Post your ITB Setup

[al lkosmal]

Very cool Jamie.

regards,
al

[Steve@Rennsport]

Here is one system that works very well:

[al lkosmal]

I did make a proto EFI/MFI system on a 3.0 build.....................a slightly different take on it...




There is fire...............

https://www.youtube.com/watch?v=SpPM1SZL_rc

regards,
al

This was really a prototype, as seen in the pix and video....a one-off design to try out a new idea, using aluminum Turbo spacers, machined for EFI injectors, MFI t'bodies (I bored them out to port match) and Weber stax........worked great and I eventually completed the system. However, I was using parts that I had sitting on the shelf for years and while i was building this proto....the price of MFI bits went through the roof, making it not very cost effective approach.

Speaking of old parts, sitting on the shelf....these will be incorporated into an EFI system one of these days.....stay tuned.

[Fly911]

Here is my 3.2L before rebuild, with 48mm Jenveys.

[toddu]

Man I wish I had that muffler!!!!

Todd

[impactbumper]

Originally Posted by Fly911

Here is my 3.2L before rebuild, with 48mm Jenveys.

Fly is that a gt3rs muffler? On a 3.2? Using what headers? Are you using Motec? Thanks


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[umgang]

Originally Posted by Steve@Rennsport

Here is one system that works very well:

Interesting this system does not have the individual "trumpets" for each throttle body but rather a united plenum?
what does that do and what are the advantages Steve?

[impactbumper]

Originally Posted by umgang

Interesting this system does not have the individual "trumpets" for each throttle body but rather a united plenum?

what does that do and what are the advantages Steve?

Better midrange torque, Steve correct me if i am wrong.

Also would this be applicable on 3.2 motors? Another question is a switch over on 4500+ rpm possible like the watercooled cars with this set up?


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[Harry998R]

[sp_cs]

Originally Posted by al lkosmal

Here's a dyno run of the Dzug 3.2SS...the dyno sheet is a composite that shows the before and after. Before is Bosch CIS, after is my x-faktory EFI/ITB system...no other changes were made. (dotted lines are before, solid lines after)

No offence intended as i know little about not very much, but is that dyno plot accurate? That's showing 30-40 bhp/torque gains with your upgrade package? Care to detail the changes?


Has anyone used shaftless ITBs - my engine builder had the below made up and is recommending them due to being able to run narrower bores compared to say Jenveys to maximise midrange - with William Knights input I'm thinking of running them with a 993 intake and t-piece filter as shown by Steve Weiner above.

[tirwin]

This thread is great. I have been wanting to do a ITB/EFI setup for a long time.

I have a curiosity question though. Has anyone ever done an intake plenum with ITBs with a supercharger? Just wondering.

[Mick_D]

I Am leaning toward this kind of setup. I love the look of the ITBs without the air filters though. I'm guessing with this nice-looking plenum setup you get a fairly even torque curve if you cam it correctly?
So many options, so little money...

Originally Posted by Steve@Rennsport

Here is one system that works very well:

[otto in norway]

My setup:




On the dyno:
https://www.youtube.com/watch?v=vPH4HrAljv0

More info:
otto in norway's Garage :: Black bastard

[panzerfaust]

Originally Posted by Fly911

Here is my 3.2L before rebuild, with 48mm Jenveys.

do you find the 48's are a bit large for a street oriented 3.2? how is the low end response ? i have a 964 manifold that im thinking about mating on ITB's on warmed up 3.2. probably not the most cost effective for a street motor but i love the sound, responds and looks of ITB's

Originally Posted by sp_cs

Has anyone used shaftless ITBs - my engine builder had the below made up and is recommending them due to being able to run narrower bores compared to say Jenveys to maximise midrange - with William Knights input I'm thinking of running them with a 993 intake and t-piece filter as shown by Steve Weiner above.

how much smaller? what kind of shaft-less? barrel or guillotine throttle? some arent recommended for street use as i recall due to stiction or wear. most of these systems were strictly race stuff in the past

Originally Posted by Mick_D

I Am leaning toward this kind of setup. I love the look of the ITBs without the air filters though. I'm guessing with this nice-looking plenum setup you get a fairly even torque curve if you cam it correctly?
So many options, so little money...

i think i saw a version with the T-filter hidden away on the front of the motor before? i was at singer's shop and there version had a nicely presented mesh filter in place of those ungainly looking K&N's.

[sp_cs]

Originally Posted by panzerfaust

do you find the 48's are a bit large for a street oriented 3.2? how is the low end response ? i have a 964 manifold that im thinking about mating on ITB's on warmed up 3.2. probably not the most cost effective for a street motor but i love the sound, responds and looks of ITB's







how much smaller? what kind of shaft-less? barrel or guillotine throttle? some arent recommended for street use as i recall due to stiction or wear. most of these systems were strictly race stuff in the past







i think i saw a version with the T-filter hidden away on the front of the motor before? i was at singer's shop and there version had a nicely presented mesh filter in place of those ungainly looking K&N's.

I don't think Flys is a 3.2 anymore, now using 4.0 Gt3 crank IIRC

We're thinking of using 42mm with a gt3 crank and my current 3.4 making 3540cc. I can't recall if barrel or guillotine. FWIW It had a much smoother action than the PMO linkage on another car in his garage, at least when cold.

I think the piece in the pic has to face forwards in cars without tails due to interference ?

[Mick_D]

I have seen the filters/mesh screens on top of the ITBs before. I like that look too.
The big-bore plenum idea is great, and if you have room in teh back under the decklid you can put the air cleaner in back instead of up front.

Originally Posted by panzerfaust

i think i saw a version with the T-filter hidden away on the front of the motor before? i was at singer's shop and there version had a nicely presented mesh filter in place of those ungainly looking K&N's.

[Fly911]

My '87 Carrera is not a 3.2L anymore... All internals are 997 GT3, crank, con rods, oil pump, intermediate shaft and cam gears, etc, etc. The pistons and cylinders are LNE Nickies with 102mm bore and titanium wrist pins. Valves are 993 RSR (on heavily modified heads), 326/318 degrees cams and modified valve rockers. So the 48mm Jenveys will be perfect for the 3.8L. The ECU is Canems from the UK. The muffler is a 997 GT3 4.0 OEM titanium, with Fabspeed RSR headers. The gear box is modified with lower gears, steel synchros and shifter forks, limited slip, etc etc, all from Guards Transmission. The car is now 2,500lbs, but I will get rid of another 300lbs. The goal is 400Hp and 1,000kg (2,200lbs). All on a matching numbers car that looks like factory on the outside...

[Mick_D]

Nothing's original, but the numbers match...

[Fly911]

Mick_D, the engine and gear box cases are still the original, hence a matching numbers car...

[Mick_D]

Sure, that's what I said. nothing-original-but-the-numbers-match.