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02-07-2020, 10:39 PM | #1 |
Scooby Newbie
Member#: 511131
Join Date: Jan 2020
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102mm ls throttle body to subaru intake manifold
I was wondering if anyone sees a problem doing this
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02-08-2020, 04:33 PM | #2 |
Scooby Newbie
Member#: 62941
Join Date: May 2004
Chapter/Region:
MWSOC
Location: @brgperformance
Vehicle:2004 #LesboRacer #TunedbyBarge |
Besides it being massive?
I'm running an 80mm Hemi throttle body and it's massive compared to stock. 102mm throttle body you're looking at a 4" inlet. I'm all for giving things a shot but 102 seems a bit excessive. My 80 is probably excessive. |
02-09-2020, 12:03 PM | #3 |
Scooby Newbie
Member#: 511131
Join Date: Jan 2020
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Haha yeah probably is excessive I found 1 for $40 so that's why I was curious
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02-13-2020, 04:58 PM | #4 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
We did a Q45 TB on the TIC time attack car and that 90mm TB was more than enough for our GTX3582R at 32 PSI.
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02-24-2020, 06:51 PM | #5 |
Scooby Specialist
Member#: 97043
Join Date: Sep 2005
Chapter/Region:
TXIC
Location: Tomball Tejas
Vehicle:08 STI 02 Z28 - project |
Not worth it IMO. Pretty common to see turbo LS motors running the factory intake manifolds and throttle bodies (86-90mm IIRC).
Guess you could build a manifold to fit the flange then guess correct upper plenum volume, plenum floor height, and runner dimensions. If you're that good, I'd convert to a 4150 style throttle with delayed secondary butterfly. |
02-25-2020, 01:30 PM | #6 |
Scooby Newbie
Member#: 62941
Join Date: May 2004
Chapter/Region:
MWSOC
Location: @brgperformance
Vehicle:2004 #LesboRacer #TunedbyBarge |
Just for comparison this is the flange for my Hemi TB overtop of a stock size TB inlet. I added several rods of filler behind the new flange to fill in thin area or completely ground away holes to get it ported out to size. It would be interesting to see some differential pressure changes across throttle bodies. I have too many other projects I need to get done first though. |
02-25-2020, 03:09 PM | #7 |
Scooby Specialist
Member#: 97043
Join Date: Sep 2005
Chapter/Region:
TXIC
Location: Tomball Tejas
Vehicle:08 STI 02 Z28 - project |
I'd be interested to see how individual cylinder cfm is affected. Uneven flow between cylinders is more dangerous than total flow restriction.
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02-25-2020, 04:29 PM | #8 | |
Scooby Newbie
Member#: 62941
Join Date: May 2004
Chapter/Region:
MWSOC
Location: @brgperformance
Vehicle:2004 #LesboRacer #TunedbyBarge |
Quote:
These NA manifolds seem to have pretty equal flow based on what tests I've seen and hopefully I maintained that. Without individual widebands or EGT I don't really have a good way to say for sure that they're balanced though. |
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02-26-2020, 06:32 PM | #9 |
Scooby Specialist
Member#: 97043
Join Date: Sep 2005
Chapter/Region:
TXIC
Location: Tomball Tejas
Vehicle:08 STI 02 Z28 - project |
Oh didn't realize you're modifying the NA manifold. That would also be my pick for this project. Got anyone local with a flow bench?
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02-27-2020, 04:41 PM | #10 | |
Scooby Newbie
Member#: 62941
Join Date: May 2004
Chapter/Region:
MWSOC
Location: @brgperformance
Vehicle:2004 #LesboRacer #TunedbyBarge |
Quote:
I only have an 80mm though... 102 is way too big hah. I doubt I'll do any flow work on the NA manifold. I've got some ideas to build a custom one so when I get around to that for sure. As said.. runner balance is pretty critical. I recall in the old intake manifold flow comparison some of the high flowing aftermarkets manifolds had pretty terrible runner to runner variation. |
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09-06-2020, 03:16 AM | #11 |
Scooby Specialist
Member#: 179846
Join Date: May 2008
Chapter/Region:
NWIC
Location: Renton, WA
Vehicle:07 STi Limited EFR 8474 TS EWG |
im using Bosch 68mm TB on NA manifold, hole alignment is same and its way better at controlling idle than stock denso unit at 6000 hz.
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09-26-2020, 10:37 PM | #12 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
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AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
68mm Bosch TB from what application? On what NA manifold?
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01-28-2021, 02:50 AM | #13 |
Scooby Specialist
Member#: 179846
Join Date: May 2008
Chapter/Region:
NWIC
Location: Renton, WA
Vehicle:07 STi Limited EFR 8474 TS EWG |
https://www.efisolutions.com.au/bosc...-throttle-body and its 2.5i short runner manifold think i pulled it from forester at junkyard |
06-06-2021, 01:49 PM | #14 | |
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NWIC
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Vehicle:2005 sti silver |
Quote:
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12-12-2023, 03:54 AM | #15 |
Scooby Specialist
Member#: 179846
Join Date: May 2008
Chapter/Region:
NWIC
Location: Renton, WA
Vehicle:07 STi Limited EFR 8474 TS EWG |
ya thread/hole aliment same, just needed to bore out the inlet a bit to match 68mm tb
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