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Discussion Starter · #1 · (Edited)
hey guys needs some help. when im in 4th gear and roll on the throttle making my way to full throttle(to prevent downshifting) my turbo sounds like it all of a sudden takes off and spools like crazy around 80 mph once she really gets going. it will also does the same in 3rd with tow/haul on under the same type of acceleration. does anyone know what this might be? thanks again
 

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hey guys needs some help. when im in 5th gear and roll on the throttle making my way to full throttle(to prevent downshifting) my turbo sounds like it all of a sudden takes off and spools like crazy around 80 mph once she really gets going. it will also does the same in 4th with tow/haul on under the same type of acceleration. does anyone know what this might be? thanks again
First off, you have a 48RE. The 4 stands for 4speed, not 5. Tow/haul is 3rd gear.

From what you described I don't know what the problem is. Your turbo spools up and you go faster...:confused013:
 

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Discussion Starter · #3 ·
my mistake no no real increase in speed and it seems like it happens all of a sudden. it doesnt sound right.
 

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The turbo will start to spool up then REALLY spool up fast. That part is normal. On a VGT turbo it constantly spools up and does not have this effect as bad.

Just wait till you drive in a truck with a larger/laggy turbo. Once that sucker lights it is insane! Basically times what you are feeling by 10.
 

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VGT(Variable geometry turbo) is on the 6.7l Cummins only, no 5.9 has it stock and are really not much more efficent IMO. It does have a huge decrease in lag though.
 
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