel. Sg ------------------ 2001 Blown GT(Black Beauty) 401rwhp/394rwtq 12.2@117mph