supercharging a 4ac (hypothetically)

[Wedged'86]

Hey,
if one was to supercharge a 4ac (hypothetically) would they need to use one of those suck thru carb deals or could they just blast that dirty, dirty Aisin carb with slightly compressed air from a ....ohhhh SC12 or something of the like?

Thanks.

[Screamn_Sleeka]

Cant use "suck thru" carbys, as the SC12 and SC14 cant have fuel run through them.
Yes, u will see on ebay "toyota super charger kit" and its a huge SU to SC14 to 202 manifold, but its not the proper way of doing it and it wont last.

There is SO much info on the toyota super chargers on this site and the net, do a search before you get flamed/neg rep'ed.

Boosting the stock carby wont work well either, if at all.

[oldcorollas]

either put injector bungs int he manifold... or use a 4AFE head

[Wedged'86]

Cant use "suck thru" carbys, as the SC12 and SC14 cant have fuel run through them.
Yes, u will see on ebay "toyota super charger kit" and its a huge SU to SC14 to 202 manifold, but its not the proper way of doing it and it wont last.

There is SO much info on the toyota super chargers on this site and the net, do a search before you get flamed/neg rep'ed.

Boosting the stock carby wont work well either, if at all.

nah nah nah, all i wanted to know was if the carb had to be changed, not info on toyota superchargers.

[Wedged'86]

ok might as well clear it up,
the reason i asked is i was offered a supercharger (either sc12 or 14) and was wondering how much effort it's be to use it on a 4ac (worth it or not)
and yes i know a 4ac plain sucks, which is why i'll soon have a 4ag.

[oldcorollas]

you could box the carb, or pressure proof it by changing/altering the float, and sealing the shafts etc....
similar as is done for webers one would assume..

[Wedged'86]

hmmmm, interesting.
yeah i can see myself doing that but all my good judgement is saying just to leave the 4ac and concentrate on the 4ag that'll be powering it soon.
i have these twin SU's which i could harvest but i know nothing about them and i was told they run off oil presure or some shit, dunno if that's true but as i said i know nothing about them.

[NeoNasty]

Been done before. I had a pic of one actually in an AE71.

Look under members rides for APJS Ae71. That was turbo, ghetto setup but it worked excellent! Might give you some ideas for forced induction.

[Wedged'86]

yeah i seen that guy, his car was in drift battle.
i loved that shit so much. it was so awesome
is that your car? and are you that guy?

but yeah he changed the carb though ey?
yeah i think that you'd have to do that to be safe..

[Screamn_Sleeka]

Ah k, that can work then.
If you can get a SC12 for under 200 or SC14 for under 300 you are doing well.

Randomly drill out the jets to a few more thou FTW!

[ViPeR_NiPPleX]

seal the carby up and run an extra injector triggered by a pressure switch. Crude but it would work. You would also want a boost referenced fuel pressure regulator. The yanks have done a fair bit of blow thru carby stuff...

[Hen]

I've seen a suck through setup using SC12 running on a Laser (squarish model) used for autocrossing. It turned up to events regularly so can't have been that unreliable. I spoke to the guy about it and he was saying something about just jetting an SU to suit and slapping it onto the intake of the SC.

Afraid I can't be much more help than that.

However both SC12s and 4ACs are cheap. It wont be great, but it could be fun and educational.

Hen

[Wedged'86]

slapping the carbie onto the INTAKE of the supercharger????

[MWP]

slapping the carbie onto the INTAKE of the supercharger????

Yup, draw-through. Its the easiest way to set it up.
You dont have to worry about sealing up the carb, fuel pressure problems, a BOV, etc as you do when running blow-through.

Someone here in the forums mentioned that fuel kills the super-charger, but didnt give any details, so it might be a myth (anyone have 1st hand proof of this?).
The only thing i can think of that would fail in the SC from fuel is the teflon seal on the rotors.... but teflon is fuel resistant, so i dunno?

[doityourself]

The SC 12 and SC 14 superchargers have teflon coated rotors, helps keep the temp down on the internals of the charger because of there very fine clearences.
Apparently over 1000 s of Km's the fuel will cause the teflon to come off the rotors and heat will build up in the SC and eventually it will cease.

You could try and find a twin sidedraught or twin SU manifold for the 4A (if one exists) and run blow through. I have heard good reports from many people that SU's are good with blow through applications