Coil on plug setups can handle living under the engine tin on the bottom of the motor. The water pumping cars have their plugs under the sheet metal exposed to whatever bounces off the road. FWIW in an old thread, something like engine config. ideas or along those lines, someone posted pictures of an engine they had built which had the coil on plug setup. Shouldnt be that difficult to have made or too expensive to get valve covers that would work with this type of setup. Even though you arent running plug wires you still have to run wiring to each. Seems like a cool mod.

Do you still need to run them inline with ignitor modules as you would on a coilpack setup though?

Whatever you end up with I am sure it will work just fine. Cheers

EFI is way cool, but takes a lot more time and bucks. Biggest difference is pollution control, better mileage. As to power as long as the af ratio is 12:1 to 13:1 and you have spark at the right total advance your good to go. Might be slight atvantage in hard corners for efi as well. Varying altitude could also be a plus for efi. I personally would go with Motec. Motronic would be better if somebody would ever release an easy way to program them. Best would be coil on plug system that senses what each plug is doing and adjusts the fuel and individual cylinder timing to match. Don't want much do I? Probably the cheepest solution is to buy an engine from a wrecked 2006 Porsche complete with everything.

Time and bucks I agree. If your comparing efi to carbs then you are pretty much right. I bet the ITB's that I am getting flow a lot better than PMO or Webers.

Jack, just curious, with so many options why would you choose motec?

You betcha. :)

They will be on our website when they become available.

Hey Steve, which coil is this going to use?

Cheers

Motec, because so many racers already use it, no other reason.

I always look around to see what other people are doing and using then try to figure out why. It seems this whole Motec phenomenon is still around because from the onset motec was/is a great system and the early efi guys all went motec so that is what they recommend. A lot of race guys use it, a lot of the race cars I have seen look like total pieces of crap with no thought of cleanliness or build quality other than slapping it together, making sure everything works and then flogging around the track in it. OTOH there are some out there that happen to be built so well the panelwork is better than some hot rod street porsches. I dont think there is anything bad about motec whatsoever, simply that it is overpriced and more than you need for anything short of a race motor.

All these little brains need to do is send signals to injectors and coils, analyze input data and adjust its output base upon the parameters that have been programmed into it.

Anyways, who really cares which brain you choose as long as your motor works for you.

On the ITB side has anyone seen the company selling slide valves for porsche motors? I came across it awhile back but now I cant find it. Modern slidevalves with efi sounds like fun.

I'm planning to use Motec because they're the only major ECU supplier that gives knowledgeable support with knowledgeable dealers. I would probably be fine with something else, but I'm not willing to save a $1K at the risk of a $20K motor.

I hear you on that one. I just wish I had the cashola to get one of those TAG/McLaren boxes but at that point I doubt I would be building old air cooled 911's lol.

Just need to get this motor finished and start gathering parts for the next, which will be a bit more inline with my screen name I hope.

Hey Jeff,
I use DTA on my current ride, it is a 993TT 3.8 with all the bells & whistles, I have been using Coil on Plug for some time now (12 of them), what I use, and its been very good as of now, is the Sea Doo's
(4 cycle) coils, they are really tuff, with a nice tight fit on the valve covers, plus they have a low profile on the outside, this thing is delivering 680hp @ 1.2 bars. at the wheels without any hicups, if you go by this route try to use DTA by all means, also this unit has provision for launch control and traction control, a plus in the track, specially when in low traction conditions, at dusty or dirty tracks, this unit has lots of things to offer and tuning with it is a piece of cake, you can hook up with Wayne Seixas at TPG products, he is the east coast distributor for it, and he has tune lots of Porsches with it, he is really good tuning them and can provide you lots of advise., kind regards, Antonio.

Motec seem to be the best but you certainly pay for it. I know a few guys that have used Autronic, and they swear by it. It's a lot cheaper than Motec as well. Here in Australia we are blessed with an abundance of good quality EFI systems - Motec, Autronic, EMS, Haltech just to name a few. They all work well and the only difference seems to be how user friendly the tuning software is and what facilities they offer. Most have some form of autotune feature. Nearly all provide logging. There is no magic in tuning any of these systems. You just have to understand the software, and make sure all the sensors, injectors etc are working correctly. You can get a pretty good initial tune just by logging and tuning on the street. If you want to push it, then you are going to need a dyno, and someone that knows how to operate it. As for coil on plug ignitions, I thought that this would be a realy neat setup for my turbo, but apparently not so. There is a good discussion on the EFI University forum Tuning tips http://www.efi101.com/forum/viewtopic.php?t=390 that discusses the merits of CDI versus coil on plug. You can make your own judgement, but the argument for CDI seems pretty strong.

Great link Paul!