McLaren2876 Posted February 23, 2020 Share Posted February 23, 2020 12 speed vs 6speed transmission for scania and other trucks in terms of with trailer and without trailer.Which transmission gives best acceleration and in gear acceleration without trailer and with trailer.What are the pros and cons of both transmission. Link to comment Share on other sites More sharing options...
AxeRider Posted February 24, 2020 Share Posted February 24, 2020 Hello, There are many factors affecting acceleration such as horsepower, torque, rpm output of the engine, stroke times in the combustion chamber, gear ratios, differential ratio, etc. However, assuming that all other variables are constant except the transmission, a vehicle with 6-speed transmission usually accelerates better than 12-speed transmission. The first thing to consider is the first gear ratio. This ratio states the number of revolutions that the engine needs to make for the transmission (while in the 1st gear) to complete one revolution. Then, there is the differential ratio. This ratio states the number of revolutions that the transmission needs to make for the wheels to complete one revolution. If you multiply these two numbers, you get the number of revolutions that the engine needs to make for the wheels to complete one revolution. That may sound a little complicated but let's see an example: Here is a 6-speed transmission for Renault T from ETS2: https://ibb.co/H7p0mKr Here is a 12-speed transmission for Renault T from ETS2: https://ibb.co/Rg4syVh For the 6-speed transmission: (first gear ratio) x (differential ratio) = 4,70 x 3,91 = 18,38. This means that, to turn the wheels once, engine has to make 18,38 revolutions while the transmission is in the 1st gear. For the 12-speed transmission: (first gear ratio) x (differential ratio) = 11,73 x 3,08 = 36,13. This means that to turn the wheels once, engine has to make 36,13 revolutions while the transmission is in the 1st gear. In conclusion, assuming all the engine specifications are the same, 6-speed transmission is superior to 12-speed transmission in terms of acceleration. However, the opposite is usually true when it comes to the discussion of top speed. Hope this helps Best regards Onat Link to comment Share on other sites More sharing options...
LordBenji Posted February 24, 2020 Share Posted February 24, 2020 I've done some testing before and a 12 speed will reach 90 km/h in about 12 seconds, while the 6 speed will reach the same speed in about 8 seconds. That's all with the same truck and engine. I've also done some testing with 10 tons cargo (1 axle trailer) and 26 tons too. The 10 tons do 19 seconds for 6 speed vs 25 seconds for 12 speed. For 26 tons, it's 34 seconds for 6 speed and 38-39 seconds for the 12 speed. But do note that those tests were done on a relatively flat road with no incline. The 6 speed will struggle with heavier loads on a steeper incline. I think the difference comes from the starting gear ratio, and how many times the truck will shift. Link to comment Share on other sites More sharing options...
McLaren2876 Posted February 24, 2020 Author Share Posted February 24, 2020 Thanks guys for helping me. Link to comment Share on other sites More sharing options...
Patrik322 Posted March 9, 2020 Share Posted March 9, 2020 Hello, Due to this topic has been inactive for 14 days, I am going to archive it to keep our forum organized. Best Regards, Patriktanki TruckersMP Communuty Moderator & Translator //Locked & Moved to Archive Link to comment Share on other sites More sharing options...
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