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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   Post your ITB Setup (http://forums.pelicanparts.com/porsche-911-technical-forum/925845-post-your-itb-setup.html)

sbrown.nw 03-09-2021 11:13 AM
Interesting and thanks. Yes, I will be dropping my 3.2 targa off this Saturday for Al to install his Option 2 EFI ITB kit with rain hats.

Scott

Quote:
Originally Posted by BLACK3.2 (Post 11254009)
It turned out great. It has an RS cam and 3.8 build 7K miles ago from a previous owner, as well as close ratio gearbox and LSD, but stock exhaust (except with secondary muffler delete) and stock intake. Al installed the Rasant ITB kit along with headers and a valved Ti 991 GT3 center exit muffler. Overall it is MUCH smoother than before. The ITBs can clearly handle much more cam. It went from feeling like an old school race car to more like the stock GT3s I’ve driven.

The car is quieter at idle and cruise. The exhaust note is higher pitched. It roars when you add throttle/load and the valves open.

The car has really come alive in the mid range and up. The part throttle response is incredible. I felt it most often when weaving between cars on the freeway, but tbh I haven't driven it that much because the rear bumper is still off. It goes to the body shop in two weeks for the rear bumper to be modified to accommodate the new center exit exhaust.

As to intake sound, I think the GT3 plenum mutes that considerably. I do get some brilliant new intake notes when I come off throttle. If you want intake sound then suggest you go with trumpets.

JJ 911SC 03-09-2021 12:27 PM
Quote:
Originally Posted by sbrown.nw (Post 11254028)
... with rain hats.

Scott
I just switch from the rain hats...

http://forums.pelicanparts.com/uploa...1615324948.JPG[/QUOTE]

sbrown.nw 03-09-2021 12:54 PM
Why? Did they not work well? Not sure if those ITG filters will fit Al's kit. Where did you get them?

Thanks,

Scott

Quote:
Originally Posted by JJ 911SC (Post 11254113)
I just switch from the rain hats...

http://forums.pelicanparts.com/uploa...1615324948.JPG
[/QUOTE]

antares 03-10-2021 09:29 PM
Guess your setup kinda goes like this. With all other things being the same If you want to get more power at higher rpm's then use shorter length yet wider intake runners ... If however you are wanting more power and response at overall lower rpm's then use longer intake runners that are more restrictive / narrower to create a more turbulence effect for increased airflow /velocity.

JJ 911SC 03-13-2021 07:52 AM
Quote:
Originally Posted by sbrown.nw (Post 11254140)
Why? Did they not work well? Not sure if those ITG filters will fit Al's kit. Where did you get them?

Thanks,

Scott
For the look... Got them from https://www.clewett.com/index.php?main_page=product_info&cPath=4_48&produc ts_id=179

JJ 911SC 03-13-2021 07:57 AM
Previous versions...

Rain Shield

http://forums.pelicanparts.com/uploa...1372124362.jpg

Race Top

http://forums.pelicanparts.com/uploa...1389560929.jpg

Flat Top Filter on Flute

http://forums.pelicanparts.com/uploa...1395525938.jpg

Half Tea Ball Filter on Flute

http://forums.pelicanparts.com/uploa...1399510787.jpg

winders 03-13-2021 11:19 AM
The ITG filters seem to make the most power while still providing enough filtering.

Jeff Alton 03-13-2021 08:24 PM
A few years ago we had a 3.5 on the dyno with PMO ITBs. We had the chance to dyno 2 different set ups. I don't have the sheets, like I said, it was a few years ago. But, we tested the often thought of restrictive "rain hat" set up vs open velocity stacks with no filter. The thought of "worst" vs the "best" in terms of power. We saw no measurable difference on that particular motor. Yes, one sample size done back to back within an hour of each run. We did post something regarding that tidbit at the time. For years there was lots of hyperbole about what filter flowed best and what cost you power. Lots of "white paper" type thinking. So we had the chance to do a ONE time test with ONE motor combo, so we did.

A filter on an ITB motor hurting performance means everything else in the complete engine system is dialed to 110% and drawing more air than the filter can deliver without restriction.

I wish we still had the dyno plots. Maybe we will going forward with engines that see the dyno...

Anyways, food for thought.

fetus 03-14-2021 09:13 AM
What’s the consensus of shaftless (AT Power) versus others with a shaft/butterfly?

winders 03-14-2021 10:24 AM
You mean these:

http://forums.pelicanparts.com/uploa...1615746245.jpg

They work really well.

What is your application?

fetus 03-14-2021 10:28 AM
Street stock Euro 3.2. Want reliability but miss the sound of the Weber’s

winders 03-14-2021 10:35 AM
They won't pass the visual inspection CA smog...is that an issue?

fetus 03-14-2021 10:46 AM
Quote:
Originally Posted by winders (Post 11259440)
They won't pass the visual inspection CA smog...is that an issue?
No, it’s a 75 car

winders 03-14-2021 10:58 AM
That's cool.....

I would contact William Knight (knightrace at mac.com). He can tell you what ITB size (I assume 42mm) and intake port size would work best and get your a quote.

sbrown.nw 03-15-2021 07:38 AM
Do you have an EFI ITB kit from x-faktory / Al? How well do the ITG foam filters hold up to keeping rain out of the intakes? Does the foam get saturated in a heavy rain?

Thanks,

Scott

Quote:
Originally Posted by JJ 911SC (Post 11258393)

JJ 911SC 03-15-2021 04:49 PM
Hi Scott,

My kit are PMO EFI. As for the ITG foam filter, it will be the first time I will run them on the road.

As for water in the rain... I drove with the top down in a piss down rain at 60 mph and thanks to physic, I did not get a drop in the cab so I doubt anything happened in the engine bay.

JJ

Quote:
Originally Posted by sbrown.nw (Post 11260201)
Do you have an EFI ITB kit from x-faktory / Al? How well do the ITG foam filters hold up to keeping rain out of the intakes? Does the foam get saturated in a heavy rain?

Thanks,

Scott

1970 911 03-15-2021 06:26 PM
Quote:
Originally Posted by winders (Post 11259426)
You mean these:

http://forums.pelicanparts.com/uploa...1615746245.jpg

They work really well.

What is your application?
Would love to see some more photos of this beast. Do you have a build thread?
Dean

winders 03-15-2021 07:29 PM
Quote:
Originally Posted by 1970 911 (Post 11261103)
Would love to see some more photos of this beast. Do you have a build thread?
Dean
I have other photos but no build thread. What, specifically, are you interested in seeing?

sbrown.nw 03-16-2021 08:05 AM
And so it begins...

http://forums.pelicanparts.com/uploa...1615910601.jpg

http://forums.pelicanparts.com/uploa...1615910615.jpg

FYI, I will be selling the following from this upgrade:
- basically everything you see removed between the two pictures (the full euro factory intake system with the aftermarket filter and tube)
- DME, wiring harness and Steve Wong euro chip

Send me an email if you are interested to purchase the above,

Scott

al lkosmal 03-16-2021 08:25 AM
Scott,
I noticed this WTB last night....

http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/1088446-wtb-3-2-3-6-intake.html

regards,
al


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