Cobra20

What do u guys think it would take to make a compound charging set up work??

JZ 97 SS 1500

iTrader: (2)

Switch to a diesel..... No sense to run that on a petro engine. We don't need high pressure ratios and most gas engines can't support it anyway.

Jose

98turbls1

iTrader: (17)

Like a turbo with a roots blower?? I think that it would be great if you could devise a clutch system or something in the blower to cut down on the boost when the turbo kicks in...It would be the cost of a mansion to create something like this but if you wanted a low end and top end this would be killer....But you really wouldn't need to do this...The point of running a nasty turbo on a huge v8 is to have your cake and eat it too...The v8 allows to have enough torque to pull the water out of a river and enough top end to beat a $200,000 pasta rocket...That's the intent...But being car nuts it's always cool to say what if and then some crazy ******* with enough money finally does it...BTW you might look at the Rotex...As far as I can see or read I believe that it's kind of the setup with a dual speed impellars inside but it's centrifical...But as for the first I think that you would have an over boost if you didn't turn down the boost from the blower or roots if you're running a roots and centrifical SC...Have fun with the idea and I can't wait to see the responses...

Cobra20

I have been tossing around the idea of using the rotex superchargers with a sts turbo style system. By the way does any one make a reinforced LSX cast iron 6.0L block??

Wnts2Go10O

iTrader: (12)

maybe time for a Warhawk block

99.9percenter

iTrader: (2)

Get a screw charger and a large turbo. At higher revs the blower belt will put torque back into the crank!!

LSs1Power

iTrader: (5)

There is an EVO who did this already with great results. I think he was running a 1.3L or so Blower + a huge turbo GT55 or something from that size that usually spool up at 6500RPM on a stock EVO. With the blower he is spooling that huge turbo at 3500RPM and keeps pulling until 8500-9K RPM. It can be done, but it would take alot of money to pull it off. Just imagine a KB and 100mm+ Turbo on a high revving 8K RPM forged 346-350cid LSX with 265cc heads....Ahh Ymmy.

V8_DSM_V8again

It was a 2.3 liter.

Single stage lsx engines sometimes have trouble keeping the heads down..

I would compound sequential turbo charge... two stage turbo system... Before I would combine a turbo with a SC... Much more efficient than twincharging.

What you guys are talking about SC with a TC is called twincharging..

Cobra20

do u have any more info on how they did it with the Evo and I think the warhawk block will be a good idea, but if I do it with the warhawk block I will more than likely go with the 9.8" deck height and 4.125 bore and a 4.250 stroke, then I would have a 454 LSX engine

LSs1Power

iTrader: (5)

This is the thread. I stopped reading after 20 pages.

http://forums.evolutionm.net/showthread.php?t=127361

hellbents10

iTrader: (10)

If you were going to twin charge why would you want all those cubes. Less cubes(stroke) equalls less side loading and more power handling ability.

Cobra20

well it will give me a bit better low end torque production I could always drop it down a quarter of an inch then it would be around 427 cubes

stevieturbo

Someone asked a similar question over on ls1.com

I posted this link there too. its an old Opel Manta in Sweden running a 2.3 Volvo engine with a supercharger and a turbo.. Check out the videoclips.

http://www.newtiburon.com/forums/sho...081#post540081

Here is Forcedairtech's Subaru



They did a twin turbo version too. Seems rather pointless though.

Lancia's S4 Group B Rally car from the mid 80's also ran a blower and turbo.

DeltaT

iTrader: (5)

Hans, the Rotrex are centrifugals and don't produce low end boost where you'd want it for your project. I would go twin-screw through and A2A IC, then into a large turbo, then through another IC. That's compound charging. Some of the things described above are dual charging systems, where either 1 or the other is supplying boost, but not both. Needs some sort of selection valve.

Either system would be a lot of work and take lots of space. Lots of valving and bypass stuff. Problems like ICs and plumbing needed for both vacuum and boost, control right around the crossover point between chargers, throttle positioning, etc.

Jim

stevieturbo

Although, if you had a suitably sized twin screw, would there really be much point in adding a turbo ?

DeltaT

iTrader: (5)

Sure, a nice large turbo that was very efficient at rpms over say 5000, something that usually was unacceptable. Size the twin screw for a steady 12 or so from 2200rpm on up, and you'd have a killer combo.

Jim

Cheatin' Chad

iTrader: (3)

You will need money more than anything to make this happen.

I do not think this is neccessary for power. However, I am not one to discourage innovation.

Every successful instance of this has a turbo pushing into a positive displacement blower. Inlet restrictions are a big deal on the PD blowers and the turbo can alleviate this.

This was used quite a bit first half of the 1900's on armored vehicles,buses and commercial trucks.

With the efficiency improvements of turbos and belt driven superchargers this is almost useless on gasoline engines.

Diesel and Alcohol are another story however.