LT headers
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Teching In
Joined: Apr 2004
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From: Liberty SC
LT headers Anyones car feel slower after putting on Longtubes? Mine are Hooker LTs with true duals with 1 chamber flowmasters, It might just be me, but i feels like it lost some low end torque. 
are all your spark plugs plugged in? its a possibitlity that you have two cylinders directly across from each other, that are not plugged in. so you would basicly be running a V6. there would be no misfires, and the car would be running smooth because the plugs are straight across from each other. you would just be missing a couple cylinders, which is obviosly making the car slower. just somethin you may wanna check. other than that, i dont know
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Joined: Jul 2002
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From: Pensacola, FL
You most likely lost some torque on the bottom end. The 'buttmeter' would notice that, but it can overlook tremendous gains elsewhere in the powerband. This can make your car feel slower when it is actually faster, especially if you don't have lower gears in your car.
Dave
Dave
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TECH Regular
Joined: Feb 2003
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From: Pasadena, CA
Originally Posted by ratio411
You most likely lost some torque on the bottom end. The 'buttmeter' would notice that, but it can overlook tremendous gains elsewhere in the powerband. This can make your car feel slower when it is actually faster, especially if you don't have lower gears in your car.
Dave
Dave
Originally Posted by ratio411
You most likely lost some torque on the bottom end. The 'buttmeter' would notice that, but it can overlook tremendous gains elsewhere in the powerband. This can make your car feel slower when it is actually faster, especially if you don't have lower gears in your car.
Dave
Dave
TECH Enthusiast
Joined: Jul 2002
Posts: 618
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From: Pensacola, FL
Originally Posted by jrp
show me a dyno that shows a loss of tq or hp anywhere in the powerband after the installation of LT's.
The bottom end surely would feel soggy, even if there was more power.
This would be magnified if the gears were stock and/or the driver was partial to driving in lower rpms.
You ask for a dyno, but the original post is not using a dyno, it's all buttmeter. A much less accurate device.
I am just stating what I have noticed myself in the past when dealing with parts like headers. No dynos.
Dave
Edit: On the other hand, I have also seen cars that felt slower after mods that had more torque verifiable without a dyno...
The wheels were spinning more, faster, easier, etc... but the driver could not sense this. This made for the sensation of a much slower car.
Originally Posted by ratio411
If the car went from stock manifolds and stock style cat-back, to LTs, duals, and one chamber Flows...
The bottom end surely would feel soggy, even if there was more power.
This would be magnified if the gears were stock and/or the driver was partial to driving in lower rpms.
You ask for a dyno, but the original post is not using a dyno, it's all buttmeter. A much less accurate device.
I am just stating what I have noticed myself in the past when dealing with parts like headers. No dynos.
Dave
Edit: On the other hand, I have also seen cars that felt slower after mods that had more torque verifiable without a dyno...
The wheels were spinning more, faster, easier, etc... but the driver could not sense this. This made for the sensation of a much slower car.
The bottom end surely would feel soggy, even if there was more power.
This would be magnified if the gears were stock and/or the driver was partial to driving in lower rpms.
You ask for a dyno, but the original post is not using a dyno, it's all buttmeter. A much less accurate device.
I am just stating what I have noticed myself in the past when dealing with parts like headers. No dynos.
Dave
Edit: On the other hand, I have also seen cars that felt slower after mods that had more torque verifiable without a dyno...
The wheels were spinning more, faster, easier, etc... but the driver could not sense this. This made for the sensation of a much slower car.
On The Tree
Joined: May 2004
Posts: 133
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From: Dallas
I agree...I'd say you're not creating enough back pressure for the low end going through all that exhaust. I'd wager your duals are 3 inch too. Too big. Go get 2 1/2 inch duals or better yet, have someone make you a custom 3 inch Y pipe. I have Hooker Longtubes, and I got the Hooker ORY...but soon found that it didn't flow for ****. With stock cam/heads you don't need true duals. Get you a decent flowing Y pipe that will help create the back pressure for low end torque. You'll be pleased with the results. I was.
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From: Orange Park/ Jacksonville, FL
Mine felt a little slower (on the bottom end) too, but a little stronger on the top end. either way, after I put about 150 miles on it, it seemed to pick up again. I'm pretty sure sure I need tuning, I'm running really rich. Gonna put it on the dyno soon