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Old 09-22-2005, 04:54 PM
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Turbocharging a 350 Chevy

Hey folks, another turbo question ... This time about doing a Chevy small block instead of the big block a while back. I'm looking at the possibility of doing a turbo setup on my S10 and retaining the carburator setup. I figure I could just use a pressure plenum to do that, but the question is, what turbo to use. I'm looking to use something that is readily available, that is, Powerstroke, Cummins, or Duramax turbo. I've heard the Powerstrokes are easier to deal with since they're Garrett turbos, but from what I understand, the Cummins is able to make more torque than the others with a much smaller displacement. Some specifications on my engine since I know those matter also:

350 - .060 overbore = 360 cid
2-bolt ARP main bolts
SCAT I-beam rods (550 hp rated), floating pins, capscrew ARP bolts
Forged, unturned crank
ATI balancer, SFI
B&M flexplate, SFI
Wiesco pistons, 10.2:1 compression (I know its a little high)
882 heads, bowl ported and polished real shiny on exhaust, gasket matched intake and light polishing, no bowl work, 2.02/1.60 valves
cam: 243/243 @.050 mech. flat tappet w/ .517 lift on both
Magnum roller tip rockers
Crane kool poly locks
RPM Air Gap intake
750 mechanical secondary carb (for pressurized box)
MSD BTM ignition box

For the intercooler setup, I'm probably going to go with an air-water setup so it's more compact up front of the truck (driver's fenderwell area).
Also, will use water/alcohol injection.

I don't intend to get things much more than 8psi boost with 93 octane, but maybe 11 psi or so with some race gas and the intercooler/h2o injection.

Maybe Chris would have some helpful info on why I SHOULD NOT use the carb/box deal.



Last edited by radracer43; 09-24-2005 at 12:58 PM.
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Old 09-23-2005, 11:55 AM
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Carbed systems are going to be much harder to tune with a Turbo'd setup. You also will not have the ability to run a knock sensor to determine at what point the boost is too much for the timing/mixture. I would seriously think about an FI setup if your planning on running a Turbo'd engine.

Secondly, I dont think your boost goals of 8-11 PSI really warrant a water/alky injection setup. As far as I've read, thats somewhat old technology and isn't as efficient as other more modern setups. Running a good intercooler and keeping your mixture and timing correct, you shouldn't have much trouble with 8+ PSI.

Also, you are starting with some really high compression to be running a Turbo. It would be better to shoot for 9:1 or perhaps a tad bit higher for your intended boost range.

I am sure Chris will jump in with much more information (and possibly correct me on some things lol).
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Old 09-24-2005, 12:59 PM
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Thanks for the reply. I think that I may need to make a new post though because after taking a second glance, it appears that my thread is in relation to the TH-350 transmission.
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