Andyrt200

I can’t remember if I ever did put the tamiya putty in anything in the end, I’d forgotten everything I’d put on this thread so thanks for finding it! The diffs them selfs have held up fine, I went for a little less in the Thundershots diffs (I may have put the tamiya putty in that). It probably would have worked fine but it has done a badword of a lot of speed runs with an eventual best top speed of 61mph however there were a lot of crashes, exploded tyres, lost drive shafts etc in that time, I guess crashing at 50mph can theoretically see the wheels ending up spinning at up to 100mph in opposite directions. So not too surprisingly most of the putty had escaped from those diffs, seemed to come out behind the drive cups though so doesn’t cause any issues just obviously much less locking effect after it’s escaped. I just put that back together with a normal brushed motor for a bit of regular bashing & it’s still running well. I did try speed running all the cars, most didn’t get too much over 40mph & the putty stayed in fine doing that. The Xtream & Super Blackfoot diffs still have just the same amount of locking as they did after it had settle down from the first couple of runs. They don’t snap drive shafts anymore than I remember them doing before. So the in summary no ill effects at all from the diff putty, it makes a real difference in the Blackfoots having stoped them getting stuck many times. It just a shame you can’t use it on the original Blackfoot diffs. The Super Blackfoot its an amazing basher though it just keeps taking the punishment while the original has to come in for repairs after almost bashing session! The GF01 was a constant nightmare in terms of snapping Drive shafts, I built it wide with WT01 parts from new so it uses those shafts. I posted on here some time ago about that & got a good tip about different drive shafts to use it hadn’t snapped one since. It is starting to snap the middle axle out of the chassis now so has been shelved till I get round to fixing it. That’s more to do with jumping, brushes motors & the wide conversion than diff putty though I think though.

http://rover.ebay.com/rover/1/710-53481-19255-0/1?icep_ff3=2&pub=5575378759&campid=5338273189&customid=&icep_item=264818521283&ipn=psmain&icep_vectorid=229508&kwid=902099&mtid=824&kw=lg&toolid=11111 Hopefully the add has it all....

Oh I miss this on first look, any info for 13Ts? I only had a steel 17T & couldn’t find anything smaller in steel. Mind is currently running a standard 15t but is too fast brushless & over heats 540s on grass with the slightly bigger Boomerang wheels. I’m looking for a steel 13T now.

Good to see another coming out of retirement. Its a great car to get running again. Once you have replaced all the black plastic parts with new its a really tough car. The blue parts seem to be indestructible! I have rebuilt mine a few times over, last time I checked the only part you couldn’t get new was the front bumper & body. Hence mine having a different one. If you get really carried away with the mods you’ll end up here That’s son driving it at 61mph, he was 8 or 9 then! He started at 2 with my Hornet I rebuild it for him with a 360 motor to slow it down. There are loads of videos of it crashing at around 50mph it drove away from most of those crashes. If I’d have stuck that wing on sooner there would have been a lot less crashing! This is all with a 17T pinion & Boomerang wheels as I was going for max top speed 2s lipos with a 4300kv brushless motor sees about 30mph (probably too much for daily use!) 3s lipo, 4300kv well into the 40mph zone, just about to 50mph 3s lipo 5200kv high 50mph zone 4s lipo 5200kv got that 61mph & a fried brand new 120A ESC! We stopped trying there as it was costing too much! I’m looking to slow it down now for general bashing but won’t hijack your thread for that...

Is it a GF01 that’s spitting them out? You reminded me I have found them not broken before, but I’m not sure which car they were from. I think it was probably from snapping something so the driveshaft could easily escape, probably Thundershot a long time ago, broken too much stuff over the years to remember!

