Bearzah

iTrader: (6)

Hey guys.... I'm setting up a blowthrough Weber IDA 48 on my 13bt t2 engine swap into my 1st gen. I'm targeting about 10psi with a s5 turbo and wanted suggestions where to start my carb setup (IE, jets, e-tube, vent size, etc). All the setup info I've found so far doesn't pertain to boosted applications. Does anyone have any experience they can share?
Thanks,
-Chris

PS... I'm also having trouble sourcing a used IDA... anyone selling? Buying new is still an option, but, a painfully expensive one.

j9fd3s

iTrader: (3)

didn't we just have this thread last week? short reply is, you need to go thru each part of the carb working from idle on up to figure it out.

the easy parts, you want 42-43mm venturi's. emulsion tube should be i think an F8 or an F7, or maybe richer.

idle jet should be in the 60-65-70 range.

to suggest more jets really depend on the engine/intake/exhaust setup, how much boost, and what afr you think you can run, along with the fuel pressure and float level.

Bearzah

iTrader: (6)

true... we did... we just never touched on venturi's really (correction.. I see you mentioned venturis.. my bad)

So i'll need...
- 3.0 needle and seat
- pretty much stock idle setup (70 idle, 120 idle holder)
- 42-43mm venturi's
- f7 e-tube
- 170 air
- 175-200 main
- solid float
- carb hat

If I used 37mm venturis would it not work? How would that affect jetting and overall driveability?

j9fd3s

iTrader: (3)

37mm venturies would work, on an NA car smaller venturies would limit power up top, its a smaller hole, and in exchange you'd get better low end power. i started with 43's and i see no reason to swap em out, even though i do have some smaller ones.

they might work on a turbo car though, as you have the turbo.

i wouldn't hang my hat on a 170 air either, its a little more complex than this, but the main fuel jet controls the AMOUNT of fuel, the air controls WHEN it arrives.

Bearzah

iTrader: (6)

How about:
Venturi- size..... 36 or 38 mm
Fuel Jet- # .......180
air jet- #.............160
Emulsion tube.......F11 or F16
needle Valve- #...........300

j9fd3s

iTrader: (3)

i wouldn't run an F11 on a rotary at all, F16 is also really lean. everything else is speculation....

rx71king

iTrader: (6)

this thread is not about turbo . but it helped me out alot on my turbo setup..https://www.rx7club.com/1st-generation-specific-1979-1985-18/weber-emulsion-tubes-805950/ ..Hyper4mance2k you are the man thank you..

j9fd3s

iTrader: (3)

he is!

Bearzah

iTrader: (6)

Yup... I've read the thread.

Guess I'm thinking something like this now...
Venturi- size..... 36 or 38 mm
Fuel Jet- # .......180
air jet- #.............160
Emulsion tube.......F7
needle Valve- #...........300

rx71king

iTrader: (6)

sound like a good start.....i would go richer..like a 240 jet to start with

PercentSevenC

Yeah, you're going to need bigger main jets. At 10 PSI with no intercooler and a smaller carb, 205s are already a bit on the lean side for me.

Coryharris

I'm looking at a similar set up but a 51 ida was thinking 46 venturi n running 8-10psi from a gt4508r turbo who much fuel pressure ect will I need any help would be awesome