I don't know about you. But for me I check to see if the question was from 5 years ago. But since you brought it up... I can usually charge a pack in about the same time it takes me to do tire prep. ... Which is also about the same time it takes to charge the RX/TX batteries for nitro.

Thanks mrreet2001, your post is most helpful. I just worry that if my kids have to wait on charging battery they will loose interest. Times have change a lot and tech has grown greatly. Today kids are stuck in their phones or on computers, or video games, getting them out side and doing things seems to be hard to do. I just spent $1400.00 on 3 RC cars and I hate to see them just sit in the corner of the room untouched. It is alot of money for just toys. I bought dirt bikes a few years ago and that lasted for a few weeks and then nothing. Now they sit in the garage collecting dust.

I'm kind of glad this topic got brought back to the surface. Honestly ever since I got into this hobby I've been curious about what I could accomplish in the top speed aspect. I remember seeing videos years ago of guys hitting 100mph but they all used big blocks. I always wanted to see if I could hit 100mph with a small block. I don't know if there are any "official" records out there or not. But it's honestly just a personal goal for me at this point.

This is my little pet project. An HPI Racer 2, OS 18TZ, and a ton of hours designing and 3D printing parts. My best speed so far is 92mph (although I don't have any video so I don't expect anyone to believe me.)
My math told me 101mph as a theoretical top speed, I knew that there would be some aerodynamic loses, so hitting 92mph was better than I thought I would hit. I have a bunch of pulleys and belts to swap out in 2 tooth increments until I get to 100mph, and who knows maybe even beyond.

engine been modified ?

Nope, just a box stock TZ for now.

For those who want to know, the fastest nitro powered cars (not RC though) are tether cars. They routinely break the 200MPH barrier. And yes tether cars are still around.

Mr. Pink, I like what you're doing. that's a lot of work. Not sure why you're doing it, but it's your car, do what you want. The easiest way to go faster with a nitro motor is up the nitro content. A good race motor (not the one you have) will easily take 30%, and you can do 40% but you need to do some work. Remember with free advice you get what you pay for, and if you blow stuff up don't blame me

92mph without a modified engine is pretty fast... Send the engine to abmods and you will go over 100mph with the same gearing...

I guess you know by the engines

I've been running 30% in it since it was new, no issues so far (knock on wood).
Yeah, I don't really have a specific goal in mind really, I guess I just watched a lot of people doing it with big blocks but I always felt they were really missing the ball on aerodynamics. So part of me just wanted to try out some aero ideas I've had and having a 3D printer has really allowed me to be creative.
It's a hobby, I'm trying not to take it too seriously, I just enjoy making things.

Nothing wrong with that. I haven't heard of too many people trying speed runs with nitro cars, but there's a big following of speed runs with electric cars.

Many years ago we started running Paved Ovals, bicycle velodromes would allow for racing by rc cars. We were running a .12 nitro motor on a pan car chassis, one of the slowest motors (dynamite pull start). These were easily as fast as the modified electric motored cars. At that time we were dealing with brushed motors and nicads and the nimh just coming out. They would not allow any faster except for "insane speed run vehicles" I think we were seeing 140mph. They wouldn't allow the more powerfull nitro motors for insurance purposes. But we were tuning 9 sec laps (70+). Biggest problem with these are the tires called caps blowing out. But we are talking driving as well as high speed.

Valid point, the nitro aren't as quick as the modified brushless. But... Speed isn't everything, the overall nitro experience is amazing. The problem with nitro imo is there are many barriers to entry... tools, time, skill, patience, money, maintenance. Young people are not as willing to give enough of any of these. More speed = higher frequency of repair, replace and wear. Not sure what the solution is for nitro, but more speed isn't it.