924Board.org

AznDrgn · Guest

Was reading up on your EFI conversion on the projects page and I was wondering how that project was coming along. I'm thinking about getting some money together and going down that road myself and was hoping to get some more details about the project and it's results.

Thanks

Benski · Guest

I've been pondering over an EFI setup also. Seems reasonably feasible. I was thinking about getting an individual throttle body setup from TWM - http://www.twminduction.com - and the computer from electromotive. The project is just in the research phase and may be many months or a year before I get the money and motivation to start.

Let me know what your thoughts were on an EFI conversion

-benski

TroyDest · Guest

I spoke with David Ewing a couple months ago and he was still working on his system. He was kind enough to send me some pictures of his installation. He's cool.

As far as EFI goes...it's the way to go if you can. I live in California where they frown if you have a braided line going to a boost guage in the dash of if you have an air/fuel gauge! There's no way I could get away with an EFI conversion. I would if I could. Check out SDSEFI.com; it's a very friendly website. Their system is simple (hence the name of the company) and economical.

I'm not sure if individual throttle bodies would have any benefit on a turbo engine. It would be a pain to plumb 'cause you'd have to join the four inlets together for the turbo boost. I do think moving the injectors away from the head would be beneficial though, for atomization and heat reasons. I think Peter Utzon would be the person to ask about throttle bodies since it looks like that what he has in mind for his 924 Carrera GTR engine (in the models and history page of 924.org).

Just my opinion. -Troy

Benski · Guest

I had the individual throttles in mind for an N/A setup. I agree it would be needlessly complex for a turbo. Maybe the existing intake manifold could be machined for injectors + a fuel rail.

The one thing I didn't like about the SDS system was the batch-injection. If I'm going to go through all the trouble of putting an EFI system on then, god damnit, I want sequential injection.

TroyDest · Guest

Benski, good point. I'm a little squeemish about CIS and batch injection also. Sequential injection just makes more sense for power. -Troy

Cbass · Guest

http://www.jmengines.com

This guy has a very nice intake manifold. It uses barrel valves, one for each cylinder. I think he has integrated the fuel injection into it too, but don't quote me on it.

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

barrel valves are at the pointy end of the technology, hence the price.

Take a look at a couple of my posts in the Links forum:

Quad throttle bodies http://www.924board.org/viewtopic.php?topic=1714&forum=11&0 these bolt up to weber carb manifolds but the price is right, around $1300 Australian which is around $700 US. They come with everything you need except injectors.

These might also be relevant http://www.924board.org/viewtopic.php?topic=1712&forum=11&0 and http://www.924board.org/viewtopic.php?topic=1716&forum=11&

[ This Message was edited by: Peter_in_AU on 2002-04-06 11:08 ]

jamez · Guest

http://www.sdsefi.com/techseq.htm

heres what SDS has to say about sequential injection

Cbass · Guest

Give me 6 months and I'll be fabbing up some clones of the barrel valve system. Good ol JM doesn't have an internation patent it seems, and I live in Canada

Benski · Guest

jamez,

SDS's explanation is a copout. They are basically saying "batch injection works as well at full throttle and high rpm so why bother?"

That's the same reason why a big racing carbs have good performance.

But the real reason we want an EFI system is not just more power but also better drivability and gas mileage!

Cbass · Guest

Well, yes. That too. But mostly the power. I figure if we're going to the trouble of shelling out thousands for an EFI setup, why the hell should we have to settle for second rate?

BTW, the barrel valve intake goes for $4500. Ouch.

Alex Roy · Guest

the SDS system looks pretty darned slick, after looking at their stuff I am considering reselling my Haltech and getting an SDS (especially since I haven't installed the Haltech fully yet).

If you are H311 bent on sequential injectors, the new Haltech E6k does bank, sequential, multipoint, and staged, all out of the box, but the ECU is $1400 without any of the extra options.

AppleBit · Joined: 16 Nov 2002 Posts: 1516 Location: Minneapolis, MN

I've got my car running well with the stock CIS system. Yes, perhaps I will go to a more modern fuel injection setup someday, but I do not believe for the money you will see a big increase in power or drivability because the CIS was so advanced for it's day! It still works fine.

The reason for me to change will inevitably be because the intake path is inefficent. Too many bends in the intake path.

- Jon McCullough

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

Alex, that's outrageous, $1400 for an E6K! I presume that you're talking USD. An E6K down here is $1495 recommended (max) retail and thats $Oz which us about US$800. Someone's making a killing and I bet it's not Haltech Australia.

Cbass · Guest

Note to self, buy ECU from Australia. Even I have a stonger dollar than you Australians.

If you think thats outrageous, price a Motec. try $6000+