turbo 4ac

[delta s4]

G'day,
Just wondering, those who have played with blowthrough/suckthrough turbo systemes on the 4-ac, what sort of power figures did it slog out?and on how much boost?.cheers

[andro0o]

lol its such a waste of time.

though didnt lawsons car make like 100kw or something i read in drift battle?

[tricky_dan]

how come such headaches? are carbys engines a bitch to turbo?

how much would it cost to turbo a 4ac do u reckon? more than a gze? or just cause parts are harder to get?

[Konakid]

mmm it was fun while it lasted

blazed 4th gear

it was apparently faster than the 'fastest' ae86 drifter OMG OMG OMG

[delta s4]

They are headachs coz without correct understanding of how carbs work in relation to forced induction, big problems can occour with correct fuel dilivery.

Suck through systems (carb mounted on intake of compressor) can be more convenient to set up but are difficult to tune coz of the excess ammount of air being drawn through the carb.The excess amount of air and atomizing fuel can also cause the throttle to freeze wide open on cold days. Atomizing fuel can also damage compresor impellor blades of the turbo after a while, plus you can't use an intercooler as you would have a massive charge of combustion gas ready to explode if a backfire or some shit occoured.

Blow through systems (carb mounted after compressor outlet) can use intercoolers as the air dosn't mix with fuel until it reaches the inlet manifold where the carb would be traditionally mounted. Apparently these setups work alot better than the `suck through system' however more preperation is needed for the fuel system and carby to work properly, otherwise the pressurised air will force the fuel back through the carb and into the fuel tank. There is generally alot more labor involved, but the end result allows finer tuning and a more reliable car.
All that jibba jabba is just some of the pros and cons of both systems.

Parts are fairly easy to get, but its knowing what parts, and what to do with them. If you knew alot about carbs/forced induction and mechanics in general, were handy with the the spanners, had acess to a welder, you could probly dodge up a pretty good system for not to much.
If you wan't big results and reliability then pay the cash and get a 4age, which oneday you might turbo or whatever. But if you wan't to challange yourself for a fairly small amount of power (compared to 4age) then turbo your 4ac.


catchya

[Driftspec]

^^^ And remember that the standard 4A parts aren't designed for boost, although Dave did well with his 4AC'T Needless to say, its just like pumping boost through a standard 4AGE - it can be done, just don't expect your parts to have optimal life expectancies.

There are so many different options to turbo'ing a 4AC, the only reason I would do it would be to destroy it

[gg004]

i saw a 4ac with gze supercharge and su carby on it iin ae71 once,

[tricky_dan]

ah cool! thanks so much delta for explaining!


haha i didnt think of the fact of turboing a 4ac on stock internals... could be the killage... haha