if im thinking right, the 2009 didnt, but the 2010 and up does.

 

Oooh nice.. I found an 09 and an 11 I like but the 11 is 5 grand more. But the afm would be good since I commute.

 

theres a huge difference from the 09 to the 11.

computer programming is miles apart.

 

According the info I can find, all Gen IV Vortec V8s have Active Fuel Management... except the LH8, which is in the Colorado.

Guess it's one of the things they removed to shoehorn it in there, since it requires extra solenoids.

Next time I get a chance I'll look at my manual, though. Would be nice if it had it.

 

i could easily be wrong.

 

Yeah. The price is miles apart between 09 and 11 too!

 

Yea im sure it is better in 11 since 09 was the first year. I'm wondering tho, I saw a thread about having the PCM updated by dealer so I wonder if the software can just be updated in an 09 or if it's different hardware.

 

totally different.

avt had to rewrite my entire programming on my 09.

it ran like hell after they did tho.

 

Completely unrelated. Your avatar made me :lol:

 

active fuel management is where the engine drops cylinders to save gas, used to be called Displacement on Demand. I don't think the colorados have it at all because the gas mileage is nowhere near what it should be for a vehicle with it.

 

Good info guys? I can't figure out why they wouldn't put it in the canyon..maybe they thought the economy was good enough without it? My buddy has an 09 silver ado 1500 that has it he drives like a wild man on the highway and still gets 18 mpg. I drive like grampa joe on the highway in my 5cyl and I get 22 after 1000 in mods lol wtfffff!!! I would think a v8 canyon wit the afm could easily get 25 mpg stock highway where it s a lot lighter and in my opinion more aerodynamic. Also city driving would be improved. I would think gm woulda done that top just to be able to say there truck gets way better mpg than the competition. Screw you gm.

 

Vvt :gd:

 

The better question is why not the six speed auto and a six speed manual.

My 02 Z28 with an LS1 and T-56 six speed was a quick car, and it got 29 mpg on the highway! I realize the Colorado is not as aerodynamic, but with a 5.3 and a deep double overdrive I think 25+ mpg would be no problem at all.

With the six speed auto, the truck could get away with taller (numerically lower) gears to keep the revs down at speed.

I guess the bottom line is GM just didn't have the interest in our trucks that we do...

 

I think it was a cost saving measure, honestly.

If they'd put the 6-speed in, and the Active Fuel Management, I suspect the Colorados would have cost the same as the Silverados.

I would love to eventually do a 6-speed swap, cpwire on this forum has done it a couple of times and has a shop over near Tampa . The final OD on the 6-speed isn't that much lower than the one on ours, if I remember correctly, but first gear is a lot shorter, so you could use a higher ratio gear in the diff. Not sure if it can be done with a 4x4, though, which would be disappointing.

Maybe after I pay this thing off.

 

To put afm our dod in it would be stupid expensive cause you need to tear the top end apart and switch it out.

 

Not to mention the wiring for the solenoids and computer work required.

 

6 speed and dod woulda been real nice! I'm sure the tranny and dod are more expensive but then again how much more do you think it would really cost gm to do it..just sayin

 

Just doing more thinking, it might not be worth it for most people. The AFM cam isn't very tolerant to performance modifications, a lot of shops during my research phase told me that if I wasn't hard set on AFM to dump it, because they can apparently do some pretty awesome things with VVT, just not the combination of VVT and AFM. While someone could probably collect the engine parts for ~250-500 dollars or just buy a remaned LMG/LC9 in the event their LH9 bites the dust, they still would be dropping close to a grand on the harness and programming. Just seems like a lot of money for the promise of a couple of MPGs.

 

This is all true, but lets face it, we don't mod our projects for truly rational reasons. And few mods really provide any financial gain.

I'm pretty happy with the 18.9 mpg I have gotten with my V-8, but I cannot help but wonder what a 6 speed manual would net. My 02 Z28 (5.7 LS1 / T56) got 29 mpg and made more power. Granted it was more aerodynamic and lighter. But I would think just the deeper overdrive would net high 20s on the Colorado. If you added in some more trickery like DOD or AFM who knows. It would be pretty cool to knock down 30 mpg and still have a quick little truck!

 

Six speed autos are nice. But the manual T-56 six speed has even deeper over-dirve.

T-56 Transmission Specifications
Gear ratios:
2.66:1 first, 1.78:1 second, 1.30:1 third, 1.00:1 fourth, .74:1 fifth, .50:1 sixth
and 3.28:1 reverse.

 

I did consider the T-56 for a brief moment, but I've only heard rumors of some be connverted to 4wd and didn't hear good things about how long they lasted in such an application. You can get the same results with the 6l80e but would have to match the transmission well with a good rear-end gear. The 2nd in the 6l80e is the 1st gear in a T-56, a proper choice in rear end gear would still get you the down low grunt with the deeper overdrive. However, in some applications, the lower RPM isn't always better.

 

My Dad has the 6l80e with the 6.0 and has 3.73 gears. He gets about 14-18mpg in a 2500hd. That bastard gets up and goes. But afm isn't worth the bother. Just get a deeper overdrive and run the 3.42 gears. You have to change out the whole valvetrain damn near. New lifters and pushrods change the engine valley cover. I also believe there is a special oil pump underneath the valley cover. Plus the wiring and different computer needed.

 

I get 22-24mpg on the tpk with the cruise set at 68 mph. I put the stock air filter back in
the K&N filter drops 1-2 mpg. I am going to check my long distance mpg when i go
to the Super meet next week.

 

So.... does the LFX Engine (2015-2016 Colorado trucks) have AFM?

I just bought a 2016 Colorado with the 3.6L LFX Engine and I'm pretty sure it does not because it never acts as though 3 cylinders are being deactivated like I could feel on my 2011 Silverado 5.3L that does have AFM (I have disabled that on the Silverado)

 

My new-to-me truck is a WT model so from what I'm seeing this truck does not actually have AFM

 

Found out 2015 and 2016 Colorado 3.6L engines do not have AFM.