North American Turbocoupe Organization



Divroced wastegate?
turbobirdsilver Offline
Member
#1
Im thinking of welding up a new downpipe. I ahve a 3 inch from the turbo elbow, i want to do a 3 inch from the turbo and a seperate 1 3/4 inch for the wastegate, I'll just dump it onto the ground. This will help flow and give it a cool sound.

Anyone else tried this?

Ray
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Turbo Coupe Offline
Senior Member
#2
do you know what size dia the stock exhaust elbow is on the turbo?

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1987 Turbo Coupe 5 Speed 3500lbs w/driver
-Cone Mounted on VAM
-BCS Disconnected, 17~18psi
-AC Delete
WISH I HAD MY OLD CAR AGAIN!
R.I.P
1987 Turbo Coupe 5 Speed - 1.77 60ft, 8.811 @ 76.76 1/8th
-Draglites With Hoosier QTPs & 165Rs
-Weight Reduction
29xxlb Race Weight w/Driver
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turbobirdsilver Offline
Member
#3
2.5 inches
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Turbo Coupe Offline
Senior Member
#4
thats funny, everyone says to go with a 3" downpipe and catback, if the outlet is only 2.5" anything larger then that furhter down the line is not doing any good. isnt the stock downpipe 2.5" od/

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1987 Turbo Coupe 5 Speed 3500lbs w/driver
-Cone Mounted on VAM
-BCS Disconnected, 17~18psi
-AC Delete

[This message has been edited by Turbo Coupe (edited 06-25-2005).]
WISH I HAD MY OLD CAR AGAIN!
R.I.P
1987 Turbo Coupe 5 Speed - 1.77 60ft, 8.811 @ 76.76 1/8th
-Draglites With Hoosier QTPs & 165Rs
-Weight Reduction
29xxlb Race Weight w/Driver
Reply

V6TBird87 Offline
Posting Freak
#5
you also know whats funny? see how big the turbine in the exhaust side is? we should only match our exhaust to the size of the turbine, since anything bigger isnt needed

as any turbo guy knows, the bigger the exhaust, the better, any sort of backpressure can slow spool time, and give the turbo a hard way to go in the higher RPMS

Ray: ive never done it, never seen it, but i have heard of it, it would be very interesting

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1987 Thunderbird 3.8
1987 Turbo Coupe, 5-speed

www.foxthunderbirds.fast-go.com

aka Tbird232ci
2018 Mustang GT
1988 Turbo Coupe, 5-speed

aka Tbird232ci
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Pete D Offline
Administrator
#6
Quote:if the outlet is only 2.5" anything larger then that furhter down the line is not doing any good.

It works. I'm not going into an explanation of why beyond "pressure differential" but trust us, the 3" works
Pete Dunham


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Pete D Offline
Administrator
#7
Quote: any sort of backpressure can slow spool time,

The area of greatest back pressure is in the turbine housing
Pete Dunham


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turbobirdsilver Offline
Member
#8
Im not the only guy who has ever tried this am i?

Ray
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turbobirdsilver Offline
Member
#9
i guess i am. We'll see how much power increase there is.

Ray
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