Depends what you mean by small.

It would still have to have a relatively high choke point, but it wouldn't be required to sustain high pressure ratios.

Both compressor's would be well inside of their thermal efficiency range so heat isn't really an issue. You would also still be using the stock air-water system which has been shown to perform extremely well.

 

true but cooler is better so i would add a duel bulb cry0 kit(my personal fav way to cool the air....).

ah i cant wait till i have the $$ to start fuxing with this

 

I have a GT25 for sale

 

$$$$$$$$$$

 

If that is a price on how much, I would let it go for $750.

 

so then in addition to the turbo setup you would want a dual pass, cobra h/e and water/meth? That seems very simple actually

 

exactly... i am not a fan of the meth injection though... it is great at dropping temps but it eats the Teflon coating in the s/c the cru0 kit put a "bulb" in the intake and passes co2 through it to cool the air via conduction the waste co2 is then sprayed onto the fins of the intercooler or secondary h/e depending on what you want. i really like this idea

 

subscribed

 

so is someone gonna take the dive again to a super turbo? I would love to see it happen again and honestly I wanted to do this in 05 when I first bought my car.

 

like i said i am in about a year when i have the parts and some $$$$$

lets see list of stuff i am going to get b4 i start to build it:

Cry02 kit
solid engine mounts
ploy tans mounts
multi disk clutch
ploy bushings
vibrant header
corsa sport exhaust
and stage 2 axels
then comes all the needs to turbo..... phew this is gona be fun

 

http://www.redlineforums.(com)/forum...ht=twin+charge

that is what happened to the original car.

you want answers. go poke around the rlf forums.

 

wouldn't you want a larger turbo rather than a smaller one? I mean I figure a supercharger is at it's peak efficiency range in the lower rpms so if you want a turbo that's going to be at peak efficiency in the higher rpms then you'll want a larger turbo.

Personally I like the idea. You would get all the instant low-end grunt from the supercharger AND the higher end screamage you get from a turbo setup. should be great for a nice flat powerband. I don't think I would ever blow the money on it, but it's cool to see people dive into the engineering aspect of it.

 

Maybe this will work.



Yes, a larger turbo.

 

why does the blower look like a thermos?

 

You would want one to be efficient at high flow rates but wouldn't need it to be efficient at high pressure.

Because you are compounding compressors, the pressure after the first compressor would be multiplied by the second one (the supercharger in this case). When you normally read a compressor map, the axis labeled (PR) pressure ratio is the multiplier for pressure in to pressure out. Normally this ratio would be input with ambient pressure. However in this case it would be the pressure output by the turbo before it reaches the supercharger. You would have potential of achieving too high boost levels by effectively compounding too high of a pressure.

As an example, a supercharger at 2.0pr would normally output 29.4psi above a total vacuum or as we usually see it 14.7psi boost. Now take as little as 7psi of pressure from the turbo and it will now output 43.4psi above total vacuum or 28.7psi boost.

 

By any chance could you post the equation of pressure calculation for this case?

Now that you mention it, it look like a thermos. Its just for illustration

 

Ambient pressure (14.7psi at sea level) X Pressure ratio = total pressure above ambient

total pressure above ambient - ambient = total boost (the number you see on the gauge)

Twincharged setup:

[Ambient pressure + turbo's boost pressure] X supercharger's pressure ratio = total pressure - ambient pressure would equal total boost

I think I have that typed correct.

 

Which SC pulley will provide 2.0PR? or less? Is it the stock pulley?

 

I believe the best choice is a 3.6" pulley. They are stock for one of the generations of Grand Prix GTPs iirc. You would have to fab a custom idler pulley or longer belt as this is larger than the stock SS pulley.

I'm fairly certain a stock sized pulley would work as well.

 

heres a totally noooob question but..how do i subscribe to this thread or just posting will do it haha..this is super interesting i wouldn't mind doing this myself in about a year or 2 if it works

 

That's why the twincharged redline uses a 3.8" pulley. It seems the stock pulley like you said would work.

 

the LNF runs 9.5 compressions ratio piston's. the LSJ runs 10.5 piston's. if your gonna do a piston swap jus go turbo..alot easier and the power gains will be atleast 300 WHP. 06g85 went turbo and saw 300 + at 85% throttle on a conserative tune at the wheel's... dont know excatly how he did it tho.

 

HAHA

Ok so check this out, my buddy JUST called me like 30 seconds ago to tell me one of his turbos is fuct. Hes got a 93 VR4 twin turbo (obviously). So he's going to give me the good one and his front mount too. Im not really interested in getting 400hp Im more looking to get like 300 reliable HP. I mean if i put the stock pulley back on the M62 and get one of his turbo's which was boosting his engine to 10psi i think that will be plenty to get reliable 300-325 ponies. I mean look at all the effed motors we have from overspinning and heatsoaking the Heaton. I think im gonna try this....

 

I understand the LSJ has 9.5 CR pistons not 10.5.

 

https://www.cobaltss.net/forums/forced-induction-50/twincharging-balt-81644/