Quote:
Originally Posted by jesdude7789
Only the 5.3 has the AFM? I found a guy in canada that did the 4BT swap on his 04 tahoe and it looks super simple and he is getting awesome fuel mileage with it on long trips. It's a stock engine with a new turbo and he can get to 55mph in about 9 seconds so that is respectable. That is with the 4l60e behind it. I'm not sure what his rear gear ratio it's but probably 3.42. I have 2.73 in my 87 truck and I believe my 1990 suburban has the 3.08.
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4bt is but i think you need a bread truck transmission adapter. still its slow and the mpg gain really doesnt help much on diesel with the added cost of fuel and upkeep an 4bt and new turbo is alot of money vs a ls engine. the 5.3 and the 6.2 has afm. the 6.0 and 4.8 did not ever have it. the 4.8 only had a 4l60e behind it ever and didnt have vvt. the 6.0 after or 07 in the newer body style had vvt and the 6l90e behind it. vvt really wakes them up. it gives the engine plenty of low end then the vvt adjust the timing to give it top end. its not like a honda setup it just adjust the cam profile and timing. you can delete afm on 5.3 pretty easy too. just requires a few hundred bucks and tuning. now this is the truck engines i think some cars that had 6.0s had afm never fooled with them. i know the police cars didnt but idk about gtos g6s etc...