Post your ITB Setup

[sbrown.nw]

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

Originally Posted by BLACK3.2

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]

Originally Posted by sbrown.nw

... with rain hats.

Scott

I just switch from the rain hats...

[/QUOTE]

[sbrown.nw]

Why? Did they not work well? Not sure if those ITG filters will fit Al's kit. Where did you get them?

Thanks,

Scott

Originally Posted by JJ 911SC

I just switch from the rain hats...

[/QUOTE]

[antares]

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]

Originally Posted by sbrown.nw

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&products_id=179

[JJ 911SC]

Previous versions...

Rain Shield



Race Top



Flat Top Filter on Flute



Half Tea Ball Filter on Flute

[winders]

The ITG filters seem to make the most power while still providing enough filtering.

[Jeff Alton]

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]

What’s the consensus of shaftless (AT Power) versus others with a shaft/butterfly?

[winders]

You mean these:



They work really well.

What is your application?

[fetus]

Street stock Euro 3.2. Want reliability but miss the sound of the Weber’s

[winders]

They won't pass the visual inspection CA smog...is that an issue?

[fetus]

Originally Posted by winders

They won't pass the visual inspection CA smog...is that an issue?

No, it’s a 75 car

[winders]

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]

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

Originally Posted by JJ 911SC

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

[JJ 911SC]

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

Originally Posted by sbrown.nw

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]

Originally Posted by winders

You mean these:



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]

Originally Posted by 1970 911

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]

And so it begins...





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]

Scott,
I noticed this WTB last night....

WTB 3.2 or 3.6 Intake.

regards,
al