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LRP X20 13.5 timing/gearing help

LRP X20 13.5 timing/gearing help

Old 04-15-2015, 07:39 AM
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Default LRP X20 13.5 timing/gearing help

Hi all, can anybody tell me a good starting point for timing/gearing on the LRP X20 13.5 running in blinky mode? Running on a med sized track with about 80m (250ft) straight. Currently have 30 deg timing insert, 4.00 FDR but seem to be lacking a pit of straightline speed.

Also how hot is this motor comfortable with running to? I've read some online reports that people have run it over 100C with no issues? I generally run my motors up to around 65C but just curious to know how much I can push this motor.

Thanks
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Old 04-15-2015, 10:01 AM
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although i have only ran a 17.5 in blinky and a boosted 13.5 imo they dont make for a very good blinky motor,they are high revving so try dropping the gearing to say 4.8/5 and try again,but most people that i know have to turn the 32.5 insert around so it faces in,not sure its legal to do that in order to get more timing
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Old 04-15-2015, 11:14 AM
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Originally Posted by Zhangesh View Post
Hi all, can anybody tell me a good starting point for timing/gearing on the LRP X20 13.5 running in blinky mode? Running on a med sized track with about 80m (250ft) straight. Currently have 30 deg timing insert, 4.00 FDR but seem to be lacking a pit of straightline speed.

Also how hot is this motor comfortable with running to? I've read some online reports that people have run it over 100C with no issues? I generally run my motors up to around 65C but just curious to know how much I can push this motor.

Thanks
250ft straight, and you call that a "med sized" track ? wow

4.00 is what we run on 100+ ft tracks, I'd guess you are way under-geared for what you are doing, don't think the X20 is a hi reeving motor at all, compared to some others out there

Have you tried going up on gear yet, try that and check temps with each jump on pinion, to see if temps come down

Sometimes spinning a motor at too high revs causes more heat than too much gear
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Old 04-15-2015, 11:40 AM
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Originally Posted by RedBullFiXX View Post
250ft straight, and you call that a "med sized" track ? wow

4.00 is what we run on 100+ ft tracks, I'd guess you are way under-geared for what you are doing, don't think the X20 is a hi reeving motor at all, compared to some others out there

Have you tried going up on gear yet, try that and check temps with each jump on pinion, to see if temps come down

Sometimes spinning a motor at too high revs causes more heat than too much gear
Completely agree with Dave,
Ive run the LRP 13.5 in blinky several times on a 200ft + straightaway (2014 worlds track in Kissimmee ) and have ended up with a final as low as 3.5 depending on track temps. Motor comes off around 160-170 degrees. It definitely doesnt rev quite as much as others...
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Old 04-15-2015, 12:20 PM
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I used to run one up until a few months ago at 3.9 with timing at 37.5 on a similar size track.

Would come off around 75deg at worst. Never had issues with being slow.
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Old 04-16-2015, 05:01 AM
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Try 45 deg timing (maybe try 47.5) , 30 deg block backwards gearing probably about 3.7.
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Old 04-16-2015, 05:55 AM
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Originally Posted by DamianW View Post
Try 45 deg timing (maybe try 47.5) , 30 deg block backwards gearing probably about 3.7.
That will fry I reckon! Have you tried that yourself?
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Old 04-16-2015, 06:00 AM
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Thanks guys I'll try longer gearing. How does reversing the inserts work? So reversing the 30deg insert will give me 45deg timing? What about it i reverse the 35deg insert?
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Old 04-16-2015, 07:10 AM
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The standard inserts are

27.5, 30, 32.5, 35, 37.5

The timing you will get with the reversed is;

R37.5(37.5), R35(40), R32.5(42.5), R30(45), R27.5(47.5)

37.5 is horizontal. So reversing it does nothing. When you line them all up it become obvious.
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Old 04-16-2015, 05:58 PM
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Ah, thanks cplus
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