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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 05-12-2020, 03:21 AM   #15
gpvecchi
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Regarding the piping sizes, I measured both headers and they are the external ones.
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Old 05-12-2020, 06:56 AM   #16
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Take a hammer and chisel to the cat in the header, then have a good tuner tune the car.

The dip isn't really the issue people make out.

Marketing has turned it into something to make money.

I tried Tomei headers, the decated OWM header beat them hands down.

No sticker or street cred though, only more power for no extra dollars.

Did I say use a "good" tuner.....

In the end a AVO turbo is what you want..

Have a look at me sig, the ending is sad though.

Do a skid...
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Old 05-12-2020, 09:55 AM   #17
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@86MLR: But shouldn't staying NA reduce chances of sad ending?
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Old 05-12-2020, 05:55 PM   #18
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@86MLR: But shouldn't staying NA reduce chances of sad ending?
That and not using Bridgestones RE003 (Indy Firehawks I believe the call them in the land of the trees and the home of the strays) when its wet.
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Old 05-13-2020, 03:15 AM   #19
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Thread revival

Wanted to harbor some thoughts from you guys. I've recently been looking at a Tomei EL header for my 2017+ brz which has the updated header from factory. According to this thread, the new oem design has larger pipe diameter (per post #2) starting from 45mm to 48.6mm. The Tomei is only 42.7mm to 45mm, which would be smaller than oem. The only advantage of the Tomei would be the removal of the cat.

Would that mean stock headers would potentially have better performance, sound aside.
Many of the aftermarket headers were just similar designs with the first generation OEM header without the cat.

Attached the details of the new header. There was an increase in the pipe diameters. The diameter change is 5% and 8% respectively. In fact, if you do the math, the actual area increase is even more! In the range of 11% and 16.5% ...

Only problem, is that the torque dip is worse. This makes total sense if you increase the pipes. They tried to hide this a bit with the red intake manifold and the 4.3 differential change.
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Old 11-08-2020, 12:15 AM   #20
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Originally Posted by johan View Post
^this

It's not wise to leave a close coupled cat in place with a supercharger. Just swap that out and leave the overpipe, front pipe, catback stock. I have my 2017 with a Tomei and Harrop SC and aside from the cold start, it sounds almost as quiet as stock - even with the blower.
Why is it not wise?
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Old 11-08-2020, 02:53 AM   #21
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because you have high EGT even on NA, and with forced induction you increase it even more and with a cat and supercharger you can possibly reach 1000 degrees Celsius in particular condition and risk of medium term damage to the cat
and that would also be dangerous to engine if cat falls apart
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Old 11-08-2020, 03:40 AM   #22
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Cat will fail soon with a s/c. These are the things vendors will not say often. Meaning that you 'll need to go with a catless header, because it'll increase the overall s/c cost.
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Old 11-08-2020, 06:19 AM   #23
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So all those S/C kits that are CARB legal will destroy cats thus making the kit no longer CARB legal???
Sounds legit.
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Old 11-08-2020, 07:51 AM   #24
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Quote:
Originally Posted by nikitopo View Post
Many of the aftermarket headers were just similar designs with the first generation OEM header without the cat.

Attached the details of the new header. There was an increase in the pipe diameters. The diameter change is 5% and 8% respectively. In fact, if you do the math, the actual area increase is even more! In the range of 11% and 16.5% ...

Only problem, is that the torque dip is worse. This makes total sense if you increase the pipes. They tried to hide this a bit with the red intake manifold and the 4.3 differential change.

That's a lot of changes and money to end up back where you started.
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Old 11-10-2020, 12:10 AM   #25
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So all those S/C kits that are CARB legal will destroy cats thus making the kit no longer CARB legal???
Sounds legit.
They run a very conservative tune, low boost but with enough abuse it will accelerate the wear of the primary cat

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Old 11-10-2020, 08:09 AM   #26
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They run a very conservative tune, low boost but with enough abuse it will accelerate the wear of the primary cat

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My respons was a direct reply to
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Originally Posted by nikitopo View Post
Cat will fail soon with a s/c. These are the things vendors will not say often. Meaning that you 'll need to go with a catless header, because it'll increase the overall s/c cost.
Which is very misleading.
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