Efi options

[Mark Henry]

Originally Posted by jpnovak

The 3.6 intakes have better flow uniformity compared to the 3.2 intakes. Additionally there is a resonance chamber controlled by a flapper valve to change the VE characteristics as a function of rpm.

I would be interested in a plastic version if you are selling. I think Cory (Tippy) and I have the same idea here.

Vario ram would need a EFI EMS system that can support it.

[JohnJL]

I like Adaptronic and use that on one of the cars.

I just picked up an aluminum intake and a complete Tbitz setup for just over $1200. I was planning on assembling and may still go ITB, but that was a good deal and gets me up and running quickly. I havent finished it yet but it seemed like a sound plan at the time...will need to dust off my MS skills....

[Tippy]

Originally Posted by Mark Henry

Vario ram would need a EFI EMS system that can support it.

He's not using it the way you're thinking.

This is already figured out.

[Mark Henry]

Originally Posted by Tippy

He's not using it the way you're thinking.

This is already figured out.

Then do tell, or this one of those proprietary things?

[Mark Henry]

You can build your own intake, even out of mild steel.
Below is a link to a subi 4 cylinder build and a 6 cylinder build, you would have to change the design for the 911 fan, but this does give you an idea of how to do it.

If you don't like the idea of mild steel use stainless.

SDS EM-2: Aircraft

SDS EM-4: Aircraft

[JohnJL]

Originally Posted by Mark Henry

SDS EM-2: Aircraft

SDS EM-4: Aircraft

that some cool stuff right there.

[jpnovak]

The 3.6 manifold will not fit a 3.0 or 3.2 engine. The 3.6 uses a 3-bolt head attachment on the lower injector boss mount. All pre-3.6 911 engines use a two bolt head attachment.

The 3.2 manifold is your choice if you want a single throttle body, common plenum intake system. They bolt on to any earlier engine but the head ports will not directly match. Typically one would taper the intake insulating spacer as a method to smooth airflow without drastically porting the heads for detrimental flow effects.

The 3.6 manifold is unique in that it has runners that drop straight down to the heads. The 3.2 has a curved section directly above the injector boss. The 3.6 manifold works well if you want to adapt it on the top of an individual throttle body setup. This gives you throttle response of ITBs with the longer air path and resonant tuning of the later manifolds for increased mid range torque. Best of both worlds. Nothing secret here. Look at any spec911 or many of the fabulous Rothsport built 911s. Lots of good things going on in that shop.

[Steam Driver]

Thanks for that information; will save me the trouble of retrieving it from storage! I may look for a 3.2, but will probably go with a gutted SC system or ITB's.

[boosted79]

"that some cool stuff right there"

x2. The first and second runner, esp. the first, after the TB will probably be starved though, esp. at higher RPM. At the higher velocity the air tends shoot by the first runners and pack at the rear of the plenum so the first cylinders run rich. Hopefully he's watching EGT on the back cylinders, esp. on a plane. Nice work though. The 3.2 intake tends to mitigate this problem by having 90 deg entrance into each bank plenum from the TB but then there is still some higher flow on cyls. 2 and 5.

[Tippy]

Originally Posted by Steam Driver

Thanks for that information; will save me the trouble of retrieving it from storage! I may look for a 3.2, but will probably go with a gutted SC system or ITB's.

So no interest in parting with 964 intakes?

[Steam Driver]

Possibly; we're thinking about that.

[Raceboy]

With the features available and ease of use and tune, VEMS is by far one of the best systems. Costs just a bit more than 1000usd delivered.
Can use pretty much any sensor you want (no need for proprietary ones) and allows you to use ANY injector/ignition system you want, including 12x COP without any external boxes etc.
Has onboard dual lambda and wonderful strategy for tuning ITB car (alpha-n+hybrid load with boost compensation), be it normally aspirated or boosted.

[Mark Henry]

Never used it, but the south african Gotech MFI is something like $500USD shipped.
I asked, shipping to the US or canada is 1000rand.
It's the lowest price system I've ever seen.

Here is their FB page
https://www.facebook.com/gotechecu/?fref=ts

[mb911]

Gotech seems interesting and know a couple that have used it..

I just really don't want to smell like gas when I eventually drive my conversion.. The webers will probably be used at first and convert later.. Great info everyone.

[chrismorse]

Is there a significant difference between ITB systems and single plenum systems??
Obviously the ITB new would cost more than a used factory plenum but, how much difference is there, is it worth the difference??

chris

[Mark Henry]

Originally Posted by chrismorse

Is there a significant difference between ITB systems and single plenum systems??
Obviously the ITB new would cost more than a used factory plenum but, how much difference is there, is it worth the difference??

chris

See my post number 15 for the short answer to your question.
ITB's and hot cams have poor vacuum and therefore are technically harder to tune.

['76 911S 3.0]

Originally Posted by Mark Henry

See my post number 15 for the short answer to your question.
ITB's and hot cams have poor vacuum and therefore are technically harder to tune.

Not necessarily harder to tune, only if you try to tune using MAP as load. Using TPS as load will make the tuning process much smoother.

[Steam Driver]

Actually, the 3.6 manifold will fit quite nicely on the 3.0 engine, if you have the adapters with injector mounting boss we had made for use at SoK for putting our own manifold on the 3.6. And I have some of those.