We have also compiled a short list of part numbers associated to the failing clutch & gear actuator units. We receive clutch & gear actuators for repair on a daily basis for the following vehicles: Furthermore, the replacement unit will only come with a standard 12-month warranty and being that it is such a common failing part, it doesn’t give much confidence that the problem won’t re-occur. Each actuator is coded to the vehicle and can cost upwards of £700+Vat each to replace with coding. If your clutch or gear actuator has failed, then you may already be aware of exactly how much it can cost to replace the unit. 3 Bars / Lines Appearing on Gear Change Box.Below we’ve listed the most common fault symptoms we are aware of so far: When the clutch and gear actuators fail on the Mercedes Smart car. To calculate the required gear, when the next gear change should take place and when to engage/disengage the clutch.Īs many SMART car owners are already aware, this design has many faults and can render the vehicle completely un-drivable. This information along with vehicle speed and other parameters will be used by the gearbox ECU. Which sends signals back to the gearbox ECU to determine which gear the vehicle is in or what position the clutch is in. Each of the actuators will also have position sensors. The system consists of a clutch actuator assembly, a gear shift actuator assembly, and a gearbox ECU. The vehicle does not have a clutch pedal and instead operates on sensors and ECU’s.
#Smart car transmission manual#
Which means the vehicle can be driven as a manual or automatic at the flick of a button. Yeah, it’s a backward’s step abortion of a gearbox compared to the 6 speed on the 450 and 452.The SMART car transmission is unlike any ordinary 5 or 6-speed automatic.
My remapped 450 changed gear faster than my remapped 451. So what smart have actually done is removed a gear which affect MPG when cruising at high speeds but haven’t improved the speed of the gear change to a point that can be felt. This is the same set up as the smart forfour vehicle. Plus they took a sensor out due to a improvement in gear change. The gear change is faster due to it having two motors involved in the changing gear operation. One disengages while the other engages. Keith contacted me with the following information about the 451 gearbox.
#Smart car transmission software#
The old system was controlled by the ECU, the new gearbox has a dedicated controller. Couple that with the new software and you have a gearchange that is faster than the original. The biggest complaint on the original car (450) was the slow gear change. 6 gears was reduced to 5 so a single final drive could be used and speed up the change. Just make sure you use the correct gearbox for your car. Usually it will fail as you shift between gear 3 and gear 4. The problem is that the ECU is expecting a certain speed coming out of the gearbox depending on the speed going in. If the speeds are different from expected (wrong ratios), you will get a transmission error. Just because all Suprex engine gearboxes will fit all Suprex engines, it won’t work. The fitment is different.Ī 450 gear box will fit a Roadster and vice versa but DON’T DO IT. Obviously a 451 gearbox won’t fit on a Roadster or 450 fortwo. The gearbox ratios have to match what is coded in the ECU. You can’t just mix and match smart gearboxes. It still isn’t widely known but you can’t just put a Brabus gearbox in a non Brabus smart. What happens is the car is usually happy to drive in gear 1, 2 and 3 but as it switches over to final drive 2, the gearbox speed is wrong so the ECU calls it up as a shifting fault and shows 3 bars on the speedo. Brabus 450 Gearbox In A Non Brabus 450 Smart The reverse gears are the same in all six speed gearboxes, from 599cc fortwo to Brabus Roadster.ġ.5625 (25/16) x 1.960 (49/25) x FD1.
The engine obviously doesn’t spin backward in reverse which is why it uses two cogs before the final drive to reverse the rotation. Reverse uses two gears and final drive 1. This made the gearbox smaller but slowed it down as it had to change more cogs. The Fortwo and Roadster gearbox is unlike many other gearboxes as it had two final drives.Īlthough it is a six speed gearbox, it only has three gears in it. Therefore if you take the above pre-calculated figures and divide them by the final drive ratio you will arrive at the true gear ratio for each gear in the transmission.
#Smart car transmission mod#
Mod Details Premium No Difficulty Mod ID 304 Credit Blackdog/Getrag For Link Copy to Clipboard ForTwo 450įinal Drive On The Five Speed 451 Gearboxįinal drive is the fixed ratio that sits between the gearbox and the drive shafts. All of the figures above have been calculated with final drive already.įor example, first gear of the Brabus 451 is 3.308, multiply this by the final drive ratio of 4.529.ģ.308 x 4.529 = 14.981932 which is rounded up to 14.982
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