Dynamometer Results & Comparisons - What are headers really worth? About 40rwhp it turns out..




IRONFIST
12-02-2011, 02:01 PM
Well I posted up here about some disappointing results with my car..
I've now deleted that thread instead of having two on the same subject / car.

I'm sure a lot of people wonder what headers are really worth on a modded car, and since I was dumb enough to do a build-up and save headers for last, I can tell everyone exactly what headers are worth on a normal street / strip car.
My mods are simple, and common for the LS1 world
Stock LS1 block 90 000+ miles
T56
LS6 intake
EPS 226/234, .598/.601 Cam
Hooker headers
Stock 243 heads
Comp Springs
All mods before headers: 347.89HP, after headers: 387.27HP

You can check out the dyno graph below.
http://carphotos4.cardomain.com/images/0015/41/61/15431416_large.jpg?v=1


Mike@Diablosport
12-02-2011, 02:15 PM
Yeah, that cam, especially being ground to favor the exhaust, was begging for some headers ;)

bubulle
12-02-2011, 02:57 PM
what size 1 7/8 or 1 3/4 ?


IRONFIST
12-02-2011, 03:02 PM
what size 1 7/8 or 1 3/4 ?

1–3/4"
these ones:
PART #: 2468HKR

gtotoocool1
12-02-2011, 03:03 PM
Well I posted up here about some disappointing results with my car..
I've now deleted that thread instead of having two on the same subject / car.

I'm sure a lot of people wonder what headers are really worth on a modded car, and since I was dumb enough to do a build-up and save headers for last, I can tell everyone exactly what headers are worth on a normal street / strip car.
My mods are simple, and common for the LS1 world
Stock LS1 block 90 000+ miles
T56
LS6 intake
EPS 226/234, .598/.601 Cam
Hooker headers
Stock 243 heads
Comp Springs
All mods before headers: 347.89HP, after headers: 387.27HP

You can check out the dyno graph below.
http://www.cardomain.com/gallery/aid983603#that's more like it.now get a good lid on there and i bet you'll see 400+hp..

2QUIK4U
12-02-2011, 03:06 PM
Nice gains. Stock manifolds really hold back a cammed motor. I agree with the comment on the lid. Get a good lid and you should hit 400.

IRONFIST
12-02-2011, 05:12 PM
You guys really think I can gain 13hp from just a lid? I'd love to hit that magic 400rwhp number but I don't know if it's possible. My engine mods are basically done at this point, there's a 75 shot of nitrous going in ( already have the kit ) and other then that I don't have any plans.

djfury05
12-02-2011, 05:21 PM
1 7/8" would have shown even more gains.. definitely get a lid on there!! easy 10 hp probably if not more.. some tq to be had too

atrain59
12-02-2011, 05:21 PM
To give you a reference I have a BBK intake, SLP lid &bellow ,TSP 228R cam, kooks 1 3/4 race headers they might be 1 7/8 not sure and a ASP underdrive pulley and got 401.72rwhp and 389tq.

So it can be done and my cam is smaller then yours.

HioSSilver
12-02-2011, 05:32 PM
1 7/8" would have shown even more gains.. definitely get a lid on there!! easy 10 hp probably if not more.. some tq to be had too

x2....

KC Henry
12-02-2011, 05:32 PM
Congrats, nice numbers from man!

mac62989
12-02-2011, 07:10 PM
Ive seen that cam hit over 400 rwhp on stock 241s, I dont know if the lid is holding you back but IMO numbers are low with 243s and that size cam..

jlrz28
12-02-2011, 07:46 PM
Gotta love that cam, I do!

IRONFIST
12-02-2011, 07:51 PM
Ive seen that cam hit over 400 rwhp on stock 241s, I dont know if the lid is holding you back but IMO numbers are low with 243s and that size cam..

Crap... I think you may be right....

mac62989
12-02-2011, 09:40 PM
Crap... I think you may be right....

sarcasm?

IRONFIST
12-02-2011, 10:00 PM
No sarcasm, I just did some searching after reading the post and a lot of guys are making similar power to me with less mods. I think I have the lowest hp with this cam...

Big Will
12-03-2011, 01:36 AM
Glad the numbers worked out for you!!!! I too did internal work before adding headers and saw similar results.

djfury05
12-03-2011, 04:43 AM
No sarcasm, I just did some searching after reading the post and a lot of guys are making similar power to me with less mods. I think I have the lowest hp with this cam...

Don't worry about the dyno numbers.. go to the track and get a few consistent passes and see where the trap speed is.. then we can determine if there is an issue or if its running well

blk/slvr02ss
12-03-2011, 05:49 AM
Dyno #s dont mean crap u need to go to the Track !!!! I Had a 02 Camaro SS A4 Bolt-on car that Dynoed 325 to the tires and ran 11.80@114 !!!

BOBS99SS
12-03-2011, 06:12 AM
how do you not have a lid yet lol, you will feel a gain for sure once you put one on, check craigslist i saw 3 of them on there the other day ,they were all under 40 bucks

KC Henry
12-03-2011, 08:55 AM
Don't worry about the dyno numbers.. go to the track and get a few consistent passes and see where the trap speed is.. then we can determine if there is an issue or if its running well

Dyno #s dont mean crap u need to go to the Track !!!! I Had a 02 Camaro SS A4 Bolt-on car that Dynoed 325 to the tires and ran 11.80@114 !!!

I agree, dyno queens are for bragging rights for those that don't go to the track and would rather bench race.

Take the car to the track, and then see how it performs.

Take my car for example... a stock LQ9 truck motor with an EPS cam, dyno'd only 388 rwhp through a redneck racing 4,500 stall and a TH400.

Even taking it pretty easy at the track my 2+ ton car ran 12.0@111mph... using the Wallace Racing Calculator it shows the car is making closer to 415 or so to the tire.

(Link to Calculator: http://www.wallaceracing.com/hpcalculatorquarter.php )

gtotoocool1
12-04-2011, 08:57 AM
You guys really think I can gain 13hp from just a lid? I'd love to hit that magic 400rwhp number but I don't know if it's possible. My engine mods are basically done at this point, there's a 75 shot of nitrous going in ( already have the kit ) and other then that I don't have any plans.yes,i do.the OEM airbox was designed to muffle the sound of air going into the TB,not to maximize airflow.you need to let that motor breathe!with the 243s and that cam,the engine is moving a lot more air.you took care of the exhaust,now your choke point is in the intake track.put a lid on there,and port your TB.those 2 mods should net you 15 hp,easily.
and don't focus on the dyno #s too much.every dyno reads different.the track is the real dyno.