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Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,495
Sizing ITB's for boost and IC configuring?

So, I know the conventional wisdom is bigger the better for NA applications where all out max hp is required (until point of diminishing returns), but what about boosted applications?

I have a Carrera 3.2 (3.4) with stock intake port sizes (42mm IIRC) and I believe the OEM 3.2 intake are the same throughout until the runners meet the log parts of the manifold (assuming here?).

So, question is, do you run like a 44mm ITB (account for butterfly area diminished to get back to 42mm total area) or something like 50mm plus?

My brain is saying something like 44mm for good driveability (high velocity) but I see so many ITB's out there far larger making me have doubts.

Also, trying to figure configuring existing IC I have to work or if I'll have to go with a totally different end tank arrangement?
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 03-16-2014, 07:12 AM
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Well mine isnt running yet. but i went with 43mm throttle bodies. my heads are ported to 41.6mm. The inlets are about 45mm the air horns going to the throttles are 80mm tapers down to 45mm. Jenevey recomended tapered throttle bodies. didnt get those but probably should have.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue

Last edited by Ken911; 03-16-2014 at 01:33 PM..
Old 03-16-2014, 01:30 PM
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Chain fence eating turbo
 
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So yours are basically 45 down to 43? Was yours configured to a particular proven build or hp range?

Just curious where to get data from. Jenvey didn't really answer my questions since they speak of NA mostly from what I gather.
Old 03-16-2014, 03:24 PM
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Yes it's a 45 down to a 43 then the manifolds are 43 down to 41.6. Not a proven build spent a lot of time on the phone with Chris at TK. Plus the guys at extreme when they were porting my heads. Looking for 650 at the wheels. I was not able to use the jenvey manifolds because they are too tall so I built my own. They are 1.5 inches tall
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue

Last edited by Ken911; 03-16-2014 at 09:43 PM..
Old 03-16-2014, 09:27 PM
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here is a quick pic of the height

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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue
Old 03-16-2014, 09:44 PM
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Chain fence eating turbo
 
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Thanks Ken!
Old 03-17-2014, 03:57 AM
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What brand of t-bodies do you have?
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Old 03-17-2014, 10:10 AM
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You may want to send rsscotty a PM. He is with Rothsport and they have done some ITB turbo builds.

Rothsport 3.4 , ITB, Garrett GT35R build
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Old 03-17-2014, 10:11 AM
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That's a great build. Stupendous drivability from a 3.4L.

Love those trumpets, plenums, and intercooler. ;-)
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Old 03-17-2014, 10:49 AM
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Chain fence eating turbo
 
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Quote:
What brand of t-bodies do you have?
GSXR 750. Remeasured and they neck down to 38mm. No bueno. I see Hayabusa's run bigger, may look into those.
Old 03-17-2014, 03:31 PM
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Chain fence eating turbo
 
Join Date: Dec 2008
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Quote:
You may want to send rsscotty a PM. He is with Rothsport and they have done some ITB turbo builds.



Rothsport 3.4 , ITB, Garrett GT35R build
Thanks, known of them before. Going on the DIY (a.k.a. cheap) route.

There are plenty of sportbike throttlebodies folks have been successful with.

It's just I have bigger ports over the 930's or other older 911's that weren't boosted.

Didn't have a solid reference.
Old 03-17-2014, 03:37 PM
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If their throttles are 42mm, can the port below the throttle be machined out to match your Carrera ports?
And still leave a flange for a gasket to seal?
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Old 03-17-2014, 04:16 PM
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Chain fence eating turbo
 
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Quote:
Originally Posted by TurboKraft View Post
If their throttles are 42mm, can the port below the throttle be machined out to match your Carrera ports?
And still leave a flange for a gasket to seal?
Unfortunately not.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 03-17-2014, 05:15 PM
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before i bought the jenvey throttle bodies I looked quite a while for some sport bike ones. I couldnt find anything that would work. they were either more expensive, too tall, wrong bore size, or not configured so that they could be set up in banks of three. I bought the ones from jenvey, then several months later the linkage and the horns. But even those you have to buy the regular ones not the short ones because the porsche linkage set up they have doesnt work with the short itb's.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue

Last edited by Ken911; 03-17-2014 at 11:43 PM..
Old 03-17-2014, 11:28 PM
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Chain fence eating turbo
 
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Ken, the Suzuki Hayabusa (1300cc) ones are singles you can separate and have a nice set of features to support them with rods and spacers to whatever widths you want.

They are 46mm up until 2008.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 03-18-2014, 11:27 AM
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Garage
You too Tippy?

Man, I feel left behind with the crap I am struggling with.

Looking forward to following your progress.
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Old 03-18-2014, 01:19 PM
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