HPI Nitro RS4 2 - 2 Speed Transmission 

Well, I’m really glad you enjoyed the vid 💯 - It’s awesome that you kept your nitros and would be great if you were able to get them going again! Let me know how it goes. Would love to get an update at some point. The OS CV engines were/are great! I’m not sure if you had a chance to see the latest upcoming, Volume 4 engine overview short yet or not but, we will be going over a Gold headed 12CV Hyper soon. I agree, modifying one would be fun and interesting! I appreciate you taking the time to write and for watchn’ 🩷

Ohhh 😮 That’s awesome! I agree, a race clutch is a great upgrade - It is always better to run with friends. Makes the hobby that much more fun Thanks for taking the time to write and for watchn’ 🩷

Hpi, especially older HPI cars/trucks are great ‼️ - That’s awesome that you have your first RS4 and to make it a 2 speed, will be even better. Let me know how things go 💯 I appreciate you watchn’ 🩷

Actually I accidentally bought a Rs4 sprint 2 cause it was selling for $80 and as rc enthusiast as we are I went for it.

@@713Ace529 Nothing wrong with another RC 😋

You are welcome and I hope it helped a bit. - I assume that you are a belted Nitro RS4 fan as well? 💜 Thanks for the comment and for watchn' 🔥💪

Sorry for the late reply. Missed it when you made it - Thank you for watchn' and for the comment. Bondhus has made some nice tools over the years! Thanks for letting me know and shout-out to everyone in MN

Thanks! I see Wiha is here too in Monticello, MN and they are building a new big facility as well currently. Just realized.

Thx Ron ‼️ Appreciate the comment and for you watchn’. - Do you have a 2 Speed on your RS4 ?

@@a2rc Yes Sir, I have a 2 speed on both of my RS4’s. Just by watching your videos give me confidence of not being afraid to tune and do minor adjustments.

I assume you are asking about engines like OS 15CV-R (let me know)? I have been using the “black” spring in the 2 speed trans for 15+ years now and it works great for the 15CV-R. - We will have some more vintage engine adventures in the future 💜 Thanks for watchn'

Hi Christopher. Thanks for a great question 💯 - Both the shaft and belted RS4s use 1M gearing so, they both technically can be used on either car but, they both use different ratios/gear sizes. So you can use an “evo” style bell and pinions on the belted cars but, you may need to change the pinions to a more suitable gear ratio/tooth count (and viscera) - The shaft cars use a lot bigger spur gears due to the final drive ratio. Some of the parts within the trans can be used on both types of cars. So, not everything is interchangeable but, it’s nice that some parts are. Hope that helps a bit I appreciate you taking the time to write and for watchn’ 🩷

I'm going to find out soon. I'll get back to you on that!

Howdy Marcel. Are you looking for RS4 3 gearing? Which car are you working on? - EBay seems to be the best place to find vintage HPI parts. You just have to keep an eye out Thank you for watchn’ 🩷

I'm not sure but I think it's the HPI Super Nitro RS 4 2 I could send you a picture? I live in Austria and couldn't find anything online in all of Europe.@@a2rc

Hi and thanks for the question. - Well yes and no. The 2nd gear clutch, bell and gear adaptor is the same but the shaft, and gears are not (the shaft driven rs4 3 has a different final drive ratio so, the trans uses different gearing). - So, yes some parts can be used but others can’t. So to be fair, I wouldn’t go as far to say that the Evo trans will work in the belted rs4. - Nonetheless, you bring up a good point that a few parts between the version can work on one another. Thanks for watchn’ JD 🩷

@@a2rcI have the RS4 3 2-speed transmission on my 1st Gen Nitro RS4. The only thing that was different was the main shaft and the “heavy duty” 1st spur. I also used the clutch bell housing that lets you change the gears. I did this cus most the original parts are discontinued then discovered the RS3 had the same part numbers LoL

I also have the Ofna 2-speed but the plastic gears are low quality and cant stand the .15 CVR They strip and melt in 1 run.

Hi and Thank you for the question. - Since all the RS4 parts are discontinued, you just have to keep an eye out on eBay, FB, swap meets, etc. The cars are worth the time spent looking. - I appreciate you and everyone watchn’ 💜

@@a2rc yes they are definitely worth the time. One more question if you don’t mind. Are any of the transmission parts interchangeable especially spur gears?? Thank you for your time it is very much appreciated..

