hpmotors

Long time owner of a 1980 (yes, its an SA, not a FB ) RX7 with a street ported 13B i got 20 years or so ago from a 1974 RX4 wagon. Car is setup with Racing Beat header and full exhaust, a Racing Beat 4bbl Holley and an electronic distributor from a later FB rx7. My problem is I am really tired of trying to get that holley (a 8007 series antique) to work at around town loads and also work out on top end runs. Seems I can get one or another, but not both. Hence the desire to explore a fuel injection system. I see two options but if more are out there please advise.

Option one is to use the a FC turbo manifold and use the factory fuel injector setup. While the ports on the FC manifold do not line up precisely, they are close enough that a 1" aluminum flange works as a good transition bit. Could power it with a MegaSquirt (lots of experience with the MS1,2 & 3's) or Haltech elite. The latter option is complicated by my belief that the Haltech is a better ecu but I have several MS2's and MS3 kits in my shop.

Option Two is to use the Holley 2bbl 2300 Sniper series which is touted as a complete kit. I';ve talked to the Holley tech folks, and while they are nice folks, seem to have no history of anyone putting they system on a rotary engine.

My question to the forum is has anyone out there done either of these and are they willing to share experiences, pros and cons?

I must admit that this info may be on this forum already, but my old fart computer skills are terribly dated, and I have not found anything yet. If it is online here, please advise how I can locate it.

Thanks for the time in reading this and look forward to hearing back. BTW, the pic on my info is my son's 1987 Turbo II.

Henry
HPMotors
Pelzer SC

dguy

iTrader: (8)

Look into an IDA from somewhere like www.efihardware.com style conversion controlled by an ECU you can have tuned/worked over relatively local - or if you're confident in yourself do it yourself and have it validated remotely. There are plenty of hacks to run the Sniper setup on a rotary but they're far from optimal and I don't like them.

diabolical1

iTrader: (3)

i would say either one of those options are just fine, i think option 2 would probably make more sense given that you already have a Holley manifold. option 1 would be cool because you can get that sort of OEM "look", but the one issue i see with it is injector placement. you won't have primaries. so you'd probably want to address that.

i will assume you can do fabrication yourself (or you have someone that can do it for you) since you even mentioned option 1, in which case i would suggest an option 2.5. that would be get a Holley-style throttle body and see if you can fabricate provisions for injectors, then get a Gen 2 CAS and whatever you need. since you would be fabbing injector provisions anyway, at least you'd skip having to fab the manifold adapter.

as far as the Holley systems go, there are a few of them (or the other one that's a similar setup) on the board and a few on Youtube. the only Youtube one that readily comes to mind is Rad Potential (which i can link if you want), but i have seen at least one other car (that car was a 12A) that ran a Holley system. there's also those two Australian fellows that built a Gen 1 car with one of those self-learn, self-tune systems like the Holley. so if you want to check out running cars to see what you're getting into, then they are out there.