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Hypertech Tuner Installed Today = No More AFM!!!!!

GRN69CHV

By GRN69CHV
in Modifications & Accessories

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bronco2977 Enthusiast

bronco2977

Posted
Posted

I've been thinking about a tuner a lot lately. I have 3.42 gears and still want a tune. Good info, thanks. Think I'm about to purchase the same Hypertech.

chevy2tuff2006 Enthusiast

chevy2tuff2006

Posted
Posted

Responded to a post earlier today talking about this same topic. Have been considering this for a while. Ran out to pick up oil for the tractor today, sure enough Auto store I went to had Hypertech Max Energy #32501 marked down 25% (last one) to $247.00. Checked on-line real quick, this had all the features I wanted, so took it. Installed the prepackaged premium fuel tune, increased trans shift points by 50%, adjusted tire size to 32" for the new shoes and the biggie, turned off AFM. Why did I wait so long to disable AFM. Truck was low on fuel so filled it up with 93 octane, then took it on a 20 mile drive. Even with the crappy 3.08 gears, difference in 6th gear at lower speeds (ie 45 mph and below) when running in V8 mode ( as compared to having it try to run in 6th gear and V4 mode and not do either well) is night and day. There is the option to set a minimum MPH to enable AFM (say 60 mph), but I'd just as soon keep it firing on all 8 cylinders all the time. If I can average 16 mpg in daily rural driving and just touch on 20 mpg highway I will be happy.

 

How is the sluggish acceleration when you turn corners? Does it feel like your in the right gear and doesn't seem like it needs to down shift when you come out of the turn?

GRN69CHV Enthusiast

GRN69CHV

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How is the sluggish acceleration when you turn corners? Does it feel like your in the right gear and doesn't seem like it needs to down shift when you come out of the turn?

That hasn't changed, I think the tuner focuses on upper part of the power band. With exception of disabling AFM, everything seems to be a change at WOT. Light throttle situation you are describing may be torque management or a change in throttle position. For me, it's a non-issue, I just give it a little more throttle to kick it down into a lower gear. It does seem to be smoother making the transition, only reason I could account for this perception is due to not having the AFM. I know it's supposed to be instantaneous transition from V4 to V8, but I can't help but think the motor has to be running at a higher volumetric efficiency even at low load if firing on all 8 cylinders.

 

Something else I noticed. Trans is not trying to drop into 6th gear at very low speeds. Wish I would have documented it, prior, when had AFM enabled, it would try to run in 6th and V4 mode at very low mph, often trying to run down the road in 6th gear at about 1000 rpm. Hadn't paid attention to this since the uploading the tune, but realized it was running at about 1200 rpm +/- at about 45 mph - which is 5th gear. It does shift into 6th at about 50 mph.

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