Theoretically...hybrid SLK? - Mercedes Benz SLK Forum

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#1 Old 04-02-2007
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Theoretically...hybrid SLK?

Theoretically, would it be possible to convert the Mercedes into a hybrid? Would it make a significant impact on fuel consumption to have an electric motor mounted on the driveshaft or in place of the starter to give the engine an extra electrical kick? This is totally hypothetical. Just kicking around some ideas. Would something like this be a marketable product? Selling 'hybrid' conversion kits, consisting of a motor mounted to the driveshaft with a sensor under the brake to recharge the batteries by producing drag on the driveshaft, and adding power to the driveshaft when the accelerator pedal is depressed? I've been thinking about making such a product for a long time...but would it interfere with the cars sensors? Essentially you would add a high power electrical motor to a one-way differential connected to the driveshaft...


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#2 Old 04-02-2007
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For arguments sake, say a 25 hp motor and differential package weighing about 100 lbs, with another 50 lbs of lithium batteries.

The cars sensors would think the car is coasting downhill when assisted by electric, and the sensors would think the car is going uphill when being slowed by the charger...is that right? or is it more complicated then that?


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#3 Old 04-02-2007
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my sister in law just bought a civic hybrid. I have no idea how it works. Aside from the basics, liek you said, batteries taking energy from brakes etc etc etc. So me and my bro popped the hood and alas, we were looking baffled.

It would be a neat little addition. But the conversion would probably be very expensive, installation would be tricky, and prob void all warranties. Might be better off just buying one stock.

New Lexus LS300 or 400 something like that, is a hybrid and still goes 0-60 in like 8 secs or less I think. Thats amazing for a hybrid sedan!
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#4 Old 04-02-2007
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Mechanically it would be easy, weight could be a problem you would be adding x amount more to the car and not getting any reduction to compensate so thats going to slow you down a little not such a problem on say an E, S, G that sort of stuff but for the CLK, SL, SLK the more sporting versions its going to get in the way i think.

Its the electronics that would get in the way the car wont compensate for increased resistance so you would need to increase the throttle input to keep the power at the wheels constant or reduce the throttle when the electric motor is working i cant see a way of tricking the car into working with it so you would have 2 totally independent systems working that wont effect the engine as such because it would be thinking from throttle input that its providing the right amount of power so all its sensors would be giving the OK but it could mess with the gearbox since it takes wheel speeds into account so at X RPM in X gear the car would be expected to be in a certain range of wheel speeds thats used to help calculate shifts so that could theoretically be affected causing some issues.

If the electronics could be customized and hooked up to the electric motor then they could control it and the engine as one and if a hook up could be somehow rigged to the torque converter input then the gearbox could be customized to eliminate any issues.

Its a good idea and potentially an easy job to do if done right but i think your going to need everything to be working as one not fighting each other honestly have no idea how popular it would be tho and if the gain would overcome the added weight
#5 Old 04-02-2007
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Quote:
Originally Posted by DansSlk View Post
Mechanically it would be easy, weight could be a problem you would be adding x amount more to the car and not getting any reduction to compensate so thats going to slow you down a little not such a problem on say an E, S, G that sort of stuff but for the CLK, SL, SLK the more sporting versions its going to get in the way i think.
Wouldn't the 25 extra hp compensate for that? I'm sure 25 hp for 200 lbs is worth the trade off?


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Its the electronics that would get in the way the car wont compensate for increased resistance so you would need to increase the throttle input to keep the power at the wheels constant or reduce the throttle when the electric motor is working
Well, i would connect it with a differential, so the power would be additive. when the motor isn't running, it would create very very minimal resistance, it would come on right before the engine starts adding power. Might even get added performance. To the transmission, it should seem like everytime you step on the pedal, you just happen to be going downhill?


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#6 Old 04-02-2007
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I'm not sure about the horsepower to be honest it would need to be tested to figure anything out your going to have more power on the dyno but on the street i honestly don't know.

The boost i guess would be OK but under I'm not sure how it would cope with charging load i guess you would be using the motor as a generator any resistance would have an effect i still think you would need to compensate for that mate.
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regarding a SLK, but I'm fascinated with diesel electric. Dump the Tesla batteries and make it a mid or rear engine roadster, use a integrated electric motor / transaxle with a very small cc TDI diesel.

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#8 Old 04-02-2007
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Right...the resistance/charging would only occur while braking. NOT during anytime the car is running.

The motor would be installed after the transmission, so you would experience less than 10% loss due to drive train resistance.


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#9 Old 04-02-2007
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how about a triturbo diesel electric SLK...the balance should be perfect with the batteries in the trunk, hahaha...


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#10 Old 04-02-2007
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Not when the car is running? i guess you mean when its not under load since you mention braking sounds OK what you lose on acceleration you re-gain when slowing down.

Still not sure how the gearbox would react i should sit down with the tech sheet i suppose and see what it says when it comes to using the sensors.

I think there would be a market for it but on the bigger cars i can't see many people wanting a hybrid sportscar but for the saloon's/4x4's whatever then the boost could come in handy also you will have much more space to install stuff and wont have such an effect on weight distribution.
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