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  turbo coupe exhaust

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Author Topic:   turbo coupe exhaust
uncatchable
Journeyman

Posts: 7
From:
Registered: Jun 2006

posted 07-10-2006 07:07 PM     Click Here to See the Profile for uncatchable        Reply w/Quote
My T/C is very low miles and I'm attempting to put it back to its former glory, I was wondering if they are supposed to have dual exhaust? Mine does not but every other one I've seen does. Thanks in advance and thanks for the welcome.

Andrew

SkinnyMan
Gearhead

Posts: 916
From: Tupelo, MS - USA (CA temporarily)
Registered: Jan 2005

posted 07-10-2006 11:02 PM     Click Here to See the Profile for SkinnyMan        Reply w/Quote
quote:
Originally posted by uncatchable:
My T/C is very low miles and I'm attempting to put it back to its former glory, I was wondering if they are supposed to have dual exhaust? Mine does not but every other one I've seen does. Thanks in advance and thanks for the welcome.Andrew

Andrew,

Welcome to M&M. Great site, good advice, excellent folks.

There's only 4 cylinders in the turbo coupe. There may be two outlets from some of the mufflers. I don't see an effiecient dual pipe system with catalytic converters and all for a 4-cyl.

Another thing to be careful of (and I am not sure how applicable this is to turbo cars) is going TOO big on exhaust systems. A certain amount of back pressure is good, but you can go too far one way or the other.

Could be wrong, and if so, someone will be along shortly to correct me.

------------------
SkinnyMan
Tupelo, MS

Thank you, Thank you very much!

[This message has been edited by SkinnyMan (edited 07-11-2006).]

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 07-11-2006 02:39 AM     Click Here to See the Profile for KULTULZ        Reply w/Quote
What year T/C do you have? I will check the MPC for availability.

There is no reason one cannot run duals from the engine through low restriction cats and tie it into the 5.0L duals (even if borrowed from a FOX MUSTANG).

Whitson
Gearhead

Posts: 290
From: Western Canada
Registered: Dec 2005

posted 07-11-2006 11:35 AM     Click Here to See the Profile for Whitson        Reply w/Quote
Your car only has single exhaust because it's a auto trans. The 5 speed cars came with dual exhaust.
If you're staying stock, get the manual trans exhaust parts. If you want to build something trick, go with a 3" down pipe coming off the turbo, Y it into a pair of 2-1/4" mufflers, and yes fox Mustang tail pipe will fit after they are extended on the front a bit.

uncatchable
Journeyman

Posts: 7
From:
Registered: Jun 2006

posted 07-11-2006 03:50 PM     Click Here to See the Profile for uncatchable        Reply w/Quote
My t/c is an 87 and my father has an 88 that has dual exhaust and auto trans, we know its original the car only has 2**** miles on it!?

SkinnyMan
Gearhead

Posts: 916
From: Tupelo, MS - USA (CA temporarily)
Registered: Jan 2005

posted 07-11-2006 10:50 PM     Click Here to See the Profile for SkinnyMan        Reply w/Quote
quote:
Originally posted by uncatchable:
My t/c is an 87 and my father has an 88 that has dual exhaust and auto trans, we know its original the car only has 2**** miles on it!?

Where does the dual exhaust start? Is it at the exhaust side of the turbo
? After the Catalytic converter? On the downstream side of the muffler?

------------------
SkinnyMan
Tupelo, MS

Thank you, Thank you very much!

uncatchable
Journeyman

Posts: 7
From:
Registered: Jun 2006

posted 07-11-2006 11:48 PM     Click Here to See the Profile for uncatchable        Reply w/Quote
Best I can tell from pictures and the models I currently own of this car it is directly after the cat, where it seperates into a y pipe then 2 seperate mufflers and tail peices.

Whitson
Gearhead

Posts: 290
From: Western Canada
Registered: Dec 2005

posted 07-12-2006 10:39 AM     Click Here to See the Profile for Whitson        Reply w/Quote
The "Y" is after the cat, but before the mufflers. Stock pipe size is 2-1/2" before the Y, 2" after, 1-7/8" tail pipes.

[This message has been edited by Whitson (edited 07-12-2006).]

trashline
Gearhead

Posts: 2230
From: Levittown, Pa
Registered: Dec 2003

posted 07-15-2006 07:59 PM     Click Here to See the Profile for trashline        Reply w/Quote
Autos/ manuals came both with dual exhuast.

your best bet ford the most power would be togo with www.40bob.com for his 3in elbow and his turbo log header, then run that into a 3in DP and you can run single 3 inch or anything after that. Get a highflow cat and a straight thru style muffler. Stay away from chambered mufflers b/c they DO NOT imporve performance but restrict it, something like the flowmaster is what Im talking about. your better off with a DYNOMAX ultra flo or super turbo. theres no way youll max out a single 2.5 " system with the 3"dp.

