phat shaft 62 vs factory turbo = big difference in mpg?
 

recently had a new long block and injectors installed.

using the trucks computer to measure MPG:
current: 17
prior to new setup: 23

only difference is, i'm now running the factory turbo and i was running a phat shaft 62 before.

can a turbo make that much of a difference?

u were getting 23 before the new long block? and 17 after the long block and turbo? if so, how many miles is on the long block? have u checked ur fuel to ensure the injectors arent leaking?

id hand calculate ur milage, with performance upgrades, the lie-o-meters get farther and farther off.

23 with messed up motor and phat shaft 62.
17 with new long block, new injectors, and factory turbo.

less than 1,000 miles on new block and injectors.

this weekend i installed a new intake horn, cai, and changed the oil. didn't notice anything leaking around the motor and the oil looked normal.

my guess is the motor just isnt broke in yet. give it a couple thousand, hand calculate ur milage and see how it comes out :tu: and yes a turbo that size wil help milage some also.

cool, i'll top it off today and see how it goes.

looking forward to getting that phat shaft back in the truck!

I wouldn't consider it "broke in" until after it passes at least 30k.

how long would you wait to put the phat shaft 62 on?

I don't think the turbo has anything to do with break-in. As long as you have the fuel to spool it, I'd put it on and drive it balls out with a 5ton trailer behind it for a few months. That should help it get started to break in.

u can throw the turbo back on any time ya want. once ya got around a 1000 miles on it, id change the oil for the first time, and put fresh oil and filter on it. then go to the 5k interval. but thats just me.

^ I would do it at 500 miles personally but you want to change it somewhere in that area for sure.