OK, it's done. 64mph Rustler. 23/84 gearing.

[mtrsprt]

Well, I think I may stop here.
I changed the pinion out for a 23T(I couldnt get the darn grub screw out of my 21T).

Took it out to a road where I had about 900-1000' of stretch.

Boy, its weird trying to start the truck off that far away. Seems the signal gets a little corrupted, and it likes to accelerate way faster than what you have your throttle finger doing on the trigger.

Stability was actually not bad. I let it get up to about 30mph Id say, and then rolled ont he throttle steady. After it was close to top speed, I just let it coast, and fortunately, it just spin out, instead of flipping like it usually does.

My calculator says with the 23/84 gearing, speed should be about 72mph, but only if the motor can reach the desired RPM. I may have been climbing slowly, but was getting pretty far out.

I am very easy on the take off with the whole rig being stock. I do however, have an aluminum idler coming in the mail, along with 4 HPI Geolandar tires, with Clawz white wheels.

IMO, on 12 cells, with good conditions, this setup could definately hit 70mph. The packs I used were Trinity High Voltage 2 packs(unmatched), running together in series.

18.61K
12 cells (unmatched)
Lehner Basic 4200
Bone stock Rustler
23/84 gearing


http://img.photobucket.com/albums/v4...Rustler001.jpg
http://img.photobucket.com/albums/v4...Rustler005.jpg


Please keep all images to a width of 600 pixels or less. To do this, you must edit the image using an image editor before you upload the picture to your host.

I have changed the images to links so that people don't have to scroll to read the thread.

Mis'

[rustler 2x4]

How can you estimate speed based on the gearing?

[mtrsprt]

Use this calculator.
http://www.radiocontrolzone.com/cars/calculator.asp

You need to know your FDR, tire dimater, and amount of RPM's the motor can possibly reach.

[hobbyguy252]

whats with the stock tires? wouldn't they give you less traction than if you bought a better pair (like road hawgs or something?)?

[kschauwe]

Originally posted by mtrsprt
Use this calculator.
http://www.radiocontrolzone.com/cars/calculator.asp

You need to know your FDR, tire dimater, and amount of RPM's the motor can possibly reach.

Those speed calculators are bogus. You don't know how much the tires balloon at speed and what the motor speed is under load.

[Frailcow]

Originally posted by hobbyguy252
whats with the stock tires? wouldn't they give you less traction than if you bought a better pair (like road hawgs or something?)?

Originally posted by mtrsprt
have an aluminum idler coming in the mail, along with 4 HPI Geolandar tires, with Clawz white wheels.

[mtrsprt]

Originally posted by kschauwe

Those speed calculators are bogus. You don't know how much the tires balloon at speed and what the motor speed is under load.

Aparantly do not know how to use them. They are pretty much dead on, exept for ballooning factors. I have been using them, along with my GPS unit, for a few years now, and 9 times out of ten, the calculator shows speeds within 3-5mph of eachother(GPS). Not bad, considering we are talking of speeds in excess of 55+mph.

You cannot do it with brushed motors too well though, because brushed motors loose alot of RPM under load. So it's hard to determine about what RPM your motor will reach, but you can also use the calculator to find out what RPM your motor reached, and then figure gearing and speed estimates.

Ask the veteran speed testers like myself, and they will tell you the same.

[Swami]

Originally posted by kschauwe
Those speed calculators are bogus. You don't know how much the tires balloon at speed and what the motor speed is under load.

I was of the same opinion, and I definitely do not know how to use that calculator. However, Mtrsprt has verified his methods more than once.

Nice work dude!!

http://www.swami-rc.com/speedrecord.htm

Swami

[Swami]

Originally posted by hobbyguy252
whats with the stock tires? wouldn't they give you less traction than if you bought a better pair (like road hawgs or something?)?

You dont need much traction to go fast.

You need traction to go fast quickly

Swami

[Poohblah]

Wow, Swami, you had to update your 60 mph page again!

With all the people hitting 60 these days, the club should be upped to 65 or even 70 mph.

Nice work, mtrsprt.

[outkast187]

the speed calculators are very very close. I used one for my E-maxx, claimed a speed of 55.1 mph and with GPS it did 54. something (within 1mph)

[mtrsprt]

Going for 68mph tommorow.

[dan0512]

wait wait you actually run that monster on 12 cells on a completely stock rusty? lucky your idler didn't bust....

Dan

[RCcarnut]

Very nice work!

GL on 68mph

[dlrumbl]

Links are dead now!

Man, and I wanted to see that thing!!
dlrumbl

[mtrsprt]

Here they are in smaller format.

[_rollin_]

very nice back tires mtrsprt, lol

im jealous i have a 400 dollar bl system and 50 mph , darn.

You dont need much traction to go fast.

very true swami , i destroyed one the hole supension one one wheel byspinning out at 47.6 mph , dumb telephone pole

[mtrsprt]

Yes, those stock tires are now retired. Check out the new ones. They perform flawlessly, and make the truck handle better, and attain stability at any speed.

HPI Geolandars.

[mtrsprt]

Originally posted by _rollin_

im jealous i have a 400 dollar bl system and 50 mph , darn.