Yes sorry probably should have said that, it took me a while to work out that was the issue. To start with I thought they were getting bent by hitting things till I noticed the ends didn’t line up any more, the bending come from the twisting. My Thundershot has the same drive shafts & tends to bend them a lot more like that with it having smaller wheels. I think I’ve actually only snapped one in that in all our many crashes getting it up to just over 60mph for the speed runs! The WT01 isn’t too bad really it not that often it snaps them. It’s the G6 with them in that’s the main problem. The three “axles” are obviously all joined by the gearbox so there isn’t even a prop shaft that can give a bit, you often land front or back first so have the momentum of the other two axles still spinning added in too.

No binding, it’s mainly landing a jump still on full power with brushless motors, I just heard one snap as my daughter did it. She’s of average skill & takes some encouragement to drive them anyway so I don’t want to put her off. My son on the other hand has been perfecting his control of them in the air with the throttle & managed to combine that with coming off the power on landing & didn’t break any. Having quite a bit of diff putty to give it a stiff LSD effect is hard on the drive shafts too. My Super Blackfoot used to snap its drive shafts on every roll with a solid locked diff.

Perfect thanks, I’ll give those a try then

We have just been bashing the CC-01 & CR-01 over the winter they have enough mods to just keep going now, so I haven’t been on here for a while. I did get round to at least getting them all on display With lockdown, lots of space at home & our own track we have been getting the others out more. My sons wide G6 keeps snapping drive shafts on hard landings though, it often will snap three at one time, it’s getting silly & I’m running out of spares! Am I going to have to be boring & take the brushless motor out or are there any uprated drive shafts for them? (Being a wide conversation its running WT01 shafts) The WT01 seems to cope with brushless power in general & goes a lot longer before maybe snapping one driveshaft. Also I haven’t looked very hard yet buy the parts tree with the body mount seems to be unavailable now, is that right? Sorry I expect that’s been covered before, but as I said I’ve not had time / cause to be on here for a while.

My original has had the frog drive shafts since the Frog re-re came out. I found shimming out the drive shafts can cause the suspension to bind mid way up when the distance between the wheels axles & drive cups is shortest. I converted the trailing arms to run on bearings so they move more freely but are held in place much more firmly. The plastic pivots wear over time allowing the trailing arms to move out so the drive shaft pop out even more frequently with age. Its a bit of a fiddle, the smaller (850 I think) bearing fits the thin end perfectly but I had to make a spacer out of an old hornet gearbox for the fatter end. There is a bit of old TX arial to to keep the inner bearings held in against the outer, the outer is braced with a washer against the stock end cap with hole drilled very carefully in the centre. The bearings have to sit in the exact perfect place to be held tight so everything needs cutting very accurately. I also cut threads onto my new shaft the bearings sit on just to hold it in place, but that’s not essential, it only needs to be held in place, push on star type fixers would probably work for that too. With the old frogshot diff mod it works very well! https://youtu.be/9GJyslBQB2I

Great thanks. Seems the TS4N is the best of the lot then, still a good few spares for them on eBay too. Shame we have limited on road road places to drive! The kyosho chassis will go straight on eBay then, try to get some money back, think I paid too much. Seems the Trax isn’t worth much at all. I wasn’t planning on selling it but was just checking the prices of sold trucks & found whole working trucks have sold for less than people are asking for just the engine!!

I’ve never tried Nitro cars before, had some aeroplanes back in the day but apart from engine tuning they don’t have a lot in common. Having only really ever had battery powered Tamiya cars all my life I don’t know much about this lot I just picked up locally: The Traxxas is a t-maxx apparently & has a blown engine. There quite a lot of info about those about. The other two I’ve never heard of, here they are with the bodies off with the HPI & a Kyosho that didn’t come with any bodies. The red chassis seems to be a thunder tiger TS-4n it looks reasonably intact apart from the engine not being in it. They came with a box of engines but I suspect there will be something missing from the drive train! This one I can’t work out: Shame about that front suspension arm, maybe find one from a tamiya to fit? Looks like it would run apart from that. The HPI Looks ok, shame about the parts supply! Seems to a Rush something, maybe Pro? Don’t suppose it really matters if you can’t get the parts anymore! The Kyosho was a 4x4 but it looks like the grub screw from the prop shaft came loose & destroyed the input to the front gearbox. It has an engine in the box that looks ok. Any known what kit is? Just trying to work out what to try mending & what to just sell on for parts.

