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Old 10-13-2008, 07:44 AM   #16
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smc 5000
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Old 10-13-2008, 02:27 PM   #17
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We tend to stick with the higher-capacity batteries for mod touring around here. At our large asphalt track, we sometimes pull 4000+ out of the batteries in a 5 minute run with large-rotor 3.5's.
SMC5000, Trakpower or Checkpoint 4900 25C, and Core 5000 are all good choices.
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Old 10-13-2008, 02:43 PM   #18
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IMHO, it looks like the IP3800 packs are shaping up to be the pack of choice amongst racers. A lot of racers I know are settling on these packs and from the things that I've read in forums etc, it looks like my local experience is being mimmicked around the world.

Maybe someone could clarify this bit though...
I have been told that bence tests show the IP3800 to pull just as hard as the Orion 30C 3800 packs, with capacities reaching 4200.
My understanding on what I've read about this is that the Intellect has deliberately underrated both their C ratings and capacities..

Would this be the case?

-----

Now onto the next topic.. Motors!

I have been racing 5 cell mod with an LRP 3.5 motor and have found very good pace with this setup. One of the other drivers here races an LRP 5.5 with 6 cell (club rules allow for both). Now my experience has been that we can both be just as fast as each other, that is the power we have at our fingertips seems to be roughly the same.

With the approvals of lipos and a return to 6 cell for mod (at least here in Australia, vote has just been passed by AARCMCC) I am very interested to find a motor that suits short carpet track use, but isnt overpowered under lipos/6 cell.

Has anyone come across any nice comparable setups like the 3.5/5CELL vs 5.5/6CELL ??

-Mark
I've found that a 4.5 with 5-cell and a 6.5 with Lipo are almost a direct comparison this year.
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Old 10-13-2008, 02:46 PM   #19
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Trakpower 4900's work brilliantly with my Novak and orion 3.5. I have run two for nearly 12 months and have not noticed any drop off on performance. Power delivery is very differant from 5 cell. 5 cell + 3.5 roughly = Lipo + 4.5
These are 25c packs. Other guys have run SMC and orion and there is very little differance. Weight balance is much easier to setup on the car with lipos
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Old 10-13-2008, 03:12 PM   #20
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Trakpower 4900's work brilliantly with my Novak and orion 3.5. I have run two for nearly 12 months and have not noticed any drop off on performance. Power delivery is very differant from 5 cell. 5 cell + 3.5 roughly = Lipo + 4.5
These are 25c packs. Other guys have run SMC and orion and there is very little differance. Weight balance is much easier to setup on the car with lipos
3.5 with lipo just sounds insane...lol
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Old 10-13-2008, 05:45 PM   #21
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Default Lipo conversion

ive just changed to Lipo,
I run Mod and chose the Track Power 4900. I gota say i love the ease of maintaining these batteries!

Power and run time is fine. I actually went from a SP (V2) 3.5 down to a SP (V2) 4.0, and it still has HEAPS of pull and plenty of topend.
Again like everyone is noticing, no drop off through the run. Just good strong power all the way!

Im roughly using 1800 Mah per run. So i easily got 2 heats out of a pack. 2 packs is all i have now.

Question : when you (anyone, feel free) changed from 5 cell to Lipo, did you gear up? or down? There seems
to be a bit of debate at my local club as to whats better!
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Old 10-13-2008, 07:55 PM   #22
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Originally Posted by Bluey_74 View Post
ive just changed to Lipo,
I run Mod and chose the Track Power 4900. I gota say i love the ease of maintaining these batteries!

Power and run time is fine. I actually went from a SP (V2) 3.5 down to a SP (V2) 4.0, and it still has HEAPS of pull and plenty of topend.
Again like everyone is noticing, no drop off through the run. Just good strong power all the way!

Im roughly using 1800 Mah per run. So i easily got 2 heats out of a pack. 2 packs is all i have now.

Question : when you (anyone, feel free) changed from 5 cell to Lipo, did you gear up? or down? There seems
to be a bit of debate at my local club as to whats better!
I ran IP3800's on a 3.5 last weekend and was pulling 3500 out every run. On that basis I would recomend bigger packs. Mine got up to the high 50's in temp to so they were working very hard.
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Old 10-13-2008, 08:27 PM   #23
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I ran IP3800's on a 3.5 last weekend and was pulling 3500 out every run. On that basis I would recomend bigger packs. Mine got up to the high 50's in temp to so they were working very hard.

