3" downpipe with A/C
#1
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3" downpipe with A/C
Have any of you guys seen or heard of anybody with a 3" downpipe and full exhaust on a civic with A/C?
If so any pictures?
[Modified by Mochanic, 2:31 AM 2/15/2003]
If so any pictures?
[Modified by Mochanic, 2:31 AM 2/15/2003]
#2
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#3
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Re: 3" downpipe with A/C (DefiantGSR)
BTW, would it be possible to have:
inlinePRO manifold
t3/to4e 57 trim .63 A/R 5 bolt
3" downpipe
3" exhaust
and STILL retain AC? stoopid did it with a 4 bolt turbo...wondering if it could be done with 5 bolt
inlinePRO manifold
t3/to4e 57 trim .63 A/R 5 bolt
3" downpipe
3" exhaust
and STILL retain AC? stoopid did it with a 4 bolt turbo...wondering if it could be done with 5 bolt
#6
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Re: 3" downpipe with A/C (DefiantGSR)
I doubt it. I just made a 2.5" long enough to clear A/C then flared to 3". Probably lost 1 HP or something by doing that.
#7
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Re: 3" downpipe with A/C (Mochanic)
Heres the one I just finished tonight.
I have 12 pictures total, email me if you want the rest of them.
Randy
Modified by Mochanic at 2:50 AM 5/18/2004
I have 12 pictures total, email me if you want the rest of them.
Randy
Modified by Mochanic at 2:50 AM 5/18/2004
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Re: 3" downpipe with A/C (DefiantGSR)
i think they are working..i just checked it.
#11
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Re: 3" downpipe with A/C (Hatchblack)
>>I just made a 2.5" long enough to clear A/C then flared to 3". Probably lost 1 HP or something by doing that.<<
According to this article https://honda-tech.com/zerothread?id=414433 you might have lost power going with the 3" DP...
It might be better off starting with 2.5" and flaring to 3" later in the exhaust stream. I thought the article was very informative... I guess ideal DP size depends entirely on the size of the exhaust side of your turbo. From what I got from the article, you want the first part of the DP to be as close to the same size as the turbo exhaust outlet as possible, with a gradual "trumpet" type of flare.
According to this article https://honda-tech.com/zerothread?id=414433 you might have lost power going with the 3" DP...
It might be better off starting with 2.5" and flaring to 3" later in the exhaust stream. I thought the article was very informative... I guess ideal DP size depends entirely on the size of the exhaust side of your turbo. From what I got from the article, you want the first part of the DP to be as close to the same size as the turbo exhaust outlet as possible, with a gradual "trumpet" type of flare.
#12
Re: 3" downpipe with A/C (fsp31)
According to this article https://honda-tech.com/zerothread?id=414433 you might have lost power going with the 3" DP...
#13
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Re: 3" downpipe with A/C (ObiWanCanblowme)
>>According to the dyno, you'll make more power at all RPM points with a 3.0" downpipe....<<
...given several other parameters you didn't bother to list. Thanks for the informative post.
edit: How about some facts...
"if a larger bellmouth is excessively large right at the turbine discharge (a large step diameter increase), there will be an unrecoverable dump loss that will contribute to backpressure. This is why a gradual increase in diameter, like the conical diffuser mentioned earlier, is desirable at the turbine discharge. "
[Modified by fsp31, 3:48 PM 2/14/2003]
...given several other parameters you didn't bother to list. Thanks for the informative post.
edit: How about some facts...
"if a larger bellmouth is excessively large right at the turbine discharge (a large step diameter increase), there will be an unrecoverable dump loss that will contribute to backpressure. This is why a gradual increase in diameter, like the conical diffuser mentioned earlier, is desirable at the turbine discharge. "
[Modified by fsp31, 3:48 PM 2/14/2003]
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Re: 3" downpipe with A/C (Hatchblack)
I doubt it. I just made a 2.5" long enough to clear A/C then flared to 3". Probably lost 1 HP or something by doing that.
BTW, I am not only interested in AC but also quicker spool times. Just wondering if the 2.5 to 3" DP spool time would be more than a straight 3"?
