lotus elise power curve

  • Thread starter Thread starter JaySin85
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JaySin85

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JaySin85
With my tuned premium elise (01?), it has a dip in torque and hp about midway through the RPMs. It is a pretty big abrupt dip too, is this normal? It bugs me every time I look at the tuning screen. Doesnt seem to affect me in race, but looks like you would be going through the revs, hit a lull and then have sudden increase in power again, which you would think would be enough to upset the balance of the car while driving.
 
The Elise 111R uses a Toyota engine that has some clever valve timing/cam profile adjustment (VVTi) around 6000-7000 rpm. I guess the dip in the torque curve is a result of this system. I doubt that this would seriously upset the balance of the car, seeing that the torque/power figures are not very high.
Look at the Option Stream Z for a scary power curve :lol:
 
As above, I think there might be a dip when it changes cam profile. Although its the most likely asnwer I have not driven a Vtec so not 100%.
 
Vegard
The Elise 111R uses a Toyota engine that has some clever valve timing/cam profile adjustment (VVTi) around 6000-7000 rpm. I guess the dip in the torque curve is a result of this system. I doubt that this would seriously upset the balance of the car, seeing that the torque/power figures are not very high.
Look at the Option Stream Z for a scary power curve :lol:
Click to expand...

. I dont know why engine upgrades dont get rid of it as its used to save gas in the lower rpm range. It basically retards or advances your valve timing. This is very good for road car but less useful for a racer. Its basically Toyotas VTEC. Whats odd is Im not seeing it in my celicas, which uses the same engine.
 
The cam profile is switched on the engine when it reaches a certain rpm. The low cams are used for low rpm operations and is tuned to maximize torque at those engine speeds. When the engine reaches the switchover rpm it changes to a high cam profile which is optimized for high rpm operations.

The dip in power is most likely because that rpm range is when both of the cam profiles aren't at it's best efficiency. It's out of the low cams optimal rpm range but also it hasn't reached the switchover point for the high cams yet.
 

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