3SGTE Twin Charged

[CHB]

any body done or saw any one done a 3T-C twin charged? i'm now planning to built one for street/strip 3T-C that boosting 30psi. initially all the part has to be available at local junk yard or easily available. a SC14 from 1GGZE should be enough to push 14psi at low RPM and a turbo will do the rest of the job till 30psi @ 8000RPM redline?

[CHB]

sorry i mistype the topic, it should not be a 3SGTE but comments are welcome...

[SillyCarS]

are you commited commited to spending a min of $10,000?

[CHB]

i'm pretty half way there as my TE70 already a street driven 3T-C EFI turbo megasquirt2 and turbo cam, performance dual valve springs etc etc. just lack of a supercharger and some fabrications thats all. here is my engine shot

[SillyCarS]

sorry i miss read that, i thought you meant 3sgte

there a couple of guys on here with twin charge experience so youve come to the right place

you'll need pulleys and brackets obviously for the supercharger, i think the most complex part of it is the cooler plumbing and ecu tuning

good luck it should be fun when its finished, props to you for going megasquirt too!

[fixeruperer]

its change over from s/c to turbo thats the hard part.

[stradlater]

Just get a bigger engine mate, that'll fix it. ;-)

no need for a scooopacharga then.

[feral4mr2]

its change over from s/c to turbo thats the hard part.

there's no need to 'change over', you can run the turbo straight through the s/c with no bypass valves etc. with no ill effect to the s/c.

[oldcorollas]

there's no need to 'change over', you can run the turbo straight through the s/c with no bypass valves etc. with no ill effect to the s/c.

that seems to be the easiest and most reliable option..

but you may need to upsize the exhaust housing, for the increased flow, and change compressor housing/trim, so that it can flow large volume at low pressure..

if you run SC at belt speed to give say.. 10psi (with no turbo),
then the turbo only need to provide 11 or 12psi.. to get your 30psi in the manifold..
but still needs to provide that flow from compressor and exhaust housings efficiently.

edit: got fuel that will let engine survive at 30psi?

[fixeruperer]

yeh as oc said, not having a change over is the easiest way but i dont think you would reach its tru potential having it twincharged.

[CHB]

i was thinking to use a "one way valve" to do the bypass. its completely mechanical and controlled by spring pressure only. if turbo's pipe have more boost than the SC pipe, it directly switch over to run the turbo pipe.
or another way, control the SC using spare output from my MS2 may works too.
btw, there is no harm to stick with the topic of "3SGTE" as i will consider my next engine swap.

[brett_celicacoupe]

if you used a one-way valve in parallel with the supercharger then i expect it would never actually 'open' to bypass air.

to open it would need a pressure differential where the turbo is making more pressure than the outlet of the blower. if you use a positive displacement blower then the pressure at the outlet is ALWAYS going to be higher than that at the inlet (unless the SC displaces less than engine per revolution).

the easiest method is; air filter -> turbo -> intercooler -> throttle body -> supercharger -> engine

[CHB]

i agreed with the point where one way valve is parallel with SC. how about add another one way valve at the supercharger inlet so that once turbo kicks in at higher RPM, the one way valve at supercharger will be closed and the one parallel with supercharger opens to allow the turbo boos get thru and goes to intercooler?

the easiest method is; air filter -> turbo -> intercooler -> throttle body -> supercharger -> engine

if doing this way, we need to make sure there is some charged air cooling method after the supercharger.

[oldcorollas]

if anything, you need to throttle the SC to produce no flow at the changeover point.

SC flows fixed volume. when you turn it off, you lose that volume.
if that volume is makign the turbo spin, then turbo will kinda.. stop spinning, when the SC's volume of air is turned off.

so you need to reduce the SC flow gradually...

[feral4mr2]

the easiest method is; air filter -> turbo -> intercooler -> throttle body -> supercharger -> engine

i ran mine : air filter -> turbo -> throttle body -> supercharger -> intercooler -> engine. but then i started with a 4agze so plumbing was easy.