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turbo guys, are you boosting with 3.42's at highway speeds?

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Old Jan 21, 2013 | 09:59 PM
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Default turbo guys, are you boosting with 3.42's at highway speeds?

Evening gents,
I'm bringing my truck to get the rear end rebuilt and an eaton installed this week and I want to go drop down to 3.42s from my 3.73s because a turbo is in the new future. I know its dependent on the turbo characteristics, but in general, are you making boost with 3.42s at highway speeds? I have a rcsb 4.8l 2wd. THANKS
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Old Jan 21, 2013 | 10:05 PM
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Yes, easily makes boost at highway speeds. As soon as you go wot the boost is there.
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Old Jan 21, 2013 | 10:24 PM
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right, i guess i didnt word my question properly. I just meant when you're cruising at highway speeds and only at partial throttle doing a constant 75 mph in over drive, for example. I didn't know if the load on the engine at those higher constant speeds typically produces no boost, 1 psi, 5 psi, etc. Just curious if its gonna be eatin gas with 3.42s at constant highway speeds. Its my first turbo build so i'm not really sure what expect. (PS: I hate bein a newb)
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Old Jan 21, 2013 | 10:27 PM
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Originally Posted by lycominghunter
right, i guess i didnt word my question properly. I just meant when you're cruising at highway speeds and only at partial throttle doing a constant 75 mph in over drive, for example. I didn't know if the load on the engine at those higher constant speeds typically produces no boost, 1 psi, 5 psi, etc. Just curious if its gonna be eatin gas with 3.42s at constant highway speeds. Its my first turbo build so i'm not really sure what expect. (PS: I hate bein a newb)
HMMMM, if it did do that, then something is wrong with the turbo kit...
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Old Jan 21, 2013 | 10:47 PM
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Originally Posted by BlackGMC
HMMMM, if it did do that, then something is wrong with the turbo kit...
ok sounds good to me. 3.42s it is lol
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Old Jan 21, 2013 | 10:48 PM
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No, you shouldn't.

With my 3.23s at 75 I'm still pulling 5-10 inches of vacuum.
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Old Jan 21, 2013 | 11:17 PM
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You will never notice a difference between 3.73 and 3.42

Last edited by Atomic; Jan 22, 2013 at 12:01 AM.
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Old Jan 21, 2013 | 11:46 PM
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Originally Posted by Atomic
You will never notice a difference betwee. 3.73 and 3.42
This.
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Old Jan 22, 2013 | 04:43 AM
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Originally Posted by Atomic
You will never notice a difference between 3.73 and 3.42
This... just swapped from 342 to 373.. feels exactly the same to me.
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Old Jan 22, 2013 | 05:21 AM
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AWESOME. thats exactly what i wanted to know. Thanks guys
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