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Dual Charged GTP

John_Shughart

John_Shughart

New member
I have been looking at a turbo kit for some time in the future. The aspects of being dual charged seem pretty good to me but i wsa just wondering what kind of numbers are put down with dual charging a car. And if there is just more benefit to running a straight up turbo vice the both of them.
 


IIRC Zooomers 97 GTP ran 9.7ish quarter mile times and around 140ish mph. Its been a few years since these numbers were produced but Im pretty sure he picked up 1 full second and almost 20mph by adding the turbo to the car. I am planning to do this on my rwd L67 Cutlass soon.... if I get some free time in the near future lol. I am using a T70 turbo in my setup and I believe Zooomer told me a long while back that going big on the turbo was ok, especially since you have the supercharger making instant boost and keeping the exhaust housing on the big side would help out since turbo lag wasnt really a concern and it will make more topend power. There are a few others that have tried this though I have never seen anyone else with numbers.
 
I'd love to do this! Wish I could setup something like this myself, it would be challenging. Most likely it would require dual intercooling to work right. For me it probably wouldn't be a good idea because the bumper support would have to go and more extensive tranny work would be needed too....
 
i have been looking at a turbo from Cartuning Performance and i plan on doing the motor work prior to the turbo. they sell the blank off plate for the super charger but i was thinking it would be sick to run em in series like that. and jsut curious about the dual intercooler comment just wondering the basis behind that and what makes you say that. but i figure if i already have the super charger, and i want the turbo. Why not?
 
A turbocharger heats up the intake charge more than a supercharger would. Both of them is insane and you'll knock so much you would probably blow the motor. You'd want to cool the air after the turbocharger (air to air intercooler) then cool the air after the supercharger (water to air intercooler) for the best bet at not grenading your motor. :)
 


Sabrewings said:
A turbocharger heats up the intake charge more than a supercharger would. Both of them is insane and you'll knock so much you would probably blow the motor. You'd want to cool the air after the turbocharger (air to air intercooler) then cool the air after the supercharger (water to air intercooler) for the best bet at not grenading your motor. :)
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oh yeah, totaly agree. I just didn't know if one really beafy intercooler would catch both of them good enough to do it. Still don't know if im going this route. IMHO i think anything under about a 13 second car is no longer a daily driver. so its definitly something im not willing to do for a while. but the prospects have me interersted.
 
To go twin charged and make it efficient, I would have to say you really need to take the M90 to it's limits first. Then I think zzp says a minimum of a 67mm turbo is needed when going twin charged. The benefits of twin charged would be no turbo lag, as the m90 is used and then after the turbo spools up, electronics will open the supercharger bypass. You would need a intercooler below the supercharger as the M90 is still producing hot air.

I would stay away from cartuning as they are not experienced in this area and I think special exhaust work is needed.

You would probably need #60 inj., unique pcm work done, stg 2-3 intercooler setup, front and rear powerlogs, stattama turbo crossover t4, a bigass turbo, a air/air intercooler, a cam, and a lot of extras.

And a transmission with $800 1" chain, probably $3500+ tranny rebuild altogether.
 
I'm definately considering this option of going twin charged. I have been doing my homework on it, and my setup would be ideal for this. All I would have to do is upgrade to the GMR 1" chain and buy the twin charged setup. Oh...axels would be a must too! I already have ZZP stg 3 ic and the porting on my SC is already ideal for this. I would just bore the bypass hole a little bigger and install a bigger plate. I really want to do this setup. T70 as well here.

1 thing I would like to try thought is different cams. I have the XPZ right now, and used to have a thrasher race cam. Everybody stated that you would have to have a huge blower for the Thrasher to perform and the twin charged application will certainly give enough boost. I'm just wondering how well it would work with this application. The Thrasher Cam sounds the best of any cam I have heard in a GTP by far! :th_sinister:
 
FoSHO99 said:
To go twin charged and make it efficient, I would have to say you really need to take the M90 to it's limits first. Then I think zzp says a minimum of a 67mm turbo is needed when going twin charged. The benefits of twin charged would be no turbo lag, as the m90 is used and then after the turbo spools up, electronics will open the supercharger bypass. You would need a intercooler below the supercharger as the M90 is still producing hot air.
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Ive never seen an application on any car that opened the bypass once the turbo was spooled. Most of the time people just cram the air through the rotors, as spinning rotors are less restrictive then your dime sized bypass valve. Its a good idea though. But running a small pulley then opening the valve would still cause alot of parasitic loss from spinning the blower so fast.
I would probably just run a large pulley like a 3.4(4 psi) or 3.2(6psi), depending on how much lowend grunt i wanted, and then turn the turbo up accordingly.
 


TheRealKoop said:
Ive never seen an application on any car that opened the bypass once the turbo was spooled. Most of the time people just cram the air through the rotors, as spinning rotors are less restrictive then your dime sized bypass valve. Its a good idea though. But running a small pulley then opening the valve would still cause alot of parasitic loss from spinning the blower so fast.
I would probably just run a large pulley like a 3.4(4 psi) or 3.2(6psi), depending on how much lowend grunt i wanted, and then turn the turbo up accordingly.
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I would say the electronics the are used on a twin chared set up would have to read a certain amout of boost pressure before the blower from the turbo and then open up the bypass valve. Once they bypass is open, the air will flow down there and some past the rotors as well. Once the bypass is open, the S/C will no longer be making boost, it should just be generated from the turbo and the s/c should be acting like a pump.
 
Yeah, and I think they recommend the 3.8 pulley for twin charged, when everything does get spooled up you don't want any extra heat created or hp loss from a small pulley. I wonder what the dyno charts would look like from this...
 
FoSHO99 said:
Yeah, and I think they recommend the 3.8 pulley for twin charged, when everything does get spooled up you don't want any extra heat created or hp loss from a small pulley. I wonder what the dyno charts would look like from this...
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yeah man ive been looking for dyno charts on this for a while now. it'd be sick.
 
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