North American Turbocoupe Organization



Question on exhaust???
Pat Fay Offline
Member
#1
I was thinking about my exhaust today and was wondering... How much horsepower can a 3" downpipe into 2 1/2" Duals (all mandrel bent) support? And also whenever I get the Turbo Notch project started... How much can a single 3" exhaust all the way back support? On the notch I may need to go bigger..?

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Pat
[email protected]
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87 TC - (first car, totalled now a parts car) If you need anything send me a PM
87 TC - Bought w/ 42,000 original miles, K&N in fender, Gillis at 17-18psi, 3" downpipe no cat into 2 1/2" ATR Duals, Timing at 12-13*, Chrome Cobra R's on 245/45/17's... Centerforce Clutch going in soon... Also looking for Volvo IC, T3 w/ .48 A/R and some kind of BOV.
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85 Turbo Bird Offline
Member
#2
The 3"DP to dual 2.5" should be fine. I don't know for sure at which hp number that it becomes a restriction but, for all reasonable numbers, it should be just fine.

I am going to be putting on a 3" MAC mustang GT catback in the next week or so and that will be plenty for my goals.

based on the mathmatics and physics, the single 3" will flow better. I don't think that you'll need to go any bigger than that.

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85 TC Auto

250-280 rwhp or Bust!!!!
mods: Sony HU, Pioneer 6.5" 3-way in the door and Pioneer 6x8 2-way in the rear deck; full 3" exhaust just waiting to be installed(dp, hi-flow cat, 3" MAC mustang GT cat-back)
85 TC Auto

250-280 rwhp or Bust!!!!
mods: Sony HU, Pioneer 6.5" 3-way in the door and Pioneer 6x8 2-way in the rear deck; full 3" exhaust installed(dp, hi-flow cat, 3" MAC mustang GT cat-back)
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Pat Fay Offline
Member
#3
Quote:Originally posted by 85 Turbo Bird:
The 3"DP to dual 2.5" should be fine. I don't know for sure at which hp number that it becomes a restriction but, for all reasonable numbers, it should be just fine.

I am going to be putting on a 3" MAC mustang GT catback in the next week or so and that will be plenty for my goals.

based on the mathmatics and physics, the single 3" will flow better. I don't think that you'll need to go any bigger than that.



But you think a single 3" will be a limit on say a 450hp motor?


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Pat
[email protected]
~~~~~~~~~~~~~~~~~~~~~~~~
87 TC - (first car, totalled now a parts car) If you need anything send me a PM
87 TC - Bought w/ 42,000 original miles, K&N in fender, Gillis at 17-18psi, 3" downpipe no cat into 2 1/2" ATR Duals, Timing at 12-13*, Chrome Cobra R's on 245/45/17's... Centerforce Clutch going in soon... Also looking for Volvo IC, T3 w/ .48 A/R and some kind of BOV.
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Nate K Offline
Posting Freak
#4
Hey Pat, here's some info on what hp different pipe sizes can handle (as a quideline/reference)
http://www.bobsmuffler.com/sugpipe.htm
NATO Member
3 - 88 TURBOCOUPES www.turbotbird.com/showroom/nk_88tc.html
90 Mustang LX 5.0L Notch

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70 Torino 351C
79 Bronco 351M/400 on 35's
79 Trans Am 403 (6.6L)
88 Cougar XR7 5.0L
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