trd s/c tech question

[zoni]

does the s/c have a clutch or is it forced to be blowing at all times?

[shidarin]

I really believe SCs still have clutches, the SC will be blowing all the time, but so is a turbo. Thats what the blow off valve is for, to let off the excess air pressure

[zoni]

do you think im a noob? i know how turbos work and superchargers, just wondering specifically if our TRD superchargers have a clutch...

i was thinking of doing a twin charged 1mz combo. but i missed a sick ebay auction...
http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW
so i wont be doing that anymore... just straight up turbo.

[white90dx]

The TRD 1MZ supercharger has an internal bypass valve, not a clutch. The supercharger blades are spinning all the time, but they are just blowing air in a circle most of the time. (note the actuator on the top back of the supercharger - thats what it does)

-Charlie

[shidarin]

Thanks White!!

Zoni, I didn't know what you are. I certainly didn't mean any offense if you took any, sorry

(and it looks liek I was wrong

[Piddy]

Originally posted by Zoni_Camry
do you think im a noob? i know how turbos work and superchargers, just wondering specifically if our TRD superchargers have a clutch...

i was thinking of doing a twin charged 1mz combo. but i missed a sick ebay auction...
http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW
so i wont be doing that anymore... just straight up turbo.

Damn.... that was a good deal Too bad you missed out on that one.

[zoni]

no its not too bad... i need a supercharger with a clutch, or a centrifugal type s/c. if the TRD one had a clutch, i would be able to disengage the blades when the turbo spools so i wouldnt be abusing the s/c. i cant do that setup with the trd s/c. it would force the s/c to spin faster than the belt and cause damage.
-dave

[Phi]

yuppers, it's got an internal bypass valve.



Here's a pic of the actuator;

(copy and paste url)
http://image.pbase.com/u15/toycam/medium/11490377.1141427_IMG.jpg

[Phi]

Originally posted by Zoni_Camry
i cant do that setup with the trd s/c. it would force the s/c to spin faster than the belt and cause damage.
-dave

I heard that the twincharged MR6 ran into this very problem

[zoni]

yeah the bypass valve and actuator just basically lets off excess pressure like a turbo's blow off valve.

yeah phi, thats what i was thinking... cause you need to have some way to bypass the s/c's turbine so you dont over spin it. if our s/c was clutch type, we would be able to disengage the turbine when the turbo spools up, around 3000rpms or so, then the higher pressure of the turbo wouldnt try to spin the s/c pulley faster than the belt is going. and thats specifically what would happen in this case. the only other way to do this setup is with a s/c feeding into the throttle body but before that, there is a 3 way joint with a one way valve for the s/c charge pipe and the turbo charge pipe. so when the pressure is higher from the s/c the valve stays almost closed cause there is less pressure from the turbo, and then when the turbo spools up and gets to where there is more pressure, the air from the turbo charge pipe would blow through its one way valve, and the pressure would be held in by the s/c's one way valve... but this obviously isnt possible with a roots type in-manifold supercharger. this is why it might be slightly more possible with a centrifugal type s/c.

[/info]

for more great tech info, come to the shiftgate forums, no bullshit just tech.

[alltrac165]

Maybe I'm missing something, but that does not make any friggin sense at all. A roots blower is a positive displacement blower, which means it moves the same VOLUME of air with every revolution. It shouldn't make any difference whatsoever what the incoming pressure is, the outgoing pressure would be greater. I can't see for the life of me how you would overspin it. It's not like its a fan or something. Can you reference me to a tech article of some kind describing this phenomenon?

Wait, did they put the s/c first and then the turbo? That might cause a problem, because the s/c might not be able to feed enough air to the turbo. But if the turbo is first, then the s/c, it should work fine, I would think, because the s/c is just moving the same volume of air as before, but with greater initial pressure. The pressure ratio shouldn't change, because the engine displacement is still the same. Like how on sequential turbos the first one is bigger to feed the larger volume of air to the second smaller one which feeds the engine. But then again, I'm just theorizing here, so who knows. Somebody got links to info on that?

[88 LE]

Dude just do a turbo and forget the twincharging.

You always preach about turbos, so do it.

Or do 6 small turbos. 1 per cylinder, like that LS1 with 8 turbos.

http://www.lateral-g.net/sandlin

[thespud]

I get what your trying to do... use the s/c to spin the turbo up as well as feeding the engine, so the turbo has less initial spin-up time, then open the clutch on the s/c to reduce mechanical drag from the s/c am i right?

[zoni]

^right

88, thats pretty cool. you always come through with a cool link.

[Jzs147-RR]

Run a sc 14 off a previa and a turbo should spool dams fast and the sc's got an electroclutch..