Years ago, my brother and myself put a 13B turbo into an AE86, it was GREAT fun, ran a 12.5 at the drags, cheap, easy and FAST. We used a Haltec fuel only ecu, 12A turbo distributor and front cover(distributor has retard on boost function) it cost bugger all and went fast.

Sundee86 I disagree with the NA rotor making about half the torque of a piston engine in the SAME capacity, as you would know a 12A is roughly 1.2litre SWEPT DISPLACEMENT and a 13B 1.3 litres. They make MUCH more torque than an engine of the SAME capacity, hence the greater output compared to engines of the same capacity.

My background is actually rotors, I use to build lots of em back in the late 80's early 90's, mainly NA, BP's and PP's, alot went to Sports Sedans, they deliver a very flat torque curve over a HUGE rev range.

Alot of people bag ported rotors saying they have to idle at say 2000rpm this is also crap, and to me is a rotor not set up correctly. My daily back then was an RX3 coupe with a 13B PP, even on a weber carb(later autronic efi) it idled at 800rpm! alot of people couldn't believe it was PP! and it would pull hard thru to the high 10's, I usually used around 10,300rpm. It made about 180ftlb of torque at about 9500rpm(long time ago, trying to remember) with this 180ftlb of torque over a VERY large rev range an NA 4age would not even get close!

I remember once I was in a petrol station putting fuel in the RX3(this use to happen on a VERY regular basis ) any way another RX3 pulls in romping(term we use to use for lumpy idle) it's arse off, any way the guy hears mine and after filling up he comes over and asks what I'm running (he said he was running a monster) he says it sounds like a small bridge(due to the low idle speed) I said "No mate it's a PP", he says "sure it is, do you know what a PP is?"
I reply "I hope so, I machined the housings and built the engine", his jaw drops as I open the bonnet, sure enough it's PP, he asked how I got it to idle so well, I told him that the weber IDA is a very adjustable carb and not many people really know how to set them up right.

If you want to go a rotor, why not, I would go a rotor over say an SR anyday, I like the way a rotor hits(especially a turbo one).