To heat rap my down pipe or not to? your thaughts
Evolving Member
Joined: Sep 2003
Posts: 369
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Originally posted by mhgsx
Ok, I'll bite.
The problem with your 'horn' theory is that you're causing the exhaust pulses to lose energy as the propigate down the pipe. How? Because that pulse has a set amount of energy. Now you're asking it to expend it's energy to fill up a larger and larger space. ( assuming you get a perfect taper like a horn) Not to mention that the exhaust pulse is already losing energy due to transfer of heat to the piping. Basically, by increasing the exhaust diameter as you go further from the turbo, you're actually increasing backpressure as pulse after pulse hits each other as it goes down the piping.
I would rather go from a 3" downpipe, into a 3" cat-con, then into a tapering 2.5" catback.
Ok, I'll bite.
The problem with your 'horn' theory is that you're causing the exhaust pulses to lose energy as the propigate down the pipe. How? Because that pulse has a set amount of energy. Now you're asking it to expend it's energy to fill up a larger and larger space. ( assuming you get a perfect taper like a horn) Not to mention that the exhaust pulse is already losing energy due to transfer of heat to the piping. Basically, by increasing the exhaust diameter as you go further from the turbo, you're actually increasing backpressure as pulse after pulse hits each other as it goes down the piping.
I would rather go from a 3" downpipe, into a 3" cat-con, then into a tapering 2.5" catback.
Wouldn't the velocity increase or at least not slow down as the piping tapers down? A similar concept would be intake runner design. Most taper down into the head.
And I never said to use a 2.5" downpipe. I would still use a 3" one to help maximize the pressure differential between the downpipe and exhaust manifold.
And I would still use a 3" cat since the cat represents the most backpressure source for the entire exhaust.
And I never said to use a 2.5" downpipe. I would still use a 3" one to help maximize the pressure differential between the downpipe and exhaust manifold.
And I would still use a 3" cat since the cat represents the most backpressure source for the entire exhaust.
I wouldnt worry about needing to heat wrap the pipe. I have there full 3in turbo back unit and did not heatwrap any of it. I have not expereinced any problem such as over heating the oil or anything of that nature (I have an oil temp sensor by the oil filter).
Evolving Member
Joined: Sep 2003
Posts: 369
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Originally posted by x7eVoLuTiOn7x
I was also planning to wrap my apexi 3" downpipe to lessen the heat going to the engine.
Question is would wrapping it cause the downpipe to rust or crack when you get it wet all the time?
I was also planning to wrap my apexi 3" downpipe to lessen the heat going to the engine.
Question is would wrapping it cause the downpipe to rust or crack when you get it wet all the time?
