Odd question (maybe), can you "rev too hard"?
05-26-2014, 06:49 PM
#31
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Location: PA & FL - '12 Carrera GTS
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Of course it's fine, and shouldn't put you off buying one! Modern engine oils mean you can thrash it from cold if you want, but most enthusiasts - myself included owners treasure there cars and like to think they're taking care of them. However my race engineer, quite justifiably, will happily rev his cars from cold because he has a better understanding of modern engineering that i ever will!
05-26-2014, 07:55 PM
#32
Former Vendor
Salesmen usually have the littlest technical background (not applies all of them, in general).
It is ok to hit the rev limiter. Over and over, back to back, each gear. That is the highest rev Porsche would safely stop you in order to protect the hardware. However it is not the best practice, because at the rev limiter you are under the peak power level of that gear. What you would want to avoid at all the time is over-revs.
These cars are meant to be driven at high rpms. Believe it or not, the engines are healthier when driven like that.
It is ok to hit the rev limiter. Over and over, back to back, each gear. That is the highest rev Porsche would safely stop you in order to protect the hardware. However it is not the best practice, because at the rev limiter you are under the peak power level of that gear. What you would want to avoid at all the time is over-revs.
These cars are meant to be driven at high rpms. Believe it or not, the engines are healthier when driven like that.
05-26-2014, 08:10 PM
#33
Instructor
Thread Starter
Salesmen usually have the littlest technical background (not applies all of them, in general).
It is ok to hit the rev limiter. Over and over, back to back, each gear. That is the highest rev Porsche would safely stop you in order to protect the hardware. However it is not the best practice, because at the rev limiter you are under the peak power level of that gear. What you would want to avoid at all the time is over-revs.
These cars are meant to be driven at high rpms. Believe it or not, the engines are healthier when driven like that.
It is ok to hit the rev limiter. Over and over, back to back, each gear. That is the highest rev Porsche would safely stop you in order to protect the hardware. However it is not the best practice, because at the rev limiter you are under the peak power level of that gear. What you would want to avoid at all the time is over-revs.
These cars are meant to be driven at high rpms. Believe it or not, the engines are healthier when driven like that.
Again, not to ask dumb questions but this is my first Porsche and I want to make sure I understand everything as best as possible.
05-26-2014, 08:43 PM
#34
Instructor
As to over-revs, they're divided from 1-6 and recorded on the car computer. If I recall correctly, a '1' means you hit the rev limiter. I *think* to hit 2-6 you need to downshift at either a bad point or miss a gear. I don't know the threshold differences between 1-6, but in any event, a durometric or a PIWIS should be able to pull those from the car to let you know how many times each one has been hit.
05-26-2014, 09:03 PM
#35
Drifting
Not pushing it cold isn't related to the oil (modern synthetics will lubricate well cold), but to the differential expansion of engine components; different metals expand at different rates and can only be designed to fit perfectly at one particular temperature. As these are race trimmed engines designed to operate best with the tighest tolerances at high temps, loose tolerances at lower temps can allow significant blow-by past the piston rings. If you rev too high on a cold engine, it will increase wear, which will eventually lead to a loss of hp.
05-26-2014, 11:22 PM
#36
Three Wheelin'
Engine computers are playing with rich/lean settings when a car is warming up, and the ranges can be fairly significant. When everything is up to temp, the range is much safer. Generally, it's running rich when cold. It's got somewhat sloppy combustion.
Run hard on rich or lean settings = not the best combustion in the world. Shorten spark plug life, and could lead to outright damage and shortened service life of components, such as emissions components.
Running rich/cold and hard = dilution of oil = less protective properties with exhaust byproducts/petrol.
When it's warmed up, the parts fit better, the fuel mixture is less likely to be rich and less likely to dilute the oil and is friendlier to emissions components.
.
Run hard on rich or lean settings = not the best combustion in the world. Shorten spark plug life, and could lead to outright damage and shortened service life of components, such as emissions components.
Running rich/cold and hard = dilution of oil = less protective properties with exhaust byproducts/petrol.
When it's warmed up, the parts fit better, the fuel mixture is less likely to be rich and less likely to dilute the oil and is friendlier to emissions components.
.
05-26-2014, 11:32 PM
#37
Burning Brakes
If I recall correctly, a '1' means you hit the rev limiter. I *think* to hit 2-6 you need to downshift at either a bad point or miss a gear. I don't know the threshold differences between 1-6, but in any event, a durometric or a PIWIS should be able to pull those from the car to let you know how many times each one has been hit.
05-27-2014, 01:15 PM
#38
Of course it's fine, and shouldn't put you off buying one! Modern engine oils mean you can thrash it from cold if you want, but most enthusiasts - myself included owners treasure there cars and like to think they're taking care of them. However my race engineer, quite justifiably, will happily rev his cars from cold because he has a better understanding of modern engineering that i ever will!