What does your setup consist of?

To reach 50+mph in a Rustler with the 5300, you will most likely need 8 cells.

[_rollin_]

mtrsprt,

10 old bad 2400s
24/81 gearing
road rages in rear
stock ribs in front
with good batts that is a 60 plus setup, to much acceleration.

i also thought this might help,
stiffen the rear with preloads,so the backend wont be scraping the ground giving better aeros.
you will wheelie easier but still,
i will be in the race next summer for sure,no money now, and i will be doing 12 cells.
my goal is to get 60mph before i get into high school.
start 7th grade in 2 days , noo

i like those tires too mtrsprt, sorry for long post everyone.

[bob2300NX]

Did I see two stick packs lol!

Very nice setup! P.S. I think I see you on the radiocontrolzone forms, nice seeing you here!

[mtrsprt]

Originally posted by _rollin_
mtrsprt,

10 old bad 2400s
24/81 gearing
road rages in rear
stock ribs in front
with good batts that is a 60 plus setup, to much acceleration.

_rollin_,
There's is something wrong with your setup. With 10 cells(12V) going to the 5300, it should spin close to 63,000rpm. Given your tire diameter(3.6") and the final drive ratio of 9.18:1, your speed(if your motor can pull the rpm)should be about 73mph.

IMO< there's no way your 53000 can pull 24/81 gearing. Maybe you should start with a 17T, and see what happens. Brushless motors like to spin the highest rpm they can. Sometimes using lower gearing can find the sweet spot in your motor setup, and sometimes net faster speeds.

To give you an example. My 4200 motor is reaching about 60,000 rpm for me to acheive 57-59mph. I am running 17/84 gearing, with 4.25" diameter tires. According to the RC speed calculator I use for reference, my speed should be about 57mph with my current setup. With my GPS taped onto the model, I showed 59.7mph max speed, which was probably due to some tire ballooning.

See what you can do about starting your gearing down low again. Your setup should easily hit 60mph with your eyes closed.

[mtrsprt]

Originally posted by bob2300NX
Did I see two stick packs lol!

Very nice setup! P.S. I think I see you on the radiocontrolzone forms, nice seeing you here!

Yes sir. Two packs. Only way to go fast

Yes, I also cruise RCCA forums too.

[bob2300NX]

Originally posted by mtrsprt
Yes sir. Two packs. Only way to go fast

Yes, I also cruise RCCA forums too.

What I meant was I see stick packs not side by side with bushless!

[mtrsprt]

Originally posted by bob2300NX



What I meant was I see stick packs not side by side with bushless!

As long as you charge and discharge both packs equally, they will act as one 12 cell pack. I do this loyally for every set of packs I run.

I also run same cell types in my packs, and most the time peak voltage, and discharged voltage is very very close to each other.

[bob2300NX]

Ok this is my last try LOL. You do know that stick packs melt with even the SS5800. So your setup would be even worse on the packs.

[E-maxxin_man]

So, lets see, the recorc now for fastest Rusty is, 72? Well go for it! I have only hit 54 with brushed motors.

[mtrsprt]

Originally posted by bob2300NX
Ok this is my last try LOL. You do know that stick packs melt with even the SS5800. So your setup would be even worse on the packs.

Yes, but these are not your cheapo packs.

Trinity High Voltage 2 packs, with Panasonic 3000HV cells. They get warm, but not hot hot.

[bob2300NX]

Really, well that is pretty cool. On my post, sorry I didnt mean to make you sound stupid or anything.

[mtrsprt]

No harm taken Bob. I've been in the hobby for about 17 years now, so it's hard for me to look stupid. Sometimes I do stupid things still!

Just turned 30 this year

[E-maxxin_man]

That doesan't matter. its not the age, its the love for the hobby! i started when i was 4, my dad got me a radioshack truck. and now at 13, still loving it. Got my whole town involed with it. its great. You should try some noe 3600 Trinitys that are coming out when they get here... I already got mine back ordered.

[nitroracer87]

what size motor are you using

[mtrsprt]

Originally posted by nitroracer87
what size motor are you using

Me?
Lehner Basic 4200

[Emmett]

i read somewhere that the 3600's arn't a big difference from good 3300's but im not basing that on first hand information.

[mtrsprt]

Originally posted by Emmett
i read somewhere that the 3600's arn't a big difference from good 3300's but im not basing that on first hand information.

I have heard the same. It's not worth spending the extra $ for 300 more mah of capacity. Now...If they were lats say...4000mah, then it might be worth it.

Most of my GP3300 packs take in about 3300-3600mah of charge anyway.

[bob2300NX]

Dont buy the 3600's they have a high internal resistance and vent easy.

[mtrsprt]

My Panasonic 3000mah Ultra Metal packs perform just as well as my GP3300mah packs also.

[nitroracer87]

were do you guys buy this stuff?

[DualBLv2]

buy what stuff?
if your talking about the zip ties, you can find them here

it'd help if you made your question more specific.
-Nick

[nitroracer87]

i know were to get zip ties i meant the panasoni 3000mah ultra metal packs or the gp3300mah packs