View Poll Results: If a vendor made a compound turbo kit for the LNF Cobalt I would you purchase it?
YES
8
30.77%
NO
18
69.23%
Voters: 26. You may not vote on this poll
Compound turbo!!!
Drag racers are certainly using compound setups. Helps get you that 30psi at the line while not sacrificing top end power at all. The link posted was a RWD Talon Drag Racer. I read the whole thread on DSM Tuners a week or 2 ago and they were both posting in there about their cars and setups.
Senior Member
Joined: 05-04-10
Posts: 892
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From: RI
Drag racers are certainly using compound setups. Helps get you that 30psi at the line while not sacrificing top end power at all. The link posted was a RWD Talon Drag Racer. I read the whole thread on DSM Tuners a week or 2 ago and they were both posting in there about their cars and setups.
Pretty sweet ride.......very fast
he is building a new compound turbo set-up again
Senior Member
Joined: 07-23-10
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From: Carlsbad, CA
The problem still lies in the fact that the transmission in these things will get ripped apart. I think before the turbo would go in I would get the Quaife (sp.?) 6 speed set up for the Saab.
Former Vendor
Joined: 06-03-08
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From: Grand Rapids, MI
I don't see any reason to compound turbo a FWD 2.0 car unless it is built to achieve(and withstand) 1.4 or quicker sixty foots. Ryan has already been in the 1.5 sixty foots on his 362 turbo which can support over 700whp. That was with a minimal launch tune and leaving the line at 4psi. He could launch at 30psi if so desired. I don't think that would go over too well.
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Joined: 05-22-09
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From: Ohio
From reading everything I am less sure of a compound turbo setup. I though a compound turbo was superior to any one single turbo, however if drag guys arent doing it, auto x guys arent doing it, 2012 Indy car isnt doing it, 2013 F1 isnt doing it, Rolex 24 isnt doing it and manufactures arent doing it. There must be a reason they are not making a compound turbo system.
So, its all about power band right? Im guessing a compound turbo is gives you a wider power band, however if you have one large turbo and never fall out of the power band then is it pointless to do a compound turbo?
Here is my theoretical scenario for everyone to discuss:
You have 2 identical cars.
Car 1 has one large turbo (600hp@7000rmp 600tq@4500rmp)
Car 2 has a compound turbo setup (600hp@7000rmp 600tq@4500rmp)
Who would win in a ź mile, 40-120, 60-100, 100-150, 0-100-0, autoX, oval?
So, its all about power band right? Im guessing a compound turbo is gives you a wider power band, however if you have one large turbo and never fall out of the power band then is it pointless to do a compound turbo?
Here is my theoretical scenario for everyone to discuss:
You have 2 identical cars.
Car 1 has one large turbo (600hp@7000rmp 600tq@4500rmp)
Car 2 has a compound turbo setup (600hp@7000rmp 600tq@4500rmp)
Who would win in a ź mile, 40-120, 60-100, 100-150, 0-100-0, autoX, oval?
Senior Member
Joined: 05-04-10
Posts: 892
Likes: 3
From: RI
I don't see any reason to compound turbo a FWD 2.0 car unless it is built to achieve(and withstand) 1.4 or quicker sixty foots. Ryan has already been in the 1.5 sixty foots on his 362 turbo which can support over 700whp. That was with a minimal launch tune and leaving the line at 4psi. He could launch at 30psi if so desired. I don't think that would go over too well.
Senior Member
Joined: 05-18-05
Posts: 1,070
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From: Boston & SoCal
Supercharger/turbocharger combos (i.e. twin-charging), compound turbos, etc. on a four cylinder doesn't really make a lot of sense unless you're just doing something to be different or have a very specific operating requirement that can only be filled by such a setup. It may not be as "sexy" and "unique" but for most LNF Cobalt owners that aren't building an all-out, drag-only track car there are quite a few single turbo setups that can provide great spool characteristics and great flow to support more power than can realistically be used out on the street.
Seeing what you all have written about compund turbos, I guess it’s just not a good idea to put one on a FWD. Ahhhh I love this car, but the launch will never be as good as a RWD or obviously an AWD…….Then again we have less drive train loss than RWDs or AWDs. So, our cobalt’s territory is Roll Racing. What is a FWDs drive train loss 10-15%? FWD is 20-25%? AWD 30-35%?
Senior Member
Joined: 07-23-10
Posts: 3,451
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From: Carlsbad, CA
Those are general realms... It is honestly different in every car with every different clutch, flywheel, axle, brake rotors, wheels, tires, etc... All of which contributes to a drive-train's rotational loss. If you really want a good setup a Porsche is a nice example of best of both worlds... Mid or rear engine cars with rear wheel drive have the same losses (more or less) as a fwd car.
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