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Old 08-01-09, 01:10AM   #16
70 bird
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With the cash you put out for that huge turbo I would try to go 5". Here are a few 4in. downpipe pictures from my build, If you get rid of the heater box you can get a 5 in there.
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Old 08-01-09, 09:12AM   #17
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Quote:
Originally Posted by 70 bird View Post
With the cash you put out for that huge turbo I would try to go 5". Here are a few 4in. downpipe pictures from my build, If you get rid of the heater box you can get a 5 in there.
Heater box is gone. My concern is the oil filter housing. Do you have enough room to access the filter?
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1979 Trans-Am Turbo Charged 535 IA2,
CV 1 heads with convertible exhaust option. 305cc, flowing 405cfm with mild intake port clean up


1979 Silver Anniversary 4 speed, numbers matching.
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Old 08-01-09, 06:03PM   #18
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Boc, this is my page showing a lot of my turbo install. If you look at the pics of my engine on the stand, especially rear shot you can see how I mounted the turbo, ran the 5 inch aorund and under the turbo and then down along side the motor and out.
http://www.americantorque.com/page/1/70/ Mark L
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Old 08-01-09, 07:24PM   #19
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Quote:
Originally Posted by marks73ta View Post
Boc, this is my page showing a lot of my turbo install. If you look at the pics of my engine on the stand, especially rear shot you can see how I mounted the turbo, ran the 5 inch aorund and under the turbo and then down along side the motor and out.
http://www.americantorque.com/page/1/70/ Mark L
Thanks Mark.
I was on it today before I went to the truck shop for a few 5 inch pipes.
I will be using the 5 inch down pipe, it should just make it. You really spent alot of time with the piping. looks real good.

I spent the better part of the day trying to fit this thing, it just won't go in with out a fight, It is making me earn the power it will produce. lol

I wound up cutting up the rad support, front bumper and hood support to make space for it. Who said single's were easier than twins.

Below are a few pics of where it most likely will go. I should have the T6 flange this week to fab up the support bracket that will hold it.
My heads are under way at the race shop. Hopefully by the end of the week they will be done there and then to Jim for the convertible exhaust.
It looks like it will be the end of the month before I get the engine back in and headers mocked up.

Mark, Who makes the 5 inch to dual 3 split you have there?
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1979 Trans-Am Turbo Charged 535 IA2,
CV 1 heads with convertible exhaust option. 305cc, flowing 405cfm with mild intake port clean up


1979 Silver Anniversary 4 speed, numbers matching.
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Old 08-01-09, 08:14PM   #20
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Heater box is gone. My concern is the oil filter housing. Do you have enough room to access the filter?
No problem with the filter, there is more room now than n/a with hedman headers.
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Old 08-02-09, 07:02PM   #21
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Doc, I ordered it thru summit. Flowmaster makes and it is actually 1--5 inch into 2--3.5 inch for the exhaust. The other merge is 1--3 inch into 2---2.5 inch for the up pipe. MArk L
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Old 08-09-09, 05:37PM   #22
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So I spend the morning finishing up the mock up before I weld the turbo mounts on. Mount the bumper for clearance. Then I go to weld and in usual fashion the bracket labeled T6 is really a T4. To small!
So now back to hurry up and wait for the right one. It will get here and I will be on vacation not able to work on the car. Two week delay because some one did not were their glasses.
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1979 Trans-Am Turbo Charged 535 IA2,
CV 1 heads with convertible exhaust option. 305cc, flowing 405cfm with mild intake port clean up


1979 Silver Anniversary 4 speed, numbers matching.

Last edited by DocsTA : 08-09-09 at 05:53PM.
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Old 08-09-09, 05:49PM   #23
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did you borrow my luck for the day.LOL
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
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Old 08-10-09, 11:19AM   #24
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Sorry to hear about your luck.

As for me, if I didn't have bad luck, I would not have any luck at all. LOL!

I don't know how Mark got 5" to fit down past the firewall and the oil filter housing, I tried all day Saturday with no luck, I ended up going and buying a 5" to 4" reducer to use right there at the firewall. I will see if I can get some pics later tonight if I remember.
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463 SRP .035 Pistons, Eagle rods, N crank, Comp 294s cam, KRE Aluminum D-port heads 290 cfm, 10.6-1 compression, Pump gas, Torker II intake, Holley 830DP carb, TH400, Continental tight 3500 converter, 3.73 gears. First day out 11.74@116. Needs more tuning, yet to come.
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Old 08-10-09, 09:55PM   #25
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Here are a few pics of my 5" pipe by the firewall. If I moved the 1/2" plate bolted to the firewall and used a remote filter mount, it should work, just too close for me if its a street/strip car. Let me know if you got any better ideas.
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463 SRP .035 Pistons, Eagle rods, N crank, Comp 294s cam, KRE Aluminum D-port heads 290 cfm, 10.6-1 compression, Pump gas, Torker II intake, Holley 830DP carb, TH400, Continental tight 3500 converter, 3.73 gears. First day out 11.74@116. Needs more tuning, yet to come.
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Old 08-10-09, 10:08PM   #26
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I could never have gotten a 5 inch down in there on my car. I have two 3 inch pipes front to back that slide in there pretty easy.

Keeps the oil hot.LOL

No oil pan heater needed on my car.
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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Old 08-10-09, 10:24PM   #27
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Those pics help alot. I know I have room,just not sure how much. 5 inch will be a tight squeeze. 4 would be soooo much easier.
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1979 Trans-Am Turbo Charged 535 IA2,
CV 1 heads with convertible exhaust option. 305cc, flowing 405cfm with mild intake port clean up


1979 Silver Anniversary 4 speed, numbers matching.
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Old 08-10-09, 10:57PM   #28
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I have some pics somewhere from TTF of someone with a second gen Comaro with a 5" down pipe. He went on the outside of the frame by the tire, and under the frame then down the car. Looked like way to much work for me.
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463 SRP .035 Pistons, Eagle rods, N crank, Comp 294s cam, KRE Aluminum D-port heads 290 cfm, 10.6-1 compression, Pump gas, Torker II intake, Holley 830DP carb, TH400, Continental tight 3500 converter, 3.73 gears. First day out 11.74@116. Needs more tuning, yet to come.
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Old 08-10-09, 11:35PM   #29
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I have some pics somewhere from TTF of someone with a second gen Comaro with a 5" down pipe. He went on the outside of the frame by the tire, and under the frame then down the car. Looked like way to much work for me.
4rsfed.com that Camaro is a sweet build.
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1979 Trans-Am Turbo Charged 535 IA2,
CV 1 heads with convertible exhaust option. 305cc, flowing 405cfm with mild intake port clean up


1979 Silver Anniversary 4 speed, numbers matching.
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Old 08-11-09, 02:01PM   #30
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Just an idea... you could put the pipe in place close to where you want it and mark the tight areas with a paint stick. Pull the pipe out get it cherry red with a torch tap the area in with a hammer wait for it to cool and try to refit, do as many times as needed until you get it to fit, paint and wrap it with header wrap. Might sound crazy and time consuming but thats what I would try.
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