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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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09-21-2013, 10:42 AM | #15 | |
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Thanks man! I think it is stainless, they have more details on the varex website. Road dyno of open vs closed in next post
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09-21-2013, 10:53 AM | #16 |
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FA20club 4-1 Catted Long Tube
So,
The header finally arrived yesterday around 3. There was a slight mix-up, I had ordered non-catted, with extra bung. The secondary that shipped was catted, no extra bung :{ I decided to make lemonade though @FA20Club.com was king enough to agree to let me test the catted section over the weekend and decide if i really want the non-catted... In short, yes, yes i do want the non catted. The varex does such a good job at keeping the volume down when it's closed that i end up leaving it closed most of the time... I'll post some vids in a bit. For now, here is a road dyno comparison of varex closed vs varex open. Exact same stretch of road, 4 minutes apart, no change but pushing the button to open the butterfly. Before anyone complains about road dyno blahh blah.. I over layed back to back runs on my next tune revision and they were almost identical so.. yeah
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09-21-2013, 11:00 AM | #17 |
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A few thought from today's test N tune.. the resonator in the V2 midpipe needs to be longer to get the sound where i want it. I noticed even on the stock header that there are a few raspy spots in the rev range, it's not so bad when the varex is closed, but when it's open, especially with the header, ohh man, heel-toe blips are raspy race car for sure. I think this is mainly due to the length of the midpipe resonator.. it is about 1/3 the length of the factory resonator.
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09-21-2013, 12:15 PM | #19 |
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My setup is completely different. I would not even compare mine to a traditional single exit V2. The varex muffler is nothing like the standard muffler they use so it is not an apples to apples comparison. Not to mention I am on a header and a over / front pipe. If all you are doing is the catback will not sound like mine at all.
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09-21-2013, 07:23 PM | #20 |
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Adding a few clips.. Don't mind the wideband reading, the sensor is not installed right now
[ame="http://youtu.be/62dYM8Fkc5Q"]2700 rpm cruise opening and closing the Varex, windows up.[/ame] [ame="http://youtu.be/sYtxVntJcSI"]Idle Blips in the garage varex open vs closed[/ame] [ame="http://youtu.be/J4fcFv18SHU"]Reving it out in 2nd gear windows up[/ame]
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03-24-2014, 12:35 AM | #21 | |
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05-19-2014, 12:18 PM | #22 |
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BUMP because I'm interested in doing this sort of thing with my car too and want more info. Thanks for posting this up @mad_sb
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05-23-2014, 03:12 AM | #23 |
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im doing something similar. just adding a butterfly valve on one side of the dual exhaust and a quiet muffler to the other side. i hope i can get it super quiet. i really want it dead quiet but i have no cats and full header back exhaust. what quiet mufflers are out there?
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05-23-2014, 03:33 AM | #24 | |
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Would be simple to do.
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05-23-2014, 04:02 AM | #25 | |
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this is what im doing. not exactly like this, i have a different exhaust but u get the idea. |
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05-23-2014, 04:28 AM | #26 | |
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I guess it wouldn't work for you though since you already have a loud set up. It would have been good for someone with the stock exhaust.
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05-23-2014, 05:33 AM | #27 |
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yea you could run stock exhaust with just a dump but then its extremely loud and no back pressure at all
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05-23-2014, 05:43 AM | #28 | |
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Quote:
Don't bring up backpressure, it's irrelevant.
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