100 mph RC8 brushless

[emaxxnitro]

Originally Posted by Rivermaxx

Foams ftw! lighter and able to with stand more speed. I find it hard to believe you got it too go that fast with rubber tires, they usuallly fly apart @ ~60mph causing a crash. How did you check it radar or gps?

gps, got 71mph now but one tire blew out. im using majestic hooks but they are at the limit. also i was able to do wot so thats it for 4s. so what color dot should i get?

[DwightSchrute]

Originally Posted by emaxxnitro

gps, got 71mph now but one tire blew out. im using majestic hooks but they are at the limit. also i was able to do wot so thats it for 4s. so what color dot should i get?

it depends. if you live in a warm climate, you can run with blue dots. if you live in more seasonal weather, go for the softer compound. where i live i can't use foams. there's too much dust on the streets.

as far as getting the 100mph mark, gear up to a 24 or 25t pinion.
the 2200 will get me to almost 95 in my 8ight geared 45/24-25.

after seeing Mike's 100mph run i dropped in the 2650 in and dropped to 43/25.
i didn't have my gps on, but i believe Mike's right about that combo. it's good for atleast 100.

tires holding up is a whole other issue.

Originally Posted by nitrostarter

Also,I would look for a set of the Losi Rally tires. This are good for 105mph for sure.

On the RC8, it is possible to change the F/R diffs out to buggy diffs with the 13/43 ratio? If so, I would go that route as it will be easier to gear for speed.

the losi rally tires good for 100+ (LOSA17768B) were discontinued indefinately.

i'm lucky to have 6 sets of them, which is what i use, but i also have used OverRevo's tire tieing method to use buggy tires to gain some gear and traction when i needed to.

the 1515 1.5D definately wil have the rpms, but i liked the 2650 better because the 1.5D created too much wheelspin for me.(even with the punchcontrol, it just has TONS of torque) my 2650 ran alot cooler for some reason too.

imo it would be kinda unecessary to swap the diffs when they make pinions that will be far more gear than the 2650 or 2700 will be able to use over at Kershaw.

[Rivermaxx]

Dwight have you tried those kershaw plastic pinion gears. Because I am not satisfied they will handle the torque. Bigger gears can handle more torque with out stripping because more teeth are engaged that why the bigger plastic spur usually hold up. I was also told by Nic case to use steel gears but maybe a mod 1 gear is alot tougher than a 32 pitch because of the thicker gears. You guys think a real neu 1515 1.5 d ,castle neu 1515 1y or 2 castle 1512 1y with 2 esc's on 6S each would be better in a slightly heavier gmaxx for high speed setup. Dwight didnt you have a twin brushless revo ?

[DwightSchrute]

Originally Posted by Rivermaxx

Dwight have you tried those kershaw plastic pinion gears. Because I am not satisfied they will handle the torque. Bigger gears can handle more torque with out stripping because more teeth are engaged that why the bigger plastic spur usually hold up. I was also told by Nic case to use steel gears but maybe a mod 1 gear is alot tougher than a 32 pitch because of the thicker gears. You guys think a real neu 1515 1.5 d ,castle neu 1515 1y or 2 castle 1512 1y with 2 esc's on 6S each would be better in a slightly heavier gmaxx for high speed setup. Dwight didnt you have a twin brushless revo ?

i don't have any of the kershaw oversided pinions but there's a guy who runs alot down at our speed place that does. his is run on a 1515 1.5D with no issues at all.

I did run a twin neu 2200 MMM e-maxx, but it was far too much torque for the transmission. i turned 2 sets of diffs and 2 3905 transmissions to dust trying the twin combo.

in order to make it work, you'd need buggy diffs all around and a center diff.....even then, i think it would be very taxing on the drivetrain.

the 1515 1Y's i ran in my e-maxx were good for over 75mph most days with the right gearing and tires. it also had good temps. i could run nearly a whole 6S 8000mah pack without getting too hot.

personally, i think the 1.5D is too high a KV motor for the e-maxx for long running times on 6S. is it faster than the 1Y? yes, but for far less time imo. mine was good for 3-7 high speed passes before i had to let it cool.

if you're going for a speed record, and wanna go for broke i might go for the 1521 1D on 5S or 6S. on the same note, if you wanted a higher voltage setup, i might go with the 1521 1.5D on 8S or even a 1521 1Y on 10S using a MGM or phoenix HV-110. but i wouldn't recommend any of these setups for everyday running.

imo, the neu 1515 1Y is your best bet for an everyday high speed motor.

[_paralyzed_]

I have UE 8 spiders front center and rear on my e-maxx and a 1521 1.5y just sitting on the shelf.

SHAMELESS PLUG: I bought the neu off Nic Case! It's gone 140mph!!!

I just need a 12s esc and 2 6s packs..................... You guys have me thinking....................

[DwightSchrute]

Originally Posted by _paralyzed_

I have UE 8 spiders front center and rear on my e-maxx and a 1521 1.5y just sitting on the shelf.

SHAMELESS PLUG: I bought the neu off Nic Case! It's gone 140mph!!!

