Why is my torque so low?
06-10-2010, 11:49 AM
#1
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Why is my torque so low? I dynoed 310 rwhp and 246 rwtq about three weeks ago. The car has 3" cat-back, longtubes and air lid. Not sure what brands tho. Other than those three mods the car is a stock 99 ls1 camaro w/m6 and 3.42 gears.
With the exhaust cutout plate off the car dynoed 326 rwhp and 195 rwtq and with the air filter and cutout plate off it dynoed 329 rwhp and 190 rwtq.
I know that with the exhaust cutout plate off I would lose low end. But it's like I never had any to begin with.
The drivers side cat has about a 1 1/2"-2" crack in it. Could that be causing the low torque numbers.
I gotta go so I will check back later. Thanx for any input.
With the exhaust cutout plate off the car dynoed 326 rwhp and 195 rwtq and with the air filter and cutout plate off it dynoed 329 rwhp and 190 rwtq.
I know that with the exhaust cutout plate off I would lose low end. But it's like I never had any to begin with.
The drivers side cat has about a 1 1/2"-2" crack in it. Could that be causing the low torque numbers.
I gotta go so I will check back later. Thanx for any input.
06-10-2010, 11:31 PM
#3
There is something wrong with their dyno. There is nothing wrong with your car.
Here's why: HP = TQ * RPM / 5252
Stock LS1 is rated 310 @ 5200 for hp. So your peak is 5200. Lets say the long tubes etc brought it up to 5400. I'm being generous but making a point. To make 329hp at 5400 rpm, you needed 320 ft/lbs of torque. And your torque peak is not even at 5400, it's a lot closer to the 4000 rpm a stock LS1 makes, where your torque is higher than 320, probably more like 350.
On another note, you don't lose bottom end from long tubes unless they are something ridiculously big for your combo like 2" primaries on a stock motor. A cut out will never lose torque because engines hate back pressure and generally a cutout relieves it (but never adds to it). The less energy spent pumping exhaust gases out, the more energy gets to your rear wheels.
Here's why: HP = TQ * RPM / 5252
Stock LS1 is rated 310 @ 5200 for hp. So your peak is 5200. Lets say the long tubes etc brought it up to 5400. I'm being generous but making a point. To make 329hp at 5400 rpm, you needed 320 ft/lbs of torque. And your torque peak is not even at 5400, it's a lot closer to the 4000 rpm a stock LS1 makes, where your torque is higher than 320, probably more like 350.
On another note, you don't lose bottom end from long tubes unless they are something ridiculously big for your combo like 2" primaries on a stock motor. A cut out will never lose torque because engines hate back pressure and generally a cutout relieves it (but never adds to it). The less energy spent pumping exhaust gases out, the more energy gets to your rear wheels.
Last edited by Paint_It_Black; 06-10-2010 at 11:43 PM.
06-11-2010, 01:22 AM
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There is something wrong with their dyno. There is nothing wrong with your car.
Here's why: HP = TQ * RPM / 5252
Stock LS1 is rated 310 @ 5200 for hp. So your peak is 5200. Lets say the long tubes etc brought it up to 5400. I'm being generous but making a point. To make 329hp at 5400 rpm, you needed 320 ft/lbs of torque. And your torque peak is not even at 5400, it's a lot closer to the 4000 rpm a stock LS1 makes, where your torque is higher than 320, probably more like 350.
On another note, you don't lose bottom end from long tubes unless they are something ridiculously big for your combo like 2" primaries on a stock motor. A cut out will never lose torque because engines hate back pressure and generally a cutout relieves it (but never adds to it). The less energy spent pumping exhaust gases out, the more energy gets to your rear wheels.
Here's why: HP = TQ * RPM / 5252
Stock LS1 is rated 310 @ 5200 for hp. So your peak is 5200. Lets say the long tubes etc brought it up to 5400. I'm being generous but making a point. To make 329hp at 5400 rpm, you needed 320 ft/lbs of torque. And your torque peak is not even at 5400, it's a lot closer to the 4000 rpm a stock LS1 makes, where your torque is higher than 320, probably more like 350.
On another note, you don't lose bottom end from long tubes unless they are something ridiculously big for your combo like 2" primaries on a stock motor. A cut out will never lose torque because engines hate back pressure and generally a cutout relieves it (but never adds to it). The less energy spent pumping exhaust gases out, the more energy gets to your rear wheels.
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06-11-2010, 12:28 PM
#8
There is something wrong with their dyno. There is nothing wrong with your car.
Here's why: HP = TQ * RPM / 5252
Stock LS1 is rated 310 @ 5200 for hp. So your peak is 5200. Lets say the long tubes etc brought it up to 5400. I'm being generous but making a point. To make 329hp at 5400 rpm, you needed 320 ft/lbs of torque. And your torque peak is not even at 5400, it's a lot closer to the 4000 rpm a stock LS1 makes, where your torque is higher than 320, probably more like 350.
On another note, you don't lose bottom end from long tubes unless they are something ridiculously big for your combo like 2" primaries on a stock motor. A cut out will never lose torque because engines hate back pressure and generally a cutout relieves it (but never adds to it). The less energy spent pumping exhaust gases out, the more energy gets to your rear wheels.
Here's why: HP = TQ * RPM / 5252
Stock LS1 is rated 310 @ 5200 for hp. So your peak is 5200. Lets say the long tubes etc brought it up to 5400. I'm being generous but making a point. To make 329hp at 5400 rpm, you needed 320 ft/lbs of torque. And your torque peak is not even at 5400, it's a lot closer to the 4000 rpm a stock LS1 makes, where your torque is higher than 320, probably more like 350.
On another note, you don't lose bottom end from long tubes unless they are something ridiculously big for your combo like 2" primaries on a stock motor. A cut out will never lose torque because engines hate back pressure and generally a cutout relieves it (but never adds to it). The less energy spent pumping exhaust gases out, the more energy gets to your rear wheels.
