Ive always wanted to know how many HP's my 1999 GP GT coupe has with a K&N air intake and a 2.5 downpipe (cat, u-bend delete). Tell me what you guys think
-Thanks,
Bobby
(PS my chrome 18's hold me back alot)
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02-13-2008
Ive always wanted to know how many HP's my 1999 GP GT coupe has with a K&N air intake and a 2.5 downpipe (cat, u-bend delete). Tell me what you guys think
-Thanks,
Bobby
(PS my chrome 18's hold me back alot)
02-14-2008
that would be a toss up. every 3800 car reacts differently to mods. stock factory rating is 200hp at the crank. I am guessing maybe 220? but you have 18's...so I am guessing that will put you back down to stock rating through parasitic drag.
02-26-2008
if it is 200HP at the crank though the loss with the transmission even with the mods, probably putting maybe 175 to the wheels
02-27-2008
Wow that seams low since Edmunds rated the 3.4 at 210hp and the and the 3100 at 165hp. They rate the 3800 at 200hp. Weird
02-27-2008
has nothing to do with engine ratings. Most of them are rated at the flywheel. A car makes more hp when it doesnt have to move the car. You have to take off some for the transmission everything else that makes the car move. so yeah the engine is rated for that, but what you put down to the wheels is another story.
02-27-2008
Also those ratings are engine without cat, mufflers exhaust restrictions or air cleaners airbox restrictions
02-27-2008
not anymore, they are supposed to be rated as installed in the car, but at the flywheelOriginally Posted by mainecrab
02-27-2008
I didnt know that thanks. Been a long time since I looked up horsepower ratings and the agreed standard.
02-27-2008
if u multiply the horsepower of the car at the crank/flywheel by 20% then take that value and subtract it from the inital horsepower number, that'll give u what the actual horsepower is at the wheels; plus or minus a few hp since every car is different.
for example, a GPGT is rated at 200HP, so 200*0.20=40, now take that value and subtract it from 200. so it'd be 200-40=~160fwhp. savvy? lol
02-28-2008
I always heard a 25% loss through the drivetrain. But that may be old school stuff. And with new oils and what not, the number may be different. But none the less, the drivetrain does take a lot of HP away.
And even still, an air filter, down pipe, cat removed, etc isn't going to help all that much. My guess is around 175 HP at the wheel as your car sits.
02-28-2008
it will vary from car to car some also due to wear and what not
05-17-2008
so with a completely stock ,2007 base model gp ,3.8 series III , factory says 200hp / 230tq. so what would i be truely getting at the wheels > hp + tq....
with my stock 2000 GAGT sedan 34.L ram air ,factory says 175hp/205tq..... guys say actually likely only getting 145 hp + actual tq ??. i ran 3 passes at 1/4 mile ran factory 15.9 with extra body in car ,then 15.8 next 2 times no passenger .
i am also guessing my GAGT is faster then my GP
05-18-2008
I ran 15.89 with my stock 99 4 door GP GT w/125k miles. Car has a sunroof with aftermarket 16" chrome rims. I left the headlight in, didn't change tire pressure, no weight reduction, 3/4 tank of gas. I figure the way my car was setup that it should be on the slower side for a stock 3800, so i'm not sure that your GAGT would be faster than your 3.8, although it would be extremely close.
05-18-2008
on average for FWD and drivetrain loss. multiply the hp and tq numbers by 20% then take that total and subtract from the hp and tq. for example the 97-03 has 240hp/260tq. 20% drivetrain loss equates to 48/52 and finally the cars actual fwhp is approximately 192fwhp/208fwtq
05-18-2008
i heard the most hp u can get out of a gt is 300.anybody else heard this?
05-18-2008
Or, to make the math simpler, just multiply by 0.8 and there is your answer...
If you're talking about a 97-03 GT (no supercharger, since 04+ GTs have superchargers), then the most you can get without forced induction is around 300cHP. Which is about 240wHP.
06-03-2008
at the crank but at the wheels 250 or less is about all...
i think your around 160 to 165. i only made 175 to the wheels with more modds on 93octane
06-07-2008
I hope with a K&N air intake and a 2.5 dp Ill be able to get stock HP because of the wheels.
06-07-2008
how do u think i can accomplish this?am i close with the future mods in my sig?or i'll have to do more like cam or rr?
06-07-2008
To get close to 300? You need a pretty aggressive cam and some head work at the very least, in addition to what you have listed. A PCM won't do it either as you'd need a custom tune. And probably headers instead of the Plog/x-over/dp combo.
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