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Range D.F.M. disabler

Jac365
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Bob Ross
Bob Ross

There are plenty of threads on this but for me I paid for a V8 and I want a V8. Besides the fact that AFM was plagued with lifter failures and oil consumption issues. The people who had their engine i

Stephen L. Pannell
Stephen L. Pannell

So I went ahead and picked up one from Summit Racing near me and plugged it in. Started and drove about 30 miles and so far it's working like it should. V8 sound all the time. With the Borla catback e

JohnTz
JohnTz

Ok thanks for the explanation. I guess I knew that it had DFM when I purchased it so I knew it was a V8 that has advanced cylinder fuel management so it doesn’t bother me and it equals better fuel mil

Ratchetarms Enthusiast

Ratchetarms

Posted
Posted

I just ordered and received a Range DFM disabler for my 2019 5.3.  While the unit seemed to function ok, I wanted to share something it did that I did not like.  I am by no means bad mouthing the company or product, but I believe that the fact it disables DFCO (deceleration fuel cut off),  should be revealed on their website.  This was a deal breaker for me.  I drive over the continental divide twice a day.  I plugged in the unit and headed up to the divide. Upon heading down the other side, I was constantly on my brakes, even on smaller hills and in 5th gear at 3000 RPM. I promptly unplugged it, and immediately began slowing down, even in 8th gear.  I can,t imagine using this in the mountains with a trailer.   I decided to send it back,as this was unacceptable to me.  I also noticed deceleration mileage was around 40 to 50 mpg, instead of maxed out at 99 mpg.  It actually felt like it was giving it a little bit of throttle.

 

I was curious  if the Range Pulsar LT does this as well.  I'm guessing it probably does.  If anyone knows for sure, please comment. 

dgstarr63 Enthusiast

dgstarr63

Posted
Posted

I had the Range on my 2015 5.3, 6 speed, AFM, worked great. I now have a 2021 5.3, 8 speed with DFM. I sent the Range to the manufacturer and they modified it for the new truck. It also works great. I have not experienced the rough shifts since the dealer replaced the valve body.  I don't think the Range effects the shifts. I think the mileage is a little lower, but there is nothing else negative that I have noticed. 

Ratchetarms Enthusiast

Ratchetarms

Posted
Posted

Do you still have fuel cut off when decelerating? That is my complaint.  It had absolutely no engine braking. Even at 3000 rpm. I sent it back.  I only ran it 15 miles.  No strange shifting and it did keep the dfm from kicking in?

GSC52 New Member

GSC52

Posted
Posted

I plugged mine in for a few weeks after getting it.  Worked as should, but after unplugging, the auto/start feature is still disabled.  Has anyone ever seen that behavior?  2019 5.3L with 8 speed.

Ratchetarms Enthusiast

Ratchetarms

Posted
Posted
31 minutes ago, brewtus said:

Have you confirmed with RANGE that is how the Pulsar is supposed to function - no engine braking?

No, I didn't. I bought it off of Amazon and just returned. I thought about contacting them, but choose just to return it.

mwlewis558 Enthusiast

mwlewis558

Posted
Posted
On 3/16/2022 at 3:04 PM, GSC52 said:

I plugged mine in for a few weeks after getting it.  Worked as should, but after unplugging, the auto/start feature is still disabled.  Has anyone ever seen that behavior?  2019 5.3L with 8 speed.

I haven't had this issue but I have noticed if I leave the unit plugged in and after a few trips I'll come to a stop and the auto start/stop will be activated. I just unplug the unit and plug it back in and its fixed. 

  • 3 weeks later...
xtrythis1 Enthusiast

xtrythis1

Posted
Posted

I got a Range DFM disabler for my 2020 5.3L 8 speed. I noticed when i first start the truck it always chooses to use DFM for the first few miles including fuel cut off (99mpg) while on decel and then magically turns it off so it engages at random and i have no control over it. Does not do auto start/stop though.. Does anyone else have this problem? Do y'all unplug it safter every drive then plug it in when you drive again? After about 5 to 10 min it'll kick in and start working. I think the worst time to use DFM is when the engine is cold and that's why it drives me nuts and i end up putting it in L7 until the engine is up to temp then go into D... 

ESierra Enthusiast

ESierra

Posted
Posted

I wonder if they'll ever release a DFM delete for the 2.7 L3B. Since apparently it does deactivate cylinders even in a 4 banger. 

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