What was your voltage at when you put it back on the charger?
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Old 10-13-2008, 11:05 PM   #24
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currently running SMC 4000 (28c)packs with Castle Creations esc and Mamba Max 7700 at the Gold Coast Track using 3200/3400 depending on the track layout packs come of warm. LOVE IT.
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Old 10-14-2008, 03:28 AM   #25
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Quote:
Originally Posted by Francis M. View Post
3.5 with lipo just sounds insane...lol
Not if you have some throttle control. Lipo has similar output to an IB4200 6cell at the start of the race. If you are a regular mod driver that knows the track well you shouldn't really be using anything less (maybe a 4.0 if car setup isn't quite right).
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Old 10-14-2008, 03:31 AM   #26
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Quote:
Originally Posted by Bluey_74 View Post
ive just changed to Lipo,
I run Mod and chose the Track Power 4900. I gota say i love the ease of maintaining these batteries!

Power and run time is fine. I actually went from a SP (V2) 3.5 down to a SP (V2) 4.0, and it still has HEAPS of pull and plenty of topend.
Again like everyone is noticing, no drop off through the run. Just good strong power all the way!

Im roughly using 1800 Mah per run. So i easily got 2 heats out of a pack. 2 packs is all i have now.

Question : when you (anyone, feel free) changed from 5 cell to Lipo, did you gear up? or down? There seems
to be a bit of debate at my local club as to whats better!
Gear down, the extra voltage will increase the revs so you won't need as higher gearing to get the same top speed.
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Old 10-14-2008, 06:10 AM   #27
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Thanks Tom,
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Old 10-14-2008, 11:55 AM   #28
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Well I managed to get some basic data on the IP3800 packs having now run them for the first time tonight.

It would seem that I am using about 2700-2800mah for a 5min run, when geared at 12.6:1 on a Speed Passion Comp 3.5R v1 motor. Packs peaked at 8.40v (as expected) and after the run measured 7.7v. Battery temps after the run were about 45degs which was roughly 20 hotter than ambient temps at the track.

So far so good..

My next step is to see how these packs hold up when geared at around 9:1 on a much much bigger outdoors asphalt track (tonight was indoors on carpet).
Hopefully I will make the 5mins as others have been reporting!

-Mark

Last edited by mok; 10-14-2008 at 11:56 AM. Reason: typos
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Old 10-14-2008, 04:06 PM   #29
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Quote:
Originally Posted by Francis M. View Post
What was your voltage at when you put it back on the charger?
The charger started at about 7.5v.

Mok: I belive the IP3800's are great packs even in mod but open tracks with a 3.5 and higher temps is pushing their limits. You would be safe with a 4.0.
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Old 10-28-2008, 09:58 AM   #30
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We had to wait, but we finally got a chance to run at the big outdoor track again and I have some results to share...

Speed Passion 3.5R geared at 10.5 gave the best performance (fastest lap, highest number of laps etc) but this was just a little too hard on the IP3800 25C lipos I have. Capacity wise, I was able to last for the 5 minute race but on charge I put back in just over 3800mAh. The motor was about as hot as I like, but the lipo suffered some heat expansion.

Dropping the pinion down 1 tooth was much nicer on the pack and in the end I was able to obtain the same result as the first gear ratio, but there was no heat issues with the lipo. I used the same capacity (ie. all of the 3800mAh that the pack could give).

For one qualifier my charger got turned off in the middle of a charge so I didnt get the chance to have a full capacity in the pack and I hit the lipo cutoff on the ESC. This scenario also generated the excess heat in the IP3800 pack and I did see some heat expansion of the hardcase pack (we're talking less than a millimetre of extra height here).

This pack still performs great at the small indoor carpet track I race at where I pull about 2800mAh with the SP 3.5 geared at 12.6, but I would get something with a bigger capacity and/or a higher C rating than the IP3800.

I am now replacing the IP3800s with LRP 5300 Competition 28C packs which should see the capacity I need and also handle the current draw of the SP 3.5 motor. I know I can go faster by lowering my FDR on the big outdoor track but with the IP3800s I am limited to what these packs can safely provide. With the LRP 5300 28C packs I am hoping to gain at least 1 lap through gearing (motor was revving itself to death by about 2/3 of the straight and I prefer around 3/4 the length to reach max rpm).

-Mark
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