hp gain

04gtboy · Nov 28, 2005

i just ordered a bbk x o/r pipe and flowmaster am thunder cat with mil elimaters my first mod whats factory hp and how much will i gain

Kilgore Trout · Nov 28, 2005

1) Factory hp is 260

2) Zero hp gains from the exhaust

COramprat · Nov 28, 2005

Maybe 7-8 from the midpipe. The catback is a toss-up. Some say 0...others claim 4-5HP. You will not "gain" flywheel HP meaning you will still be at 260 but you will free up some that is lost at the wheels.

Kilgore Trout · Nov 28, 2005

Ok, well Coramprat knows more than I do but I still say no SOTP difference...

streetstang03 · Nov 28, 2005

SOTP meter definetly will feel the midpipe...i know i did. like coramprat said ~10hp from midpipe and no more than 5hp from the catback.

keep in mind the 260hp rating from the factory is fly wheel hp, not rear wheel hp.

ponysarepretty · Nov 28, 2005

coramprat said:
Maybe 7-8 from the midpipe. The catback is a toss-up. Some say 0...others claim 4-5HP. You will not "gain" flywheel HP meaning you will still be at 260 but you will free up some that is lost to the wheels.

you are gaining flywheel HP, the only time you will free up parasitic loss is when you change a component of the driveline. think about it.

tomustang · Nov 28, 2005

My e-dyno broke so i can't help

Kilgore Trout · Nov 28, 2005

Is it too late to change my answer?

COramprat · Nov 28, 2005

Kilgore Trout said:
Ok, well Coramprat knows more than I do but I still say no SOTP difference...

It's just numbers though...I barely felt anything from my swap (still have the stock catback) but my dyno numbers say different.

I based my findings on this: Went to a dyno day. There were two other NPI GT's besides mine. One had no mods except K&N and American Thunder catback. He dyno'd at 174HP...

Second car had mods similar to mine except the PI intake and he had full Bassani exhaust w/an X and 3.73's...197HP.

My car...PI Intake, Mac Prochamber, fenderwell CAI, TB and plenum Screamin' Demon Coils, 4.10's...213HP.

I think the difference in cars 1+2 was the X...mine made the power with a combination of the midpipe and the upper air flow. I haven't dyno'd since my cam install but thinking I'm around 235 now. Keep in mind these were NPI cars (mine being a PI intake swap only with stock heads). Your results on the PI car will probably be a little better.

COramprat · Nov 28, 2005

ponysarepretty said:
you are gaining flywheel HP, the only time you will free up parasitic loss is when you change a component of the driveline. think about it.

But all you are doing is increasing the output air flow with a midpipe? The engine is rated at 260 (Mine is 215 :roll: )and you are restricting that with cats in relation to your RWHP. That will decrease your RWHP. Pull them off and you increase your RWHP but the FWHP won't go up until you make increases in upper airflow. Maybe I have my info wrong...

03ghoststang · Nov 28, 2005

you will see increase in both WHP and FWHP since the cars are rated at 260HP at the fly the parasitic loss is roughly about 15-20%. So if you gain RWHP then the HP at the fly should go up also, since the engine is not forcing the exhaust out like when it had the Stock mid pipe, now it will flow more freely.

tomustang · Nov 28, 2005

Kilgore Trout said:
Is it too late to change my answer?

ponysarepretty · Nov 28, 2005

coramprat said:
But all you are doing is increasing the output air flow with a midpipe? The engine is rated at 260 (Mine is 215 :roll: )and you are restricting that with cats in relation to your RWHP. That will decrease your RWHP. Pull them off and you increase your RWHP but the FWHP won't go up until you make increases in upper airflow. Maybe I have my info wrong...

I think you have your logic a little wrong. How much air goes in and out of your engine does effect how much power it makes. Because an engine is basically a massive air pump, the more air that is moves, the more power it will make, in theory. The cats restrict air flow, thus dampening your motor's ability to produce power. However something liek the tranny and the sound energy it gives off eats up power as it goes from your motor to the ground.

comporange04GT · Nov 28, 2005

03ghoststang said:
you will see increase in both WHP and FWHP since the cars are rated at 260HP at the fly the parasitic loss is roughly about 15-20%. So if you gain RWHP then the HP at the fly should go up also, since the engine is not forcing the exhaust out like when it had the Stock mid pipe, now it will flow more freely.

I have to agree. I guess you can look at it like this: It is the same thing as doing an engine buildup and dynoing the motor with different headers/mufflers before you put it in the car (Car Craft and Hot Rod do these tests frequently). The horse power and torque figures change and there are no wheels.

ponysarepretty · Nov 28, 2005

But for all intensive purposes RWHP is the figure you want to remember, because if your motor produces 1000 hp and 50% of it reaches the ground, its no better than a car that produces 700 hp and 70% of the hp reaches the ground.

jstreet0204 · Nov 28, 2005

The 260 hp is SAE net hp which is rated at the flywheel with all accessories and exhaust systems intact. So the answer is, Yes you will gain FW hp. If the standard used was gross hp where no accessories and open manifolds were used then you wouldn't.

03ghoststang · Nov 28, 2005

ponysarepretty said:
But for all intensive purposes RWHP is the figure you want to remember, because if your motor produces 1000 hp and 50% of it reaches the ground, its no better than a car that produces 700 hp and 70% of the hp reaches the ground.

that is true its all on how much of it you can lay to the ground effectively :Word:

Mossberg · Nov 28, 2005

04gtboy said:
i just ordered a bbk x o/r pipe and flowmaster am thunder cat with mil elimaters my first mod whats factory hp and how much will i gain

I hope you like an extremely raspy exhaust note, because you just bought one!

streetstang03 · Nov 28, 2005

Mossberg said:
I hope you like an extremely raspy exhaust note, because you just bought one!

w/o a doubt.

BBK

ponysarepretty · Nov 28, 2005

jstreet0204 said:
The 260 hp is SAE net hp which is rated at the flywheel with all accessories and exhaust systems intact. So the answer is, Yes you will gain FW hp. If the standard used was gross hp where no accessories and open manifolds were used then you wouldn't.

its not all accessories, its all accessories now, but when the 260 was claimed it wasn't. also back then they could use some super slick lubricants, very cold inlet temps etc.

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