My CRT.5EXT...;)

[glassdoctor]

You need to drop to a milder lower kv motor... from teh 10L to a 13L. Then you gear for the same top speed.. and you should have similar performance (and max watts) so the amps should drop accordingly.

This should be much more effective than simply regearing the same setup and boosting the voltage. That 10L will "want" to make the most power it can, even if you gear down. What it's doing on 4s is accelerating harder and spinning at higher rpms than it did on 3s. Even though the top end is the same.

Without swapping motors, then what you could do to loower the amps... is soften the trigger finger (or set radio/esc to very mild accleration curves) to compensate for the fact that it has more power on tap.

[GO-RIDE.com]

Cemetarygates,

What are the handling differences btwn the stock chassis and extended RCM chassis? Did you have to change any of the suspension set ups?

I just rcvd the RCM chassis, but will not have time to build it up for a couple of weeks.

[starscream]

You will indeed lower current by both increasing voltage AND lowering the gearing. You will also increase the potential amp draw by increasing the voltage. This is why you may see high amp spikes

What you should be looking at is the average amps not the amp spikes. You may see a 91amp spike but your average amp draw should have decreased in comparison to the 3S setup with appropriate gearing.

For instance, I have recorded an average of 40amps with 8S A123 and an average of 35amps running 10S A123's with appropriate* gearing

It looks like you had an average amp draw of 8.38 amps. I would guestimate that 3S would increase the avg amps to ~ 12+ amps

I would be interested to see what you record with a 3S setup with appropriate gearing.

* appropriate gearing is the gear ratio required to meet the same speed at any given voltage

Originally Posted by GO-RIDE.com

Cemetarygates,

What are the handling differences btwn the stock chassis and extended RCM chassis? Did you have to change any of the suspension set ups?

I just rcvd the RCM chassis, but will not have time to build it up for a couple of weeks.

well, with the new chassis I can push much harder into the turns without flipping the truck. I also put some HPI MT firm springs in the rear.

Originally Posted by starscream

You will indeed lower current by both increasing voltage AND lowering the gearing. You will also increase the potential amp draw by increasing the voltage. This is why you may see high amp spikes

What you should be looking at is the average amps not the amp spikes. You may see a 91amp spike but your average amp draw should have decreased in comparison to the 3S setup with appropriate gearing.

For instance, I have recorded an average of 40amps with 8S A123 and an average of 35amps running 10S A123's with appropriate* gearing

It looks like you had an average amp draw of 8.38 amps. I would guestimate that 3S would increase the avg amps to ~ 12+ amps

I would be interested to see what you record with a 3S setup with appropriate gearing.

* appropriate gearing is the gear ratio required to meet the same speed at any given voltage

Heres the info:

3s w/10L = 13.13amps avg.
4s w/10L = 8.38 amps avg.
4s w/9xl = 12.10 amps avg.

So, is it safe to run the truck with the 9xl(100A spikes) and not harm the battery? Thanks for all you help everyone!

Bye

[starscream]

Originally Posted by cemetery gates

well, with the new chassis I can push much harder into the turns without flipping the truck. I also put some HPI MT firm springs in the rear.

Heres the info:

3s w/10L = 13.13amps avg.
4s w/10L = 8.38 amps avg.
4s w/9xl = 12.10 amps avg.

So, is it safe to run the truck with the 9xl(100A spikes) and not harm the battery? Thanks for all you help everyone!

Bye

Well, if you overheat teh pack you could damage it or it could catch on fire. You should not let a Lipo pack's temp go over 140deg F.

I think 100AMP burst is the probably reaching the limits of 15C cells but I do not know for sure. This is a question you should pose to the manufacturer so you get a definitive answer.

Originally Posted by starscream

Well, if you overheat teh pack you could damage it or it could catch on fire. You should not let a Lipo pack's temp go over 140deg F.

I think 100AMP burst is the probably reaching the limits of 15C cells but I do not know for sure. This is a question you should pose to the manufacturer so you get a definitive answer.

Thanks for your answer, I'll call Dan @Truerc soon. BTW my pack only heats up to around 95F, motor is at 140F, and the esc is at 135F.

[DRIFT_BUGGY]

It says on the site to use Traxxas Rear Wheels but you are using Traxxas Front wheels. Are they basically the same?

[DRIFT_BUGGY]

Ok, just found out on Tower Hobbies that the rears have a greater offset. I have owned 2 Traxxas Stampedes and I didn't know that, lol