5.5t

[cuervo86]

any body got any thoughts of running a 5.5t in mad rat at club level? gearing
24 pinion 80 spur gear or could you run stock pinion and spur?

[Tom3012]

Personally i think a 5.5 is far too much, a 6.5 or 7.5 should be the fastest you'd want to go

[iamdigger]

I'm a bit new into this but my brother, my friend and I all bought a 5.5t motor and esc,(ezrun) running on just normal ni's (7.2v 3000ma) and on the lowerest setting for take-off (1!) and loosened the slipper off and compressed the spring but this weekend we have all stripped the gears. Not got around to opening them up yet to find the problem but I would say that 5.5t is a little to snappy.

I heard (read) somewhere that for racing you are better off with a 8.5t but running it on 11.1v lipos or 14.8v lipos, this will out proform a 5.5t because it only draws about 3600kv rather than 6000kv, this should give better instant power for jumps, better topspeed and takeoff, ofcourse the downside is the battery is even more £costly£ and more weighty. (p.s this is second hand information and is only what I have read but seems logical)

OHH! Anyone know of any RC shops on the IOW that sell madrat parts, I.E gears ?! Want to get my car running again asap as my lipos have got here today, yay.

[MrMagoo]

I'm running an 8.5T at the moment and have found it pretty spot on in damp conditions. Yesterday was my first outing on dry astro and while the car was good the extra oomph of a 7.5 would have been good. Not sure my reactions are good enouh for a 6.5 or 5.5 - would just get me to the next crash sooned!

[cuervo86]

iamdigger are you planning to replace the gear with a metal one? it was the ezrun kit i was looking at, just seems you can get 5.5t cheaper then a lower turn motor thought i could power it down using esc

[kaylon]

I'd also check that the clubs allow 5.5t... personally I feel that a 5.5 is a bit over the top for anything

J.

[peetbee]

Originally Posted by iamdigger

I heard (read) somewhere that for racing you are better off with a 8.5t but running it on 11.1v lipos or 14.8v lipos, this will out proform a 5.5t because it only draws about 3600kv rather than 6000kv, this should give better instant power for jumps, better topspeed and takeoff, ofcourse the downside is the battery is even more £costly£ and more weighty. (p.s this is second hand information and is only what I have read but seems logical)

I wouldn't follow that advice, for racing a 7.5 or 8.5 running a 2S 7.4v lipo is more than enough power for a 2wd car.

[cuervo86]

Originally Posted by peetbee

I wouldn't follow that advice, for racing a 7.5 or 8.5 running a 2S 7.4v lipo is more than enough power for a 2wd car.

yer your right i wouldnt want to run more then 2c also at other clubs its all you can run in 1/10th

[damselfly]

I'm using a 10.5t 4500Kv geared 29/80 on 2s which is hitting somewhere between 45 - 50mph i'd guess.
I'd dread to think what a 5.5t would be like in terms of tyre wear.

[iamdigger]

Originally Posted by peetbee

I wouldn't follow that advice, for racing a 7.5 or 8.5 running a 2S 7.4v lipo is more than enough power for a 2wd car.

I was just stating that it would be better to get a 8.5 / 7.5, and if that is not fast enough buy bigger volt lipos rather than a 5.5t motor and have the best of both worlds. I have a 5.5t and everyone has said the same thing ''oh dear''. Should have got a 8.5 !

Also I have now got my lipos and will fix the car asap and let you folks know how it is. If anyone has a 8.5t and can get hold of a 11.1v lipo I'd (and possible others) would be interested to know what it's like.

[colmo]

I've been considering what adjusting the end points on the throttle would do for, say, a 5.5T (lets say a Novak Ballistic at 7400kv, as they kindly provide a chart here) v a 8.5T (5000kv).

In terms of speed, the extra ~50% revs could be capped by setting max throttle end point to 66%.

This of course doesn't take into account torque differences, which I suppose on the quicker motor could be smoothed out by gearing up, increasing timing (EZRun is sensorless, so only on the motor endbell, if possible), reducing punch on the ESC and putting some negative exponential on the throttle (needs a decent radio for that feature).

[MrMagoo]

Originally Posted by iamdigger

I was just stating that it would be better to get a 8.5 / 7.5, and if that is not fast enough buy bigger volt lipos rather than a 5.5t motor and have the best of both worlds. I have a 5.5t and everyone has said the same thing ''oh dear''. Should have got a 8.5 !

Also I have now got my lipos and will fix the car asap and let you folks know how it is. If anyone has a 8.5t and can get hold of a 11.1v lipo I'd (and possible others) would be interested to know what it's like.

As far as I'm aware you won't be able to use more than a 2s pack if you're racing. As previously stated my 8.5T setup with 4600 40C cells is a great combination of punch and top end in most conditions, I only want more went the track is totally dry, and even then I'd probably only go to 7.5 or may be 6.5.

Being a race-head I've never seen the point of the 'how fast is it mister' argument... as long as the answer is 'fast enough to beat you' I'm good.

If you want to run 11.1 for bashing it'll be nuts I would think, just make sure you have your slipper and diff set on the money, and keep some spare transmission parts around... chances are you'll need them sooner or later.

I have run a 6.5T on 4500 30C's in my DEX and that's ballistic, my old man reactions are only just good enough to keep up with it. How the big guns run 5.5T is beyond me.