Manifold For Supercharged Car
01-28-2006, 01:40 AM
#5
1.5 BAR
Thread Starter
Join Date: Feb 2005
Posts: 691
Re: Manifold For Supercharged Car
Originally Posted by 90dx
What is the theory behind the two step?Not doughting just curious.Looks good though nice work.
Exhaust scavanging is like a micro-vacuum created outside the exhaust port in the manifold. At a certain velocity in the exhaust flow it gets strong enough to where it actually sucks out exhaust gas. At this point you see a jump in power. So by changing the position of the step, you can change the window of scavanging to occur wherever you need it (low rpm, mid range, top end).
To get this right, there is a lot of math involved which I havent learned yet. Hopefully I explained the idea behind a step correctly. If I said anything wrong, feel free to correct me. In this manifold, I just stuck it in there and hopefully we'll see some sort of power increase.
01-28-2006, 04:14 AM
#6
3.0 BAR
Join Date: Jul 2004
Posts: 4,029
Re: Manifold For Supercharged Car
No that actually made perfect sense.That sounds like basically a trial and error on the dyno to see where the power is going and what gains are made.I guess that explains why high end race headers for all motor Hondas are so expensive as R&D is expensive and time consuming.You sell headers or is this a one off thing for a customer/friend?I have a buddy with a LS/Vtec 92 Teg we are doing the all motor thing on as the compression is to high for boost and we have been trying to find a reasonable priced header that makes worthwile gains.
01-28-2006, 08:25 PM
#9
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re: Manifold For Supercharged Car
Where do you put the turbo? 
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01-29-2006, 10:40 PM
#10
1.5 BAR
Join Date: Jan 2005
Posts: 1,440
Re: Manifold For Supercharged Car
Originally Posted by myshtern
Its not easy to explain, but I'll give it a go. Each exhaust pulse sends out two waves, a fast one and a slow one. The fast one gets to the collector and bounces back like sound wave. At that point it becomes a reversion wave and hits the oncoming exhaust flow. The step stops the reversion wave before it gets to the smallest tube. This increases the window for exhaust scavanging to occur.
Exhaust scavanging is like a micro-vacuum created outside the exhaust port in the manifold. At a certain velocity in the exhaust flow it gets strong enough to where it actually sucks out exhaust gas. At this point you see a jump in power. So by changing the position of the step, you can change the window of scavanging to occur wherever you need it (low rpm, mid range, top end).
To get this right, there is a lot of math involved which I havent learned yet. Hopefully I explained the idea behind a step correctly. If I said anything wrong, feel free to correct me. In this manifold, I just stuck it in there and hopefully we'll see some sort of power increase.
Exhaust scavanging is like a micro-vacuum created outside the exhaust port in the manifold. At a certain velocity in the exhaust flow it gets strong enough to where it actually sucks out exhaust gas. At this point you see a jump in power. So by changing the position of the step, you can change the window of scavanging to occur wherever you need it (low rpm, mid range, top end).
To get this right, there is a lot of math involved which I havent learned yet. Hopefully I explained the idea behind a step correctly. If I said anything wrong, feel free to correct me. In this manifold, I just stuck it in there and hopefully we'll see some sort of power increase.
just go on ebay and look up a REAL type-R header, or even the DC Sports type R. both 4-1 with 2.5in collector near the end of the header. i've heard its possibly the best header you can get for a honda.
