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Old 03-13-2013, 10:17 AM   #199
Scooby Specialist
Member#: 193757
Join Date: Nov 2008
Chapter/Region: MWSOC
Location: Cedar, MI HP Techs MPS-SSLR2.5
2006 XTI Limited
OBP, Junior tuned 573WHP


Originally Posted by KillerBMotorsport View Post
No. The only thing I can tell you is the turbo sounded more 'chirpy' on light throttle lift and light tip-in felt slightly better. Placebo effect maybe?

Compressor flange is made for a standard 3" silicone tube. Space is tight and this was really the only option because no hard tubing is used on the inlet.

I can't entirely disagree with the performance of our headers in stock location, but you can't compare your setup here. It's VERY different. You've got the long rod block, built D25 heads (with bigger valves to boot) , I'm going to guess no cat as well and probably a bunch of ther stuff too I've got a SB with forged pistons/rods and higher pressure valve springs in the heads with a catted exhaust. That's it. For comparison sake the kit makes more power sooner in the revs than a 3071 on any other kit (rotated or OEM location) I've seen and similar peak power to the bigger 3076. The bolt-on-ness and combination of streetability (super good spool characteristics) with 400whp capability was the goal. Maybe I'm shooting for the wrong demographic?

I read through ALL of it. Not one single before/after dyno. This would have been great to see. More specifically, a plot showing recirc vs to atm

At 400whp I'm not concerned that I'm leaving a lot on the table power wise going recirc. The EWG has a long dump tube, it's is tied into the exhaust at an pleasurable angle, plus it is tied in after the cat.

So the concern is going above 400whp and still being as quiet as the possible. An additional muffler on the gate is not the path I want to take. I'd MUCH rather run exhaust and EWG into a collector and appropriately size up the exhaust from there, say from 3" to 3.5" (or whater the math says it should be). I know the dual muffled setup works, but for some reason it's not tickling me the right way. More thought required

True. The thoery has merit, but I question the effectiveness of 'tratitional rotated twin scroll' setups in Subarus because the secondaries are vastly longer that than the primaries. It seems like the headers were made this way to fit the confines of the available space marketing to the 'must have TS!' market and no one thought to ask "does this setup have gains to warrant the massive price of admission?"

Again... you gotta compare similar setups; pump, stock heads, catted, etc...

Oh I know there's nothing average about Suby owners, we are a quirky crowd In all honesty, that kind of data stays here. Reason being, it opens up a HUGE can of worns. As-is I avoid custom work like it's the plague and providing info like that opens the flood gates to those that want our products "prefect" by "fixing" a miniscule pressure differential across the primaries. I can see the PMs already... "Can you make me a header that doesn't have .00X pressure differential, I need this build to be perfect!" I'd have to lump this in with my ever expanding inbox of "I like the design of your headers, but can you make it with 2" primaries and 2.5" secondaries, I'm shooting for 450whp and those small primaries/secondaries won't flow enough."

For now you'll have to have some faith and trust in that we cross our T's and dot our I's and hopefully the 'outcome data' will be all good.

The TS single WG solution is pretty cool and it might even catch on as a fabrication piece for the DIYers out there. Or at least I think it's cool Our first cast part too. Basically right before the turbine housing it runs a port from each runner to the WG, so the WG port is split into two and runs into the exhaust runners, secondaries. It's tipped at an angle for good flow characteristics (can't say how much I DESPISE WG's stubbed in at 90!). The divider goes into the WG all the way to the WG's valve for minimal cross contamination of gasses. It's made correctly to a T3. I say correctly because I ordered 2 different off-the-shelf T3 flanges and the profiles (specifically the corner radii) did not match the housing . It will also not require the squeezing, hammering or otherwise mashing of tube to fit a T3 flange, because it IS the flange. It goes from round to the rectangular-ish port shape in a nice smooth transition
Chris, You know I a a huge fan and love all my KB stuff! I know you are on the right path with this low mount!! I know it's apples and oranges comparing response and not taking in account for the builds. Yes I have a very different build than most given the power I am making, stock location, TMIC LR 2.5, built heads etc... It would be nice to see your headers on a stock location build, stock heads, 3071, 3076 size turbo.

I still believe your low mount will really shine with the 35r size and bigger turbos. These are the turbos that really need the added help with spool on our Subarus!
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