HP Gains

[handyman_321]

I just found out I have aftermarket high flow cats on my 99 gts with stock heads but a borla exhaust. I also have smooth tubes and a lightened flyweel. How much of a hp increase from the stock 450 do these things give me?

Handy

 

[RTTTTed]

I would guess 465rwhp. The stockers don't normally make 450RWhp on a dyno. Stock hp is rated by a formula and although Dodge is usually underrated as per crankshaft hp, they usually don't make the numbers on a car dyno.

Ted

 

[2001 GTS]

I'd guess 440-445rwhp

 

[handyman_321]

Those guesses are higher than I thought... thanks. So does that mean I would have 500 at the crank? Cuz that would be nice to tell evryone who asks...lol

 

[plumcrazy]

not likely as high as 450rwhp...more like 435 tops

 

[dave6666]

Smooth tubes and K&N's are the ACR upgrade, and Dodge spec'd that combo at 460 vs. 450 for the non ACR. So I call those options worth 10 at the flywheel.

Lightened flywheel only adds apparent hp, but not real hp.

I've seen people discuss 10 hp or so on cat-back exhausts, maybe 5 to 10 more or so on the cats.

My '01 GTS has the tubes and K&N's, with a Bellanger cat-back. I say 470 hp. Never gotten me thrown out of a bar.

 

[Mccarlin]

not likely as high as 450rwhp...more like 435 tops

Exactly, im guessing about 425rwhp. Most stock Gen II's dyno around 390-410rwhp then add about 20-30rwhp for the exhaust, cats, and smooth tubes.

 

[apun]

I have the old Borla cat back, no cats, smooth tubes, and K&N filters and dyno'd ~426rwhp on my 99GTS.

Alex

 

[dodgefever]

My '99 GTS has stock exhaust, lightened flywheel, smooth tubes, K&N filters, Roller Rockers, 3.55 rear, and is Silver(slower than red?!?), and I have the Dyno sheet at 440.2 at the wheels. I hope that helps you a little.

 

[RobZ]

Dyno numbers are always different from dyno to dyno. Especially if you're using different brands...my GTS (K&N, smooth tubes, rear muffler delete) dynoed 422RWHP and 465RWTQ on a Dynojet dyno and 377RWHP and 436RWTQ on the Mustang dyno at our shop. No changes were made to the car, that is just the difference in calibration between the two.

I also believe the factory rating of 450 crank HP is low, I would bet it's closer to 465 on average. This is using the industry standard Dynojet to measure the numbers. If you go by the Mustang measurements the 450hp 490lb/ft make much more sense.


Just my $.02


Rob



and yes I will use any excuse to squeeze in a couple pics of my baby.

That's me operating the dyno.

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[RAYSIR]

[/quote]
and yes I will use any excuse to squeeze in a couple pics of my baby.
[/quote]
Yeah, same here. Dang, those cars look familiar!!