PMO EFI for a 993 3.6 Engine

[shahram]

I am very tempted to buy one of these PMO EFI TBs and to install them on my 3.6 converion Engine.
Would the EFI setup run with the regular 993 motronic or do I need to get a different ECU setup?

[burgundyben]

Why?

I'm interested in what benefit it might bring.

[shahram]

I like the clean old style look and would like to get rid of the Vario ram complexity and look in my engine bay.

[Steve@Rennsport]

You will need Engine Management to use the PMO ITB's: the Motronic system cannot be mapped to use them.

I'd likely not do this unless you have the resources to buy a high-end Engine Management so you can retain the knock-sensor ignition feature, given that you likely use pump gas all the time.

Its all doable as long as you have the $$$$ to do this properly.

[burgundyben]

Originally Posted by shahram

I like the clean old style look and would like to get rid of the Vario ram complexity and look in my engine bay.

I can understand that.

Seems like a lot of money to spend for little improvement in the car.

[1980 911 sc]

The up side is trottle response will be much improved and more potential top end power.
However theree aremany pitfalls...even if you can figure out how to convert trottle position to MAF input, which I am sure it no small feat, you will have a lower torque curve especially at lowwer RPM's unless you change cams etc and get the ECU remapped or more likely replaced.

[paulgtr]

might be cheaper to buy and old engine with that cleaner look. or just go with carbs?

[shahram]

Well, I was also thinking abouth PMO Carbs, but even with carbs I have to go with another ECU set up, right?
I would consider the EFIs only if I could keep the motronic but that seems not possible, Thank you much Steve for clarifying that for me.

[brads911sc]

You are going to dump EFI for carbs? This will be a big step back in many ways.

I have PMO ITB's / EFI. Would never consider going carbs... or back to CIS.

[Brando]

Unless you're changing cams too, I doubt you would see much of an improvement over the Motronic system.

[Steve@Rennsport]

Originally Posted by Brando

Unless you're changing cams too, I doubt you would see much of an improvement over the Motronic system.

Oh yes, you sure will as the throttle response difference between the Varioram and the ITB's is night & day, but this sort of project is NOT cheap to do, correctly.

Unless this is a race car, I'd recommend sticking with the Motronic and the Varioram as these things work very very well with lots of room for software improvements. Further, this runs well with any kind of gasolines, especially in hot weather.

[911st]

I am not sure if he will do it with the MAF Motronics but with the AFM Motronics (to 94) Protomotove can convert it to MAP so it will work with ITB's. Something like $2500 on the Motronics to get you started but you will need to dial in the final tune. Still not for the faint at heart.

A new stand alone high end EFI and the help of a good tuner to set it up as noted is a better idea.

I would just put a good exhaust and chip on what you have like Steve said.

[Brando]

Steve,
I should have specified... If he keeps the system in place but installs a converter/interpreter for MAP, he will not see a significant difference in hp.

Removing it all and going with a PEFI system and ITBs is what opens the doorway to beyond and better than the stock motronic system and parts in place. Replacing half the equipment and a "bandaid" will not achieve the results he is looking for.

Originally Posted by Steve@Rennsport

Oh yes, you sure will as the throttle response difference between the Varioram and the ITB's is night & day, but this sort of project is NOT cheap to do, correctly.

Unless this is a race car, I'd recommend sticking with the Motronic and the Varioram as these things work very very well with lots of room for software improvements. Further, this runs well with any kind of gasolines, especially in hot weather.

[jpnovak]

What about doing a MAP conversion on the Motronic and then using an emulator to remap the motor? Do a search for TunerPro. This has been done extensively with 944/951 applications.

I agree that ITBs alone will not be the best option.