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Help :( 8ight-T temps gone through the roof!!
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primus95
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Help :( 8ight-T temps gone through the roof!! - 01.14.2010, 01:52 AM

Hi ALL,

Have had my 8ight-T for almost a year now and have had temps dialed nicely for a while now, motor hovers in the 155F range after a hard run.

I rebuild my centre diff last drive, and my front diff last night. I went up to heavier fluid to stop ballooning and now my motor temp has gone through the roof (198F).

Castle 2200Kv - 14/48 gearing on 4s.
Diff fluid = 30/50/10

I can't feel any binding in the diff's. Centre diff was completely rebuilt last run with fresh gears.

What could have caused such a jump in motor temps?

Last edited by primus95; 01.14.2010 at 02:07 AM.
   
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What's_nitro?
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01.14.2010, 02:20 AM

Could be the heavier center fluid sending more power to the rear, therefore creating a heavier load on the motor and pulling more current during acceleration. The way it was set before sounds like it was in the sweet spot for that truck/setup. Could also be the new gears are kinda rough and need time to break in...IDK Just an idea.


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pinkpanda3310
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01.14.2010, 03:36 AM

Did the temps on the esc change?
   
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primus95
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01.14.2010, 03:52 AM

Quote:
Originally Posted by pinkpanda3310 View Post
Did the temps on the esc change?
I cut the top off my MMM and this is the first run where I can temp the heatsink without plastic in the way so I'm not 100% sure on that one.

I found this great article on Diff Tuning and I'm thinking I've gone too heavy in the front (and possibly the centre):

http://www.redlineracingrctrack.com/...php?f=11&t=850
   
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magman
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01.14.2010, 12:29 PM

30 does seem a bit heavy for the front. The heaviest I run in the front is 20 in my truggy


1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
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4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S
   
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primus95
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01.14.2010, 06:44 PM

I'm going to run 10/20/7 when I get some 20 weight fluid.

For now I will have to run 7/10/5

What are the racers out there running in their Truggys?
   
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Bondonutz
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01.14.2010, 07:42 PM

In my Lightning Stadium Pro2 Basher I had 7k/F-10k/C-3k/R and now I run 30k/F-100k/C-50k/R and have found zero temp changes ????

In my other Center diffed buggy and truggy I run 7k/10k/3k viscositys.


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primus95
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01.14.2010, 10:52 PM

Could crappy lipo's cause a temp increase?

When I temped everything after running, my lipos were about 20F hotter than normal and I have noticed that one of them is puffed a little (hard case has come apart at the seam).
   
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stum
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01.18.2010, 04:50 PM

I'd bet on a bind in the drive train.. maybe the rear diff? How do the wheels spin when the motor is off? Is it super smooth and free? I highly doubt a diff fluid change would do more than +/- 5degrees.


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bryan
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01.18.2010, 07:42 PM

Pinion/spur mesh too tight maybe.Drinking beer at my work bench has done it to me.
   
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