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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #161  
Old 06-11-2012, 03:48 PM
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Don't see how the tuner could make it not adapt, but as long as you're happy with it

Are you guys with diablo's not able to monitor line pressures? I can monitor desired and actual LP's with the SC...
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  #162  
Old 06-11-2012, 04:05 PM
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I don't know what the DS does as far as trans tuning, but it appears that it has a preset trans tune that does not adapt. Driving style does not appear to change the way it shifts. I have no doubt that it still has the slip detection and will alter the pressure if needed to ensure no slippage, but it does not appear to reduce pressure to 'smooth' the shifts like the OEM tune does.

If the DS is capable of monitoring the pressure, I am not aware of where in the unit to do that, but even if it does, it will be taking this from the sensors that will not likely read the altered pressure of the Sonnax unit so I would like to install a mechanical gauge to read the actual.

It is unfortunate that we can't get the full low-down of what is being done in the PCM and other module.....and what the tuners are actually doing. Not that it would make a big difference, but that like tidbit of information would reduce the amount of speculation and unknowns.

I think I can safely assume that Chrysler and the tuner companies are not willing to release their source code which is what would be needed to really tell what is happening.
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  #163  
Old 06-11-2012, 04:50 PM
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Quote:
Unless you have a pre-2011 and are using a tuner. Then the sonnax makes a notable difference.
This is exactly the same experience that I have. It does not seem to return to standard pressures...what ever they are. Maybe it's the tuner...but after 1,000 miles and lots of standard driving, there is still a noticeable firmness that is just not there without the booster.
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  #164  
Old 06-11-2012, 04:54 PM
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I just wonder if what you guys are feeling is the effects of the tuner, and not the line booster. There is a big difference in shift firmness with my SC vs. stock. Reduced TM and shorter shift duration make it feel firmer.
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  #165  
Old 06-11-2012, 05:25 PM
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Quote:
Originally Posted by brad12kx View Post
With my DS tune, the Sonnax is both noticeable and the shifts don't seem to 'adapt' as they do without it. Even if I granny drive for awhile, they stay firm. Without the tune the PCM appears to adapt to the Sonnax and reduces the pressure.

I am hoping to hook up an actual pressure gauge to monitor what is going on, but for now I'm very pleased with the combination of DS tune and Sonnax. The shifts are firm enough to chirp the tires on both the 1-2 and 2-3 shifts on hot pavement under WOT. Without the Sonnax, that never happens.
I didn't think the DS had any trans options, only the SC. Do you have a custom tune? I wander if DS does do something with the trans with just the canned tunes that they just don't mention.
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  #166  
Old 06-11-2012, 05:27 PM
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I know others have mentioned it alters TCC engagement as well. I think all of this is speculation, and nobody really knows other than the guys at Diablo.
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  #167  
Old 06-11-2012, 07:21 PM
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Quote:
Originally Posted by snrusnak View Post
Don't see how the tuner could make it not adapt, but as long as you're happy with it

Are you guys with diablo's not able to monitor line pressures? I can monitor desired and actual LP's with the SC...
What is the highest line pressure you have seen WOT? I have an actual mechanical gauge on my trans, so I am interested in what SC is showing. Thanks.
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  #168  
Old 06-11-2012, 09:33 PM
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Quote:
What is the highest line pressure you have seen WOT? I have an actual mechanical gauge on my trans, so I am interested in what SC is showing. Thanks.
Let me hook it up and see, I haven't had it plugged in for quite some time. Give me a few days and I'll let you know. I want to say it was like 100-120psi but that might not be right...
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  #169  
Old 06-11-2012, 11:50 PM
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Quote:
Originally Posted by snrusnak View Post
I just wonder if what you guys are feeling is the effects of the tuner, and not the line booster. There is a big difference in shift firmness with my SC vs. stock. Reduced TM and shorter shift duration make it feel firmer.
I have tried mine both with and with the Sonnax; stock and DS 91 performance tune. Just installing the DS tune makes a difference in the shift firmness that appears to be persistent. Adding the Sonnax increases the firmness and appears to be persistent as well.

When I run factory tune, the shifts are definitely smooth. So smooth that often you can't feel the shift, but rather feel the difference in engine RPM. When the Sonnax is installed, the shifts firm up, but that is only temporary in my experience. As Transengineer pointed out, the PCM will adapt and lower the pressure to smooth the shifts, and that is exactly my experience.

However, with the DS tune installed, I don't seem to gets these same stock adaptation results. The shift firmness stays regardless of how I drive, and the Sonnax firms it even more.

That is why I would like to install a pressure gauge to see exactly what is taking place. For now, I just enjoy the feel of a 'performance' shift each and every time. This also does not change if I reboot the system. Personally I really like the consistency of the shifts with the tuner installed, and the extra firm feel with the Sonnax installed.

Quote:
Originally Posted by storeboy View Post
I didn't think the DS had any trans options, only the SC. Do you have a custom tune? I wander if DS does do something with the trans with just the canned tunes that they just don't mention.
Nope. Canned DS 91oct performance tune. I was of the impression that DS did nothing with the trans, but after switching back and forth between stock and the DS 91 canned tune many times, I notice the difference in how it shifts so at this time am quite confident that DS does do something with the trans. I do know that if I dump the DS tune AND remove the Sonnax at the same time, the shifts are so incredibly bad that I could swear the trans was shot. It sorts itself out in very short order, but the first few shifts are pure mush. LOL If I have the trailer in tow when I do this, I get P073X codes which I believe indicate slippage in the trans. I will usually cut the throttle on me when this happens. Usually adapts enough in 3-5 shifts to stop throwing codes, but takes a few acceleration cycles from a stop to fully adapt to where it's completely drivable. If I reboot the system after removal, I do not experience these same symptoms. It's just it's normal smooth car-like shifts.
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  #170  
Old 06-12-2012, 09:16 AM
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Here you go.

Idle in park:



Idle in gear:



Moderate acceleration(1/4-1/2 pedal):



WOT:



Sorry it's so blurry, truck was shaking a lot I guess lol. Desired LP is 160 and actual LP is in the 150's(can't make out exactly what, though).

Actual LP is always slightly less than desired for the first few seconds then quickly adjusts to the same or very close.

Normal driving/cruising it pretty much is always between 50-120.
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