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Old 11-29-2011, 01:44 PM   #91
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I just receive my reedy 10.5, but there are one things i don t like already...
The rotor clearance, and hard to find 4.75 shim to limit the play...
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Old 11-29-2011, 05:08 PM   #92
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Originally Posted by radwerx View Post
I see. Bcos there seems to be quite a number of rotors available but it is not stated which of those are standard items in the stock and mo motors.

As far as I can see there are:

12.3 x 24.2 (7.25)
12.3 x 25 (7.25)
12.5 x 25 (7.25)
12.2 x 25 (5.0)
12.5 x 25 (5.0)

Also, what does the 7.25 and 5.0 refer to? You mentioned that the stock rotor in a stock class motor may be a 12.5 x 25. However there is a 5.0 and a 7.25 version of that rotor. So which is the exact one found in an off-the-shelf Sonic?

Thanks.
tuning with a 17.5. What would be the performance difference between the 12.3 rotor lengths? 24.2 and 25
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Old 11-29-2011, 08:47 PM   #93
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Hello,

What sertings should I use with Lrp Sxx ver2 with software v4.0? X12 or non X12 settings???
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Old 12-01-2011, 11:33 AM   #94
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Originally Posted by Rick Hohwart View Post
I recommend your car/battery/track/temp gun as the dyno. Actual on track testing delivers the best results.
Fortunately, as an old nitro guy, my Exergen D500 temp gun now is a part of my "must have tools" in my electric on-road box.

Rick, please provide additonal feedback, using a LRP SXX stock spec speedo, 0/8/9/4 settings in 1/12th scale indoor carpet racing with a Reedy 1s 65c 5500mah pack, what it the ideal temperature range for the motor and where on the motor should we take a reading?
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Old 12-01-2011, 02:27 PM   #95
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Originally Posted by Carl Giordano View Post
Fortunately, as an old nitro guy, my Exergen D500 temp gun now is a part of my "must have tools" in my electric on-road box.

Rick, please provide additonal feedback, using a LRP SXX stock spec speedo, 0/8/9/4 settings in 1/12th scale indoor carpet racing with a Reedy 1s 65c 5500mah pack, what it the ideal temperature range for the motor and where on the motor should we take a reading?
80degC, on the can (I asked before)
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Old 12-03-2011, 07:52 PM   #96
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Any advantage to running ceramic bearings in the sonic motor. Also where can I purchase them?
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Old 12-12-2011, 06:18 AM   #97
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Finally gave the 17.5 motor a few packs in with boost.

6.3 fdr
50 boost
15 turbo
5k- 20k
1st timing mark on the older unmarked can.

I definatly noticed the infield driving was smooth and consistent. Top end was lacking. Heats up pretty quick.

My D3 with almost the same settings is way more punchy and agressive with the same temps.

I do like the throttle feel on the infield tho, its easier to drive your lines in the corners. I will play with the settings more to try get cooler temps and a little more punch/top end out of it.
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Old 12-12-2011, 06:58 AM   #98
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I would add some more gear (say mid 5's FDR), and back off on the ESC a tad. I am finding this is what my motor likes in boost.
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Old 12-12-2011, 08:45 AM   #99
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Quote:
Originally Posted by goots View Post
Finally gave the 17.5 motor a few packs in with boost.

6.3 fdr
50 boost
15 turbo
5k- 20k
1st timing mark on the older unmarked can.

I definatly noticed the infield driving was smooth and consistent. Top end was lacking. Heats up pretty quick.

My D3 with almost the same settings is way more punchy and agressive with the same temps.

I do like the throttle feel on the infield tho, its easier to drive your lines in the corners. I will play with the settings more to try get cooler temps and a little more punch/top end out of it.
I ran my 17.5 in blinky this saturday the exact same settings as I previuosly ran my D3 and it was slow.Same track I ran the D3 at 3.8FDR ended at 3.6FDR (2 pininon diff) with reedy and it still wasnt the same.
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Old 12-12-2011, 09:03 AM   #100
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Originally Posted by traitor View Post
I ran my 17.5 in blinky this saturday the exact same settings as I previuosly ran my D3 and it was slow.Same track I ran the D3 at 3.8FDR ended at 3.6FDR (2 pininon diff) with reedy and it still wasnt the same.
You are most likely geared/timed incorrectly for your conditions... This weekend there were a few Reedy 17.5s in the A at the Midwest Race at Grand Rapids. Some of the best stock TC racers in the nation were there and the Reedy held its own.

Myself and Mockerman ran 4.17 with timing at the start of the screw. I believe Hebert was at the start of the cut-out for the screw at around a 3.9 FDR. I also believe Goetz had one in as well. Horsepower was not an issue for any of us.

This is for an average midwest style carpet track. Your current settings (timing) as well as track type would also help get you better information.

Mike Slaughter

Last edited by masterhit; 12-12-2011 at 09:13 AM.
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Old 12-12-2011, 10:09 AM   #101
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How do the low-turn Sonics compare to the X12? I've ran a 4.0 X12 and it was incredibly smooth. I tried a 17.5 Sonic once and was impressed......

Looking to pick up a new 4.0 or 5.0 motor. I wasn't too happy with how hot the X12 ran, however.
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Old 12-12-2011, 10:29 AM   #102
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Most say the Sonic is smoother or had a better powerband than the X-12. I used a 5.0 X12 and continue to use a 5.0 Sonic. To me the Sonic is easier to drive. I believe that Juho runs a 5.0 as well.
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Old 12-12-2011, 10:32 AM   #103
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Quote:
Originally Posted by masterhit View Post
Myself and Mockerman ran 4.17 with timing at the start of the screw. I believe Hebert was at the start of the cut-out for the screw at around a 3.9 FDR. I also believe Goetz had one in as well. Horsepower was not an issue for any of us.
spec - agreed. i think the sweet spot for timing is somewhere between the screw center and where it starts probably depending on the exact motor. i geared at 4.0/centered, and probably should have been a tooth or two down where you guys were. (splitting hairs at that point).

boosted - because this motor likes so much timing in spec, i've found that running it boosted still requires some static timing remain in there. in fact, i run my spec timing and add boost from there. the gear reduction when boosted takes care of decreasing the load at low rpm's. or, if you turn it way down at the motor, the boost ramp needs to start early, and be relatively steep.

mike slaughter - good job out there. you looked like a champ, man. indy?
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Old 12-12-2011, 10:49 AM   #104
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Hey guys I am looking for a Reedy 17.5, please send me a pm thanks
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Old 12-12-2011, 11:01 AM   #105
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spec - agreed.
mike slaughter - good job out there. you looked like a chump, man. indy?
Fixed it for you! However, my 12th scale main was epic! Even more so considering it was with a Yoke R12.....

But, yes I will be at Indy. It is one of my favorite facilities. I have been pimping Indy to anyone locally that would listen since the Regionals last year and hope to bring a good sized GR contingent down with me.

Back to the Sonic, my next project is to get one up to speed in blinky 17.5 12th. I'm open to suggestions on a starting point.

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