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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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08-14-2017, 03:25 PM | #1 |
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3" Overpipe Clearance issue
Hi. I am getting the Treadstone turbo installed and also a Tomei Expreme Ti Type 80 3" exhaust. I am going with the cat-less setup and the shop is fabricating a 3" stainless steel frontpipe. However, for the overpipe the shop is saying that there isn't enough clearance between the engine and cross member for a 3" overpipe and that I will have to go with a 2.5".
Can anyone advise if this is true? I am seeing some options for full 3" exhaust systems and 3" overpipe. Thanks in advance. Zee |
08-14-2017, 03:46 PM | #2 | |
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Quote:
I had a custom full turbo kit and full turboback exhaust done by a local shop 3". Never had a rattle, but I know for a fact it was a very tight fit.
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08-14-2017, 04:02 PM | #3 |
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Thanks man. I appreciate the feedback. I will relay this to the shop and see what they think.
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08-14-2017, 07:13 PM | #4 |
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I believe JDL makes 3" overpipe
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08-14-2017, 10:08 PM | #5 |
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JDL 3" over-frontpipe equipped. Nameless also makes (or made?) a one-piece 3". It has to be exactly right, and probably requires lifting the motor to get it through the gap.
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08-14-2017, 11:36 PM | #6 |
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I believe that one of the problems is having a 3.0in overpipe with a flange on it to connect to the front pipe. JDL solved this with having a vband connection, and then Nameless just made it a true one piece if I remember right. Definitely needs to be precisely made so I wouldn't trust any exhaust shop around me at least.
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08-15-2017, 08:53 AM | #7 |
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I actually have a 3" overpipe built by Treadstone installed on my car right now. I took it loose and wrapped it with heatwrap. It was a PITA to do, but I was able to get it mostly out to do it. So yes a 3 overpipe will fit.
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08-16-2017, 07:16 PM | #9 |
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Does anyone have any advice on going with the 2.5" instead? With the turbo and Tomei 3" and a 3" front pipe, will I see a significant power loss going with a 2.5" overpipe instead of a 3"?
JDL delivery time is 4-6 weeks and Nameless can't guarantee that they front/over pipe combo will fit with my system. The shop that is doing the turbo work said they won't fabricate a 3", only 2.5". Thanks in advance. Zee |
08-17-2017, 12:29 PM | #10 |
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Decided to go with the Tomei 2.5" overpipe and the Tomei 3" frontpipe. Hopefully the 2.5" overpipe isn't a big bottleneck and loss of performance.
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08-17-2017, 12:50 PM | #11 |
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Shouldn't effect performance too much. From what I've seen people have reported around 30whp increase from going full 2.5in to full 3.0in on a turbo setup. Definitely a good gain but with only the overpipe being 2.5 i'm curious if it would be that much of a choke on it.
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08-17-2017, 12:52 PM | #12 | |
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Quote:
Also I *think* the MXP(?) is a 2.7", so it would be an interesting data point to see the dropoff.
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08-17-2017, 10:22 PM | #13 |
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Contact from Treadstone sent a note saying due to 2.5" overpipe power loss at max would be 10-15hp. Said it's no big deal but tell that to the $15k I'm spending on turbo, clutch and exhaust...
O well, will have to find a 3" overpipe for next summer. |
08-19-2017, 08:07 PM | #14 |
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Is your downpipe 3 inches? I hear lots of claims of huge 25+ gains from 2.5 to 3 but I have yet to see a dynograph that supports this. I was just looking at midnight23's build journal, he has a Greddy setup and his 2.5/3 inch overlay graph showed gains, but nothing in double digits, and only between the 5k to 6.5k area.
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