I was racing 1/12th over the weekend, 19t Reedy Quad on Saturday and Reedy 12x1 on Sunday. The car was going soft at about 6 minutes, it was more noticeable in 19t as I then had to basically use full throttle round the whole track to keep momentum up. On Sunday it wasn't quite as noticeable but still lacked punch around the 6 minute mark and my times were about 2 seconds slower for the last few laps. My cells are GP3700 which are about 10 months old now, on Saturday I had 1000ma left in them and on Sunday I had around 600ma left discharging at 20A. So it doesn't seem to be a case of cell capacity but is it just that my cells are worn out now and thats why it's going soft? Motors were not getting hot either, just warm.

Maybe you have 1-2 bad(weak) cells in the pack.

Maybe but it was doing it with all 3 packs, all 3 were bought at the same time.

Just tested one of the packs voltages seem quite even at 6A,

at 1900ma
1.437
1.438
1.436
1.437

at 3800ma (peaked at 3850)
1.536
1.537
1.529
1.529

Similar story when discharging too at 20A so don't think it's a weak cell, don't know if those figures are good or bad though.

The only other thing is that I first noticed it in my first heat I had a very heavy impact at around the 5 minute mark, a marshall was stood in the middle of the track and I hit his foot at high speed and I noticed it after then but don't know if this is just a coincidence. I skimmed and changed brushes in motor to rule that out and tried different motor, the only other thing I could think of is the speed controller? Or is it just that the cells are old and tired? They are not dumping just going very soft around 5-6 minutes.

what is a good motor and setup to use for a 19t?

PM Lutz, He'll give you the hookup

Thanks for the info guys. Mark's site is where I actually stole the idea from. After talking to my local hobby shop guru (http://www.hobby2000gatineau.com), it was suggested that the ball on the center post be shimmed up as mentioned by Scrad.

I think I agree with both Guru Roberto and Scrad. Even if the angle is changed slightly, I just can't see not being able to re-tune using springs. It's my opinion that a few degrees change will not affect the handling of the car. Please correct me if I am wrong on this.

Any ideas on this problem....3 foot of antenna wire!!! I'm thinking of wrapping it tight on the roll over. Any other suggestions? Can't afford another receiver right now.

As I write this, can someone explain the no cutting of the antenna wire? I always beleived that the antenna was tuned via lenght. How can this be since we can change xtals? Does my question make sense?

Vince

I recently added the CRC delrin steering blocks with axles to my car. Its got axles which are secured with an e-clip on the inside. I can't find anything like them on the crc site. The question is, what size are the nuts to secure the wheel? It's roughly the size of a 4-40 but with finer pitch. Is it metric? I lost a wheel in my last main because the nylon in the nuts that came with them is worn out. I need some new ones!

Caliberx,

Unless you rae running on a very large track I would not think that you would need three feet. Mine is at best 14-16 inches. I even cut a couple inches off of the roll over antenna trying to loose a little weight and have had no issues with the signal at all. It is common to coil the receiver wire around the antenna.

Jason56

The new steering blocks have a little slop in them that you can take up with the threaded titanium axels which will use the standard small nuts. I am not sure what size the ones are that you are needing but your hobbyshop should have them and if not a hardware store would. I highly recomend switching the axels though for the titanium.

Greg

As I write this, can someone explain the no cutting of the antenna wire? I always beleived that the antenna was tuned via lenght. How can this be since we can change xtals? Does my question make sense?
It has to do with the band of our radios.The 75MHZ/27MHZ thing.Not the particular frequency within the band.Mario.

Correct me if I'm wrong, but the small changes in frequency we make using our christals don't affect the ideal lenght of the antenna much (mere millimeters probably). Most antenna's are "in the ballpark" in the lenght.
Normally, you should be able to cut your antenna wire exactly in half (as measured from the print inside the receiver), without much range loss. 1/4 lenght should also work. Be precise, and you should have no problems.

Anybody know what brand of foams I can use with this kind of diff?

Kawada fron Japan.

In 19t I would reccomend dialling in a bit higher frequency into your speedo, gearing up, and rolling on the throttle more, if you're driving strapped to keep the speed up, more gear will carry speed better and should be a bit more efficient, you'll just need to roll on the throttle rather than clamping it. Aside from that I'd go to IB cells, as they seem to be the ONLY CELL for 12thscale.

In my last run I did gear up to 55mm and it was quicker at first, my fastest lap was over half a second quicker but it seemed to go soft earlier, around the 5 minute mark. So is this just a case of tired cells?

Unfortunatly IB cells are not legal here till April 1st but I will be getting some 4200's then.