The part 2 thread sounds like a great idea, so glad you put your hand up @speedy_w_beans I really want to try to get my original Blackfoot up to 50mph but my better half seems to think working on the house is more important for some reason at the moment... Thanks again @Jason1145 my son & I had such a blast running all our cars for this thread

Unfortunately this hobby does take up a lot of time, fitting it in with home life & a young family can create some issues. A break is sometimes needed, my batteries are all in storage at the moment & the cars safety tucked up, I wouldn’t sell any of mine but I think Jason was often changing cars in his collection. Hopefully someone else will be able to keep this thread going, it’s a brilliant idea!

Maybe not! I was doing some testing with the clearly not working new 120A ESC & found the old trusty 60A suddenly wasn’t working on my only 3s pack, but was fine on 2s. It seems the connections were dirty on that 3s, the 60A started working fine again with it after cleaning them up. I guess maybe is was arcing a bit on full power on my last try.

No official entries unfortunately this time, we did take the Clod with us to the beach (not really has it out since getting the CR-01) It got a blistering 8.7mph but then we found it got 9.1mph in reverse! Could have been a good comedy entry but I’ve wasted enough of Jason’s time already I must have fried my new 120a ESC on its first outing last time in Thunder Shot (at least it pushed it past 60mph). I only found out testing things as we were packing to go back on holiday so it was only Blackfoot to try back on 3s. The fastest its run was 49.1mph but the diff was slipping then so I was hoping with that fixed it may have run faster. Our previous visit was the next try with the fixed diff, it got a few good passes in till the roll that snapped the wheels axle (halfway through the video below). While fixing that I swapped the 19t pinion for a 16t when I realised how much higher geared it was over Thunder Shot, that ran 57mph with the same 5200 motor & 3s. Just for reference (not taking tyre ballooning into account) this should be the motor speed at 50mph: Thunder Shot is 33,000rpm Blackfoot with 19t is 23,760rpm Blackfoot with 16t is 29,040 rpm The second half of the video is with the 16t pinion: Both the 16t & 19t got almost identical 48mph speeds! I made that video for myself really I wanted to listen to the passes back to back as there was clearly something very wrong by the end, you can hear & see it pulsing on the power. The first 16t run was a high 47mph but that was it, it only ran the 48 when we tried tweaking the trim throttle trim up a bit as I had a feeling it wasn’t getting full power. All the other runs got progressively faster by a good few mph as things warmed up usually 3rd or 4th being the fastest, so I think there is probably something wrong. It’s the same TX / RX & ESC so the end points shouldn’t have changed. The ESC has done a lot of passes in different cars so is probably getting a bit tired. It did smell a bit nasty at the end of running. But it ran very well on 2s for a good bash right after. Not sure what to do next, I really want to try to get the truck up to 50mph 4s would do it, but it's kind of fun to try more with 3s!

That motor looks nice obviously get what you pay for, but a bit out if my price range, you can get 3 separate sets of 3s safe GoolRC motor & ESC combos for the price of that motor alone. It would be interesting to see what difference there was when hooked up to the same battery in the same car, but I’m not spending that much to find out! Interesting about the wing I was thinking it’s probably more the sides of it stabilising the air flow than the rear tires being pushed down, out of all the cars I have in first page (about 8 I think from memory) it was only the Blackfoots that’s went straight every one of the others were a nightmare! The wing I stuck on this time is a 58416 from a Rising Fighter, I checked my back order history, @Jason1145 you’re right speed running does cost a lot in parts

It would probably be easier to just pick up another used car with a body really. It took a couple of old cars to build it in the first place, I never actually had a proper body, it was a mates car I swapped for a swamp boat I made back in the day. It was just a basher that turns out to be good at speed running. Of course speed running had lead to it being rebuilt a couple more times with all new parts by now! Looking a pictures of Thunder Shots there seem to be quite a few with big extra wings on very much like the one I stuck on but the instructions don’t show it. I don’t think the one that is integral to the original body would do much. On a different note, out of interest are those Castle motors 2 pole? I imagine the 50k limit of the GoolRC ones is the electronics pulsing the magnetic field round the can. Its vaguely interesting to see every one of their motors has the same 50k limit & they are all 4pole.

