Are there any 8-71 or 6-71 roots type blowers that will work with efi, I've tried searching, maybe it's the wording I tried using but I'm not finding anything, any help would be appreciated.

 

try capa. Just google the name and it will take you to their website. They might have what you are looking for.

 

If you don't find anything, there are other solutions.

Since carbs sit on top of the blower, you can install two Holley Projection - type EFI "carbs" (or the GM, junkard equivalent) and achieve EFI that way.

Or, take the lower intake that the blower attaches to, and drill one hole per runner, tap those holes, and install aluminum VW injector bungs, which are threaded.

Then it's a matter of figuring out which EFI computer you want to use, and GM stuff seems to be the most hacked and fairly inexpensive to "adjust" parameters.

1227730 and 1227749 comes to mind.

If you want ford bits, a 89-93 Mustang (A9P, A9L) EEC comes to mind and use a software like "Tweecer" or similar to adjust your parameters.

And if you like spending money, there's always Motec, Accell EFI, Electromotive Tec II/III, and so on.

 

thanks for the input frederick, you'll have to excuse my lack of all the technical knowledge, but to give you some info it is a 90 460. Is the EFI carb the only thing I need to bolt on to make the supercharger work?

 

Aaah. Well, if you don't have a lot of experience in this area, you may want to acquire a complete system then, as you'll have a higher probability of getting things to work the way you want sooner.

Basically, it's a carb-shaped "thing" that bolts onto an intake of your choosing, but instead of fuel metering jets it has injectors mounted above the throttle plates. GM did this for years, and called it "TBI" EFI. No shortage in junkyards, but you do need something to control the unit so you get the right amount of fuel for your application.
.

As you can see from the above pictures, it looks reasonably like a carbeurator, which means installation (physical mounting) is not very difficult. You might have to make/weld/buy an adapter plate but that in itself is not really a big deal.

You would need an aftermarket ECM (computer) such as the Holley Projection system, or the Access DFI system, two of many choices. Both allow you to attach your laptop and tune reasonable parameters for your engine.

A Holley 4Di Projection system (complete) generally sells for about a grand in the used marketplace (ebay), sometimes a little cheaper. Search ebay for "Holley projection" without the quotes for a more accurate idea, if you wish.

"rolling your own" is more difficult, but significantly cheaper. The GM equivilent of the Holley "carb-shaped injection" thing is very common on cars and trucks from GM. Cadillacs, trucks, station wagons, caprices, etc, all had this system for many years before the EPA started to squeeze the car manufacturers even more. The GM/Chevy truck system like this was available for many V8 engines too.... 305, 350, 454. The latter (454) would probably be the closest to your application.

The GM ECM that will be in any of those trucks aren't too useful, because they aren't programmed to understand above-atmosphere pressures as you would have with a supercharger. There are two good choices. The 1227730 (camaros/transams) and the 1227749 (turbo sunbirds, grandams, and of course the infamous Syclone/Typhoon mini-turbo trucks.

Technically, with minor soldering, the 1227730 can be made into a 1227749, which is really the best OEM choice (in GM-land). The '730's are reasonably common in junkyards as well as ebay, and usually in the $20-35 range or thereabouts. The '749's are much less common and usually draw more dollars because they aren't a "guarrenteed to be there" item. That's why some of us put the effort into figuring out how to convert the 730 to a 749

You can also do this with Ford parts at least as well, however the GM stuff is better reverse engineered in my opinion.

But the latter, "tweek the OEM EFI" solution might not be right for you, if you don't have experience in this area, or desire your vehicle to fire up the first time after you convert it, or don't want to be bothered "futzing" with stuff. There is value in buying a complete aftermarket system and bolting it on, and using the included software to get "reasonably close" to your engine as far as tune, and turn the key on the first day. But, it costs 10-20 times as much. What you're paying for is time - more cash up front, less time in junkyards and on google trying to nail down every detail.

I've converted numerous vehicles to EFI in a variety of ways, and there are advantages and disadvantages to each method. I prefer the "tweak it yourself using junkyard parts" because it fulfills my innate desire to be a cheap bastid and I don't mind spending several weekends (to a year) tweaking and experimenting and trying wild ideas.

Years ago I built a twin-turbo 1975 Dodge D200 pickup, using GM EFI (the 1227749 actually), and the first time I turned the key it didn't start. Took a few weekends (with 9000 annoying interruptions) to get it started. After a year of tuning on and off, I got it tuned to the point where at 55 mph, I could *smoke* the rear tires no problem. And if I wasn't too careful, I could easily litter the highway with tranny, driveshaft, and rear axle parts.

 

thanks for all your input frederic, it was very helpful. And as for the twin turbos, I would love to put those on my truck, but I think it would be a little complicated for me to rig that system up.

 

Turbocharging is often "more complicated" because there is some fabrication required for manifolds. I don't believe K-Mart or Target stocks BBF Turbo manifolds yet

But if you can weld (or offer a friend who can, steaks and beer) it's not that big of a deal either.

Whether you supercharge, or turbocharge, you still have work to do in the tuning department, whether carb or EFI, so as far as I'm concerned, it's all just parts and those parts require effort to make them work together.

 

Is Frederic 'the man' or what?

 

Me? Naaaah. Just a monkey with a dull hacksaw.

 

And an IQ like a zip code!

My girlfriend is convinced,just from reading over my shoulder, that when the earth cracks in half, Frederic is going to weld it back together.

Also, for efi and blowers, to keep this on track:

I have used a company called Force EFI (http://force-efi.com/). We sent them a sbc manifold, and they returned it bunged and ready to go. It turned into a 650 hp hot rod engine. It was not as cheap as Frederic's method, obviously, and it took them awhile, but they did a good job.