so i have the 51 running well but having a few issues with the idle mixture i can't get my head around, it had 65F11's in it and ran like poo well rich, so as i didnt have any others at the time i put the idle jets from my 45dcoe in there 60F10's it ran a load better although the idle jet hold is smaller in length, i swap the idle jets into the ida (120) holders and again ran like ****? i have a cheap air fuel gauge (not a wideband) and i was still all the way round on rich so i ordered some 60F9's same thing it will only run on the DCOE holders? still right round on the gauge and my eyes are stinging! lol the idle screws come out 1 - 1.1/2 turns so thats all good and the car runs sweet enough, is it just a crap gauge or should i go smaller on the idle jet?
the carb also has the 3rd progressive hole and the change over seems fine

running 195 mains and 160 airs 40 chokes F11 tubes and that seems good its just the idle mixture
motor is a 13b 4port street port
thanks

 

correction the 51ida came with 65 f10's the 65 f11's came out the 45 dcoe
i have just ordered some 55 f10's (proper 48ida idle jets) and will use the 120 idle jet holders and see how that goes

 

You can only use F-10 idle jets with an IDA carb. they do not have an air bleed drilled in the side of the jet. The airbleed for an ida is the holder. Run 60f10 idle jets with 120a/c. anything else I've tried hasn't worked out well. Being a street port anything leaner on the idle circut will not work well. I sugegest you trash the f-11 etubes pick up some f-8's or f-3's, and read this thread.
https://www.rx7club.com/1st-generation-specific-1979-1985-18/weber-emulsion-tubes-805950/

then search "IDA jetting" there are plenty of threads to help you out.

 

thanks when you say 120 a/c you mean air in the main? or the idle jet holder?
been reading through the thread interesting stuff, will let you know how it goes
thanks
Mark

 

what type of motor are you running? stock, streetport, bridgeport......? I think the chokes are on the small size. Have to go to work. I'm going to check up on this thread later.

 

in my sig a 13b 4 port street port

 

had another look tonight and took the car for a run, got back put the 48ida 120 holders in with the 65f10's would run if i wound the idle screws out but the gauage was reading normal to lean? so i put some 70F10's in i counted 4 turns out before it would run at all left it a while then it started going lean again, do you think it could be float height? the smaller holders from the 45dcoe seem to work fine the longer 48ida one's don't

 

after having another read over your thread i think i'm seeing the same issue you had wih the 3rd progressive hole, with 70F10 idles i have to turn the mixtures screws right out to get it to run anywhere near right, i'm gonna plug them and see if that solves it
Mark

 

yea. they might be too big or not quite in the right positions. Remember with the IDA you have to use the IDA idle jet and jet holders. I got the best results with 120 holders and 65f10 jets. you could try 120 with 70f10 jets but it will be pretty rich at the transition. remember the f-11 is a very very lean e-tube at the transition, so if your float is set just .1mm to low it's going to **** things up. I've heard for every 1mm lower you set the float level the main circut will come on 1000 RPM later. get rid of the f-11 e-tubes and i bet most your issues go away. I spend over $100 in jets and months tuning and couldn't get the car to drive perfect with the f-11's. Once I got rid of themn I got rid of my issues. Try f-3's or f-8's. I love the f-3's. They're just like the f-11's up high but give you way imporved throttle response and mid range driving with the smaller diameter allowing the main circut to start way earlier.

 

will try the F3's but really need to sort the idle out first, like i say gonna plug the 3rd hole and start again with just the 2
where did you re drill you .8 holes?
thanks
Mark

 

directly above the bottom hole and at the very top.
Just as shown here: http://www.aircooled.net/gnrlsite/re...idarebuild.htm