Increasing Exhaust Efficiency -- ideas being sought

[NJT 5573]

My 92 is straight pipe. It is not noisy and I got rid of a ton of heat, especially around the transmission. Probably not for everyone, but I would not have it any other way.

This also eliminates the back pressure issue and in turn eliminates the need for an aftercooler.

[Brian Diehl]

My 92 is straight pipe. It is not noisy and I got rid of a ton of heat, especially around the transmission. Probably not for everyone, but I would not have it any other way.

This also eliminates the back pressure issue and in turn eliminates the need for an aftercooler.

How loud is this setup?  My existing muffler is not what you would call "quiet"!

[JohnEd]

Brian,

I had the same thought as Stan.  Turn your muf around and get in the front with a single 180 or two 90's.  The ex would then be a little further to the front of the bus with a single 90 but thats no biggie.

My REAL question is "just how much back pressure do you have?"  The muf flow is speced with 1, 2, or 3 inches of Hg.  OK, just where are you?  I know that all those bends are really to be avoided....no question.  BUT, if you have no appreciable back pressure you are picking fly shxx from pepper....maybe.  At any rate I would really like to know what the back pressure is so I could access how much improvement I have created if I change ANYTHING.  I hate that part where you hear "I think it was PRETTY bad...and now I think it is MUCH better.  Sure SEEMS to be STRONGER".  WRETCH!

You have done the absolutely best engine swap I can even imagine.   I want to be like you when I grow up( ) and I am twice your age already.

Admiringly,

John

PS:  If you test the pressure at the output of your compressor turbo and then get a read on the intake manifold, would that tell you how many pounds you are dropping across the "intercoolers"?  Wouldn't a filter minder at the input to the turbo evaluate the efficiency of your filter and plumbing to that point?

Lots of power and efficiency is burried in the heat loss of the ex system before the turbo and that heat also detracts from the comfort of the bus.  Heat wrap would seem to be a "gimmie".   Wouldn't want to go through that expense if I wasn't sure my current system was as efficient as i neededn and there weren't changes in the near offing.

Some thoughts only.