@@mach389 I think what you are asking is, if the different versions of the Nitro RS4s are interchangeable (correct me if aim wrong)? - The short answer is, yes spur gears can be interchanged between versions - The long and maybe more important answer is, it depends. It first comes down to gear ratios and then also, gear version compatibility. - One example is the first version of the 2 speed that came out for the belted RS4s. The 1st gear spur version and one-way bearing is different than the updated “heavy duty” version. You can use the 1st version on a RS4 2 with the updated trans if needed/wanted but, you have to have both the original gear and one-way, as an example The Super, 1/10 RS4 and Nitro Mini can use the “Same” 2 speed transmission but, they may need different gearing. That depending on what you are trying to do with the car and/or attempting to archive the recommended range of gearing for the scale/tire size/final overall gear ratio. Then when talking about the shaft driven RS4 versions (RS4 3 Evo, Evo+,etc), some parts of the transmission are the same as the belted trans. The 2nd gear clutch, clutch bell and 1st gear “gear adaptor” are the same but, the original gearing, shaft bearings, etc are different. - The original gear sizes of the RS4 3 are different because the diffs and overall gear ratio of the drivetrain is different (compared to the belted car). So if you just use “whatever size” you want, the car with “work/roll/drive” but maybe not at its peak performance. So, understanding and thinking about what you want from the car is important when selecting Spur/clutch bell pinions for your car gearing. - It can be a lot to think about but, that’s apart of the fun. Learning about how gearing interacts with overall cars acceleration or top speed or traction, etc is apart of the fun/hobby. - They are truly scaled cars and that’s what I fell in love with so many years ago 🩷

@@a2rc thank you so much. Keep up the great work. 👍👍

Hi and thanks for the great question! I'm always happy to help where I can Clutch bells and spur gears are getting harder to find but, the best place to look will be ebay atm. - Gear teeth do wear out over time (that is normal and having spares are a must) but, the main cause to worn/broken teeth is Mesh (improper alignment and/or becoming loose while driving). Making sure you align your engine and also, having a proper mesh is key. - Use of clean new engine mount bolts and blue Loctite is what I always suggest (each and every time you take your engine out). If you loosen a bolt then, replace it. Stripped heads, broken bolts, engine movement while running due to bolts coming loose, etc can become a bad thing (on any model) Other things can "hurt" your gears and drivetrain. Like rocks (clean/blow off your road before you drive), higher power engines, high grip tires, loose, worn and broken chassis/drivetrain components (normal maintenance is very important), etc. I hope that helps a bit I appreciate you watchn' and taking the time to write 💜

@@a2rc thank you very much for the soon reply, despite english is not my first language, you came to understand pretty well what I meant, you are right I remove the engine and probably tighten and alignment was the issue, just to be sure; is there any video about how to perform a proper mesh?, I had promised to myself that I will make my car works just fine again, thanks one more time 👍🏼.

@@leonelcardenas-sj9fo I do not have a video yet, of the Belt RS4 on Gear Mesh but, I have a good video on my Mantis GP Kyosho Mantis Nitro GP 1/10 Rebuild - Gear Mesh and Mantis Upgrade Sneak Peak ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZKzbksahHhc.html You can watch the whole video or start watching around 8:10 - I like to use the "paper method" for gear mesh and I walk you through the process and provide some tips along the way. Let me know if that helps you a little more.

Hey Jr. Thanks for the question. It’s great that you have passion for vintage nitro touring cars too. - The Spacer part number is B070 and yes, you would use the stock needle bearing with a little bit of grease (part number B046). You are welcome to use 5x8x2.5mm ball bearings as well. A tip would be to use a flanged bearing at the end of the bell to help keep it captured (you can also use washers). - I hope all that helps you with your build and thank you for watchn’ #NitroIsTheBestGo

@@a2rc awesome! Thank you so much for the help! Much appreciated!

it's been a while since I looked at mine, but I believe I'm using flanged bearings and not the needle bearing. As for spacers, I couldn't tell you but it was definitely HPI branded spacers that I had laying around.

@@InTheZone85 thanks, I got the flanged bearings for mine.

They Harvz. Thanks for the question 💯 - Best place I can direct you is eBay. At times they can be hard to come by (especially in good shape) so, just be patient. I hope you get yourself a hold of one soon. Thanks for taking the time to write and for Watchn’ 🩷

It all depends on the power of the engine and the final gear ratio for the car. the 2 speed will help if the engine doesn't have a lot of displacement for low end torque but, the single gear set-up may allow for a taller top gear. Maybe pick the Single gear set-up and get it a try and if that shows you need some bottom end (maybe you dont have enough run way for example) then you can try the 2 speed. - Thanks for the comment and for watchn' ‼

Thanks for the video. Your doing a great job. We're are u getting your parts from?? We're can I get the black gear from?? Were did u get the 2 speed from??

@@edgardojagr216 parts aren’t always available but, eBay is a good starting point. Hope that helps

Great videos, good to see more old school rebuilds. What springs have you found that work with the higher hp .15 engines?

HPI king of touring cars

Hi and thanks so much for the Sub and watchn’ 💜 - The best place I have found to keep an eye out is on eBay

Hi and thanks for watchn’ 😁 Yeah I have considered it but, they do not hold well and are not perfectly “round/Concentric” on the shaft due to the printing and curing process. So they provide and “option” but, the stock injection molded gears are the way to go.

Availability and condition does vary but, the best place to look is on eBay - What part of the world are you in? Thanks for the question and for watchn’ 🩷

Miami FL.

Can’t seem to find any… I believe it was part #72516

@@dannymontalvo7623 Availability can sometimes be a roller coaster unfortunately - It is defiantly a hop up worth getting 💯