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Old 02-07-2018, 12:37 AM   #26
cosbySweater
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I will say this, if the car is a daily, a b230f+t, t cam, and 15g is a very fun and drivable combo
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Old 02-07-2018, 01:27 AM   #27
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I will say this, if the car is a daily, a b230f+t, t cam, and 15g is a very fun and drivable combo
But what if I want more.
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Old 02-07-2018, 05:56 AM   #28
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You could always rebuild your 15G with a bigger coldside (20T?) - supposed to be an upgrade.
Tim
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Old 02-07-2018, 07:24 AM   #29
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and you could pay some serious attention to port matching the exhaust side from head to manifold, from manifold to turbine housing, the wastegate port (cost: some good quality diegrinder tools and your own time and input) and offcourse use a nice freeflowing downpipe and exhaust.(at least 2.5") You want to have the biggest pressure drop from manifold to downpipe.
The easier the turbine can get rid of the exhaust gasses, the faster it will spool up. The easier the exhaust gasses can flow into the turbine, the faster it will spool up.
All this detail work will reduce lag and make the turbo spool up quicker and respond to different throttle inputs faster.
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Old 02-07-2018, 08:14 AM   #30
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and you could pay some serious attention to port matching the exhaust side from head to manifold,don't do this! from manifold to turbine housing,I have a different opinion too at this point the wastegate port YES!(cost: some good quality diegrinder tools and your own time and input) and offcourse use a nice freeflowing downpipe and exhaust.(at least 2.5")Most important, better a 3" downpipe and cat, after cat 2,5" is enough You want to have the biggest pressure drop from manifold to downpipe.
The easier the turbine can get rid of the exhaust gasses, the faster it will spool up. The easier the exhaust gasses can flow into the turbine, the faster it will spool up.
All this detail work will reduce lag and make the turbo spool up quicker and respond to different throttle inputs faster.

And again, a lot of people think in a other way than I do. And they never did a test on the dyno or the flow bench.
Regards, Kay
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Old 02-07-2018, 08:31 AM   #31
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And again, a lot of people think in a other way than I do. And they never did a test on the dyno or the flow bench.
Regards, Kay
So you are saying an un-ported manifold out performed a manifold with ported flanges while all things were kept equal? What was the rest of your engine setup?
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Old 02-07-2018, 08:42 AM   #32
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Originally Posted by LeedomtoFreedom View Post
But what if I want more.
Money, goal, time, knowledge, what do you have?
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Old 02-07-2018, 12:06 PM   #33
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And again, a lot of people think in a other way than I do. And they never did a test on the dyno or the flow bench.
Regards, Kay
I want to hear more from you, what is your theory

Addendum - I have the 3" angled hotside and 3" exhaust all the way from downpipe, all made by me, so you know it's quality
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Old 02-07-2018, 12:41 PM   #34
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Look at t3 flanged gt28s or tial vbanded gt28s. Gotta pay to play, but holyfuk do they just feel good. A buddy ran mitsus for years on his Saab, most recent was a td04hl-16t (Volvo) with an angled flange off a diy t3 log manifold. Spool was great, but in 4th at 1800-2000, you’d stomp on the throttle and get a good 3 count before 18psi was reached. Swapped to a gt2871rs, with a t3>3” vband hot side and now it just feels like it’s loaded with crazy na power. I can get a 1 out before 18psi, sometimes a 2 count.
Truth. If you have a spare $1500 to spend on a turbo, a gt2871rs is the way to go.
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Old 02-07-2018, 12:50 PM   #35
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I've been really happy with my BW EFR. Super slick and tidy internal WG dual scroll with built in boost control valve and CBV.
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Old 02-07-2018, 01:43 PM   #36
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I've been really happy with my BW EFR. Super slick and tidy internal WG dual scroll with built in boost control valve and CBV.
they are very nice units.
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Old 02-07-2018, 01:47 PM   #37
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Originally Posted by Sjeng View Post
So you are saying an un-ported manifold out performed a manifold with ported flanges while all things were kept equal? What was the rest of your engine setup?
to a certain extent, this would be expected behavior. if all you do is hog out the area around the flange, what you're doing is creating a balloon in the middle.
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Old 02-07-2018, 09:43 PM   #38
megulon-7
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I've been really happy with my BW EFR. Super slick and tidy internal WG dual scroll with built in boost control valve and CBV.
which one?

I was interested in these when they came out, but heard they had issues with the early production...
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