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10-30-2012, 07:19 AM

#496

Rockin G

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Quote:

Originally Posted by B00t13g

On my reedy 17.5 if I just barely give it any throttle with the car on a stand it will make a weird grinding noise and the pinion will move slightly back and forth. When I say barely I mean a hair past neutral. Motor is extremely smooth elsewhere and performance is spot on. Is how it acts with barely any throttle normal? I've never really noticed it before as I have no reason to give it that little throttle.

Yokomo bd7
Reedy 17.5 max timing, 3.9 fdr with fan comes off at 165 after 6.5-7 minutes. 180 is the highest the motor has seen. Less than 20 packs through it.
Orion r10 pro drrs at 9 blinky. I've tried two different sensor wires and have re calibrated the esc. Thanks.

I have had 2 motors (one Reedy and one Trin) do that grinding sound that you described. One was a bad sensor BOARD. (Trin) and the other was a bad ESC.
1. Have you tried another motor on your ESC to rule out the ESC?
2. Since you have already switched sensor wires, it probably is not the wire. If it is not your ESC or your wire, then in MY experience, there is a good chance that it is the sensor board.

10-30-2012, 07:46 AM

#497

JamesL_71

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I would be a little more concerned with the pinion moving back and forth... How much fore/aft play does the rotor have inside the stator? Have you ever pulled the motor apart, or is it box stock?

10-30-2012, 08:51 AM

#498

Slo_E4

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Quote:

Originally Posted by B00t13g

Your neutral width is too low. Bump it up a few and I bet it goes away.

10-30-2012, 09:21 AM

#499

B00t13g

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I've tried 9% neutral width same issue. I don't recall my schurr speed doing this so I guess it is the sensor board. At least that's $12.

10-30-2012, 12:39 PM

#500

B00t13g

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Ordered another motor and a sensor board. No harm in having a spare 17.5 reedy

10-30-2012, 01:32 PM

#501

Laguna Bozo

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9 is too low. Try 30...

10-30-2012, 02:06 PM

#502

AdrianM

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Quote:

Originally Posted by wtcc

Has anyone ever tried a Reedy Sonic 10.5t boosted? Can this motor take boost well? I ask because my club wants to use this one as stock motor for the club championship without limiting the used escs. So everyone will run this motor boosted...

It runs fine boosted. No problem at all.

10-30-2012, 02:27 PM

#503

B00t13g

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Quote:

Originally Posted by Laguna Bozo

9 is too low. Try 30...

The r10 has 6,9 and 11. I've always run 6 with every car and motor combo.

10-30-2012, 05:07 PM

#504

B00t13g

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I found for me that 49 degrees of timing and gear to temp works best. I ended up at 96/49 which is a 3.91 which worked best for me.

10-31-2012, 09:16 AM

#505

jha07

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I'm wondering what's a good starting point for boosted settings and gearing for 17.5 TC?
I'm currently running blinky, 48 timing, FDR 4.

11-01-2012, 10:59 AM

#506

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What should the FDR be for a 5.5T with no timing?

11-06-2012, 02:24 PM

#507

jha07

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Quote:

Originally Posted by B00t13g

I found for me that 49 degrees of timing and gear to temp works best. I ended up at 96/49 which is a 3.91 which worked best for me.

I've also found that this motor, the 17.5T, likes a lot of timing. I tried gearing up with lower timing, 36-40, and just didn't have any torque. The first time I felt like this motor woke up was when I geared down and turned up the timing. I was up to 46 at my last race. I think it'll probably be better at 48-49.
Compared to others at my track, I'm geared quite a bit lower. Most run FDR 3.8-4, I'm at FDR 4.35. Has anyone else noticed that this motor needs a lower gearing than most motors?

11-06-2012, 02:40 PM

#508

jdeadman

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I keep going lower and lower each week and I am just getting faster. So yes. I am still playing with timing. On the bench I found that as I went up in timing no load other than the wheels and transmission once I got about 30 degrees it peaked then started to drop off the more I went up. This of course is by the sound and nothing more. I am going to look into a chassis dyno (DIY) at some point to be better at testing different gearing and timing settings just to get some data behind my setting changes