2" headers...any downsides ?
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From: Norn Iron
2" headers...any downsides ? I figured its better to ask here, as opposed to FI.
382, Edelbrock 215 heads, 224/230 cam, Im guessing at around 800+rwhp, and dual DIY 3" systems with an X-pipe
Anyway.
My current headers are modifed 1 3/4" Pacesetters. Modified to fit my car ( basically 2 tubes re-shaped on right side of car, and collector tubes shortened a couple of inches on both sides of car.
I want a nice set of stainless headers made, but the people in the UK can only bend either 1 3/4" or 2" tubing. Ideally I had wanted 1 7/8"
I assume that there should be no major downsides to 2" diam headers ?
All into a 3" collector still.
382, Edelbrock 215 heads, 224/230 cam, Im guessing at around 800+rwhp, and dual DIY 3" systems with an X-pipe
Anyway.
My current headers are modifed 1 3/4" Pacesetters. Modified to fit my car ( basically 2 tubes re-shaped on right side of car, and collector tubes shortened a couple of inches on both sides of car.
I want a nice set of stainless headers made, but the people in the UK can only bend either 1 3/4" or 2" tubing. Ideally I had wanted 1 7/8"
I assume that there should be no major downsides to 2" diam headers ?
All into a 3" collector still.
the only problem you could possibly run into would be exhaust gas velocity. if the primaries are too large you will lose some velocity, hypothetically.
but with all the **** it looks like you have, i think you'll be ok.
but with all the **** it looks like you have, i think you'll be ok.
You could buy some pre-bent tubing and weld it together to make the first section of the primaries, then step it to 2". You could also just piece together the whole damn things from 1-7/8 tubing.
Contact Kooks, I'm sure they can help you out bigtime. ------>
Contact Kooks, I'm sure they can help you out bigtime. ------>
Thread Starter
9 Second Club
Joined: Nov 2003
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From: Norn Iron
Originally Posted by TheBlurLS1
You could buy some pre-bent tubing and weld it together to make the first section of the primaries, then step it to 2". You could also just piece together the whole damn things from 1-7/8 tubing.
Contact Kooks, I'm sure they can help you out bigtime. ------>
Contact Kooks, I'm sure they can help you out bigtime. ------>
But when you have to buy to try, and you are about 4000 miles away from any suppliers....it aint easy.
I know I could build them myself, I just dont want that hassle. And piece together, no matter how hard you try, will end up with weld contamination on the inside. Id guess that would restrict any 1 7/8" setups made, so may as well just stick with 1 3/4" with no weld intrusion.
Tha ARH headers also look good, where the front pipe, turns in high and tight to the block, to the rear. Not sure about the 2nd tube though. It might be very close to my steering. Nice headers though.
The ARH left side looks as if it would hit my X-member though.
Kooks left side looks as if it will clear just fine, as their tubes meet at the bottom further back.
I don't know why you guys are talking about backpressure....No one understands it apparently. Plus... "Ysi"... he is not naturally aspirated. He doesnt need exhaust velocity or scavenging effects being that he is supercharged. He is not going to have a problem with low end grunt either. He is almost running 9's...Ask yourself if you think that he has a problem leaving the line? Also, being that it is a 6 speed. It is not as crucial to the process when you are FI.
Last edited by orangeapeel; Feb 10, 2007 at 10:54 AM.
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Originally Posted by orangeapeel
I don't know why you guys are talking about backpressure....No one understands it apparently. Plus... "Ysi"... he is not naturally aspirated. He doesnt need exhaust velocity or scavenging effects being that he is supercharged. He is not going to have a problem with low end grunt either. He is almost running 9's...Ask yourself if you think that he has a problem leaving the line? Also, being that it is a 6 speed. It is not as crucial to the process when you are FI.
I think the 2" would be ok.
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9 Second Club
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From: Norn Iron
Originally Posted by orangeapeel
I don't know why you guys are talking about backpressure....No one understands it apparently. Plus... "Ysi"... he is not naturally aspirated. He doesnt need exhaust velocity or scavenging effects being that he is supercharged. He is not going to have a problem with low end grunt either. He is almost running 9's...Ask yourself if you think that he has a problem leaving the line? Also, being that it is a 6 speed. It is not as crucial to the process when you are FI.
.
If there were no gains to be had up top from 2", then I'll happily stick with the smaller headers, for any low rpm help they might give.
Being a manual, low rpm useage is important to me, as it is primarily a road car.
I wouldnt say I have a problem leaving the line, I just dont launch as hard as some others, for a variety of reasons. Im working on strengthening the drivetrain though, so I can launch harder with confidence. It isnt a stripped out trailered racer though. It has to take me and occupants circa 7-800 mile round trips when racing....
When racing, Im typically above 5000rpm ( say 5-7k ) so thats where I want the most power of course.
But all round, from idle is important to me. Hence the smallish cam and relatively small heads.
As soon as I get my car back I'm going to switching my exaust up. I currently have SW Lt's with their y pipe. Its a 2.5 inch. I'll be going to Kooks 1 3/4 stepped to 1 7/8 and a 3" Y. The dyno should tell the tale of the torque curve and how its effected. I'll post as soon as I get it done. It should give some good real world data for you even though itsnot the exact setup you have. Unless of course you get done first with your project.
for the record...
i switched from pacesetters to kooks 1 7/8 -2 inch.
I DID NOT LOSE ANY low end. It feels so much better down low actually. I gained over 40whp just on motor switching to these and a fast 90/90
i switched from pacesetters to kooks 1 7/8 -2 inch.
I DID NOT LOSE ANY low end. It feels so much better down low actually. I gained over 40whp just on motor switching to these and a fast 90/90
