kirk said:just curious. it seems like i never get it over 3k rpm's on the highway. even when i punch it, it RARELY gets over 4k. who out there has gotten the thing to redline and what were the circumstances?
kirk
Perhaps my CVT is malfunctioning but if I mash the pedal on the freeway (cruising at 70-80mph) it usually gets up damn close to redline.kirk said:just curious. it seems like i never get it over 3k rpm's on the highway. even when i punch it, it RARELY gets over 4k. who out there has gotten the thing to redline and what were the circumstances?
kirk
I don't think to many people redline their Mo's for very long if ever. One sure thing that will happen is that your fuel economy will go into the toilet.kirk said:just curious. it seems like i never get it over 3k rpm's on the highway. even when i punch it, it RARELY gets over 4k. who out there has gotten the thing to redline and what were the circumstances?
kirk
This is all true, except you mean torque instead of horsepower. Torque is instant power at a given RPM, horsepower is the Torque times distance travelled. Torque is what you feel as "power".Kan-O-Z said:I would guess the reason that the Murano doesn't actually go to redline or beyond is that it is not needed!
Let's think about this for a second. If you want the ultimate acceleration then the best way to get it is to get the RPMs to right where the engine is producing the highest horsepower. In most cars, redline actually produces less than the maximum hp!
So why redline any car? Well the answer to this is that acceleration is directly related to the average hp. So even though redline produces less than max hp, as soon as the next consecutive gear is achieved the rpm drops putting it close to the max hp rpm range. So in essence, redlining a car is only beneficial because the average rpm is close to the max hp rpm.
In a CVT, this method need not apply as this transmission is advanced enough that instead of hovering around the max hp rpm(by passing it redlining then going below it as soon as you shift gear), why not just stay put at max hp rpm. For the Murano this is 5600 rpm. There is really no need to redline as this would actually be lower performance than at 5600 rpm.
If the engine never exceeded the rpm's @ peak hp you limit the top speed available. The SE 6 speed manual mode for example would not be able to go to the redline for those who care about such things.Eric L. said:Yeah theoretically the CVT should not ever exceed the hp peak, where the engine is providing maximum acceleration. But it does anyways, so there must be a good reason the engineers programmed the CVT computer to let it do so.
In a conventional manual or automatic, it makes sense to exceed the hp peak RPM since this may push the revs into a meatier part of the powerband after the next upshift. For the CVT, this is not the case.
How's this for a reason? - limiting strain on the CVTEric L. said:Yeah theoretically the CVT should not ever exceed the hp peak, where the engine is providing maximum acceleration. But it does anyways, so there must be a good reason the engineers programmed the CVT computer to let it do so.
In a conventional manual or automatic, it makes sense to exceed the hp peak RPM since this may push the revs into a meatier part of the powerband after the next upshift. For the CVT, this is not the case.