Interesting, thanks! I’m lucky my uncle gave me his old lathe when I was a teenager, but I probably wouldn’t have thought about using it for that without you saying. Though I won’t be doing it for speed running! Thanks, we were pleased! It is kind of a Triggers broom of a car but it’s been rebuilt using all stock Tamiya parts (less the shocks) so still really the 30 odd year old car in design at least so chuffed it can cope so well with going that fast, with the wing on at least. It’s a shame you can’t get the proper Thunder Shot bodies any more it would be interesting to see if the wing on that actually worked. I’ll stick with the proper Tamiya pinions in Blackfoot for now at least, would be interesting to see how fast it can go on 3s first, I’m sure the 19t just too tall. Also I think we may have cooked the new 120A ESC already, we were only bashing on 2s & it was smelling nasty. I stuck an old 60A & it ran much better. The Castle motors sound good, but we’re not even getting to the 50k limit of ours, I think I’d need some special batteries for that & I don’t want to spend that much!

Great thanks! Slowly creeping up, not sure it will get much faster now. I may try running on an empty road now it drives much better just to see if sand slows it at all, but I’m not sure it will make any difference. Thanks for confirmation on BF pinion drilling, I’ll try a smaller one on the 5200kv then Good luck with the Rat, I still love that car! Let me know when you have finished the time machine, I could really use one too

Official entry:  Thunder Shot (Super Dragon body) 4x4 17t pinion  5200kv 4 pole & GoolRC 120A esc (you could warm your hands from the heat being kicked out by the big ESC fan!) Boomerang wheels & tyres all round.  4s lipo (2 regular 2s in series) 61.1mph or 98.3kph It was good to see how the wing really made a difference, last time I bodged one on & fitted a high torque servo & saver at the same time so didn’t know which made the massive difference to keeping it under control. Previous best on 3s with 4300kv was 50.3 mph & with 5200kv was 57.4. The talk of KV ratings & batteries over the last few pages was very interesting. My 3s is a little 2200 but 65C/130C where as the two 2s batteries are 4000 30C/60C. We started out back with the 4300kv motor as its max voltage is listed as 12v & the 5200kv is only 9.6v so I was worried about killing the 5200kv. But we only got 56.8mph with 4s on the 4300kv so I put the 5200kv in & nothing melted! Looking at their ratings sheet it seems they just listed the max voltage to give the 50,000rpm no load limit: Its the first few rows (3650 motors). I had just been going for bigger is better & just try it up to now but thought a bit more simple , (if slightly backwards) maths could be used, please correct me if I’m wrong: So I measured with Thunder Shot that the motor does 25 revolutions per meter. Then at 1m per second it will do 25 rps, or more usefully x 60 = 1500rpm 1mps is 2.2369mph so 33mps = 73.8mph So at 73.8mph the motor should be doing 33 x 1500 = 49.500rpm So even with a bit of wheel spin on the sand & ballooning tyres it’s not going to be far off max RPMs. However Blackfoot with its 19t pinion from the Frog gear set is only doing 18 revolutions per metre, so works out at just about 100mph at 50,000rpm, but with the same 3s & 5200kv motor has only managed a best of 49mph when Thunder Shot got 57mph with lower gearing. Unfortunately Blackfoot rolled & snapped a new wheel axle on 3s before we could try 4s. But I think I should probably drop down to an 18T or even 16T pinion before trying again. Or just shove in one of the 3674 motors! (Though I think my batteries may be the limiting factor) But all the longer motors have a 5mm shaft so would need the Tamiya pinion drilling out to fit it & I don’t think that would fit with the rules?

