BBK Shorty Header Dyno Test Today!!!

[DTM]

didn't the DT's make a ton of power????

[iBK3000]

Um, if this is the case, I am going to return my Doug Thorleys when they show up

[Jason 98 TA]

LOL I did come out & say it & everyone thought I was a butt! I dyno tested run 2 & 4 in 4th gear & it was almost identical results. Just so you guys know I even reset the pcm for 2 & 4 to make sure the computer wasn't in low timing for either setups.

Guys this isn't really suprising at all, it's the same results we've seen several times with LS1 cars.

It has nothing to do with BBK screwing up like someone said, I'd pretty much eat crap if ANYBODY had a good working shorty!! :( :(

[Jason 98 TA]

Do that install with before & after results iBK, I bet you get the same data :( :(

[axis]

Originally Posted by Jason 98 TA

LOL I did come out & say it & everyone thought I was a butt! I dyno tested run 2 & 4 in 4th gear & it was almost identical results. Just so you guys know I even reset the pcm for 2 & 4 to make sure the computer wasn't in low timing for either setups.

Guys this isn't really suprising at all, it's the same results we've seen several times with LS1 cars.

It has nothing to do with BBK screwing up like someone said, I'd pretty much eat crap if ANYBODY had a good working shorty!! :( :(

There are a few of us that believed you and Ted as well. It's just that there are a TON of people that can't get it through their skulls that a manufacturer would pad their results or just plain lie about them. That's why we appreciate you guys for showing us the REAL results.

Look on the bright side guys, they are CA legal.

[2010 4 DW]

1 3/4 Shorties for sure will make power over the factory manifolds. The test would need to be done on a M6 as the dyno operator is not going to roll into the throttle the same every time on a auto car.

I have seen 45-50RWHP with longtubes/Tune and I have also seen 13-15rwhp with just 1 3/4 JBA Shorties. I but if you added the shorties and a pair of mids you might pick up some good power.

I know with my old GTO I had 1 5/8 shorties and non-catted mids and I made 6rwhp less that my buddy that had the same mods just 1 3/4 Longtubes and mids.

The cats are the main restriction on these cars and I am glad companies like JBA sell the catted and non catted mids so if you don't want headers you can just buy the mids.

DW

[wbt]

I am also sure not all shorties are made equal. I would be interested in seeing the DT's and JBA's tested. Anyone wanna volunteer?

[axis]

Originally Posted by 2010 4 DW

1 3/4 Shorties for sure will make power over the factory manifolds. The test would need to be done on a M6 as the dyno operator is not going to roll into the throttle the same every time on a auto car.

I have seen 45-50RWHP with longtubes/Tune and I have also seen 13-15rwhp with just 1 3/4 JBA Shorties. I but if you added the shorties and a pair of mids you might pick up some good power.

I know with my old GTO I had 1 5/8 shorties and non-catted mids and I made 6rwhp less that my buddy that had the same mods just 1 3/4 Longtubes and mids.

The cats are the main restriction on these cars and I am glad companies like JBA sell the catted and non catted mids so if you don't want headers you can just buy the mids.

DW

You've SEEN 15whp gain on a 2010 Camaro with JBA shorties? If you have, please post up the proof. I'm sure many on here would love to see it.

Comparing one car to the next without a baseline run means absolutely nothing. There's documented 10-20whp difference between identical, completely stock cars, on the same dyno.

[NinoSS]

Originally Posted by 2010 4 DW

1 3/4 Shorties for sure will make power over the factory manifolds. The test would need to be done on a M6 as the dyno operator is not going to roll into the throttle the same every time on a auto car.

I have seen 45-50RWHP with longtubes/Tune and I have also seen 13-15rwhp with just 1 3/4 JBA Shorties. I but if you added the shorties and a pair of mids you might pick up some good power.

I know with my old GTO I had 1 5/8 shorties and non-catted mids and I made 6rwhp less that my buddy that had the same mods just 1 3/4 Longtubes and mids.

The cats are the main restriction on these cars and I am glad companies like JBA sell the catted and non catted mids so if you don't want headers you can just buy the mids.

DW

The cats are the restriction...

I have cut open the OEM cats (all four), and manually removed the material inside. I will have dyno proof on thursday that this is the case... Stay tuned...

[BabyHauler]

This is disappointing according to the latest test data of the products I was going to intall on my car (cold air kit and shorty headers) My car will be slower then when i bought it :(

[BabyHauler]

All the dyno shows is that all other things being stock that the stock exhaust manifolds are not the "weak link" in the air goes in goes out equation.
If you do more mods to your car like cold air and cat back then the shorties will start to prove their worth. Mods to cars are usally complimentary and not stand alone end all be all.
One last thing as we saw in the Cold air shoot out with GM high tech small changes in temp/humidity can change HP so maybe the shorties arent as bad as this one dyno shows.

[flht99b]

I haven't met a person yet that drives a dyno. All these "tests" make good reading but don't amount to anything in real world conditions, unless you have a dyno that drives down the road and has XM radio. I can tell you without reservation, BBK SS shorties, CAI cai and the GMPP "street" axle back have made a significant power increase to my LS3 SS/RS. The cats are the corks in making real HP, pull them, re-tune and you'll have significantly more power and no warranty. Ed M.

[2SSRS-CGM]

Originally Posted by JANNETTYRACING

Exactly What I expected, I just didn't want to come out an say it.

I have a set of DT's sitting in my closet at home; I'm leaving Iraq in about two weeks. I'll look into shipping if you wouldn't mind throwing them on your test-maro. At this point I'm just tired of all the unknowns. I would spend the money just so the C5 community could get a definitive answer. If I were in CT, I would come over to your shop and help you through the process...

I honestly don't want to spend time driving 45 mins to my dyno guy to get a baseline, installing the DT's, and driving back to re-dyno.

I'll be even more pissed if I lose HP, and have to reinstall the stock manifolds....

[Jon@Texas-Speed]

There would probably be some power to be made with an x-pipe change but you still wouldn't be where a LT header will get you. These same tests have been done with the same kind of results from way back in '97 when the LS1 first came out in the Corvette. Shorty headers alone do not make power. Honestly, I can't see an axle back picking up much without the addition of an x-pipe on these cars. Sure there might be a little difference between brands but just like you see on LT headers, the differences are typically within 5 RWHP, not the 20 RWHP that everyone likes to believe.

Jon