49 replies to this topic

[D-Train]

Has anybody on here tried twin charging their red six before? It has always interested me engineering wise and would love any info or ideas that people have.

[rexy]

A few have done it.
 image.jpg   149.92K   3 downloads
 image.jpg   75.05K   1 downloads

But why stop at two?
 image.jpg   51.42K   3 downloads

[Uncle Chop Chop]

Rexy, that first image looks like a pair of Toyota SC14's. I wouldn't think two would be enough for a mild VN V6.

[UCgazman]

One sc14 on a 3.8 v6 gives a moderate boost, two would be a lot of fun! that green one is a Gemini too so I'd say its pretty quick. I've considered doing the same thing to a few previous conversions because sc14's are cheap as, and easy to setup...

[Uncle Chop Chop]

I was told an SC14 is only good for 5 PSI boost on a 202.

[WhaleOilBeefHooked]

I agree with Peter, and would think twin hairdryers the better setup, esp. the third picture where that germ-in-my-eye is powering 3 puffers... More wow than pow factor......

[orangeLJ]

There is also the sc + turbo twinchwrging


Sc for low revs and allows for yhe use of a larger turbo (no down low lag)

[UCgazman]

I was told an SC14 is only good for 5 PSI boost on a 202.

 

There abouts, you dont need as much boost from a supercharger to make good power as the boost is instant ie. no lag (+ you can run with a higher c/r). If you run a single sc14 on a VN V6 with a smaller pulley (I used to make a kit using a modified VN A/C compressor pulley) they will average around 6psi.

[D-Train]

Thanks guys. When I said twin charge, I meant a s/c and a turbo. I should of been clearer. Something small for the bottom until the turbo gets off its arse and then there's the whole deal with intakes and shutting down the sc at the right time so there's no mass loss in the middle.

[WhaleOilBeefHooked]

A Real Supercharger can't be switched on / off, And although there are a few exceptions most don't work correctly, So forget the Mad Max set-up where it was either a dummy blower driven by electric motor or they turned engine on & off for the screen shots... Hairdryers & blowers have been paired together but again either 1 of them when correctly matched to engine output / revs should function better... Sort of like putting a roots style blower on top of another = "What's the point"

Edited by WhaleOilBeefHooked, 21 April 2015 - 05:20 PM.

[UCgazman]

Have a look at those pics, the toyota blowers have an a/c style clutch pulley so they can be turned on and off.

[EunUCh]

Bolt one of these on,frokal lag they reckon ? but they need a bit of lube in the fuel.

http://www.gmh-toran...er/#entry894083

 

No need for the "glimmer belt" 2 or 3 "V's" should work?

 

The clutched ones were used in Japan on Taxis or so the story goes?,they did work, they had some sort of "bypass" that would allow a diverted airflow.

Edited by EunUCh, 21 April 2015 - 05:58 PM.

[UCgazman]

Sc12's were on 4agze powered MR2's and the sc14 was fitted to 1ggze supra's, crowns, chasers etc. No need for any type of bypass, they spin freely with the intake suction and dont seem to restrict flow when off, even on a v6 commo.

[UCgazman]

Oops actually the Supra got the 1ggte (turbo version)...

[TerrA LX]

So while your blower is pumping out 14psi at 2000???rmp the turbo is spooling up at 5?psi, forming a vacuum behind the turbo, driving the exhaust out...  rpm increases, blower stays at 14psi while the turbo is now at 14psi at 6000???rpm filling the void?

Edited by TerrA LX, 21 April 2015 - 08:13 PM.

[TerrA LX]

My head hurts.

[Uncle Chop Chop]

Re the bandag bullet, the GM engines it ran came factory with a supercharger and twin turbo's, the supercharger was on all 2 stroke detroit diesels, Its function is a scavenge pump as the air/fuel doesnt go through the crank case like a typical 2 stroke engine, the crankcase pressure is what usually pushes the fresh charge in. The supercharger is there purely to push the fresh charge in. The turbo's were added later to boost performance, so nothing to be learnt there. 

 

Cheers. 

Correct, the blower didn't pressurise the intake charge. Which is why it's called a blower.

[D-Train]

This got lively quick. Thanks guys.
Just to clarify I am new to car engines beyond servicing oil and spark plug, so be gentle. Maybe a little lube first.
When people ask about superchargers, half say turbo gets better total performance, then the other half say s/c are cheaper and quicker to kick in, so that got me thinking, that's all.
There are a few different setups getting about on the net, DJs one, s/c feeding turbo with a bypass, and turbo feeding s/c with bypass.
Thers a lot of speculation with your idea DJ with the s/c restricting the boost from the turbo or the complete opposite of the s/c compressing the already boosted turbo air.
My idea was to have a sc12 being small enough not to drawer too much power to run, and also has the mag clutch to turn offend bypass when the turbo has spooled up.
originally I was just curious as to what people had done, but the more I look into it, the more I want to do it so I can get an answer.

[UCgazman]

Not an expert on twin charger setups like you're talking about but I have fitted a lot of toyota sc's so I thought I'd better point out that the sc12 is the smaller 4cyl version and would probably do nothing for a 202. Use the sc14!