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Originally Posted by "Z"en You can also gain torque/boost by simply putting a restrictive exhaust system. However, it will not only increase the back pressure as well as exhaust gas

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Old 04-07-2019, 01:46 PM   #1 (permalink)
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You can also gain torque/boost by simply putting a restrictive exhaust system. However, it will not only increase the back pressure as well as exhaust gas temperature but also loose top-end power.
It’s not back pressure or a restrictive exhaust that adds power. It’s all about exhaust gas scavenging. I don’t know of any serious builds that are running a stock exhaust. My Motordyne equal length long tube headers and exhaust are only going to add power, and not because they are more restrictive.

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Old 04-07-2019, 07:13 PM   #2 (permalink)
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It’s not back pressure or a restrictive exhaust that adds power. It’s all about exhaust gas scavenging. I don’t know of any serious builds that are running a stock exhaust. My Motordyne equal length long tube headers and exhaust are only going to add power, and not because they are more restrictive.

https://youtu.be/jjPeP_Nn2B4
Motordyne LTB is actually not restrictive at all. It's straight-through design with pipe diameters (1-5/8″ primaries stepped to 1.75″ to the 2.5″ merge collector) larger than the OEM one and can definitely benefit power, while at the same time decreasing EGT. A true "long-tube" header featuring equal "gas flow" length helps the car separate exhaust gas pulses well, thereby making power and better preserving torque. However there will be a whole different circumstances if you put stock catalytic converter back. You will see better boost but loose power and increase exhaust pressure as well as EGT. Moreover, the cat isn't going to last long.
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Old 04-07-2019, 07:26 PM   #3 (permalink)
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Motordyne LTB is actually not restrictive at all. It is straight through design (1-5/8″ primaries stepped to 1.75″ to the 2.5″ merge collector) and can definitely benefit power. However there will be a whole different circumstances if you put stock catalytic converter back. You will see better boost but loose power and increase exhaust pressure as well as EGT. Moreover, the cat isn't going to last long.
Yes, that’s my point and why I purchased both. It was your statement about putting a restrictive exhaust on to gain power that I don’t agree with. You now seem to be saying the opposite so I’m not sure what you really meant to say.
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Old 04-07-2019, 07:29 PM   #4 (permalink)
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Yes, that’s my point and why I purchased both. It was your statement about putting a restrictive exhaust on to gain power that I don’t agree with. You now seem to be saying the opposite so I’m not sure what you really meant to say.
I didn't say it will add power. You completely misunderstand it but that's OK. I just said it will add "boost" but loose the top-end power.
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Old 04-07-2019, 08:36 PM   #5 (permalink)
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I didn't say it will add power. You completely misunderstand it but that's OK. I just said it will add "boost" but loose the top-end power.


You did say it would add torque. Which also means it would add power.


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Old 04-07-2019, 09:07 PM   #6 (permalink)
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You did say it would add torque. Which also means it would add power.


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Oh I C. Sorry for the incomplete statement. What I meant to say is "it will increase low-end torque". I actually don't recommend doing so (putting a restrictive exhaust system back) at all for the sole purpose of increasing torque. As I mentioned previously, the increase in EGP and EGT will hinder the performance and cause potential damage to your engine especially for a car running with forced induction. From theory one will loose both "maximum" torque and power. Thanks for pointing it out.
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