erv187

so in a few months, i'm looking around for an fb rx7 i kinda want the 84-85 version cause its already fuel injected and a 13b. if for some reason i get a 12a rx7, i know theres camden that makes superchargers for them. but how would you go about turbo-ing one? would you have to convert it into fuel injection or what? i'm completely lost. a friend of mine told me his friend turboed a carburated mustang 351 with a t66, but didnt make sense to me cause how would he regulate the air/fuel?
so yea could anyone tell me how I could turbo a 12a?
or is there a post i missed, cause i couldnt find any?

TheRX7Project

iTrader: (3)

I know everyone does blow-through, but I am a huge believer in draw-through. I mean a carburator was designed to get sucked through.

However if you do decide to go blow-thorugh, there are carbs designed for that, and you just have to use a boost-indexed fuel pressure regulator.

Jeezus

iTrader: (4)

Carbs are designed to have air go through them. Doesn't matter which way

yetterben

*sigh* i wonder if this has been asked before! Thats funny you could not find any cause i can think of 5 off the top of my head!

pinoyremix

yep..yetter is right..look right below there are 5 links..that are related...this question gets asked at least once a week

bad 83

iTrader: (3)

So all you need is a boost-indexed fuel pressure regulater? That almost sounds too easy .

erv187

my bad, i'll do some research

yetterben

lol way to own sam. i wish i had a 12a turbo lol

bad 83

iTrader: (3)

Dude....Seriously, we're just giving you a hard time. But this is an everyday subject. There is no buy it now bolt in kit. There are a few people who have got stuff together to to make the switch less painfull, but still alot of fab work is involved. If you are looking to make the leap into turboing a 12A, PLEASE do your homework. I have seen so many times people who "start" on it, but never finish.

zane9000

I have sort of a related question... Why even bother turboing a 12a? is it just to save money on an engine swap? I would think the first thing people would do is ditch the 12a for a 13b to get more power then get an appropriate sized turbo for that if they still feel the need for more power. Sorry if this is a dumb question, I just really dont understand why you would have a small motor at the heart of your build when a very similar motor, just bigger, is availible...

bad 83

iTrader: (3)

Go find a TII drivetrain and electronics. Do the swap, and I will still walk you. I have pulled on TIIs running 10psi all day long. I have about a grand in my setup. I don't think you could get lucky enough to find a running TII and do the swap for less than 2 grand. If you think a 13B is alot bigger than 12A, then 10mm is more than I thought................

FirebirdSlayer666

iTrader: (3)

^^^^As Robert has shown us, the 12A can make just as much power as the 13B can, plus it's more fun making power out of the underdog.

yetterben

i too will annihilate a t2 at 10lbs!

zane9000

Well I was not talking about just doing a stock TII swap, I was talking about staring with a 13B so you have a higher displacement at the core of your project. 1.1L vs 1.3L seems like it would be a worthwhile upgrade. You wouldn't have to necessarily keep the stock electronics either, you could just swap on a decent carb and get a blow through setup going.
I dont know though, I am pretty new to all this and am coming from Datsun Z land where if you had a 240z and wanted to build up your car you would start by swapping your 2.4L for a 2.8L before even thinking about what your turbo/supercharger options were. I would think that the 0.2L displacement would be a big enough difference on a rotary that it would be worth it, but maybe not.

FirebirdSlayer666

iTrader: (3)

You have to think though, that's only .2 liters, 10 cubic inches, 162 cubic centimeters, it's not a huge difference. Plus the 13B's are heavier due to the larger size. Depending on what your goals are and what exactly you want to do it may make sense to use the 13B just for the fact that the aftermarket is there for it and there are a ton more options for it

zane9000

.2L may not sound like a lot, but it still is about an 18% increase in displacement, any idea how much weight difference there is between the two motors? I am not trying to be argumentative or anything, just trying to get a good understanding about why people do things the way they do. I am planing on building mine up once I get all the basics done and just want to consider the pros and cons of all my choices.

Thanks for the feedback so far

yetterben

use the search button and someone lock this thread!