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I can attest to an increase in driveability after installing the flap. In low RPM (sub 3.5k) it does feel like it pulls a bit better with the flap closed. It isn't a night and day difference, but I certainly noticed a difference after expecting not to feel any difference whatsoever after install.
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Originally posted by usdmej View Post
the changes Karbonius has made over the years seem to address their own mfg issues more than make any improvement over an oe box
Can't speak on turners box claims but their graph claiming gains over oe was suspect to say the least
Not saying these are groundbreaking changes/gains, but, if it's even *somewhat* improved over the OE piece and looks identical, I would take the Karb over OE even if their costs were in the same ballpark. That's just me.
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Originally posted by Obioban View Post
every dyno I've even seen posted shows the engine making less horsepower and torque with the flap closed than open
In partial throttle low rpm driving driveability is noticeably better with the flap closed
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Originally posted by ATB88 View Post
Karbonius and other companies (TMS) have either improved upon or changed the design for better airflow.
Can't speak on turners box claims but their graph claiming gains over oe was suspect to say the least
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Originally posted by x Spades x View Post
The flap is mainly used for low end driveability (box vaccuum - consistent throttle response), low end torque. When I installed my flap, it was a noticeable difference. I have the flap opening at 5.5k 1st gears, 3.5 2and gear, and 2.5 all other gears.
Drivability... I've never noticed any difference. Hard to imagine a snap change (as there's no way to modulate the speed of the flap opening) improving drivability
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Originally posted by Nick_P View PostInterested in hearing thoughts on this as well. Between Karbonius and Evolve are there any big differences or just splitting hairs? Considering one doesn't intend to run the flap?
Ehhh, I haven't seen one started yet?, and I'm not the guy that's gonna do it...but we need another dyno thread! EDIT: Is everyone ok w/this being the official dyno thread moving forward? Ok, well, I guess that this will serve as the new Official Dyno Database-by default.:D All graphs are welcome, but plz try to include as
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Originally posted by Obioban View Post
And the evolve box is a copy of the oem box I’m running.
IMO the best thing about the flap is that it looks stock. If I had one, I’d code it to be open 100% of the time, as every dyno I’ve seen has it closed only hurting power.
If you don’t mind the not stock look, and are going to run it open, the evolve/karbonius race makes sense imo... which is why I’m running it (albeit the oem version).
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Originally posted by T.J. View Post
What is its story?
So, OEM (original equipment manufacturer) CSL airbox with race style ducting
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Originally posted by Motorsportdreams View PostThe race variant would render the front air duct behind the kidney grills useless. Would a scoop like evolves be sufficient to funnel air to the airbox? Also any cheaper scoops out there. The scoop seems pricey for a little piece of carbon fiber.
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Originally posted by Obioban View Post
And the evolve box is a copy of the oem box I’m running.
IMO the best thing about the flap is that it looks stock. If I had one, I’d code it to be open 100% of the time, as every dyno I’ve seen has it closed only hurting power.
If you don’t mind the not stock look, and are going to run it open, the evolve/karbonius race makes sense imo... which is why I’m running it (albeit the oem version).
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The race variant would render the front air duct behind the kidney grills useless. Would a scoop like evolves be sufficient to funnel air to the airbox? Also any cheaper scoops out there. The scoop seems pricey for a little piece of carbon fiber.
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