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Old 03-23-2021, 11:09 PM   #1
swrd2k
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Default downpipe advice needed 83 242glt

looking to make a new downpipe for my 240 I was just wondering what most people did about upsizing the 2.25 inch exhaust port on the hotside for a 3 inch setup. 99% sure I have the garrett t3. Currently have stock downpipe with big ol cat
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Old 03-24-2021, 08:26 AM   #2
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At one time this place offered a T3 to 3 inch stainless downpipe flange and I bought one for my downpipe, but it appears they now only offer one for T25/Td04. https://genuinesaab.com/catalog/prod...roducts_id=621

So far my searching cannot find any other suppliers.

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Old 03-24-2021, 11:20 AM   #3
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You mean something like this ?





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Old 03-24-2021, 11:29 AM   #4
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Quote:
Originally Posted by dbarton View Post
At one time this place offered a T3 to 3 inch stainless downpipe flange and I bought one for my downpipe, but it appears they now only offer one for T25/Td04. https://genuinesaab.com/catalog/prod...roducts_id=621

So far my searching cannot find any other suppliers.

I think I found one place https://martelius.com/en/downpipe-co...bly-volvo-saab is this the same piece? I just don't know if its 3 inch
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Old 03-24-2021, 11:30 AM   #5
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Originally Posted by Dicktater View Post
You mean something like this ?





YES actually exactly something like that, do you make them? if not I need a flange or a way to modify my 2.25 inch flange
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Old 03-24-2021, 11:55 AM   #6
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I had 5 flanges made a few years ago, found the dwg cad file here and downloaded it to a cd and took it to my water jet guy. Everyone here wanted a 3" downpipe till it came time to cough up some cash. I sold all but one of what I called a downpipe starter kit.

I think I still have a flange, I also have a used downpipe I don't need as I switched to a Holset but I made these for 740/940.
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Old 03-24-2021, 01:01 PM   #7
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http://www.mandrelbends.com/transiti...tion-cone.html
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Folks on here don't know a good deal when they see it.
how psi stock cna support?


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Old 03-24-2021, 01:33 PM   #8
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Quote:
Originally Posted by swrd2k View Post
I think I found one place https://martelius.com/en/downpipe-co...bly-volvo-saab is this the same piece? I just don't know if its 3 inch
No. That looks like the stock small diameter only.
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Old 03-24-2021, 01:35 PM   #9
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That's not gonna work.
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Old 03-24-2021, 01:39 PM   #10
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Quote:
Originally Posted by swrd2k View Post
I think I found one place https://martelius.com/en/downpipe-co...bly-volvo-saab is this the same piece? I just don't know if its 3 inch
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Originally Posted by dbarton View Post
No. That looks like the stock small diameter only.
They make them to order in 2 sizes.

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Originally Posted by martelius
Downpipe cone + flange assembly for building your own downpipe. Fits to original turbo of: Volvo 240 /740 / 940 turbo and Saab 900 ng / 9-3 og / 9-5 all turbo models except diesel. Outlet is 70mm as standard, or 76mm upon request.
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Old 03-24-2021, 01:39 PM   #11
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You mean something like this ?
I like that heavy flange. Nice piece.
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Old 03-24-2021, 01:56 PM   #12
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Check with Burns Stainless in Ca. I used them when I built the S/S exhaust for my V8 wagon. Made many more exhausts with their products.
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Old 03-24-2021, 08:35 PM   #13
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Quote:
Originally Posted by Dicktater View Post
I had 5 flanges made a few years ago, found the dwg cad file here and downloaded it to a cd and took it to my water jet guy. Everyone here wanted a 3" downpipe till it came time to cough up some cash. I sold all but one of what I called a downpipe starter kit.

I think I still have a flange, I also have a used downpipe I don't need as I switched to a Holset but I made these for 740/940.
I honestly wouldn't mind a used downpipe I got the car for pretty cheap so obviously not trying to spend a ton but what would you take for it?, and would 740/940 have pretty similar fit
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Old 03-24-2021, 08:54 PM   #14
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Originally Posted by hiperfauto View Post
They make them to order in 2 sizes.
I do see that they have a 3 inch cone now my bad
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Old 03-25-2021, 12:01 PM   #15
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I bought this from KL Racing (from my for sale thread - http://forums.turbobricks.com/showthread.php?t=342720)
Meant to bolt up to the stock 13C.

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Old 03-25-2021, 08:31 PM   #16
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I bought this from KL Racing (from my for sale thread - http://forums.turbobricks.com/showthread.php?t=342720)
Meant to bolt up to the stock 13C.

would it bolt to a t3?
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Old 03-25-2021, 09:49 PM   #17
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Originally Posted by dbarton View Post
That's not gonna work.
Dave
Depends on how long the cone is.
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Old 03-26-2021, 03:50 AM   #18
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Originally Posted by swrd2k View Post
would it bolt to a t3?
KL says it fits 240 Turbos too, I personally don't know though.
If the output flange is the same, then of course it would.
https://shop.klracing.se/sv/artiklar...940-turbo.html
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Old 03-26-2021, 01:05 PM   #19
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Output flange on T3 is the same as the little bitty mitsu turbo. Just be ready to modify the wastegate for a bit more flow. When you go to a 3" exhaust. You make it more efficient so you can encounter boost creep from the wastegate not flowing as well as the exhaust. When this happened to me I got a wastegate from Cherry Turbos which flowed better and solved the problem. Just going to the exhaust without any other changes raised the boost pressure 2psi.
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Old 03-26-2021, 02:28 PM   #20
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Originally Posted by dl242gt View Post
Output flange on T3 is the same as the little bitty mitsu turbo. Just be ready to modify the wastegate for a bit more flow. When you go to a 3" exhaust. You make it more efficient so you can encounter boost creep from the wastegate not flowing as well as the exhaust. When this happened to me I got a wastegate from Cherry Turbos which flowed better and solved the problem. Just going to the exhaust without any other changes raised the boost pressure 2psi.
so you removed the stock internal wastegate and went external wastegate or got a bigger internal one? I will definitely do this I am not looking to go crazy on boost but a little more with a more efficient exhaust sounds like the plan.
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Old 03-26-2021, 06:20 PM   #21
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SPD Exhaust has all sorts of cones, and will do slip transitions with them as well.
They lists different styles of cones, so pay attention to what you’re ordering.
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Old 03-26-2021, 08:16 PM   #22
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Go big.

https://www.atpturbo.com/mm5/merchan...egory_Code=WGT





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Old 03-27-2021, 03:28 PM   #23
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The T3 wastegate is bolted onto the turbine housing with five bolts. Cherry turbos modified the wastegate so it will flow past the two 90 degree bends easier. He sold me the modified wastegate which I then bolted onto the turbine housing. It was still an internal gate controlled turbo.
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Old 03-27-2021, 11:57 PM   #24
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The T3 wastegate is bolted onto the turbine housing with five bolts. Cherry turbos modified the wastegate so it will flow past the two 90 degree bends easier. He sold me the modified wastegate which I then bolted onto the turbine housing. It was still an internal gate controlled turbo.
Cool thank you just got confused very new to most of this stuff but figuring it out.
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Old 03-28-2021, 12:15 AM   #25
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Saw a T3/T4 and “Ride like the wind Bullseye...”

Chicks dig big boosting 242’s...
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