But take warning that trans will NOT hold up to serious power so be careful with your mods.

Backpressure on turbo cars is like non existant. When the turbo spools above 30,000 rpms and is forcing air out the exhaust it is non existant. This is why people can upgrade the exhaust toa full 3" mandrel bent system with no problems.
Also stock exhaust was 2.5 to the Y then the tailpipes were different sizes. Reason being was because the fuel tank is closer to the fender on the passanger side so they ran a smaller pipe on that side vs the driver side.
------------------
88 thunderbird TC 2.3L
Gillis at 18 psi, walbro fuel pump, Kirban afpr, 3.73 8.8" rear, rebuilt head, Ranger roller, .48/.60 T3 with clipped wheel, ported elbow, 3 in exhuast, FMIC

66 mustang V8 swap baby

68 Fairlane 289 w/ auto
rusting away motor is going in the mustang

[This message has been edited by trashline (edited 07-15-2006).]

cookie_monster
Journeyman

Posts: 70
From: south, central, us
Registered: Nov 2005

posted 08-03-2006 08:39 PM     Click Here to See the Profile for cookie_monster        Reply w/Quote
You can go as big as you want on the exhaust....in the case of ALL turbocharged engines, bigger IS better! I don't care what anyone says, I will argue it all day long. Backpressure? Jeezus, we have enough of that now....especially with the tiny IHI turbo on the '87-88 TC's. Exhaust manifold pressure can be nearly, if not higher, than the intake manifold pressure. Why on earth would you want pressure in the rest of the exhaust system? I had an SVO....

The SVO was 'new' to me. Never seen one in life, but I picked up on a straight trade (gave absolutely NOTHING for it other than a car I was given). I had to do some work to it....clutch mainly. Got it running and kind of got a feel for how these 2.3T engines ran. Not bad for a 4 banger. That was with the stock exhaust, which had a clogged catalytic converter (red hot manifold & turbo, low power). So, I took the turbo and cracked E3 manifold off as well as the stock POS exhaust system. Upgraded to a brand new E6 manifold. I cut the factory POS elbow off of the T3 and welded me up a 3" downpipe (the elbow is cast STEEL and welds beautifully with a MIG) into a 3" pipe ....then into dual 2 1/2" tailpipes that "Y'd" just behind the crossmember. Mufflers were dual 2 1/2" bullets. The tailpipes were just regular 5.0 '86-later pipes...got 'em from Summit for I think just under $100. The difference is NIGHT & DAY putting it lightly. Not only did I have full boost nearly 900 RPM sooner (2100 versus almost 3000), but the car got better fuel mileage and was MUCH MUCH more responsive. Later on, I got rear ended and the collision ruined the tailpipes and most of the rest of the exhaust so it gave me a good excuse to "play" with it. LA3 computer was the first mod...and that in itself was worth every penny! It originally had a TE, IIRC (stock '84 SVO) so a repin was required...but it took maybe 15 minutes. I liked it...little more responsive, better cool weather starting/idling and it seemed to pull harder up top but that may have been due to a straight 3" downpipe..and nothing else. Then, the real mods. I added a Holset HE351CW turbo, home made center mount header, Isuzu NPR intercooler and 2.5" dia. IC tubing, MAF conversion and a J3 adapter so I could 'play' with the fuel & timing a little bit. I also had 46 lb injectors. Though the holset was very sluggish at lower speeds (5 psi by 2800, 10psi by 3300, and full boost at 3800), it pulled easily twice as hard up top as it did with the T3. I dont think 300 HP was an unrealistic estimate. Traction in first was nonexistant, 2nd was almost as bad...but once I learned how to drive it, it really was quite fast. Faster than my 2003 Lightning....and all that on the stock head that was only cleaned up a little. STock valves & all. I did retard the cam a little though. BTW, the Holset...I got it with the elbow and everything, cut part of the elbow off and welded a 3 1/2" downpipe onto it, which went back to a 3 1/2" muffler and dumped just in front of the driver's side tire (oval tip...looked kinda cool).

Maybe I should have put a 2" exhaust on there...for a little backpressure. I'm sure I could have had much slower overall response and maybe I would have had some boost by 5000 RPM.

From what I'v seen, 3" is about the best all around system...gives you room to grow later on if you want to mod the motor a little, but it works equally well on a stocker.

BTW, a friendly visit to turboford.org can get you all the info you want...those guys over there are pretty sharp on the TC and SVO.

[This message has been edited by cookie_monster (edited 09-17-2006).]

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