Need some advice guys - RC-Monster Forums

crazyjr · 08:10 PM

I plan to run the RC Pro Ga state series this year (Time and money allowing) I got my idea for the stadium truck class set up (want to run electric against the smokers). the racing will be two or three 5 minute qualifiers and a 30 minute Amain. My stadium truck will be an associated t4 with a MM 4600 and 8000 maxamps 2s packs, it should be good for the Amain time.

My need is for MT, I need a setup for the 30 minute A main. My current setup is a Neu 1515/2.5d (1700kv)with maxx/gorilla tranny 20/51 gearing and HB buggy diffs, in a G2R revo, its awsome on 5s but its a bit slow on 4s. running 2s packs in series how would efficiency suffer/improve using 22 or 24 pinion in place of the 20? Would going to a 1515/1y (2200kv) or a 1512/2.5 (2000kv) be better alternatives? Forgot to add, temps on 4s 5000mah maxamps lipo's after 15 minutes: batteries 100* esc 98* and motor 117*. this was on a mid 60's low 70's day

On a similar note, I want to experiment with an idea. I have a setup i love running a 5s lipo with a 1200xl lehner basic in a GT conversion. I want to run a similar setup with a lehner basic XL 2400 or 2800 geared up and running a 2s lipo. I think with proper gearing it would be more efficient that the current setups (ie the novaks mambamaxes and such) I would be running it on a Quark 80 esc. The good thing is that i can play with up to 4s on the same setup, for insane speeds.

thanks for any advice on these questions

crazyjr · 02.28.2008, 02:55 PM

No one is racing with a known good setup for 4s Lipo? I figured someone might have a good recomendation for race setup on 4s. I guess i got to find one. will tell when i get a killer setup

bdebde · 02.28.2008, 04:17 PM

Quote:

Originally Posted by crazyjr

No one is racing with a known good setup for 4s Lipo? I figured someone might have a good recomendation for race setup on 4s. I guess i got to find one. will tell when i get a killer setup

What rig? You mentioned several in the first post.

Matthew_Armeni · 02.28.2008, 04:25 PM

It's for his G2R Revo.

@ crazyjr- the 1515 1Y is an awesome motor on 4s. If you're Revo is light enough the 1512 2.5D might be better, but either way it's still easier for the bigger motor to pull the truck around the track. I remember reading that the Y winds draw more amps then the delta winds, so that could be another reason to use the 1512. Can anyone comment on that (the motor windings, that is)?

crazyjr · 08:27 PM

bdebde, its for my G2R. Sorry,if the post didn't make it clear, I tend to ramble.

M A, thanks for the heads up. I to have heard about the possible difference in amps on the differing types of windings. I believe i could gear the 1515/2.5 i have, but think a different wind or KV would be better. I know Mike has 22 and 24 pinions (Mine is geared 20/51) and i'm sure with plate mods and some coaxing, i could get bigger from Mike. I know the pinion would be cheaper, but is it really as good or better in efficiency to a better KV'ed Motor.

I am wondering if the 1515/1.5d (2700kv) would be a good motor, I got the pinions to gear lower(If i got a smooth can) to keep it running about 40 (47 with current setup on that motor) Anyone have an opinion on this motor?

jnev · 02.28.2008, 08:54 PM

I can't remember exactly who, but one member of the forum ran the 1515/1.5d (2700KV) in a CRT and said that it ran stone cold for them. I am guessing the CRT and your Revo are somewhat similar in weight. If anything, I'd expect the CRT to be a bit heavier.

bdebde · 02.29.2008, 12:28 AM

I don't have a "proven" set up for anything similar, but I think I would use the 1515 1.5D, or the 1512 2D if it is real light. How much it weigh?

Patrick · 01:57 AM

Can you race it on 5s? I race my truggy on 5s with the 1515 2.5D and it seems like a good setup. I use between 1250 and 1500mahs in 5 to 5.5 minutes of racing. The other guys at racing runing 4s use more like 1800-2000mah in a race, and usually have slightly higher temps on everything, some much higher.
I think you'll need a pretty efficient setup with high mah batteries to do 30 minutes non stop in a truggy. We've only had one 30 minute race at our track (electric only track) and I did 26 minutes of it before the LVC kicked in, but my true rc packs were starting to die, because they only took back 6400mah out of an 8000mah pack (they are now dead, and I'm using flightpower 4900's). Almost everyone here in the truggy class is now running 4s flighpower 4900's or 2x 2s trackpower 4900 packs. They can do about 12-15 minutes depending on how they drive.
I'm pretty sure Aangel was doing 30 minutes with his 4s 8t, but I don't know what he did different to me and the rest of the guys at my track. Maybe track layout or driving style?

I might be doing a couple of practice laps tonight at racing with 4s and 3 extra teeth on the pinion, but I don't think it's going to have the power I want.

I think Sower was the one who had the 1.5D in his Crt.

crazyjr · 02:05 AM

Quote:

Originally Posted by Patrick

Can you race it on 5s? I race my truggy on 5s with the 1515 2.5D and it seems like a good setup. I use between 1250 and 1500mahs in 5 to 5.5 minutes of racing. The other guys at racing runing 4s use more like 1800-2000mah in a race, and usually have slightly higher temps on everything.
I think you'll need a pretty efficient setup with high mah batteries to do 30 minutes non stop in a truggy. We've only had one 30 minute race at our track (electric only track) and I did 26 minutes of it before the LVC kicked in, but my true rc packs were starting to die, because they only took back 6400mah out of an 8000mah pack.
I'm pretty sure Aangel was doing 30 minutes with his 4s 8t, but I don't know what he did different to me and the rest of the guys at my track. Maybe track layout or driving style?

