After coasting (no throttle) for a few seconds in 6th gear at low speed (70-90 KpH; 45-55 MpH), I get a 1 - 2 second dead throttle lag when reapplying the throttle. I am seldom (once a week) coasting in 6th gear so it surprises me every time. It is most annoying when I need the throttle response due to city traffic. In summer 2018 it went in for warranty and I asked them to check for an updated shift program. They said there was no update.
Any ideas? Is there an after market tweek?

 

My guess is that it is simply a syncing issue.with your transmission. If you are coasting in overdrive, basically everything is turning at less than a 1;1 ratio. So, when you push on the throttle, likely that is a sec or so delayed reaction. Wondering what axle ratio you have. I would hypothesize that the a lower (number) would produce more lag.



Just a hypothesis. What the heck do I know?

 

Thanks for reply. What do you mean by "syncing" issue? This only happens in this one scenario so It always catches me off guard. My theory was that the transmission program was getting it to shift to each gear before hitting the right gear. eg: it's in 6th but my throttle pressure for that wheel speed requires 3rd, so it shifts to 5th then 4th then 3rd before it gives me throttle. I thought this because I read that the F150 10 speed has "skip a gear" shifting programmed into it. It doesnt need to hit all the gears; it can go straight to the appropriate gear for the conditions.

 

that's what I mean by syncing. So, picture yourself coasting up to the base of a hill on a 10 speed bike while in 10th gear. You hit the base of the hill and need to shift down. You have to ratchet through each gear to get to the right one, Add to that that you're in OD on the coast which means there your engine revs are at their lowest compared to your final drive and the throttle position is a zero...Said, differently, I'd call this normal operating condition. I have a PSD and will try to replicate it this afternoon.

Cheers

 

I just heard about "Pedal Commander" and watched the vids. This device seems to take out the inherant and reliable throttle lag. I assume the lag is caused by the pedal and happens every time. But my symptom happens about once a month, but always the same perameters, so it's reliable but not often. I believe mine is caused by the transmission shifting. So, is Pedal Commander going to help me?? Does anyone know?
Thanks

 

Is this with an F250/6R100, or F350/6R140? If it makes any difference on the shift strategy, IDK. Might be apples to oranges here, but when I had my 2011 6.2 with the 6R140, I didn’t like the factory shift strategy, and when running at lower speeds in traffic like you stated, I would just hit the - button and lock out 6th gear. Sometimes even lock out both 5th and 6th if conditions warranted it. A 5 star tune helped, but was not the cure all.

 

Thanks for the info. A google search of 5 star tune couldnt find their website but I found a write up on stage3motorsports.com. It only mentioned "changing shift points", but nothing more on the subject. I believe that is what Im after is changing shift programming. I need to know more before I spend $700. Im dont need more HP. And I dont want to have to lock out the top 2 gears manually every time I cycle the key switch as I do a lot of cycles each day in the city, and this symptom only comes at city driving speeds.

 

5 Star used to be on this forum in the 6.2 gas engine section. Maybe check there. But, the cheapest option for you is still going to be the +/- button I believe. I know, it is a PITA, but it works great.......better even than the 5 star tune.

 

Since my old brain sometimes I have to put some thought into something before I think about it!!!!!! LOL.
Another thing that *MAY* be an issue. these transmissions ‘learn’ your driving style and adapt to it. Just try changing the way you drive for a month or so and see what happens.