4agze super-charger switch?!

[mrlucky999]

Lookin for a ae90 series 4agze rolla at the moment and have come across a few with super-chargers switches. One guy said it was because the 4agze super-chargers have an electronic clutchs in them. U guys got any ideas on how its done, or how reliable or safe it is for the super-charger.

[roadsailing]

the 4AGZE ECU has a supercharger switch in it, it knows better than you when to turn it on and off.

[Jorrs]

this is something new to me as well, about SC switches, is the ZE unique in this switch or is it common ?

[mrlucky999]

i've seen it in 2 now and i've been lookin round for 2 weeks

[-GT-]

The most reliable solution is to let the ecu switch it, rather than driving round with it on all the time.

Yes the superchargers have electronic clutches, and it'd be done by re-wiring the signal wire through an in-cabin switch. If you just wanted to be able to switch it off so it doesn't come on without you wanting it to you'd just put the switch in line, but if you wanted to be able to switch it so it stayed on you'd need to take the ecu out of the circuit.

[fixeruperer]

you need a switch that turns on at 10" vacuum and activates over 2000 rpm

[011]

I've seen it done, for people who want to be able to turn it off completely. I suppose you'd just put a switch or a relay in the circuit between the ECU and the supercharger clutch, and also maybe between the fuel pressure switch and the fuel pressure reg so it doesn't run rich when otherwise the SC would be engaged.

Does this sound right, 4AGZE boffins? I'm thinking of doing it to mine somewhere down the track.

[-GT-]

If you just want to be able to switch it off so it doesn't come on when the ecu tries to switch it on all you need is a switch in line in the signal wire.

[feral4mr2]

wiring a mad max switch into the s/c is a since, but a waste of time. the car drives slower than a bad running 4age and IMO doesnt help bugger all with the fuel economy.
yes i have personaly done this.

[mrlucky999]

wiring a mad max switch into the s/c is a since, but a waste of time. the car drives slower than a bad running 4age and IMO doesnt help bugger all with the fuel economy.
yes i have personaly done this.

yeap what i thought. what do u reckon it would do for economy?

[Jorrs]

excuse me if im wrong, i have never owned a ZE powered toyota, but by simply switching of the SC, wouldnt this create a massive restriction for the motor, ie having the air still passing through the SC into the motor but not having it active ?
maybe this is why they run so poor without the SC switched on,
and to be perfectly honest, a ZE couldnt use that much fuel running the SC why would you personally bother to switch it of ?

[011]

Fuel economy comes down to driving style and includes many different tricks. It's actually a skill to be able to drive your car in an economic fashion.

By disconnecting the 'charger, you'd be hoping to benefit from economising during acceleration. To get the most economy from your car whilst under acceleration, you need to accelerate in a fashion that keeps the car running as lean as possible. Basically, this means accelerating slooooowly, with minimal accelerator pedal input.

The 'charger doesn't engage unless you're up it anyway. If the car is under load - which would mean the fuel mixture is on the rich side - it would probably be more beneficial economy wise for the 'charger to kick in and provide boost, helping volumetric efficiency, and you might even be able to run a little leaner than if you were off-boost, as the 'charger helps the engine to pull, rather than struggle.

[011]

Jorrs, remember that the 'charger is clutched and only comes on when the ECU senses load. When not engaged, air is directed around it via the ABV and the car is effectively NA.

[Jorrs]

ahhh true, sorry im not very familiar with SCs..
what block do the ZE 4ag use ? as feral said they perform poorly when the SC is switched of, are they are bigport block ?

[feral4mr2]

air still comes through the s/c into the engine when the clutch is not engaged the s/c free spins. the ABV does not supply enough air through it to feed the engine.

charger is clutched and only comes on when the ECU senses load

it is engaged when the ecu senses ~8" of vacum.

what do u reckon it would do for economy?

though some people say it made their fuel economy slightly better, i saw no better fuel economy to justify the painful slowness of the car when the s/c is switched off.