cdi engine swap into Roadster?? - Page 2 - Smart Car Forums
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post #11 of 16 (permalink) Old 01-12-2013, 09:52 PM
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Aside from weighing more, the roadster is less aerodynamic than the fortwo 450. The Cd of the roadster is 0.41 and the 450 is 0.37. However, the roadster has slightly less frontal area. That body would be working the engine really hard!

The roadster-coupe had a better aero rating, 0.39 IIRC.

You would need to design a new exhaust or at least heavily modify the regular one. You would need to find room for a fuel cooler, which on the fortwo cdi, sits under the passenger seat. The roadster is too low to have room there for that. w/o a fuel cooler, the injection system would suffer and eventually fail prematurely.

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post #12 of 16 (permalink) Old 01-13-2013, 01:15 PM
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It would be no problem to put the CDI in the Roadster. If you use the Roadster fuel tank you would not have to put the fuel cooler in the car. The 2009 smart diesels have the bigger fuel tank and they did away with the fuel cooler. You would also need to change the fuel pump and modify it to fit into the gas tank. Use the 4X2 diesel wiring harness minis the Canadian add on stuff. The Roadster will work if you take out the catalytic converter inside of the muffler. Now the dash could be a different story as with the air bags and anti lock brakes. The problem is the VIN numbers on all the parts have to match to keep the check engine lights from coming on. It can be done if you use new parts and then program them to match the SAM and ECU VIN numbers.

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post #13 of 16 (permalink) Old 01-13-2013, 02:55 PM Thread Starter
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cdi engine swap into 452 Roadster

Thanks Gentlemen for your valuable insights and opinions. In my experience, any engine swap can be done and is just a lot of hard work. (That plus sufficient money and dogged determination of course).

I have seen some amazing conversions come out of the least likely backyard garages. Ever been to India and witnessed what those self-taught, but extremely talented and creative folks do there with Diesel conversions? They make things happen!
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post #14 of 16 (permalink) Old 07-09-2018, 09:35 AM
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Did Roadster diesel come alive in America?
Roadster 800 diesel don't have to be slow, tiny engine has been beaten a long way past 100hp.
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post #15 of 16 (permalink) Old 07-09-2018, 10:01 AM
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Most likely no. US border customs usually are not fond of Roadsters. I reckon the few that have leaked through were cars that overstayed their visas or brought over by members of the military and again, overstayed their visas.
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post #16 of 16 (permalink) Old 05-08-2019, 08:01 AM
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sounds like a fun swap.good luck
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