I will quote the below piece directly from a Dinan brochure:
"Faster acceleration is the driving enthusiast's typical goal, however many drivers often overlook driveline enhancements in favor of a focus on increased horsepower. While both will make the cars faster, further improvement in acceleration can be achieved through torque multiplication, effectively delivering as much as a 10% increase in torque directly to the rear wheels. Dinan offers replacement differentials featuring shorter final drive rations, lightweight clutch assemblies, as well as performance automatic transmission software, each making the driveline more efficient in order to take full advantage of the engine's new found power (from the engine tuning chip) for even faster acceleration."
My question is this, with the automatic transmission software is this a stand alone or do you need to modify the differentials as well? The write up sounds like it is an either or depending on standard or automatic trany.
Secondly, with the tuning chip available from Dinan, I thought that it remapped your automatic shift points. What say you?
Here is a link for you 318i heads looking for performance improvements:
I'm surprised with all the experience here, no one can comment on the Dinan auto trans chip upgrade, surly one person here has had it done. I don't mind the power on a 318i once the speed is over aroun 30 MPH, but below that its pathetic. I'm thinking that with a remapping of the tranny there might be more grunt at the lower end. I just Dinan'd my 528i and it did develop more lower end grunt.
I am pretty sure if you do a search you will find the info that you are looking for. I drive a 5spd so I really have not done much research on the auto tranny chip. However, I do not see how just the auto tranny chip would make any differance by it's self, with the exception of possible faster shifting time, different shifting points, and more aggressive downshifting. But all of that can be taken care of by the A/M button. I also do not see how the software could make a difference in efficency. You are still going to lose the same amount of power to the drive line, rpms are still going to raise as quickly because you are not adding power or taking away friction. Basically I think it is a bad mod by its self. I'm sure if you have put a lot of money into the car with a chip, cai, throttle body, fuel injectors, ect. then this might be a worthwhile mod, in my mind. Basically I would recommened saving your money for the reasons I listed above. But keep in mind I have a 5spd and have had no real reason to research the auto-tranny chip, but those are the doubts that are put into my mind with what I have heard/read about the chip. Hope it helps. Do a search. Good luck.
The software for auto trannies makes the "transition" from gear to gear faster and "snappier" instead of slow and more luxurious. Also shift points are raised higher. Your gas mileage will go down because of this.
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As software generally is, I see this as a finishing touch not a starting point. Soft ware is a means of taking advantage of other enhancements you've made. Tranny chips seem like something you would do after building the car, not as a means to do so.
jllphan, you might be making a good point. I have the Dinan brochure for Bimmers and perhaps they are assuming you use the tranny upgrade along with their cold air increase, power chip, fuller throttle body, and better exhaust. The software upgrade in my 528i did remap the tranny and it does have better lower end pull. My 2002 330xi just about leaps when you touch on the accelerator and I like lower end pull this car has. When I sharked the 528i, it did "sort of" leap like the 330xi; there was a definite improvement.
Because of the high revs needed on the 318i to get power, like I said, for me power above 30 MPH isn't too bad - not great but not as bad as people make out. The word "acceleration" can't be used on the car from 0 to about 20, I think a kid on a bike would out accelerate the 318i from a standing start.
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