Diablo sport predator transmission tuning.

[NWRQC]

I posted this over on their forum, but I thought that I would give it a shot here. Maybe somone can shed some light.

Diablo Predator U7137 2005 ram 1500 Hemi.

I am in the process of trying to figure out the best transmission shift points for my driving style and liking. I understand the upshift settings and have adusted them a little. The problem that I am having is understanding the downshift portion. I'm sure it's probably as easy to understand as the upshift, but I cant quite grasp it, so I am hoping that someone here can give me a hand. I found some settings online to use as a starting point and have made some adjustments to suite me.
(percentages are not the same as what the predator allows me to adjust on my truck, but close)
Upshift:
1-2 20% 1700rpm
1-2 30% 2600rpm
1-2 60% 5051rpm
1-2 80% 5351rpm
2-3 15% 1526rpm
2-3 25% 1803rpm
above raised slightly from stock
2-3 60%, 80% stock.
I am still adjusting slightly to suit my liking.... I'm good there.
Here is my confusion...Downshifts. The first RPM numbers are what the DSP displays when I click on the shift setting (i.e 2-1 @ 5%) and the second set of RPM numbers are what I found online that someone else uses (a starting point for which I was going to use).
Downshifts: stock custom
2-1 5% unsure ....... 1325rpm
2-1 80% 1503rpm .....4100rpm
3-2 45% 1603rpm ......4750rpm
3-2 55% 3000rpm ......4750rpm
3-2 75% 5150rpm .......5250rpm

So if I want the transmission to shift down a little sooner, do I adjust the first set of numbers up or down? The "online" numbers seem out of proportion compared to the stock numbers.
Right now my truck feels like it should drop down to second but holds third gear so it feels sluggish.
As an example, I was driving down the road and slowed down to make a turn on a cross street. As I turn and accelerate (say 30% throttle) the truck stays in 3rd gear instead of dropping down to 2nd. The RPM are low(say 1400rpm) so the truck feels sluggish until they get up around 1800rpm. Would I have to adjust the downshift RPM up or down.
Maybe I am searching the wrong terms, but I am finding very little on this topic (on this site and others) so any help is appreciated.
Thanks

 

[truckin151]

The down shifts being displayed are the stock down shift points. The goal with the down shifts is to not have them contradict the up shifts.

Here is where I started with mine

These are the numbers I started with and slightly adjusted them from there by about 100rpms
Downshifts
2-1 at 5% 1325
2-1 at 80% 3000
3-2 at 45% 4100
3-2 at 55% 4750
3-2 at 75% 5250

Upshifts
1-2 20% 1827
1-2 30% 2791
1-2 60% 5051
1-2 80% 5350
2-3 15% 1700
2-3 25% 2100
2-3 60% 5290 Stock
2-3 80% 5450 Stock

WOT Shifts
1-2 5830
2-3 5750

Rev Limiter
6100


I have since adjusted them and tweaked them here and there (about 50rpm at a time) to get them to my liking, been a lot of trying this and that my note book has gone through 10 pages of revisions, jotting down what I liked and didnt like about the shift and where it was or not.

I need to completely ditch them now and go with a custom trans tune, was going to do it a few months ago but the laptop died on me. Need to get a full tune written for the pcm as well since I need to update the thing before I can go in and get it tuned right. Should add quite a bit of pep to things if it doesnt blow up in the process lol

 

[NWRQC]

Thank you.
I did read about not having the downshift contradict the upshifts.
I think that it might have been your settings that I started with. My upshifts are slightly lower than what you posted as a starting point.
I guess my concern was the downshifts you posted are 1500-2500rpm higher than stock. What affect does that have on driving? Does it take less throttle for the transmission to downshift? I plan to tweek my upshifts a little more this weekend and would like to work on the downshifts at the same time, but I just wanted a little better understanding before I dive in.

 

[truckin151]

My shifts are practically seamless with those settings, up and down. I have since raised the upshifts by 100-150rpm and raised the downshifts by around 50-75rpm and its a little more "hotrod" feeling now which is what I wanted.

 

[truckin151]

Also, if you notice, the settings you input into the dsp through the user settings does not stick, as you adjust them more and more the adjust slightly from your input, most of the time they are a little lower than the original ones you entered.

 

[NWRQC]

Perfect.
Since my upshifts are about 100-150rpm lower than the ones you posted I think that I will do the same to the downshifts you posted and see how that works, and adjust from there.
I have noticed that they do differ slightly from what I input into the tuner as well.
I was looking at post on here pertaining to the SC and up/down shift conflicting.
http://www.ramforum.com/f86/superchips-transmission-tuning-information-1097/

Do you know if there is a way to log or plot this on a graph using the DSP?

 

[KGBIGCOUNTRY]

Ryan I will have to try your setting with the my DSP if the tuner dosent do it the night we take it out to finish up tuning.