I just need a 12s esc and 2 6s packs..................... You guys have me thinking....................

i hope you atleast got him to sign the motor can. that's a piece of RC history!

[Rivermaxx]

As far as going for broke I would like to keep my build on a budjet. I also would like to use an off the shelf castle mmm esc on 6s. As far as making high speed passes I only can get one good run in probably 1000' of space. So I really dont need to run multiple passes. I have UE 1/8 scale diffs and I am sure my g-maxx will weigh less than a brevo. As far as the twin 2200 turning the tranny to dust Thats why I was thinking of running 2 less torquey castle 2650 mmm combos. So running 2 systems on 6s will work then with no sync problems?. I assume you geared it too the sky right? I will put the titanium gears set I have in If I need too. So the drive train I am not worried about. Tires I am getting some custom made ones from bsr put on 23mm wheels hex wheels. I am going to do my initial testing with the 15151y first and then step up to what will work.

[DwightSchrute]

Originally Posted by Rivermaxx

As far as going for broke I would like to keep my build on a budjet. I also would like to use an off the shelf castle mmm esc on 6s. As far as making high speed passes I only can get one good run in probably 1000' of space. So I really dont need to run multiple passes. I have UE 1/8 scale diffs and I am sure my g-maxx will weigh less than a brevo. As far as the twin 2200 turning the tranny to dust Thats why I was thinking of running 2 less torquey castle 2650 mmm combos. So running 2 systems on 6s will work then with no sync problems?. I assume you geared it too the sky right? I will put the titanium gears set I have in If I need too. So the drive train I am not worried about. Tires I am getting some custom made ones from bsr put on 23mm wheels hex wheels. I am going to do my initial testing with the 15151y first and then step up to what will work.

there won't be any sync problems. i tried both neu sets with no success on the 3905 stuff, but it didn't really suprise me. however, twin feigao 8XL's were good.

the twin brushless neu setup with the UE diffs should be fine. I geared mine 54/24 and then switched to mod 1 and went to 36/22 with the feigaos. Still, in the end it didn't make me much faster than a single neu although it still had loads of torque.

[_paralyzed_]

Lube your tranny!!!!!!!! STP oil treatment? seems to work well. (search tranny lube) High speed failures to that tranny are due to heat and a little lube goes a long way (just like highschool)

I still say go dual. I want to see it!!

[Rivermaxx]

I wonder if 2 velineon brushless with 2 mmm esc's can handle 2 4s batts ? Dwight why didnt you should gear up higher and take advantage of the torque. I am sure it would of been faster. Thats some seriouse power with 2 sytems running on 6s.

[Rivermaxx]

Neil we are talking about mod1 gears not .8 or 32p gears. A 25 tooth mod 1 is bigger than a 27 tooth .8 or 32p. Bigger than 25 tooth mod 1 steel gear is almost non existant.

[emaxxnitro]

Originally Posted by Rivermaxx

Neil we are talking about mod1 gears not .8 or 32p gears. A 25 tooth mod 1 is bigger than a 27 tooth .8 or 32p. Bigger than 25 tooth mod 1 steel gear is almost non existant.

a 25t mod 1 gear is huge .
ok i got 4 ofna blue dot foams, losi eight e 43t spur plastic ( lighter than metal )
hpi 25t pinion gear, 6s 30c turnigy lipo, high down force wing. mamba monster 2650.
seem like a setup?

[Rivermaxx]

Looks good to me go for it.

[nitrostarter]

How big of gears do you guys want?

Go to sdp.si.com and go to "Buy Online". Click on the Metric Unit button. Then go down to the option for Gears. Then click on Spur Gears, next click on the suboption called "Metal". Then you should be able to adjust the search functions for 5mm bore and Mod1 specs and voila! Metal gears in Carbon steel, 2024 Aluminum alloy, 303 Stainless Steel. Teeth numbers available: 14,15,16,18,20,22,24,30,36,42,48,54,60,72,84,96.

[DwightSchrute]

Originally Posted by emaxxnitro

a 25t mod 1 gear is huge .
ok i got 4 ofna blue dot foams, losi eight e 43t spur plastic ( lighter than metal )
hpi 25t pinion gear, 6s 30c turnigy lipo, high down force wing. mamba monster 2650.
seem like a setup?

i did 100+ this morning with 30C flightmaxx lipos, 34/25(mike's mod 1 is lighter than HPI, i have both) with green springs all around(you need it to be soft and low) with the 2650. on the mamba settings, 0% punch control, no reverse and everything else stock except i did use the hi-flow ofna wing...that made a big difference in control ability....after 5 passes the 2650 was 128 degrees, the esc was 90 and the batteries 91.

i was also using the losi rally tires. i think if anything stops you from getting 100 it would be wheel spin on the foams.

also, make sure your drive train isn't binding in any way and is very free spinning. that's why you'll need to sand like 1/8" of the face of the 43T to prevent binding the center diff and the motor mount.

i love this setup...i just bought another 2650 MMM combo an hour ago so i could build another. thanks to OverrevO for the suggestions. bye bye to my 1.5D. it had too much torque for me.

I'll get video of it on my day off saturday.