[Modified by DefiantGSR, 4:24 PM 2/14/2003]
[Modified by DefiantGSR, 4:25 PM 2/14/2003]
[Modified by DefiantGSR, 4:26 PM 2/14/2003]
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Re: 3" downpipe with A/C (fsp31)
"This is why a gradual increase in diameter, like the conical diffuser mentioned earlier, is desirable at the turbine discharge. "
-Sweet, that's what I did. Yeah, I read that too, pretty cool info. I think the 3" is going to do me better since I'm going to be running 12+ PSI with a decent sized turbo. I think Art picked up like 10 HP when he went from the Revhard 2.5 to his custom 2.5-3" downpipe.
-Sweet, that's what I did. Yeah, I read that too, pretty cool info. I think the 3" is going to do me better since I'm going to be running 12+ PSI with a decent sized turbo. I think Art picked up like 10 HP when he went from the Revhard 2.5 to his custom 2.5-3" downpipe.
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Re: 3" downpipe with A/C (Hatchblack)
what about having AC with the setup i posted up top but with a 4 bolt turbo? just exploring my possibilities.
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Re: 3" downpipe with A/C (Mochanic)
JFYI
the square box I built was made from 16ga sheet metal and it has an area of 9 sq" VS a round 3" pipe that has 7 sq", and a 2.5" that has only 4.9 sq"!!!
In other words, it is almost the same as a 3.5" round pipe, and its mounted on a 3" VBAND directly in between the 62-1 turbo (on a Rev Hard manifold) and full size A/C compressor with room to spare!
Who says it couldn't be done?
Now, what else "can't be done"?
the square box I built was made from 16ga sheet metal and it has an area of 9 sq" VS a round 3" pipe that has 7 sq", and a 2.5" that has only 4.9 sq"!!!
In other words, it is almost the same as a 3.5" round pipe, and its mounted on a 3" VBAND directly in between the 62-1 turbo (on a Rev Hard manifold) and full size A/C compressor with room to spare!
Who says it couldn't be done?
Now, what else "can't be done"?
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Re: 3" downpipe with A/C (LiLOtaku)
Hey Mochanic, what fittings and size steel line did you use to make your oil return line to your pan? Looks pretty clean and purty .
1 45 -10 AN to 1/2 npt
2 45 -10 AN hose ends
1 straight -10 AN to 1/2 NPT with a 1/2" NPT steel nut that is welded to the inside of the oil pan
Thats the 3rd one I have done for customers so far. Clean, and neat is the only way I do something!
Thanks
Randy
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Re: 3" downpipe with A/C (Mochanic)
Just drove the car with the newly designed "box" style 3" square downpipe!!!
Holllllyyyyyyyy crap what a ride!!! The 62-1 stage 5 is spooled by 4000k and blows the tires away just rolling on the throttle through 2nd gear and that was only at 11psi!!! I was very impressed at the throttle response and how it was not really loud at all... I will have more pics soon with everything installed and hopefully by then some dyno numbers too!
Randy
Holllllyyyyyyyy crap what a ride!!! The 62-1 stage 5 is spooled by 4000k and blows the tires away just rolling on the throttle through 2nd gear and that was only at 11psi!!! I was very impressed at the throttle response and how it was not really loud at all... I will have more pics soon with everything installed and hopefully by then some dyno numbers too!
Randy
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Re: 3" downpipe with A/C (rOby)
Hey ROBY, give me a call tomorrow, I have a ? for you.
being a millionaire would be nice, but thats now what I do it for, I like challenges, especially when somebody says it CAN"T be done... I get to prove them all wrong
Just as long as I get credit for it, I'm happy.
Randy
being a millionaire would be nice, but thats now what I do it for, I like challenges, especially when somebody says it CAN"T be done... I get to prove them all wrong
Just as long as I get credit for it, I'm happy.
Randy
#24
Re: 3" downpipe with A/C (Mochanic)
Randy,
remember thats just a best-guest map in his Hondata, I would take it easy till he gets its wideband tuned. I dont want Mario saying I blew-up his car
remember thats just a best-guest map in his Hondata, I would take it easy till he gets its wideband tuned. I dont want Mario saying I blew-up his car
#25
Re: 3" downpipe with A/C (rOby)
liar patent your "box" and become a millionare!