von

This is what someone told me earlier. I need help actually doing this what wires to cut exc, if anyones ever done it.

What he did, was just snip all the wires for the fuel injection, and leave the computer to run the ignition, he kept the stock coils and crank angle sensor. What I'm gonna do though, is find a distributor from an early 13b. This was I will be able to get rid of the computer all together. His runs fine the way it is though. I would assume that his check engine light would always be on though :-P

Randy

Node

iTrader: (1)

i know someone who's carbed his GXL, but it blew up a lil bit after and now is getting a v8. dunno if its because of the carb. But I don't know why it blew, so don't blame the carbureting, N/A 13B's can run extremely lean, and even knock and not have problems like boosted rotaries do at leaning out.
anyways
www.racingbeat.com sells a lot of intake manifolds for carbureted rotaries

Aaron Cake

iTrader: (1)

So, you're trying to downgrade your car? Or are you racing in a class that does not allow EFI? What kind of porting have you done?

von

Downgrade my car? Have you seen the carbs desine? Its a streight shot of air into the block with no maf sensor or twisty curves (6feet worth)...How can you say it degrades my car ? Show me some proof. Its not my daily driver and I dont road course. I drag race on the weekends at our local drags.

I have a streetport thats so big its bigger than a 4port J-bridge in volume and port timing.

Aaron Cake

iTrader: (1)

OK, so it's a drag car...So drivability, efficiency, fuel milage, tunability, reliability, etc. are not a concern. The idea here is low cost? The carb might fit the bill if you can find the carb, manifold, fuel pump and accessories used...HOWEVER, you will definitly want to keep the stock ECU to run the ignition. It will do a better job then a distributer ever will do, and you can retard or advance by moving the CAS.

A few topics that discuss the advantages/disadvantages of carb setups:

https://www.rx7club.com/forum/showth...highlight=carb
https://www.rx7club.com/forum/showth...highlight=carb <---Good one
https://www.rx7club.com/forum/showth...highlight=carb
https://www.rx7club.com/forum/showth...highlight=carb
https://www.rx7club.com/forum/showth...highlight=carb
https://www.rx7club.com/forum/showth...highlight=carb

Now, a number of those topics focus on road cars, but the points remain the same: EFI is vastly superior to carbs under all circumstances.

NZConvertible

A carb works by choking the air! Without putting a significant restriction into the airflow (the venturis), a carb won't work. And even a decent carb system needs some form of ducting to the carb, otherwise you're sucking hot engine bay air and throwing away potential power. On top of Aaron's links, name one performance car that you can still buy with a carb...
Ah, that's different. If peak power is all you're after, then carbs are an economical solution. But there isn't a carb out there that can beat an aftermarket throttle body injection system, if you can afford it. That's not possible. Any streetport design can be made bigger by enlarging it out to the edge of the housing to make a bridgeport, and made bigger again by cutting into the housing to make a J-port.

Keep the ECU-controlled ignition. Unless you can get the distributor recurved specifically for your engine ($$$), it won't perform as well.

KNONFS

iTrader: (14)

I beg to differ, and I have the proof at home. www.dragsport.com Latest mag out there, has a tech issue (by some guy who works @ racing beat), he tuned 3 setups:

-Holley carb
-Webber
-EFI webber style

The old school webber had the BEST powerband between all three.........

The reality is that CARB does work on the rotary engine, true a EFI system will be the best of both worlds if fuel economy, and extracting the very las HP is a issue.

NOPSTN4EVER

I carbed my fc last year. Buy a wiring diagram from Mazda, the wiring on these cars is fuct.
good luck on your conversion

von

About the streetport. Actually im using the 6port housings in wich I was able to take more off without a bridge to make up for a 4 port with a bridge. The reason is the single hole for the 4port has more casting than compared to the 6port but the 6port is just bigger because thiers 2 holes wich already expand wider than the 4port single hole...I made those holes into one large one and streetported it beyond recomendation!!!

Well if more poeple will tell me how thier carb setup is working then that would be good i guess.

Still dont like the N/A manifolds even though mine is ported its just way to turbulancy looking and the size of that maf sensor probly even restrics a stock 7...

Im looking for the most revs! so if your saying that I cant rev as high as a stock TB using a carb let me know and I guess I scrap that project. And I was planning on using the stock ignition anyways but thnx.

KNONFS

iTrader: (14)

The Dyno charts (on the above mag) show a LINEAR power up to 8500 rpms, no dips, no nothing!!

There is a guy here (maybe he used to visit) who races in SCCA with a webber setup. He went (temp) from EFI to Webber; I also bellieve he was using the stock ignition setup........

I'll see if I can find the thread!

von

cool but i would have to subscribe to get the full article and information your talking about.