eastrider250

i as thinking of buying a 1983 RX-7 in good shape with a 5-speed. I know they only have 100HP stock, and they're not very fast. I was wondering if I can make it faster (sub 7 scond 0-60, low 14's quarter) without major modification, no turbos etc.
If so how much wil it cost, the car is only $1200 but I dont want to spend lots of money, just a couple grand.

CORY CLAY

umm very doubtful that u will be able to hit your numbers.. and impossible without nos, or turbos. unless u find some really good deals and u can do your own work on the car... good luck..

CORY CLAY

i don't know what u need to do to get those numbers.. but first things would be to streetport your engine.or get a 13bt. i'm guessing it's a 12a since it is a 83... and then a carb ( webber or holly).. that would be the basics to getting those numbers.. streetport ( someone else doing the work) about 3,000.i think.. and holly carb about 500 used...but then again i don't know what i'm talking about so...lol and that's just one way you could start out.. i know alot of other people ( better able to anwser your questions).. but i don't think u can do it without major modication/money lol. that's just my thoughts.....
Cory

pratch

I think Yaw himself said that he could get 200 HP out of a stockport 12A, which would likely be within swinging distance of 14 and change if not lower.

Kill the emissions, lighten the car, get a good header and exhaust with a YAW carb and you'll be well on your way. With a big street port and the above you should hit it no problem (or have I erred?).

gamble302

rebuild and streetport your 12a, get carb and exhuast, and you should get where you want. stockport 12a with i/e can get into low 15's and streetport 12a with i/e should get you into low 14's.

gamble

pratch

Jeez, $3000 for a street port? What have you been smoking, Cory? Remind me to never have you give me estimates unless the insurance company is picking up the tab.

CORY CLAY

well i was looking be4 and i thought 450 for streetport.. but i thought u had to get it rebuild or should if your putting the money for a streetport? maybe i'm just total of base here.. my bad i'll just shut up next time

CORY CLAY

CORY CLAY

damn slow *** computer made me double post.. sorry again.. i'm just having a bad night

SilverRocket

Lol...

There absolutely *no way* that is going to happen with stock ports. You're thinking of another setup.

Eastrider,

Your goals are possible with a 12A engine, but I wouldn't say it's particularly "easy" (it's a totally relative term of course)... you'll need to have your engine completely disassembled and ported, and will need to rebuild, meaning replace seals, lap housings, etc. That equals a fair bit of money if someone else is doing it (as would be the case here I'm guessing.) You'll also need a decent induction setup (a good carb such as a Weber, Dellorto, Holley). You'll need to tune the former, which is a decent job in itself. You'll need a complete exhaust system, and an upgraded fuel setup.

Note that this stuff brings passing an emissions test over to the impossible side of things.

With all that, are you going to wanna be running an old worn out stock suspension? Lol.... not too likely. You'll need good tires as well (which are hard to get for the stock 13" rims...).

Now that you've reached the point of having a tuned, controllable car, you want to run low 14's.... you'll likely need to do some weight reduction. With these light, low torque cars, weight is KEY. It can make a big difference. You'll want to remove all unneccesary underhood and interior stuff, and forget about the sub boxes, etc.

Even then, low 14's is a pretty nice time.

Another consideration you might have is, if you're going to spend all this money and have your engine out for a while, why not just have a 4 port 13B motor rebuilt instead? You'll get *considerably* more power this way. Personally, that's the way I would go if I were going to have my engine out - the 12A wouldn't be going back in if it came out.

Anyways...

What I'm saying is, what you want is possible, and lots of people have done it, but it requires a fair amount of planning, work, tuning and downtime. It also might very well put you over your budget, if you want to have a well-sorted driveable car that's put together right.

I'd recommend doing some reading up before you make your decision!

pratch

I would've sworn that's what I had heard, but upon looking for the evidence, it has vanished. I imagine if presented with the bet, Yaw would find a way though

If he could find the time that is...

SilverRocket

Lol, it's just not even a matter of that. Stock ports don't flow enough for anything close to that power level, it doesn't matter how optimized the rest of the system is. The ports are the major limitation at that point, not the intake or exhaust.

purple82

Yaw told me that a goal of 160hp is "modest". Exhaust porting (no intake porting needed), header/exhaust, and a higher flow carb (stock, Yaw modified) is all that he said is needed. This also keeps the low RPM torque at stock levels since there isn't any intake porting. I would imagine this is more than enough to get a 2400 pound car to 60 in 7 seconds and through the quarter in 15.5. Add a light flywheel and maybe even a lower final drive ratio and I bet this could be a 6.5 second car.

SilverRocket

Definitely very modest, if you're porting. But for stock ports, I don't think you can count on much more than 150hp or so.

If all you want is a 15 second quartermile, no porting is needed - 15 flats are within range for a GS with the bolt-ons and some liveable weight reduction.

But what I'm getting down to is, is that if you're going to all the trouble anyways, why would you bother to keep the 12A (of course you need a new header, intake manifold, and a few other things, that's one argument), let alone port the frickin exhaust without doing the intake? It's not like porting the intake is tons more work than the exhaust, why wouldn't you do it once you've got the engine apart? I personally wouldn't go halfway, if I was bothering to have my engine all apart anyways.

If it's torque and streetability that you want, the 13B is the way to go. A nice streetported 4 port 13B with a sidedraft will make a solid 200+ hp without any trouble, and with more torque and a more streetable powerband than what you've got to do to a 12A to make the same number.