transmission temp to cool?

[SuperNova]

Re: transmission temp to cool?

I know--I'm just saying don't think you have a Super-truck all of a sudden--for the most part the aftermarket reprogrammers do more harm than good. They make the vehicle perform better, no doubt, but at what price in the long run? The factory engineers put a lot of time and thought into their strategies and they have to survive at least through warranty. The aftermarket guys don't care if your truck lasts 30,000 miles or 3000 miles--you already bought all they had to sell. And it's not like the programmer itself is going to fail, cause it's pretty much a once and done kind of thing; even if it does fail, the hardware isn't the expensive part of the package. I know if your truck comes in to us and it's had any sort of programmer hooked up to it--your warranty is over, and the vehicle is placed on restriction. That's not our policy--it's Chrysler's and Cummin's.
--
Stan

 

[dolluper]

Re: transmission temp to cool?

Line pressure is controlled by the pump {vaned or geared} and the governor,these chips don't control that!!! They change the parimaters of shift sensors,tps parimaters,etc but no line pressure in the trannie

 

[SuperNova]

Re: transmission temp to cool?

Line pressure is controlled by the pump {vaned or geared} and the governor,these chips don't control that!!! They change the parimaters of shift sensors,tps parimaters,etc but no line pressure in the trannie

That is incorrect---line pressure is controlled by a solenoid and regulator valve. Pump pressure is just that--pump pressure and it is the highest pressure in the trans--it is stepped down to the various working pressures such as governor pressure and line pressure, etc. by regulatory valves which are contolled by solenoids which are controlled by--you guessed it!- the PCM or TCM as the case may be on that particular vehicle.

I've never heard pressure switches called "shift sensors" before, but they are just on/off switches and I have no idea how you could "change the parameters" of them since there are no "parameters".

These controllers do two things from a trans standpoint---they modify the governor output to raise shift points and they modify line pressure solenoid input to raise line pressure--thereby increasing shift speed and firmness.

 

[SuperNova]

Re: transmission temp to cool?

Duplicate

 

[dolluper]

Re: transmission temp to cool?

Great explaination but I was talking inside the box {computer}The term shift sensor was I believe invented by Kenny Bernstein a pioneer of chips and computer's in the early 80's,I guess I should have shift senseing circuit instead Believe me I do love to talk on this subject as it is great information for others that are learning and want to learn So all your inputs and corrections have been great there Super

 

[SuperNova]

Re: transmission temp to cool?

The term shift sensor was I believe invented by Kenny Bernstein a pioneer of chips and computer's in the early 80's

Didn't he do pretty well drag-racing, too??

 

[dolluper]

Re: transmission temp to cool?

Most diffently,had the pleasure of meeting him in 83 in Ocla Flordia at Don's place about the time Don opened the drag racing muesum,they were trying to crack the 300 MPH quarter then in Gannisville {Gatornationals}HE was a real nice smart guy,not to say Garlites wasn't sharp ,Don had a real nice shop in behind the museum,which a spent a couple of days roaming around at

 

[bruceb58]

Re: transmission temp to cool?

Stan
The hypertech programmer does not allow me to fine tune anything on the truck. It simply asks a series of questions about tire size,gear ratios,fuel octane used, transmission shift firmness ect. By answering the questions it then reprograms the trucks computer.When programming is complete the Hypertech unit is unhooked from the trucks computer port.The unit cannot be turned on and off either the truck is running the hypertech program or it is running the factory GMC program.

I would never use one of these programmers on any vehicle that I owned. I am an electrical engineer and used to work for Delco Electronics for awhile. While I was at the GM proving grounds in Arizona, I was able to speak with an engineer who worked on the ECM software for the big block motor used in full sized pick ups. He told me that there was absolutely no way that a person outside of the company could select all the correct parameters to make the vehicle run as well as they could do it. While admitting that there were certain paramaters that could be changed to increase power, without knowing all the paramters and how they inter-relate to eachother, a person outside of his group wouldn't know how changing one paramater would cause the need to change other parameters.

 

[reelfishin]

Re: transmission temp to cool?

I would never use one of these programmers on any vehicle that I owned. I am an electrical engineer and used to work for Delco Electronics for awhile. While I was at the GM proving grounds in Arizona, I was able to speak with an engineer who worked on the ECM software for the big block motor used in full sized pick ups. He told me that there was absolutely no way that a person outside of the company could select all the correct parameters to make the vehicle run as well as they could do it. While admitting that there were certain parameters that could be changed to increase power, without knowing all the parameters and how they inter-relate to each other, a person outside of his group wouldn't know how changing one parameter would cause the need to change other parameters.

Every one of those "reprogrammers" or the add on computer chips I've ever seen seem to all add a big 'seat of the pants' power change, but they all have a weak point somewhere, it seems that no matter what you gain in one area, you lose something somewhere else.

I am a firm believer that if the original engineers of a vehicle thought that they could add a few horses or some performance and not detract from the overall package, it would be done. With all the competition in the truck market these days, it's not likely they would hold back horsepower or performance.
Other factors such as driveline wear or failure, engine or trans temp, or longevity are all taken into consideration when a vehicle is designed.

I do believe that a trans can be more purpose built if the owner doesn't mind a change in drivability or shift feel. On some of the newer electric shift transmissions it's possible to turn up the line pressure slightly and improve shift feel slightly, but overdoing this would lead to failure or breakage.

Usually the right answer is that if the current set up isn't working for you, chances are you need a heavier vehicle. But if someone just want to firm up the shift a bit for light or occasional towing its usually doable. A lot of how a trans holds up while towing is also driver habit and know how. If you take your time and don't push it, you would be surprised how well some of the smaller transmissions will hold up, but a lead foot driver can destroy even the best trans while towing a heavy load. If most people would just take their time and let the vehicle move the load at its comfortable pace, they could reduce nearly all excessive wear and tear usually caused by towing.