View Poll Results: Shorty Header Peak HP
less than 500
5
71.43%
500-600
0
0%
600-700
1
14.29%
700 +
1
14.29%
Voters: 7. You may not vote on this poll
Shorty Header HP Poll
Shorty Header HP Poll Not trying to start any wars. We all know LT's make more power. There are many of us for varying reasons that have few options when it comes to headers and passing SMOG checks.
On the Dyno my setup maxes out at 650HP / 625TQ @ 5600 RPM, boost still builds to redline (6500) but HP flatlines. There has been much speculation as to why, so in an effort to narrow down the actual cause I thought I would gather as much real world data as possible. I am starting to think the 1 5/8th primaries on my JBA shorties simply have reached their limit on CFM capacity???
Please check your HP range, and feel free to post up your setup.
On the Dyno my setup maxes out at 650HP / 625TQ @ 5600 RPM, boost still builds to redline (6500) but HP flatlines. There has been much speculation as to why, so in an effort to narrow down the actual cause I thought I would gather as much real world data as possible. I am starting to think the 1 5/8th primaries on my JBA shorties simply have reached their limit on CFM capacity???
Please check your HP range, and feel free to post up your setup.
Last edited by b727pic; Feb 16, 2011 at 07:58 PM.
Not familiar with "y" pipe setups? I currently have dual 2.5" running through Cat-less mids, and Magnaflow catback. Previously I had a Corsa Touring on my old 408 setup, had the same issue. The magnaflow, outflows the Corsa setup by quite abit, yet here I am with the same issue. If its in the exhaust, its got to be the manifolds themselves.
Oh gotcha I didnt realize that, couldn't you put preformance cats in the mids then? What im getting at is yeah LTs are going to get rid of the "weak link" specialy in your case! If its due to emissions couldnt cats somewhere in the exhaust be enough for you to get LTs, pass, and solve your problem?
Oh gotcha I didnt realize that, couldn't you put preformance cats in the mids then? What im getting at is yeah LTs are going to get rid of the "weak link" specialy in your case! If its due to emissions couldnt cats somewhere in the exhaust be enough for you to get LTs, pass, and solve your problem?
You just said you had shorties with cats, then you have catless mids? Honestly being that I live in CA unless you are being stupid you wont get bothered and if you have cats even if they aren't in the right place. Yes the shorties are definitely holding you back. If you have mids what you can do for a little more power is port the primaries (assuming you have MAC mids) and cut off the flange and have a v band clamp welded on to it. That way you could run dual 3 inch midpipes to a good y merge to the catback
Honestly being that I live in CA unless you are being stupid you wont get bothered and if you have cats even if they aren't in the right place. Yes the shorties are definitely holding you back. If you have mids what you can do for a little more power is port the primaries (assuming you have MAC mids) and cut off the flange and have a v band clamp welded on to it. That way you could run dual 3 inch midpipes to a good y merge to the catback
The whole point of this thread is to see how far shorty headers have been pushed to succesfully
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TECH Resident
Joined: Feb 2002
Posts: 843
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From: Roseville, Ca.
I'm sorry I don't have an answer to your question of power limits, but JBA has 1 3/4 primaries for the vette, but none for the Fbody or GTO as far as I know, no one does. It would seem like a guy could get pretty creative with a custom set or adapted vette headers with a CARB plate tacked on then recoated. (but that would just be wrong 
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