Headers
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Are there gains to be had by switching to larger diameter headers? Absolutely. But this is no free lunch; you will make more power up top at the cost of reduced low end torque... Since centrifugal blowers make very little low RPM boost and TONS of top end, I consider the smaller headers to be a good compromise in making a flatter torque curve and a fatter power band.
Unless peak numbers are your thing... In which case the bigger headers will give you a larger peak.
I too am curious if anyone has tried it though!
Thread Starter
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Well I'm at 597RWHP with the 1 3/4" headers and that's with the larger 3.8" pulley and pump gas. I am sure I could do heads, cams, a smaller pulley, a FAST intake manifold and methanol injection and make much more power (maybe 50 - 70WHP more, completely limited by the blower) still on the Kooks 1 3/4".
Are there gains to be had by switching to larger diameter headers? Absolutely. But this is no free lunch; you will make more power up top at the cost of reduced low end torque... Since centrifugal blowers make very little low RPM boost and TONS of top end, I consider the smaller headers to be a good compromise in making a flatter torque curve and a fatter power band.
Unless peak numbers are your thing... In which case the bigger headers will give you a larger peak.
I too am curious if anyone has tried it though!
Are there gains to be had by switching to larger diameter headers? Absolutely. But this is no free lunch; you will make more power up top at the cost of reduced low end torque... Since centrifugal blowers make very little low RPM boost and TONS of top end, I consider the smaller headers to be a good compromise in making a flatter torque curve and a fatter power band.
Unless peak numbers are your thing... In which case the bigger headers will give you a larger peak.
I too am curious if anyone has tried it though!
through the whole curve than the 1 7/8's. Also Kooks' says go to 1 7/8
when hitting over 500 rwhp.Any advantage the 1 3/4 have will be gone by 3000 rpm is my guess!
Safety Car
Joined: Oct 2001
Posts: 4,945
Likes: 0
From: Dallas/Valley Ranch TEXAS!!!
once again guys, I'm not saying that there aren't gains to be had by the switch... but I'm still on 1 3/4 primaries... So we know they are good to 750+rwhp...
I just think the money spent on the larger headers could be spent on smarter HP... With that said... I'm not knocking what you have made the decision to do, and I'm anxious to see your results
I just think the money spent on the larger headers could be spent on smarter HP... With that said... I'm not knocking what you have made the decision to do, and I'm anxious to see your results
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
once again guys, I'm not saying that there aren't gains to be had by the switch... but I'm still on 1 3/4 primaries... So we know they are good to 750+rwhp... I just think the money spent on the larger headers could be spent on smarter HP... With that said... I'm not knocking what you have made the decision to do, and I'm anxious to see your results
I just think the money spent on the larger headers could be spent on smarter HP... With that said... I'm not knocking what you have made the decision to do, and I'm anxious to see your resultsLooking forward to seeing how the switch works out for Rock'n Blue. I too saw the post where the ZR-1 lost torque with the 1 3/4", but that is a very different setup using a positive displacement blower; what works there may not directly translate to something that works well with us centrifugal guys...