The Clod is the only car we haven’t really tried with yet, it was my excuse for getting a second 4300kv goolrc set but I didn’t ever put them in it. I did stick twin regular ESCs in it with a Y lead (after melting the original single ESC in a stupid accident). With the same big 2s lipo & silver cans it ran a lot faster & was a real handful, very hard to stop it wheeling. However when I checked properly it was only actually doing about 9mph so I didn’t bother even entering it! I’m flat out busy rebuilding 1:1s at the moment so haven’t got time to play with it right now nor had a chance to look on here - sorry, but glad to see you have all been getting some great runs in, was fun catching up! I did pick up a new 120A goolrc ESC that can run up to 6s (& it came with programming card that works on the 60A ESC too). I found time to stick a new diff in Blackfoot & made a proper detachable wing for Thunder Shot for some testing last weekend, unfortunately the weather was very bad so we didn’t have much time for running or trying the other cars with 4s, but we got it running in Thunder Shot, I post up the official entry later when I’ve up loaded the video.

Thanks, yes as you said after our very first go with Tshot in a little carpark you need more space. Thanks hat beach is a bit special, as I’m sure a lot of people find it’s often the slowing down under control that is the problem. As you say its the curbs on roads that kill the cars as well as traffic you need to suddenly avoid! Its about 80 miles from our house down country roads so is driveable in a day but. Its much better if we are staying over as it gives time for over night tuning, I’d have never got that run in one day, as that the only place to safely test too! There is an industrial estate about half an hour away I may try Blackfoot at some time after I’ve rebuilt the gearbox again. I’m only going to keep Tshot & the BF as speed runners now, I should really put my TT-02 high speed gear sets up for sale...

It’s taken the best part of a year to actually get my Thundershot to drive properly at speed but I finally got there last weekend! It’s been taking a heavy pounding every session, it needed all this after the last try Its only the blue suspension arms left from the car I started with! I was hoping the new wheels & tyres would help but as you can see from the first few clips on the video it was still bad. We tried running it first on the Saturday (the first clips) but decided to quit before it got broken again & concentrate on Blackfoot. My boy was so pleased with Blackfoots run he really wanted to try Thundershot again, I’d about given up with it but luckily listen to him! So the next day he persuaded mum we should go back to the same beach. I took the high torque servo & saver out of Blackfoot & fitted those as the only play left in the steering was in the standard servo horn & saver. I also knocked up up a quick wing to try to give the rear a bit more stability, it worked a treat with a 55mph run on the first try! The only minor issue was keeping the front wheels down, but that was only when he was out running the dog! I have a bit of ally pressing the front bumper down that seems to keep the front down when you’re not accelerating too fast. It was just as well it didn’t roll, there was no way my “BluePeter” wing would have survived! Official entry: Thunder Shot (Super Dragon body) 4x4 17t pinion  5200kv 4 pole & GoolRC 60A esc (everything did get quite warm this time!) New Boomerang wheels & tyres all round.  3s lipo 57.4mph or 92.4kph (Previous best with 4300kv was 50.3 mph) My boy was asking if there was a faster motor we could get as soon as we had that run in the bag! So I told him we will think about 4s over the winter...

We managed to get one last unexpected trip in to out favourite speed run beach. So did actually get a few decent runs in this time, Thundershots will follow but here’s Blackfoots for now. Official entry: Original Blackfoot RWD 5200kv 4 pole 3s lipo 19t pinion (frog gear set) 49.1mph, 79.0kph My rear suspension running on bearings is keeping the frog drive shafts in fine, but it sounded very much like the diff was slipping even with the frogshot M2.5 bolt mod, I think that robbed some speed but at least it ran this time! It just sounded worse on the runs after & didn’t go any faster so we had to stop.