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Old 07-04-2015, 01:03 PM   #8536
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Looking for a bit of gearing advice. I am running a 6.5T motor, on a fairly large track, 30-32sec lap times. I had it geared 18/81 and my motor was getting hot, 175-180f, with speedo temps of about 130f. (it was a hot day as well, 90-94f)

The speedo would go into reduced power due to the motor temp, had the limit set to 80C (176F). No boost or turbo set. (I have increased the temp limit for the motor to 120c (248f) so it will not shut down, but may fry the motor!)

Tomorrow is going to be even hotter, may hit 100f, not sure what way to go with the gearing, up or down? Thinking I should put a fan on it as well.

Any advice is welcomed! And by the way, the buggy is fantastic, I was only 1sec. off the fast guys pace, and this was the first time running off road in 20+years.
I run a 21t pinion on a 6.5 pretty much everywhere in mine, but that's on Astro tracks.

Never checked temps, but it'll happily run 10+ mins.
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Old 07-04-2015, 02:25 PM   #8537
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Quote:
Originally Posted by SLOWINSLOWOUT View Post
Looking for a bit of gearing advice. I am running a 6.5T motor, on a fairly large track, 30-32sec lap times. I had it geared 18/81 and my motor was getting hot, 175-180f, with speedo temps of about 130f. (it was a hot day as well, 90-94f)

The speedo would go into reduced power due to the motor temp, had the limit set to 80C (176F). No boost or turbo set. (I have increased the temp limit for the motor to 120c (248f) so it will not shut down, but may fry the motor!)

Tomorrow is going to be even hotter, may hit 100f, not sure what way to go with the gearing, up or down? Thinking I should put a fan on it as well.

Any advice is welcomed! And by the way, the buggy is fantastic, I was only 1sec. off the fast guys pace, and this was the first time running off road in 20+years.
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I run a 5.5 with 18 pinion and motor runs about 150. Could go either way in gearing. I've seen temps drop going up in pinion but not always. You could be under geared and spinning the motor too fast. What is the timing set at on the end bell? I would definitely run a fan on both esc and motor in hot temps. Also I know you've probably checked but make sure nothing is binding in the drive train.
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Originally Posted by John Myall View Post
I run a 21t pinion on a 6.5 pretty much everywhere in mine, but that's on Astro tracks.

Never checked temps, but it'll happily run 10+ mins.
Thanks for the input guys.

I just checked the motor on my motor checker, it is a new Tekin redline gen 2, I installed it out of the box. The timing was set to 10 on the can, which was 38 actual deg.s. One thing of note, this is the worst sensor board I have ever tested. With 9 deg phase variation. I set it to 0 on the can, 30 deg. actual timing, my Kv dropped 50, but amp draw went down almost 1 amp. This motor does not respond to timing very well.

The poor sensor board will account for some of the heat, and backing the timing down should help as well. I will put a fan on it just to be safe.
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Old 07-04-2015, 08:24 PM   #8538
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I run an Orca 6.5t and it gets about 160f with 18/84 after a good bit of running. I'm sure if I turned down the timing a bit it'd cool down. Also with the '15 car and a shorty there's plenty of room for a fan when you run in super hot conditions. Your temps sound like Florida!
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Old 07-06-2015, 06:37 PM   #8539
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Has anyone else tried the chassis braces instead of the top decks?
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Old 07-07-2015, 07:02 AM   #8540
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All, I am looking for a large outdoor track, loose setup for my '14. Anyone have a suggestion?
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Old 07-07-2015, 07:35 AM   #8541
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Has anyone else tried the chassis braces instead of the top decks?
There is a good write up a few pages back..
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Old 07-07-2015, 11:38 AM   #8542
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just an fyi, discountrcstore now carries xb4 parts!
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Old 07-08-2015, 12:41 AM   #8543
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Is anyone running the shelle 1.5/1.1 and the 1.6/1.1 shock pistons in there xb4, are they a worth while upgrade, and has anyone using them seen performance gains. Currently running on a medium size outdoor track with medium to high grip
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Old 07-08-2015, 12:54 AM   #8544
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Is anyone running the shelle 1.5/1.1 and the 1.6/1.1 shock pistons in there xb4, are they a worth while upgrade, and has anyone using them seen performance gains. Currently running on a medium size outdoor track with medium to high grip.
I've tried the stock 3 hole for and rear, 3 hole rear and 2 hole front, and machined delrin 3 hole and I keep going back to the Schelle pistons. I usually run 35/27.5 to 40/32.5 depending on temp and traction.
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Old 07-08-2015, 12:57 AM   #8545
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I've tried the stock 3 hole for and rear, 3 hole rear and 2 hole front, and machined delrin 3 hole and I keep going back to the Schelle pistons. I usually run 35/27.5 to 40/32.5 depending on temp and traction.
Thanks for that ill give them a try.
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Old 07-08-2015, 07:01 AM   #8546
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Is anyone running the shelle 1.5/1.1 and the 1.6/1.1 shock pistons in there xb4, are they a worth while upgrade, and has anyone using them seen performance gains. Currently running on a medium size outdoor track with medium to high grip

Avids are better. They were actually tested where this guy just ripped off the specs after he left Avid.
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Old 07-08-2015, 09:57 AM   #8547
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I was looking around at some older set ups and noticed Tyler Vik used the 6 degree front camber blocks at OCRC and other places, yet Martin Bayer is running 12 degree hubs, mostly for carpet, but also for testing at OCRC....anyone else running the 6 degree? What do you like about them vs. the stock 9 degree? Are the 12 degree really more for the added initial turn in on carpet?
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Old 07-08-2015, 06:03 PM   #8548
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The 12 degree blocks will be a little lazy off center but have smoother steering, and a little extra at the end of the turn. The 6 degree blocks will be twitchier and harder to drive, but will react better off center. That's the kind of feel I like personally, but I'd say it's up to you and one isn't really "better" than the other, it comes down to the driver. On something ridiculous like carpet though, where you have so much steering and grip already, the 12s will really smooth the car out and carry more corner speed.
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Old 07-09-2015, 07:12 AM   #8549
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All, I am looking for a large outdoor track, loose setup for my '14. Anyone have a suggestion?
Nobody?
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Old 07-09-2015, 10:00 AM   #8550
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Is anyone running toe out higher than stock which is 0 in the front and if u are which insert??
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