thelittlefatmailman

Hey guys, im still really new to rotory's nn stuff, and i just got a 1985 gsl with a non ported 12a with only 13 thousand miles, and I am wanting to put a new carb on it, but I have been wanting to know for a while now, what the best carb would be for my car, im not gonna get it ported in the future, and im getting a whole new Exhaust System from racing beat [ prolly the high performance street port Exhaust System ] so i was just basicly wanting to know what carb to get, and how much hp im lookin at after its all hoocked up nn everything.

nick812

To many different carb setup out there i have had a stock Nikkie and dellorto and now a Mikuni 44PHH. Of the ones i have liked the Dellorto best. I have heard great things about the Weber and holley also. Just do some price shoping and see what every1 elese is running. If you can try to find some1 Running a carb you might like a see if they will let you take a ride. Good luck.

Latin270

Yea I too loved my Dellorto, but the lack of parts made me stick with Weber carbs!

Kentetsu

No experience with anything but the Nikki carbs (stock and modded). But I am extremely happy with my Sterling carb. I could go on and on about all the wonderful aspects of owning one of these babies, but instead I'm going to make some coffee now....

thelittlefatmailman

thanks for the input guys!

I think that the main ones that im thinkin about getting would ither be the holly or the webber, by any chance do u guys know about the average hp gain i would be getting with propper tuning [ rwhp ] or just like base hp....lol...ither one

thanks

BigJeff

I don't actually have a modified nikki from Sterling or Yaw, but from all the research I've done that seems to be the way to go for anything less than a full bridgeport. Reason being, a modified nikki can fill the air/fuel requirements for a street port, but the smaller venturies provide more air velocity which can actually end up getting more air mix into the combustion chamber.

Anything past a big streetport and the consensus is the nikki's are inadiquate and you should go for a holly or weber or something that has a 450+ cfm airflow.

I'm getting a good sized streetport and a half bridge on mine, and I'm going with the modded nikki; though I did find a racing beat tuned 650cfm 4 barrel holly on ebay for a good price that I'm gonna keep in reserve, just in case.

trochoid

iTrader: (6)

Best bang for the buck, go Sterling. I'm running a Mikuni on my 1/2 bp, would like to try a Sterling for it or one when I get around to putting the other GSL back together.

BigJeff

Oh yeah, and from what I can find, the gain can vary a ton just by small tuning adjustments. I don't know of any streetport figures, but the average estimate I've seen thrown around here for a stock 12a and a free exhaust with a modified and tuned nikki carb is around 40hp over stock.

My local rx7 guru estimated my streetport/half bridge setup that we plan on doing to hit 230-250 hp if everything is tuned just so.

Just bear in mind, tuning is huge, so is proper port shape, so his your exhaust setup, etc. They all can add up to big gains or losses. I was reading Yaw's page and he was talking about a time he was tuning a carb, and as little as 2 or 3 tenths of a lb of fuel pressure made a difference of around 10-15 hp. Proper tuning is key. Tunable carbs make that possible, so whatever you do make sure your carb has pleanty of options for future tuning.

thelittlefatmailman

thanks again guys, that info really helps me out.

I know that I don't have the money to port or anything like that.....so i think ill just be getting an aftermarket carb.

wich one would be the best choice????

BigJeff

Oh hey, I read your post wrong, I thought you said it was gonna have a streetport. If it's staying stock then go modified nikki (sterling or yaw, not sure you can get yaws any more). All a big carb on a stock engine will do is give a little better power and a lot less driveability. With a modded nikki on a stock 12a up to 150hp is possible from what people are saying, and I haven't seen similar numbers with a holly or webber or anything on a stock 12a.

That said, I haven't done -anything- like this to my car yet, I'm just going by what I've found doing research on several sites (and a couple books).

For another source, "Vizard the Wizard", considered by some to be the best carb tuner anywhere for anything, who has been doing custom carbs and carb setups for race applications and street for something like 30 years, said in this book about carbs I'm reading, that for maximum effect you want smallest venturi size you can possibly get and still meet the air flow needs of your engine.

Well, the nikki's have more than enough airflow for a stock 12a, and they have the smallest venturi's of all the carbs I believe. So, get a nikki tuned by sterling and you'll only need minor adjustments to hit the full potential of a stock 12a.

thelittlefatmailman

sweet man, thats some awsome info, lol, but the only problem is, who is this sterling peson that your talking about???

trochoid

iTrader: (6)

I'm an hour north of you in St Joe. PM me with your number and you can bring your car up. We can talk at length then on your goals and what you want to do with the car. I can also go over the car with you and let you know what it needs before making the go fast mods.

Kentetsu

Sterling = www.sterlingmetalworks.com But I think the site is down for updating so check with http://www.pbandjracing.com/

thelittlefatmailman

sweet, thanks man.

thelittlefatmailman

oh man, thats awsome, the only thing though, is that, right now i don't have an exhaust system, and the car isn't licenced, and I can't get an exhaust system at the moment because I don't have any cash.

I still have my old exhaust system that I took off of my car, I do need alot of help on it, becuase the whole pipe setup is so wierd that I don't know if I should go save for a whole new system from racing beat, or if there is some way I could save money and some how still use my old one, or parts from my old one or something like that.

oh yeah the reason for takin it off would prolly help alot also, I took it off because the catalytic converters are all clogged up to a point to were there not usable at all, and I would have just replaced each converter or what not, but its all messed up, like the catalytic converters are welded onto the pipe and everything, like....the bolts on the flange have weld on em.....and its all messed up.

what I could do is get some pics tomarow after I get off of work, and pm them to you or somethin.

thanks for the awsome help