Twin Charging

[Big_Jeff]

its a new sensation that is sweeping through... i was just wondering if anyone had any experience with twin charging. example. a turbo that feeds a roots/screw type supercharger. i'm currently saving for a desperatly needed rebuild and am wondering if this may be an option. i know with going this direction ungodly amounts of power can be made. example https://www.youtube.com/watch?v=HmscSzFurwg . of course this guy has loads of money and is running the super/turbo chargers differently but its basically the same idea

[pocket-rocket]

That has to be the coolest thing I've seen in a while, thanks for sharing

If someone here were to do it, you would most likely want to be rwd with a T56 and a solid rear axle, otherwise transmissions are going to get expensive. Although the progressiveness of the power mentioned would help the components live a bit longer than a strong and sudden shock load.

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[Big_Jeff]

i've been thinking about this for a while... kinda like a fantsy, and those things mentioned were part of the idea. i've just been wondering how our engines are holding up to 20psi of boost...

[ericjon262]

it's just not that practical for our motors, nobody makes a roots/whipple/twinscrew for them, and the added costs don't support the gains IMO.

[Big_Jeff]

why wont a roots/screw charger fit on our motors? i've been told they wont fit but never why they will not fit... theres also quite a few benifits to going this route too. you dont have to have the turbo produce insane amounts of boost. about 10 psi will do depending on the amount of boost the supercharger is making but if its 10 and 10 ( supercharger psi, and another 10 from the turbo) you end up producing much closer to 24 psi of boost instead of 20 so neither charger has to be overworked to produce large amounts of boost. i've been reading up and have found a few great articles about this subject. http://www.eng-tips.com/viewthread.cfm?qid=174690 this ones a great read if you've got some time. explains some of the basics.

[ericjon262]

why wont a roots/screw charger fit on our motors? i've been told they wont fit but never why they will not fit... theres also quite a few benifits to going this route too. you dont have to have the turbo produce insane amounts of boost. about 10 psi will do depending on the amount of boost the supercharger is making but if its 10 and 10 ( supercharger psi, and another 10 from the turbo) you end up producing much closer to 24 psi of boost instead of 20 so neither charger has to be overworked to produce large amounts of boost. i've been reading up and have found a few great articles about this subject. http://www.eng-tips.com/viewthread.cfm?qid=174690 this ones a great read if you've got some time. explains some of the basics.

it's not that it can't be done, it's that nobody has a kit available off the shelf to do it, and to make your own kit gets very cost prohibitive quickly.

[Big_Jeff]

what kind of fabrication would be needed to fit an m90 or m112 to a 3.4 rwd. would it be easier to do with a hybrid block? i've already got an m90, my neighbor had an extra one laying around...

[ericjon262]

it's been done, but I have yet to see it done well, I wouldn't do it with iron heads, why bother? your heads are where you make power period. yes you can put boost to them, but boost on 3x00 heads makes a good thing better. I would flip the supercharger so the outlet points up, and then modify the upper intake to redirect the air back down into the engine, similar to how it's done on a Zr1 vette. but again, it's alot of work for not alot of gain....

[timg]

I wouldn't do it. It's been done before (quite a few of the GTP turbo guys started this way), but is very complex, expensive, heavy, and performance is lacking. You have to worry about intercooling both systems and finding room for both. The MP90 is great at creating hot air, but not much else. Modern turbos can have very good power throughout your RPM range. They won't have the same low end as a positive displacement supercharger, but think of it as traction control. If you are thinking about a roots type supercharger, the TVS series is MUCH more efficient than the older MP range.

Tim

[ChevyBlown]

twin whipples

http://www.youtube.com/watch?v=7sTVwrOjMn4

[AleroB888]

I wouldn't do it. It's been done before (quite a few of the GTP turbo guys started this way), but is very complex, expensive, heavy, and performance is lacking. You have to worry about intercooling both systems and finding room for both. The MP90 is great at creating hot air, but not much else. Modern turbos can have very good power throughout your RPM range. They won't have the same low end as a positive displacement supercharger, but think of it as traction control. If you are thinking about a roots type supercharger, the TVS series is MUCH more efficient than the older MP range.

Tim

I have witnessed an older GP w/M90 run altitude-corrected high-12s in CO, with nothing but a smaller pulley, bigger injectors, E85 in the tank, and a tune. That's not too shabby.......

[timg]

I think Shane's old Z34 Lumina with a L67 swap was pulling similar times at Bandimere. The L67's can be made quite fast (compared with stock) on the M90, but when it comes time to make big power, it's just not there. The TVS series seems to be much more efficient at making big numbers (I just saw a TVS2300 dyno video that was over 1000 hp and 900 ft-lbf).

Tim