Why can't I spin the tires off the line
#47
Traction control system.
What size tires do you have? Mine would light up the stock 225s easily but these aren't really muscle cars. With my 265s it strains to spin them at a dry stop.
With 2.5" piping, these motors don't create enough back pressure down low. You should have noticed a loss of low-end power and bogging down when you went with such a large exhaust. 2 1/4" piping will help even it out.
Also, I stopped doing burn outs because tires, gas, and strained drivetrain components are expensive when your parents don't pay for them anymore.
What size tires do you have? Mine would light up the stock 225s easily but these aren't really muscle cars. With my 265s it strains to spin them at a dry stop.
With 2.5" piping, these motors don't create enough back pressure down low. You should have noticed a loss of low-end power and bogging down when you went with such a large exhaust. 2 1/4" piping will help even it out.
Also, I stopped doing burn outs because tires, gas, and strained drivetrain components are expensive when your parents don't pay for them anymore.
#48
Lexus Test Driver
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Ok for god's sake. Some SC400's come with traction control and some don't. If you do have it you will have a button next to the shifter and it will say TRAC in your engine bay. If you don't have a button then you DON'T have it! No one tried to remove it or whatever dumb idea the guy earlier posted. The 2.5 inch piping is hurting your performance, especially down low. You need to keep it at 2.25 inches. Use TCS for traction control system and TC for torque converter, so you stop confusing everybody. This is all pretty simple stuff that has been discussed NUMEROUS times. You are a new member and need to learn to use the search feature. A majority of your questions can be answered by researching them.
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#51
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Ok for god's sake. Some SC400's come with traction control and some don't. If you do have it you will have a button next to the shifter and it will say TRAC in your engine bay. If you don't have a button then you DON'T have it! No one tried to remove it or whaEtever dumb idea the guy earlier posted. The 2.5 inch piping is hurting your performance, especially down low. You need to keep it at 2.25 inches. Use TCS for traction control system and TC for torque converter, so you stop confusing everybody. This is all pretty simple stuff that has been discussed NUMEROUS times. You are a new member and need to learn to use the search feature. A majority of your questions can be answered by researching them.
#52
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On the piping, does it make any difference what size my piping is considering that i am using the stock headers and that there is still a foot or two of stock piping after the cat? All of the 2.5" pipe is right before the x pipe and between the x pipe and the mufflers. My understanding after reading more is that if the pipe at any point post cat is 2.25" then the piping is in effect 2.25"? Is this correct?
#53
Instructor
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I literally cringe everytime someone still spews the words "motor needs backpressure."
I'm gonna leave this here.
http://www.gomog.com/allmorgan/exhaustbackpressure.html
Dual 2.25" piping will choke off a 4.0L motor in the top end. It's cutting it too close as far as CFM requirements go (assuming ~400cfm flow on a 4L motor spinning 6500rpm at VE of 85%). Dual 2.5" is just fine.
And yes, the minimum diameter of your exhaust is the bottleneck that limits CFM. However, transitions screw with velocity and are not a good idea unless you make them go larger the further back you go.
I'm gonna leave this here.
http://www.gomog.com/allmorgan/exhaustbackpressure.html
Dual 2.25" piping will choke off a 4.0L motor in the top end. It's cutting it too close as far as CFM requirements go (assuming ~400cfm flow on a 4L motor spinning 6500rpm at VE of 85%). Dual 2.5" is just fine.
And yes, the minimum diameter of your exhaust is the bottleneck that limits CFM. However, transitions screw with velocity and are not a good idea unless you make them go larger the further back you go.
#54
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I literally cringe everytime someone still spews the words "motor needs backpressure."
I'm gonna leave this here.
http://www.gomog.com/allmorgan/exhaustbackpressure.html
Dual 2.25" piping will choke off a 4.0L motor in the top end. It's cutting it too close as far as CFM requirements go (assuming ~400cfm flow on a 4L motor spinning 6500rpm at VE of 85%). Dual 2.5" is just fine.
And yes, the minimum diameter of your exhaust is the bottleneck that limits CFM. However, transitions screw with velocity and are not a good idea unless you make them go larger the further back you go.
I'm gonna leave this here.
http://www.gomog.com/allmorgan/exhaustbackpressure.html
Dual 2.25" piping will choke off a 4.0L motor in the top end. It's cutting it too close as far as CFM requirements go (assuming ~400cfm flow on a 4L motor spinning 6500rpm at VE of 85%). Dual 2.5" is just fine.
And yes, the minimum diameter of your exhaust is the bottleneck that limits CFM. However, transitions screw with velocity and are not a good idea unless you make them go larger the further back you go.
#55
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OK, so based on this article, I'd say my exhaust is just fine, until I build some headers. It starts out through high flow cats goes into 2.25" piping, transitions to 2.5" to an x-pipe and through straight through mufflers. It doesn't sound like I need to change anything.
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