LIPO C rating - What would you go for?
 

What C rating would you go for a Cat SX running 6.5 / 7.5 motor?

Just ordered a LIPO stiff chassis and looking at changing to the Nosram LIPOs etc.

trakpowers new dark cells...........due soon

Anything above 25C continuous would be enough. However, many people have switched to 35C or 40C continuous discharge rates, as the voltage drop under load is not as large as lower C cells, therefore the cells maintain a higher voltage and so the motor can utilise more of its rpm/V (kV).

I personally run a Thunderpower 40C Lipo in my CAT, but I'd have those Trakpower Dark Series Mark has mentioned 'cos they're really nice! 35C or 40C discharge dpending on which you choose, 5C charge rates, excellent life time. Yep, I'd have them. They're about the same price as the LRP/Nosram packs, but will be more accurately rated and closer to their actual specs.

Cool

I've got Team Orion 4800 Platinum and Trakpower 3600s at the mo, but changing chassis and getting some bigger packs :)

I have heard some say that the 40C LIPOs have too much punch

Nah. You can always alter the gearing and ESC settings to tone that down.

Cool and thinking about it yes that makes sense.

Got a Tekin RS Pro in both cars, great for tuning (maybe a bit too much)

30C+ is fine with any cells that are 4200 or above. If you race on ultra grippy astro then the 40C will be useable. But if you race on a variety of surfaces, grass, concrete etc then the 40C will be quite lively.

To be honest, i really wouldn;t worry too much about the C rating. As long as they are 4000mah or more and 25C or more then they will be fine. Just get what you can afford. No point going that extra £20-30 to get LRP cells etc, when you can spend that saved cash on tyres etc

I race on a high grip asto turf track at the moment, but hope to venture further a field next year

Cheers

if there too punchy put a softer motor in....................simples

why buy cells that are too punchy and force you to buy a different motor? just get a lesser C lipo in the first place?!

Gearing down my 7.5 at the mo on the Cat (more to do with heat reasons) Thought about moving to a 6.5, but don't want that much at the mo

your getting a 7.5 hot? or is that the speedo? You must be a throttle jammer! lol

Have you cut out vents etc in the shell and all the usual things?

I ran mine on 6.5 with Vampire Lipo packs and it was more than enough. as for heat I would recommend getting the RS Pro solder tags into an area where air can pass over them really helps.

Vents cut and no real difference. Didn't have the problem with the Lrp sphere.

Tekin thinks it's because the motor is working too hard. Same setup in my XXCR and not a problem

so was potentially looking at a 6.5 speed passion. Mate is running a 4.5 and a 6.5 in his cat and it runs cooler than my 7.5

???

Kevin Lee and I are running 5.5s in our 4WDs with no issue on RS pros...

What's yours set at?

I'll double check again, I think my settings are in the Tekin post.

I think it's because the 7.5 is working too hard for the track and me.. So a high wind = less full throttle etc.

You'd be making your motor hot not the speedo.

Yup the motor is hot hot and the speedo is quite hot too. Around led 4/5 I think

I just put an old Orion 5.5 in the car and managed to get the RS Pro to cut out but have found that the Speed Passion V2.0 6.5 runs fine and only shows two or three LEDs on the temp scale which is fine. I reckon it is something to do with the motor which is why it is getting hot.

I run 35c 4200 Reedy lipos and love them to bits. unless I've been running for very long times I never notice any drop off. 10 minute race in my sc10 with a 19 turn money motor and I only took 2400mah out of them. the motor was the bit letting my kit down I think lol

Going to order the Speed Passion 6.5 V3 I think and see how it goes or failing that borrow a mates 6.5 V2 first and see how I get on.

I just ordered a 5.5 V3. all excited to see how it goes with the 35c lipos :woot:

if the motor and speedo are both getting very hot, couldnt that be down to excessive current flowing to produce power, due to weak magnets???? try a different rotor, could be that the rotors magnetic field has become weak, there is something about this subject on this forum somewhere

I certainly found this with my original LRP X11 motors with bonded rotors. When I put the sintered rotors in they were much more efficient and ran so much cooler. I do like the Orion and Speedpassion motors as they have an internal fan built onto the end of the rotor which I think makes a big difference and does not seem to affect performance.

I'll be eventually changing my X11 too, but that runs fine in my XXCR with Trakpower 3600 30C LIPOs

It's on the Cat SX that has the problem and as other say I reckon it's the motor. As for the LIPOs still un-decided (whatever I get it'll be either a 35/40C, just got to make my mind up as to whether I stick with the standard chassis or go for the new stiff one...)

I had no problems with the CAT SX Nimh chassis as it was easy enough to modify and accepted the Vampire Lipo well. I has yet to try the newer chassis to see if they make a difference.

Go for the Speed Passion Comp 3 motor clearly one of the best on the market and going to be made BRCA legal this month. I'd also go for the Speed Passion lipo's as they do a 4000 35c or a 5000 30c which are high quality cells (priority) :thumbsup:

Do they have humps on them?

NO THEY DON'T

http://www.speedpassion.net/product....9&lang=&page=3

Cool.. Sorry at work trying to get SCCM to image a VMWare box... for a project :cry: so can't spend the day looking at the mo...

Oh and their website is crap!

It's ok just really slow buddy

Look on homepage at who use SP though !!

Wheres Pidge gone on the SP drivers list then?

He has not even made it on there yet , even though Phil only signed recently and is there already. Pidge is their hidden talent...... :p

Now running SP V3 5.5 motor with a GTB (Until my GT2.0 arrives) and Reedy 4200 35c lipos and the car feels very nice so far.

Added 50g of lead under the shaft in the B44 to try and reduce my nose diving

will find out on sunday what it's like at kiddy MAM :woot: