I Really Don't Know Why But... There are some normal, intelligent smart owners out there who insist that you can use gear oil in transmissions that are designed and specified to be used with ATF. Apparently the manufacturer of the gear box don't know what's best....
Smartmods
for all your modding needs, recommended by Evilution
Engine
Gearbox Removal
Why remove the gearbox? Maybe you want to change the clutch, maybe your gearbox is fucked.
Getrag Gearbox
Who?, what? and why on earth did they do that?
Head Gasket Failure Test
Symptoms Do you have oil in your coolant? Coolant in your oil? Losing coolant? Air locks in the coolant system? Car running like a piece of shit? Good news, your head gasket might be screwed. The head gasket sits between the main block and the head. The main block...
Intercooler Fan Removal
The intercooler fan is visible over on the left side of the engine bay. Removal is fairly easy. Disconnect the electrical connector from the intercooler fan. Disconnect the throttle body electrical connection and then remove the 4x Torx E10 bolts. Undo the pipe clamps...
Intercooler Fault
The intercooler seems to rub on the scoop causing it to wear through.
Intercooler Radiator Removal
Remove the intercooler fan to gain access to the intercooler radiator. As you have already removed the upper intercooler pipe, you just have to remove the lower intercooler pipe. This runs from the right hand port of the intercooler radiator to the turbo. Just loosen...
Intercooler Scoop Removal
It's common to have a part of the lower intercooler scoop missing as they often get smashed off by stuff in the road like dead foxes and giraffes etc. The scoop is 2 parts so you can just replace the broken section if you want.
Janspeed Stainless Intercooler Pipes
Getting air to the engine is one of the main ways to increase performance, these pipes are wider than the stock effort allowing a greater flow.
Jump Start Boxes
Jumper Cables In the good old days when everything was black and white, your only option for jump starting your car was a long set of unwieldily cables and a willing participant who owns a functioning car who was either there or willing to travel to you. That's all...
Larger Throttle Body
The original throttle body has a fairly small opening, bigger is better. For the smart 450 and Roadster ONLY. NOT 451.
Loose Wastegate Arm
This is becoming more of a problem as the smarts on our roads get older.
Lowering The Engine – 451
This page covers tipping the engine to gain access to the pulleys and full lowering of the engine. Tipping The Engine As with other smarts, the access to the pulleys is restricted but tipping the 451 engine is a bit more tricky. Place a jack under the gearbox and...
Lowering The Engine – Roadster
The engine bay is quite restrictive so lowering the engine a bit can help a lot.
LPG Conversion
LPG, The Money Saver Wrong. Maybe in the good old days but not so much any more. Why Not? 2 reasons. Firstly, the cost of LPG has increased. 2010 = 30p a litre. 2018 = 60p a litre. 2024 = £1.20 a litre If you take into account that LPG is 25% less efficient than...
MB229.51 Specification
The smart diesel 451 54bhp has to have specific oil.
MHD Belt Change
Jack the car up and remove the wheel to access the belt cover. Each end of the belt cover is a plastic plug. They are nice and easy to lever out... ...which releases the clips on the other side. With both plugs pulled down, the cover can be pulled from the car. You'll...
MHD Starter ECO Fault
There is a new common fault on the 451 MHD that causes the starter to stop working
Mocal Intercooler Pipes
Mocal were the first proper full replacement IC pipes made for the smart in any great quantity. Due to Mocal’s great advertising (as in let’s not bother) they have been a well kept secret for over a year.
No Throttle Response
I Have No Throttle Response 99% of the time I hear this, the alternator has just been changed and people are convinced they screwed something up during the fitting. Well, you did, we'll come back around to that in a bit. I Haven't Changed The Alternator Try cleaning...