exhaust
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Joined: Jun 2005
Posts: 2,660
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From: England
I remember reading something about cones from a chap at LG (it was a Corvette forum). They used to make their race headers (proper race not for retail) like it but they where very time consuming and expensive. They did show gains but only slightly, and the cost and hassel for the extra bhp was not worth it so they stopped.
I'm assuming this is what you are referring too, I'll try and find the post from LG.
EDIT:
Here's the post from LG, it also highlights how good A Y pipe setup is also (they convert from and X to a Y for their race cars
)
I'm assuming this is what you are referring too, I'll try and find the post from LG.
EDIT:
Here's the post from LG, it also highlights how good A Y pipe setup is also (they convert from and X to a Y for their race cars
)
Originally Posted by LG Motorsports
When we used a hand built Merge collector they cost us $450 each. that made the original headers cost $2500 per set without cats.
When we made the deal with Borla we specified a production, machine made collector to get the price of the complete set of headers down but we did not want to compromise the quality or power of our headers.
When we got our first set of prototype headers, we switched back and forth from the Production Merge collector to the Hand built collector and there was less than 2 hp difference. That is why we chose to supply the collector the way we do.
The alternative was to cheap out and use a plain stamped collector that had no relationship to a Merge collector. Or do what we did. We know from dyno testing that the Merge collector built the way we have them built causes a "venturi" effect where the collector necks down to 2 1/2" before the tapered transition up to the 3" out let. It is this "Merge down and Transition up at a specific angle that provides the effect that has come to be known as a "Merge" Collector.
The cone in the center is only 1 or 2 hp and since the full Merge collector that we use provided most of the gains without it, we chose to leave it and the other $900 out of the equation.
Again, the results speak for themself. We use our LG Pro Long Tube headers in our World Challenge race car exactly the way you get them for your street car. The only difference is that we turn the X pipe into a Y pipe and exit the exhaust out the side of the car, over the passenger floor and through the right side frame rail and rocker pannel.
Our headers run down the straight equal to the fastest Cadillac CTSv and every fast Corvette runs our LG headers.
We could get a couple more hp if we did some extensive exhaust testing on Merge angles in and cone angles out but the cost is prohibitive.
Thanks
Lou Gigliotti LGM
When we made the deal with Borla we specified a production, machine made collector to get the price of the complete set of headers down but we did not want to compromise the quality or power of our headers.
When we got our first set of prototype headers, we switched back and forth from the Production Merge collector to the Hand built collector and there was less than 2 hp difference. That is why we chose to supply the collector the way we do.
The alternative was to cheap out and use a plain stamped collector that had no relationship to a Merge collector. Or do what we did. We know from dyno testing that the Merge collector built the way we have them built causes a "venturi" effect where the collector necks down to 2 1/2" before the tapered transition up to the 3" out let. It is this "Merge down and Transition up at a specific angle that provides the effect that has come to be known as a "Merge" Collector.
The cone in the center is only 1 or 2 hp and since the full Merge collector that we use provided most of the gains without it, we chose to leave it and the other $900 out of the equation.
Again, the results speak for themself. We use our LG Pro Long Tube headers in our World Challenge race car exactly the way you get them for your street car. The only difference is that we turn the X pipe into a Y pipe and exit the exhaust out the side of the car, over the passenger floor and through the right side frame rail and rocker pannel.
Our headers run down the straight equal to the fastest Cadillac CTSv and every fast Corvette runs our LG headers.
We could get a couple more hp if we did some extensive exhaust testing on Merge angles in and cone angles out but the cost is prohibitive.
Thanks
Lou Gigliotti LGM
Last edited by 300bhp/ton; Apr 5, 2006 at 04:24 AM.
