hi guys, ive asked questions on here about using a idf carb etc yesterday i got a s4 13b n/a rx7 compete. so my plan is to remove all the injecton gear and fit to my 12a 6port bp. by fiting injectors into my 12a manifold about were they are on a 13b and mod my carb base to take throttle body etc. how well (or tuneable is std 13b computer?)how do you think a std set up would go on a 12a bridgeport. also what are bridgeports like at idle etc when injected?
any insite would be nice before i start cutting things up to test my thoughts.
useing the coil packs and crank angle sencer and fuel pump etc etc all needed parts from s4 will be swaped. and still useing my factoy loom for my lights and other stuff in my s1 rx7 just laying injection loom over top and feeding it power..
ps im not stupid just asking if anyone tryed this or any traps i may find to speed up my trial and error... thanks

 

while i commend you for injecting a bridgeport 12A (and a 6 port at that), i must say, they don't work all that well with the 13Bs stock manifold and ECU, so i doubt it will work well on your 12A. just get a manifold made and run an aftermarket EMS.

 

Here is one i did recently using a 12A turbo manifold and custom injector bungs with a T-72mm turbo......car is set at 15 psi and making 300rwhp on aftermarket ECU.

 

ill will use my 12a manifold and mod to fit 13b injectors into it. i could just use a aftermarket set up but im trying to stay cheap....

 

Is that a carb hat on a carb style throttle body be chance??

 

I wouldn't bother with the factory ECU on anything but a car that remains stock.

Aftermarket computer is really the FIRST thing that should be done. IMO.

 

I couldn't agree more. If you dont do your injection properly with the bridgeport your probably going to cause yourself a lot of trouble not to mention you wont reap the benefits of the new ports anyways. Either get a standalone management system or look into getting a decent carb. No offense but the moment you went for a bridgeport, cheap sort of went out the window

 

yea cheap went out window that is true..... costs keep climbing

 

whats the best carb set up then? does idf carbs work on a rotary eg one 44mm idf (not ida)

 

Best setup would probably be a 48 or 51 IDA Weber. Im not a carb guy myself so im not sure about the IDF but 44mm does sound a little small.

 

I don't think anyone makes an IDF manifold anyway.

44mm is definitely too small. Two of them might work out okay.

 

if you only plan to run one carburetor, don't even look at anything less than a 48 mm. period. as peejay said, you can probably run twins if you simply have to get 44s.

 

i was pondering this very problem.


im going to go the fuel injection rout on my 79sa. ill ditch all the bullshit and run a cas, with a manifold adapter plate to run a 13bt manifold with 800cc injectors ( just two of them since the bungs dont exist on the 12a) and just run a surge tank coupled with an inline fuel pump all powered by a megasquirt.

 

Sounds like I'm jumping into quite the project by fuel injecting my 12a but that's ok lol. Can you suggest the best porting method for EFI I'm a noob when it comes to rotories thats forsure

 

Im gonna have to intervene lol I am running a SA nikki with my bridge, and just slapped out 162 whp. the engine WILL make more power with a side draft or holley, but this car drives like a stock port, minus the BRAP. lol If you looking for the perfect jetting, leave your primaries alone and swap the secondaries out for .200 holley jets. thats my setup, and she stays in the low 12 AFR's all the way to 9,000 Rpms. I never turn it over that, I really dont see the need for a street application. As far as injection, I have ran a s4 intake setup with a bridge port and factory computer. I just ran 680cc injectors in the secondary's. It ran beautifully no issues. If your building a engine, use a GSL-SE center iron and bolt on a s4 intake, thats it!! easy as pie, if not get the lower intake from racing beat that adaptsa 12a to a s4 t2 upper. plentyof options, its just up to you wallet. But im just an old NIKKI kinda guy