Bola964

Hi,
I'm restoring a '88 3.2.
Will the MFI from the early cars work?
Do I need too much tinkering with it?
Any help appreciated.
Rodrigo.

psychoideas

MFI is driven from the left cam shaft.
I'm sure if it's installed correctly, it works ok. It was on their race cars!

ron mcatee

Why would you put an MFI on a Motronic engine?

Ed Hughes

No offense meant, but if you're asking this question, my supposition is there is no way you should even consider it. It's apples to oranges.

There is nothing wrong with the stock Motronic system. To try and switch to MFI means you're converting your management from digital to analog, quite a substantial project and VERY expensive. Go search out the cost of the MFI parts, which is just the start. What's wrong with the stock system on your car?

Marine Blue

I wouldn't put an MFI into a modern car at all. Very few people know how to tune or repair them and the parts are very expensive.

budge96

The short answer to your question is no it won't work ,you need to acquire the correct
components for your year and design motor ,
In other words a motronic injection brain and harness ..if you just happened upon some MFI
components inexpensively my advice is to sell them to someone that has the correct engine for the parts and then get the correct items for your car.
If you're just wondering out loud if it makes sense no again..Bert

tcsracing1

is anybody doing stack injection systems on their old 911s?

Steve Weiner-Rennsport Systems

OMG, yes.

We do EFI & MFI versions depending on what a person wants and what their car is. Neither one is cheap to do properly so one really needs to understand this and have a realistic budget.

For the original poster, MFI is quite possible to do on your 3.2 and will certainly provide throttle response and power FAR beyond the OEM Motronic intake system, however its damned expensive and fuel economy isn't great (if that matters).

For general street use, you just can't beat the Motronic system for overall drivability, fuel consumption, and price.

Toby Pennycuff

I built a 2.4L MFI "S" engine for my 1973 911. It is AWESOME! A dyno session once the engine was broken in resulted in HP numbers at the rear wheel that far exceeded factory numbers. I *LOVE* driving that car.

Toby

Bola964

Hi All,

Thank you for your comments. My goal is to get to something similar to the picture below. It was originally a 3.0 1981 engine. Already an eletronic fuel injection system. A Jetronic maybe. I'm not sure. Now it is I understand a MFI with special flutes.

I'd like to have a clean unclustered engine bay with the high flutes look.

I'd like power and reliability, and do not care much about gas mileage.

The only other requirement is that living in Miami, I want A/C so I can drive it any day without sweating my guts out....

Any suggestions and advice will be welcome!

Thanks!
Rodrigo.

Steve Weiner-Rennsport Systems

You are looking at the high-butterfly stacks (from the 2.8/3.0 RSR) being used with Engine Management of some type.

Its entirely possible to do this, however it takes a substantial budget to acquire the stacks, fuel rails, injectors, ECU & harness, install everything and program it properly. You will need air cleaners as well!!!

A/C is possible, however it may require some custom components to fit. The engine lid condenser will no longer fit with that intake.

tcsracing1

Not to hijack the thread, but thanks Steve. Good to know i have somewhere to go to get what i need.
I have been pondering a 72' 911T that has been punched out to 2.7 and has carbs... Would like to go with stack injection and sell the carbs.

Mike_A

not an expert by any means but mfi is for the early cars, probably 2.8 and below. The Bosch units had a distinct part # based on Porsche factory engine displacement, and in order to avoid confusion the qualified mfi shops actually change the # when the units are modified. definitely not an option for your project. Besides , you would not get the appearance you want. This is what one looks like

Ed Hughes

Actually, it is an option, as noted by one of the qualified shops. Whether worth it or applicable, is the question.

Mike_A

Really? for a 3.2? I'd check PFI first, the only "qualified" mfi shop I know. The internals of the pump are the issue