 

[truckin151]

Dont think you can, the up/down shifts are for the 05-06's unless they changed the 04's

 

[truckin151]

Perfect.
Since my upshifts are about 100-150rpm lower than the ones you posted I think that I will do the same to the downshifts you posted and see how that works, and adjust from there.
I have noticed that they do differ slightly from what I input into the tuner as well.
I was looking at post on here pertaining to the SC and up/down shift conflicting.
http://www.ramforum.com/f86/superchips-transmission-tuning-information-1097/

Do you know if there is a way to log or plot this on a graph using the DSP?

NOt on the 05's, I believe the 06+ will allow you to log shift points because of the CANBUS (I think thats what its called) and we do not.

 

[KGBIGCOUNTRY]

DSP was supporting the 04 trans also I believe. The newer Crom should let me know when we plug into it, if not oh well its just an added perk. Gonna have to learn a new tuning system all over again.

 

[NWRQC]

NOt on the 05's, I believe the 06+ will allow you to log shift points because of the CANBUS (I think thats what its called) and we do not.

Thats a bummer.

 

[truckin151]

I really need to get in contact with the guy that was going to do my trans tune and get that worked out, should make for a FUN ride

 

[NWRQC]

The down shifts being displayed are the stock down shift points. The goal with the down shifts is to not have them contradict the up shifts.

Here is where I started with mine

These are the numbers I started with and slightly adjusted them from there by about 100rpms
Downshifts
2-1 at 5% 1325
2-1 at 80% 3000
3-2 at 45% 4100
3-2 at 55% 4750
3-2 at 75% 5250

Upshifts
1-2 20% 1827
1-2 30% 2791
1-2 60% 5051
1-2 80% 5350
2-3 15% 1700
2-3 25% 2100
2-3 60% 5290 Stock
2-3 80% 5450 Stock

WOT Shifts
1-2 5830
2-3 5750

Rev Limiter
6100


I have since adjusted them and tweaked them here and there (about 50rpm at a time) to get them to my liking, been a lot of trying this and that my note book has gone through 10 pages of revisions, jotting down what I liked and didnt like about the shift and where it was or not.

I need to completely ditch them now and go with a custom trans tune, was going to do it a few months ago but the laptop died on me. Need to get a full tune written for the pcm as well since I need to update the thing before I can go in and get it tuned right. Should add quite a bit of pep to things if it doesnt blow up in the process lol

Well I decided to make some adjustments earlier. I raised my upshifts 1-2 by about 80rpm and 2-3rd by about 40rpm from where I had it set before (about 100-150rpm lower than above). I set all my downshifts about 400rpm lower than what you posted. Driving the truck now feels a lot better now, much smoother. I plan to fill up with 91 octane this weekend and change to the 91 tune. Along with that I think I will tweek the downshifts a little more. So far I am a happy with the results, Thanks I will report back after I dial it in a little more.

 

[truckin151]

Cool, as long as it is working at all shifts and you have ran it through its paces and all feels right you should be good. I ran the above shifts for well over a year before tweaking them and have been running my new shifts since so its been at least 3yrs or so with the shifts and running smooth. Just monitor, log and adjustand repeat until you are comfortable with them and then keep monitoring.

 

[hemi04]

don't believe my 04 had it when we looked for it in the tune. Really wish i could, unless i go with the fully adjustable transmission control from one our guys. ~But im getting the truck on the market for sale soon

 

[hawk02]

So DS now has trans tuning like SC? I was think of trying DS but I really like the SC trans tuning. How much can you adjust without getting custom tuning for the trans, ie; TQ management, wot shifts, rev limiter etc. Thanks for any info, it does seem like their engine tuning is more aggressive than SC, which sounds good to me.

 

[truckin151]

Sc has the better user based trans tuning, dsp has the better engine tuning and better custom tuning. For an 05 you can do rev limiter, speed limiter, wot 1-2 & 2-3, part throttle up shifts 1-2, 2-3 and part throttle down shifts 3-2 & 2-1.

The custom tuning though there is a whole mess of options you can change which will make it run much much better

 

[hawk02]

What can the rev limiter go too and can you reduce the TQ management? Or is it a set amount that the tune reduces it? How are the shifts/ firm-fast? Sorry for all the questions I just want to be sure on everything before I decide on the switch, Thanks! I also noticed that they have the throttle sensitivity settings for throttle by wire, can this be adjusted on our rams?

 

[NWRQC]

I am not sure on the TQ management, but you can adjust the throttle sensitivity.

 

[truckin151]

What can the rev limiter go too and can you reduce the TQ management? Or is it a set amount that the tune reduces it? How are the shifts/ firm-fast? Sorry for all the questions I just want to be sure on everything before I decide on the switch, Thanks! I also noticed that they have the throttle sensitivity settings for throttle by wire, can this be adjusted on our rams?

No TQ management user tools, the tune reduces it back real low though. Rev limiter can go up to 7000rpm, your WOT shift points though will only go to 6200rpm without it custom tuned. Shifts are firm and quick but not as firm or quick as the SC (add in a sonnax and you are golden though). If you go with a custom tune, you can reduce the TM and raise the line pressure for different shifts also set the TQ converter lock up settings, raise the WOT shift points so you can have a 6600rpm shift in DRIVE instead of manual shifting. and that just cracks the surface of it. This is where I am heading with mine