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Installed a turbo 350 bad choice

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Old 07-12-2018, 04:10 AM
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Installed a turbo 350 bad choice

I have a 82 camaro with a 350 sbc with a k12-600-4 comp cams cam in it a edelbrock intake and carburetor a turbo 350 with a 2,800 stall and 2.73 rear gears and the car runs sluggish it has no power the engine sounds really powerful but that doesnt help. And the transmission and motor has just been rebuilt if anyone can help me figure out what that is the problem i will thanks ypu a lot
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Old 07-12-2018, 05:34 AM
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Re: Installed a turbo 350 bad choice

Those 2.73 rear gears are probably what's holding your car back. I would go with 3.73 to wake your car up or at least 3.42 minimum. What converter are you using? Did you check the actual stall of that converter?
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Old 07-12-2018, 05:36 AM
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Re: Installed a turbo 350 bad choice

Thanks for replying and Yeah i have a set of 3.73 i have to install but i havent got to it just yet and its a 2,800 stall thats what summit said when i purchased it
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Old 07-12-2018, 08:49 AM
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Re: Installed a turbo 350 bad choice

The 2800 stall will work just fine with that cam. Do the rear end next. Next build I would probably stay away from the thumpr series if you want performance they are really just for noise.
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Old 07-12-2018, 08:53 AM
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Re: Installed a turbo 350 bad choice

Not sure what cam that is... if it was chosen for "sound", then it's optimized for high RPMs rather than low, and you may have a fundamental mismatch.

What converter is it EXACTLY?
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Old 07-12-2018, 08:58 AM
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Re: Installed a turbo 350 bad choice

http://www.compcams.com/Company/CC/c...?csid=107&sb=2

COMP Cams Thumpr Hydraulic Flat Tappet Cam and Lifter Kits K12-600-4
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-5,800
Intake Duration at 050 inch Lift: 227
Exhaust Duration at 050 inch Lift: 241
Duration at 050 inch Lift: 227 int./241 exh.
Advertised Intake Duration: 279
Advertised Exhaust Duration: 297
Advertised Duration: 279 int./297 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.479 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.465 in.
Valve Lift with Factory Rocker Arm Ratio: 0.479 int./0.465 exh.
Lobe Separation (degrees): 107
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Old 07-12-2018, 06:00 PM
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Re: Installed a turbo 350 bad choice

Kinda what I thought...

Built for "sound"; not speed, power, or torque.

A definite handicap for a car where actual "performance" is the goal, especially with regard to how it leaves.
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Old 07-13-2018, 09:37 AM
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Re: Installed a turbo 350 bad choice

Why is the exhaust lift so low with so much duration?
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Old 07-13-2018, 09:41 AM
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Re: Installed a turbo 350 bad choice

Originally Posted by Manic Z View Post
Why is the exhaust lift so low with so much duration?
​​​​​​ To make the idle quality poor and sound like a big cam
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Old 07-15-2018, 10:04 AM
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Re: Installed a turbo 350 bad choice

Sorry for not replying guys ive been back up with family and work that i havent had time to log in and if this cam is just meant for sound is there one you can Recommend for power and torque
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Old 07-15-2018, 10:42 AM
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Re: Installed a turbo 350 bad choice

XE268 and a 3.42 gear
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Old 07-15-2018, 10:44 AM
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Re: Installed a turbo 350 bad choice

I just got a really good deal in a posi unit with 4/11 gears will this work with this cam
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Old 07-15-2018, 12:10 PM
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Re: Installed a turbo 350 bad choice

Yes it will work with those gears.

If that's the S10 "posi", as is typically found with 4.11 gears, you don't want it.



This is why. It is a POS: the way it works is, NO POSI ACTION WHATSOEVER occurs, that is to say it has COMPLETELY unlimited "slip", until the RPM difference between the 2 axles reaches about 150 RPM or so; at which point it locks up with a bang. Literally. Then if the vehicle has lots of power and also traction, the photo happens. Sometimes it's so violent that it sends the shrapnel through the cover and even into the gas tank. (!!!!!) So, if you look inside the window of the carrier and see 2 little bitty weights on 2 teeny tiny shafts, DON'T put that in your car. You can see one of the weights in the photo, at the bottom right, kind of half behind one of the spider gear thrust washers.
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Old 07-15-2018, 12:33 PM
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Re: Installed a turbo 350 bad choice

Thanks for the advice but its a yukon posi and im adding the 4.11 on that
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Old 07-15-2018, 06:56 PM
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Re: Installed a turbo 350 bad choice

Yeah then that should be OK.
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Old 07-15-2018, 07:18 PM
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Re: Installed a turbo 350 bad choice

Would it hesitate to accelerate with the 700r4 a xe268 cam and 4.11 gears or should that make it run right
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Old 07-15-2018, 09:29 PM
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Re: Installed a turbo 350 bad choice

I doubt ANY engine combo would "hesitate to accelerate" with 4.11s. From a stop at least. Now, at 60 mph, ... could be a different matter. But that much of a gear change will make the car feel like a jackrabbit off the line, compared to those highway gas-mileage gears in it now.

Personally I wouldn't put that much gear in a car with no overdrive in the transmission, in 2018. Speaking strictly as someone who had a 79 Z28 w/ 4.10s in it, in 81. (traded that car in on my 83) Back in the day when we had just got stuck with the national 55 mph speed limit, and the cops would bust you for 56, they were OK; nowadays though, you're going to be at like 4000 RPM at 75 mph. I doubt you'll enjoy that for very long, if your driving habits involve much freeway distance. Butt hay, we all gotta find out about these things for ourselves, and depending on where you go and what you do with the car, you might really like it that way. Only way way to find out I guess.
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Old 07-15-2018, 10:16 PM
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Re: Installed a turbo 350 bad choice

Yeah the car will never see any freeway at all street only
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