930 EFI Intake Question: stock or 3.2 intake?

hobieboy · 08-15-2005, 02:21 PM

I'm seriously thinking about EFI-ing my 930.

The "general wisdom" is to use a 3.2 Intake, but there are quite a few injector blocks/fuel rail available now to keep the 930 intake. So - which route should I go?

Some pros & cons I thought about - stock intake means it should be an easy swap, but rumors has it it will limit hp to ~475? Going with 3.2 intake seems to take away that concern, but I'll somehow port the head to match (dont really want to do it again since I just rebuild the top end), plus there might be other small items to fabricate?

Please give me some comments & experience!!!

Thanks...

David · David's Garage

You would be a little limited on power, but you could come back and add the Carrera intake if you had to go into the motor. If you converted later you would have to modify your intercooler to fit the Carrera intake and sell the blocks you bought for the injectors, in addition to the head mod. On the other hand, you would already have the other components in place so all the real hard stuff would be behind you.

hobieboy · 08-15-2005, 07:01 PM

Well - the dilemma is that 3.2 intake probably costs about the same as injector blocks/fuel rails, but then there's the extras in doing the heads with the 3.2 intake.
I intend to add a full bay intercooler in any case so whatever I go with, there's the fabrication but hopefully only once.
Wrt hard stuff - other than tuning, did I miss anything major? I thought if I go the stock intake route, its very much "plug-&-play"?

WydRyd · 08-15-2005, 08:10 PM

Save some money and do it right the first time. Match port the Carrera intake to the 930 heads and you'll be right for over 500HP capability.

Of course, it depends on what your ultimate HP goals are for your setup. If u'll be happy with ~475HP, then EFI the existing intake and be done with it.

Trust me, the HP itch will hit you and you'll want more and more.

Go the Carrera route I say.

hobieboy · 08-16-2005, 05:43 AM

Spoke to my mechanic who suggested that it's possible for me to sleeve the 3.2 intake to port match the 930 head. Didnt have a chance to ask how its done but if it can be, it might push me over as my biggest reservation (for the time being

) is to not open up the engine again.

Yes, I know a rebuild is in order probably in a year or 2 given the car is used 99% on track only...

David · David's Garage

It's all the little things you have to do that take time and money. I.E. fuel rails and lines, fuel injectors, pressure regulator, fuel damper, wiring harness, fuel injectors, crank trigger and pickup, cam trigger and pickup if going sequential, temp sensors, MAP sensor, throttle position sensor, etc. Not to mention ignition if you're changing that too.

hobieboy · 08-16-2005, 06:34 AM

Plan is to start with fueling then ignition next as I'll twin plug it then.

With the 3.2 intake, I believe I can re-use the entire "stock" fueling system - pressure regulator, damper, etc.? Only thing to change/add would be injectors and fuel line to connect to my existing fuel filters?

I already have CHT and MAP in my car so its just a matter of connecting the MAP sensor to the proper spot on the intake, I think?

Why would I need a TPS?

thanks...

David · David's Garage

The TPS is for acceleration enrichment.

Here's a thought on spacers to convert from 41mm to 32mm:

hobieboy · 08-16-2005, 10:09 AM

Thanks for the suggestion David...

For TPS - I was thinking about using MAP for enrichment. Essentially enrichment on boost as opposed to throttle position.

Randy Blaylock · 08-16-2005, 10:24 AM

http://www.efi101.com/efi101.html

Do yourself a huge favor and take this class.

There is a lot of info out there, and most of it is tainted by the "this is the way I did it so it's the best way" problem. There are countless ways to do the conversion, it's important to understand ALL the options.

The class will give you a conceptual view of the conversion process so you can make informed decisions.

I learned more in two days, than two years reading just about every forum there is about 930 EFI conversions.

David · David's Garage

I took the class also and I recommend it. I thought the class spent most time on how the ECU calculates the injector pulse width and how to tune the ECU. I didn't think it spent enough time on setting up the EFI system. I realize there's limited time in a day and half class, so I think further research outside of class is needed.

hobieboy · 08-16-2005, 12:57 PM

I always favour formal training but in this case, its time & distance - being up North in Canada makes it a challenge.

Plus I agreed with David - I definitely need to learn EFI basics, but its unfair to expect a "general" course to teach "how to evaluate part X vs Y specifically for application Z".

If I can have it, I'd like to take the BA engine course as well

Hence, the use of forums to get some inputs/comments/experiences about either of the intakes.