cosm3os

Coming from the BMW/front engine world. Front pads typically wear 2:1 F:R. What can I expect in a 997 with the weight out back?

Bill Verburg

It's going to depend on how much you rely on the nannies, the rear brakes tend to see a lot of use when PSM intervenes.

Slakker

I'm not sure about the 997 but the 996 seems to be a little heavily front biased. I've been seeing closer to 2.5:1 wear rates.

mark kibort

theoretically, the 911 with the weight balance difference can run 50% more braking in the rear..and 15% less front braking.
i have a front engine racer.. my ratio is about 5:1 front to rear, but i have enough off throttle engine braking to almost hit the limit of adhesion in the rear on a threshold decel. (1+G negative ). I tried to increase bias to the rear once, in fact at the run offs, and all that it did was send the rear end sliding on any trail braking activities.. switched it back to near stock bias and the problem went away.

cosm3os

Nannies off. So sounds like wear rates are roughly the same as a front-engined car. Thanks.

1G of engine braking! That's crazy!

mark kibort

haha,,, that would be a neat trick! actually, i was referring to the amount of max braking you can have in the rear with a 1g decel rate. (most all the braking force comes from the front brakes due to weight transfer)

again, theoretical, because you can have 50% more rear braking forces vs 15% less front braking forces (all other things being equal) the 911 should go through rear pads faster... 50% faster.

cosm3os

Theory. But do they? Just trying to stock my spares box correctly!

linzman

Can't speak for 997, as even mannies off may have some rear wheel braking???? but in my older 911s, i found 2:1 front to rear wear to be a good approximation.

morsini

You will see the same with the 911, however you'll wear 2-3 sets of rear tires for every front set.

mark kibort

I think 3-4:1 should be a good approximiation, but it depends on how you drive

you shouldn't see the same as the M3, as i mentioned, you should have 50% mor braking effectiveness on a 911, if you don't see that in pad wear, you are not driving hard enough...... the less you brake, the more percentage of overall braking the rears contribute... just a fact.

morsini

Mark, do me a favor and stick to what you know. I understand you think you know everything, but you don't. Oh, and I don't care that you were just kidding, adding your two cents, or any other lame excuse you make up for behaving like a child.

mark kibort

Yes, so i would advise you to what i do know.. Driver a little faster and to the limit, and you find what i say is true... if you dont, you arent. I think your DEing vs Racing of the two cars in question shows my point. it's really simple. A 911 can and should have 50% greater pad wear than a BMW or front engine car, all things being equal and driviing at least somewhat near the limit. I dont think you have any data to the contrary, but if you do have front engine vs rear engine track time to make such a statement of "fact" , i would like to see the data as i have.
See you at laguna or sears this season! Have fun!

sounds reasonable and in contrast with the front engine folks i race with month after month, 20 years later!

911racer

My experience with the 997 is that it is going to be right about the same as you had seen previously. Two sets of front pads for every one set of rears.

Thanks

Ed

mark kibort

What is your use of the car. DE, time trial, street driving, mix above?
Nannies on?

johneecatt

I do Time Attack in an early 996 with no nannies and enough street driving to get me to and from the track. My pad wear is surprisingly even. When I change pads, it's usually all 4.