RC10Talk - The Net's Largest Vintage R/C Community

I was just at the top notch race and when I looked at the timing on all of the fast 17.5 guys, it was cranked all the way to the max. Why do they do that? I know it gives more top end, but doesn't it put more wear and tear on the motor?

Typicray@rainmans wrote:I was just at the top notch race when I looked at the timing on all of the fast 17.5 guys, it was cranked all the way to the max.

Most 17.5's, like the D3.5 really came alive at +40* timing, some would got to 60+

Typicray@rainmans wrote: Why do they do that?

Increases power everywhere

Typicray@rainmans wrote:, but doesn't it put more wear and tear on the motor?

I was just at the top notch race

large races that are attended by sponsored drivers, or drivers trying to catch the attention of sponsors could care less about motor longevity. When I would run a national I needed tires to last one run, that's it- max performance for that one 5 min run, after that into the trash and on to a fresh set (sometimes over 50 sets of four over a course of a week). Non-sponsored guys would have to make a set last an entire day, or multiple days to afford the event.

I run a Revtek 17.5 set at 40º in my RC10 Classic. It's been in several of my cars and I've had it for over a year and it still runs fine. The key is to not overheat it. There is a huge performance difference in running say 0º, 20º and 40º. If you try to race 17.5 with anything less than 40º, you'll quickly find yourself outpaced.

It just like the old day with tires lasting one heat, motors lasting 10-14 heats and brushes lasting 1-2 heats! The only difference is the battery capacity.

Are 17.5 classes blinky or open to dynamic timing?

RC10th wrote:Are 17.5 classes blinky or open to dynamic timing?

I think that static hall sensor motor timing is allowed, but speedo-based dynamic timing is not. At least that is the rule around here-

Most places around here allow the timing on the motor, but not the esc. Its pretty much become the standard in most places I think.

I crank the timing even at club racing... and sponsored or not sponsored, if the tires are best to be worn out in one run to be fast, then it does not matter if I'm sponsored or not. I will do it. I come from Albuquerque and at the local track there we have been sugaring the track since '94-'95... For a club night I used to glue up 4 sets of rears and 2 sets of fronts for each car I was racing (3 quals and a main). That's what I showed up with.

That is crazy talk! If I buy a new set every month that's a lot.

Orange wrote:For a club night I used to glue up 4 sets of rears and 2 sets of fronts for each car I was racing (3 quals and a main). That's what I showed up with.

ca-rj wrote:That is crazy talk! If I buy a new set every month that's a lot.

Orange wrote:For a club night I used to glue up 4 sets of rears and 2 sets of fronts for each car I was racing (3 quals and a main). That's what I showed up with.

If I get 4 runs out of a of Orange compound in the summer, I'm ecstatic. And that's not overdriving. I let someone wheel my B4.5 and they roached a set of rears in 5 min trying to steer with throttle and not be fluid. When we ran slicks....I'd get a whole season...and then change inserts

That's how it is during the summer. Our outdoor track is super abrasive and can easily kill a set of rears in one run. I'll be racing indoors this coming year for the first time and I hope the tires last longer there.

I can stretch a set of holeshots to two 5 min runs in 10.5 as our track is slippery and abrasive. It worked ok when we ran 3 qual and 2 mains. Now we've gone 3 and 3 so another set of rears is needed.

Man, I am so glad I run indoor clay mostly, my current set is six months old and just getting started

Not that i know what I am talking about, but you really don't drive them then huh? 6 months old on a clay track and I would assume they are well worn?!

BITD (Club Racing), a hard compound tires would last several months, need too specially when your 10 yr/old and no hobby money... hahaha...

now fast forward couple of decades,, still cannot afford spare tires.... coz its hard when you have a 10 yr/old to feed and put to school hahah.. good thing my eldest is very understanding... he loves RC but would rather play with his PSVita , he just say, ok Dad, next time when you have money, we can run... since now you don't have money I will just play my PSVita.. hahah.....

When we raced carpet offroad a set of tires would last a season. They got quicker the older they became but would eventually fall apart and you'd need a new set.