5 amps on 17.5 & no real difference
#1
5 amps on 17.5 & no real difference
I raised my timing on my 17.5 motor and got 5 amps out of it. Didn't see much of a difference except for lots of extra heat. I tried different gearing starting at 30/69 and up to 32/69 and it ran way hot with not much improvement in performance. The buggy was actually faster around 2 amps. What gives?
#2
Tech Elite
iTrader: (28)
I raised my timing on my 17.5 motor and got 5 amps out of it. Didn't see much of a difference except for lots of extra heat. I tried different gearing starting at 30/69 and up to 32/69 and it ran way hot with not much improvement in performance. The buggy was actually faster around 2 amps. What gives?
Did you try going both ways with the gearing? What's way too hot? A number or going by feel only? How long did you run? And double check your out drive bearings, etc to make sure they aren't bad.
#3
What do you mean both ways with the gearing?
#4
Tech Champion
iTrader: (280)
I raised my timing on my 17.5 motor and got 5 amps out of it. Didn't see much of a difference except for lots of extra heat. I tried different gearing starting at 30/69 and up to 32/69 and it ran way hot with not much improvement in performance. The buggy was actually faster around 2 amps. What gives?
#5
#6
Motor analyzers don't replace the feel.
#7
Also, is there a fan on the motor? Unless it's a tekin gen 3, a fan is required.
#8
#9
Motor, weight, gearing, timing? What car?
#10
#11
Tech Elite
iTrader: (28)
I don't run stock/spec classes much because I like to run cheaper equipment and just motor up. The little bit of 1/12 scale racing I did last winter was 17.5 blinky though, and like you, I didn't notice a ton of difference between a motor pulling 2 amps and the same motor pulling 5 amps. I would suggest just playing with your gearing more, and stop using the temp gun. If it literally burns your finger, it's too hot. If not, then you're good. I don't know what recommended temps are b/c I'm too lazy to google it, but 160 sounds pretty conservative. Abusing equipment is the byproduct of running a class that isn't open (mod). Take your pick if you want to abuse your motor or your batteries, or both My advice is if you liked it at 2 amps, run it there. If you're having fun you're doing it right.
#12
Tech Elite
iTrader: (30)
I have ran a few variations of the base motor on a 6500 sq ft track,
I do use a fan just in case it gets a little on the hotter side than I'd like.
I found that 50-55 degrees of motor timing and a gearing at 30-31/69 had the best feel. I usually will normally run a 10min +4-5 laps in a practice session and if it doesn't feel like it's hot or fading, I know it'll be solid for the 8 minute mains we run locally.
#13
What size track?
I have ran a few variations of the base motor on a 6500 sq ft track,
I do use a fan just in case it gets a little on the hotter side than I'd like.
I found that 50-55 degrees of motor timing and a gearing at 30-31/69 had the best feel. I usually will normally run a 10min +4-5 laps in a practice session and if it doesn't feel like it's hot or fading, I know it'll be solid for the 8 minute mains we run locally.
I have ran a few variations of the base motor on a 6500 sq ft track,
I do use a fan just in case it gets a little on the hotter side than I'd like.
I found that 50-55 degrees of motor timing and a gearing at 30-31/69 had the best feel. I usually will normally run a 10min +4-5 laps in a practice session and if it doesn't feel like it's hot or fading, I know it'll be solid for the 8 minute mains we run locally.
Did you check your amps on a multimeter? Best way to find out what your pulling. The numbers on the can aren't always accurate.
#14
Tech Elite
iTrader: (30)
It's a medium/large track. Not too technical, it's more for speed with one big jump basically. Hard packed clay. My motor felt best at around 30-40° but the Amp were way low compared to the other guys with the same motor.
Did you check your amps on a multimeter? Best way to find out what your pulling. The numbers on the can aren't always accurate.
Did you check your amps on a multimeter? Best way to find out what your pulling. The numbers on the can aren't always accurate.
If the 4 I've ran they all seemed to be happiest at those settings, no matter the layout we've had locally, currently a 18-19second lap time for most of the stock guys. I am swear that the timing numbers on the can can be off, which would probably explain why all my motors I've ran fall in that 50-55 area to have the feel I like out of them.
I'd try that gearing with that timing and see what the lap times say.
General rule of thumb
More motor timing=less (smaller pinion) gearing
Less motor timing=more (larger pinion) gearing
Both are for the same spur used
I do know a few guys that run the AE cars and seem to like the 72 spur from avid or scheele more than a 69. I didn't like it as much and stayed with the 69
#15
I have a motor analyzer and the Trinity motors seem to have a fine line between power and heat. Most I have tuned loved 48-52 degrees timing with heat climbing very fast if you go above that. 32/69 is the most popular choice for gearing for most B5M cars I help with. A fan is a must when bumping up your timing.