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


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Old 05-22-2012, 11:32 AM   #29
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Quote:
Originally Posted by DanPO View Post
I hope Perrin comes out with a straight back (center exit) race pipe with dual tips (no muffler). You would obviously need a different rear lower fascia/valance (whatever it's called) to make the center single exit pipe look nice. Would be cool if there was a carbon fiber option on the rear lower fascia/valance. This setup without a muffler would save a ton of weight and be an aggressive option for track go-ers.
Prova has a center exit system available

We are working on the details with Prova Japan, however this will also include the new lower rear section as well for the bumper.


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Old 05-22-2012, 11:41 AM   #30
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Wow, that is ehhhhh.... special
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Old 05-22-2012, 11:57 AM   #31
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Love the Prova exhaust, HATE the diffuser.
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Old 05-22-2012, 06:50 PM   #32
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^I agree! I don't like how you can see the exhaust pipe from a distance...
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Old 05-23-2012, 02:37 AM   #33
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They could have fit just a mesh grill there, at least it would look like a race car.
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Old 05-23-2012, 09:41 AM   #34
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Do any of these exhaust mods require ECU mods as well? I'm concerned that if I make a change it will screw something up.
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Old 05-23-2012, 09:45 AM   #35
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Do any of these exhaust mods require ECU mods as well? I'm concerned that if I make a change it will screw something up.
As long as the changes are after the last O2 sensor, you won't need a tune. Generally, a "Cat-back" exhaust is after the cats and therefore won't need to be tuned for.
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Old 05-23-2012, 10:22 AM   #36
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Agreed, also, if the reading of the post-cat O2 sensor is correct, regardless of what do you fit, you can leave the ECU alone. The auto-adaptive ability of the ECU will get the A/F ratio, spark advance etc right.
It's rare that a modern ECU of a NA engine is not able to compensate a full exhaust system.

You can have problem if the pre-cat O2 sensor position is very different, for example it happens when you fit a long tube header on a car which had short primary pipes and the original sensor plug very close to the engine. The delay of the reading of the sensor or the different wire lenght confuse the ECU. A good programmer can modify the target of the sensor or the delay of the reading.

This doesn't mean that a ECU remap can't improve the car, as there are also other characteristic of the management that are not subject to auto-adaptation, for example, throttle mapping, rev limiter, valve lift and timing if there is a variable system etc.
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Old 05-23-2012, 03:03 PM   #37
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MAF based cars rarely have issues with any kind of bolt on exhaust pieces. The ECU sees more air flow and the car runs the proper air fuel ratio, so its perfectly. Proof of this is when someone dyno's an exhaust and shows the AFR curve before and after. Like this:



No, that is not the catback dyno results, just an example.
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Old 05-23-2012, 03:26 PM   #38
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Quote:
Originally Posted by RallySport Direct View Post
Prova has a center exit system available

We are working on the details with Prova Japan, however this will also include the new lower rear section as well for the bumper.


I'm not a fan of the muffler and how the pipe is routed, but I wouldn't mind having the rear diffuser and fabricating my own center exit.
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Old 05-23-2012, 04:45 PM   #39
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I'm not a fan of the muffler and how the pipe is routed, but I wouldn't mind having the rear diffuser and fabricating my own center exit.
Not a fan. Makes it look like the car has got it's junk all exposed.
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Old 05-24-2012, 12:08 AM   #40
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Not a fan. Makes it look like the car has got it's junk all exposed.
Meh... the only people complaining about it will be crossing the finish line after I do.
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Old 05-30-2012, 10:02 AM   #41
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I don't like the Prova Muffler set up. I was thinking a race pipe option as well. My brother in law had his BRZ at a performance shop last week where they fabricated intake and various exhaust options... After each part was installed the first initial dyno showed great HP increase levels...(Then the bad news) the ECU quickly remapped everything to only show a 6HP increase with exhaust and intake set up. It appears you can't obtain extra horsepower out of this car without a proper tune.

So hopefully Perrin can come out with something in less than 6 months? Perrin - Have you seen the same results so far? Any thoughts?
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Old 05-30-2012, 08:51 PM   #42
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For sure less than 6 months! A sneak peak for you.



Is there HP to be gained? Yes

Last edited by PERRIN_Jeff; 05-31-2012 at 01:09 AM.
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