Ideally anything driven by the crank. The other advantage to the underdrive pulley is they are usually lighter allowing the engine to spin up faster. Everything that has worked on other engines to increase efficiency should work here, so we reduce the heat, reduce the rotating mass, increase the air in and out, find a way to tune the fuel mix for optimum combustion. All that should add a little more power and increase mpg.
Dink: you are not going to reduce the heat by underspinning the water pump (assuming the pump is belt driven). Actually, it is the opposite.
Spinning the accessories slower this reduces the parasitic loss of hp so you can use it,It does not increase or decrease heat the water pump is always pumping water even when the thermostat is closed and pushing the water a little slower will allow it to stay in the radiator a hair longer maybe reducing its temp a degree or two. By wrapping the exhaust and adding a scoop to direct more airflow to the engine bay we reduce the heat around the engine which will cool the intake, and fuel down a few degrees. This will increase power and mileage because the car will not have to downshift as soon to climb a hill and will maintain a cruising speed with less work.
Quote:
Originally Posted by WilyB
By reducing one or two pulleys by a few millimeters?
Underdrive pulleys are not only smaller but they are lighter reducing the rotating mass freeing hp not creating hp.
Quote:
Originally Posted by WilyB
Are you talking about a supercharger?
No I am talking about cold air intake, larger TB, well designed headder, free flow cat, and free flowing exhaust. All of these along with possible head work will increase the flow of air in and out making the engine more efficient and increasing power and mileage.
I understand and agree about the benefits of lighter pulleys, but on a street driven vehicle, with a tiny battery and a large electrical consumption (A/C, radio, power steering, etc.) and given the extreme sensitivity of German vehicles to voltage variations, I think the benefits are not worth it. I may well be wrong and I would appreciate your feedback over the next few months.
Remember too that aftermarket pulleys are lighter because they lack the harmonic damper and thus could lead to premature engine failure.
I am very interested in your work on headers, throttle bodies etc. I hope you will share with us here your experiments and results.
I understand and agree about the benefits of lighter pulleys, but on a street driven vehicle, with a tiny battery and a large electrical consumption (A/C, radio, power steering, etc.) and given the extreme sensitivity of German vehicles to voltage variations, I think the benefits are not worth it. I may well be wrong and I would appreciate your feedback over the next few months.
Remember too that aftermarket pulleys are lighter because they lack the harmonic damper and thus could lead to premature engine failure.
I am very interested in your work on headers, throttle bodies etc. I hope you will share with us here your experiments and results.
A 15 -20% underdrive should have little to no effect on charging unless you spend large amounts of time at idle. As for the Harmonic Damper the engine is internally balanced and does not have a harmonic damper from the factory it only has a pulley with a thin rubber layer in it to allow the AC and other accessories to run quieter it does no dampening of internal engine vibrations.
I have dropped a line to a few friends in the industry and hope to have a few interested manufacturers on line in the near future. I have forwarded info about the few boards I am on and they will most likely lurk and see what the general stance of the crowd is before making any business decisions. I have had good luck with prior projects and product creation for sport compacts so hopefully I can help everyone out this time also.
i have an acquaintance in socal who makes pulley and throttle bodies. I may call him and see what we can come up with for the smart. I wonder if fidanza would make a fly wheel? hmm....
Cube I put one on David's car. I pulled out his black vent, it only clips in and now has more area for air to come in. Its not part of the box or tube its attached only to the body panel. Push clips from back and pull it out
Cube I put one on David's car. I pulled out his black vent, it only clips in and now has more area for air to come in. Its not part of the box or tube its attached only to the body panel. Push clips from back and pull it out
Do you have any pictures? I didn't try to make mine off because I was worried of water getting in.
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