I think Sower was the one who had the 1.5D in his Crt.

If i could do 5s, I'd keep the 1515/ 2.5 in, but we are running the Nitro rc pro rules (4s limit with no mah limit) the 1700kv of the 2.5 makes mine a bit slow on 4s with current gearing (20/51 maxx/gorilla tranny and 1/8 buggy diffs) I know Mike does pinions up to a 25 tooth. Now if i put a 25 tooth pinion on my truck, I would be geared at 36 mph, but i'm sure it would be too much gear to pull. I know the motor pulls hard, but i don't think it could handle that. pinion to spur is 2.04:1 and total is 11.6:1 figuring in 5.8" tire and no growth added. Thats got to be too much for the motor to pull. Might be something to try though, it doesn't get hot and the brakes can be harsh with the 20 pinion. As far as batteries go, I'll run maxamps 8000 2s packs in parallel, or custom made maxamps 10,000 2s 2p packs. weight will be around 10 to 11 pounds

Patrick · 02:46 AM

The most gearing I've had on mine was 46/17 or 11.63:1, but that was speed runs on 6s, so it had more power to push the gearing. I'd say it would be a bit sluggish on 4s for racing.
For racing on 5s I've geared it between 14.1:1 and 16.5:1. It had a lot of power with 14.1:1, but my fastest times are with 16.5:1 (calculator estimates ~33mph) so top end isn't that important to me anymore.
If I get to try 4s tonight it will be geared at around 13.2:1.
Actually I did try 12.5:1 on 12 and 14 cells nimh once in my maxx around 8 months ago. 12 cells was a bit slow, but 14 cells seemed ok if you don't need the most powerful car on the track.

crazyjr · 02.29.2008, 01:20 PM

One thing i know about the Neus and brushless as a whole, they like a good load. Whether its a HV (4-5s) or low v(2s-3s) there is a point where things are just right. On my E-gt, I'm running a 20/66 on a 1200XL on 5s, its got power everywhere but geared to about 30-35 MPH. I could gear up but its fine here. From 4s to 5s With the G2R it's like two different cars, 4s os ok and runs fine, 5s is like a catapult, it just rockets. I'm wondering if i gear it up, will 4s be a rocket as well? just throwing it out there.

pipeous · 02.29.2008, 06:10 PM

You could contact the race director for the event and discuss pitting options. Maybe you could just do one stop with a battery swap at halfway in lieu of fuel stops? I don't think anyone would object and it widens your choices.

"Electric Monster Truck conforming to the rules of this class will be allowed to participate. That means they must meet the minimum weight. Electric trucks must make pit stops during mains. The appropriate number to be determined at each event which will be equal to the majority of the stops required by the nitro powered truck."

Again it is worth contacting the director about the 5s issue with your truck. I can't speak for him but
"1. All Standard MT's will run in the same class. Big block/small block is no longer an issue, larger displacement engines have a heavier minimum weight to compensate.
2. If a truck is modified so it does not fit these rules it must run in the Arena Truck Class. The RC Pro official will make the final decision."

as long as you state your case to show a fair compromise to running with the nitros, then you can work with it.

crazyjr · 02.29.2008, 11:32 PM

While i do plan to race in the series, the MT project will probably be raced next year. Thats why i posted this thread, for those who want to show the smokers what its about.

On the 4s rule, I understand its to level the playfield and give everyone a chance to compete. Besides, I want to beat them without any excuses, or handicaps. I'm doing the research and testing this year so i can do it right next year, not to mention, I don't have the funds to buy 3-5 motors for testing. I guess its time for a sponsor

. I have talked to The Ga state director, He is a good friend of mine and owner of our local track. He said he would forgo the mandatory pits, if it took a good bit to change packs if needed. That's cool, but i plan on some Maxamps custom 10,000 2s2p packs so i see no problem with making time. Thanks for the info and everything will be taken under advise and selected, as i need for my setup. I am still trying to find out exactly what is legal and what is not, as far as the electric is concerned. The rules are saying i need a 2 speed, but most conversions are single speed. I am also trying to figure out if the gorilla chassis will be legal, not for the motor, the batteries. They sit very low and many would think its an advantage, I want to know before they complain to say its legal

Patrick · 02.29.2008, 11:46 PM

I didn't get to try my 1515 2.5D on 4s last night. One of the other guys was looking at getting a neu 1515 and was thinking about the 2.5D, so we were going to put his 4s batteries in my car and see how it goes. But he decided a couple of days before to go with the new 2D wind (2050kv), so he didn't need to see how mine went anymore.
Another racer said he was going to get a 1515 1.5D (2700kv), but I haven't seen him for a few meets. It will be interesting to see how the 2700kv and the 2050kv 1515's compare on 4s. I've never seen a 1y though (2200kv).

crazyjr · 02.29.2008, 11:59 PM

Quote:

Originally Posted by Patrick

I didn't get to try my 1515 2.5D on 4s last night. One of the other guys was looking at getting a neu 1515 and was thinking about the 2.5D, so we were going to put his 4s batteries in my car and see how it goes. But he decided a couple of days before to go with the new 2D wind (2050kv), so he didn't need to see how mine went anymore.
Another racer said he was going to get a 1515 1.5D (2700kv), but I haven't seen him for a few meets. It will be interesting to see how the 2700kv and the 2050kv 1515's compare on 4s. I've never seen a 1y though (2200kv).

Do me a favor, if he shows up again with the 1.5d. get the gearing, temps and runtime and what batteries he is running, this will help me decide what to run when i go to start with this