HAS ANYONE REACHED 100 MPH WITH A NITRO???

[Jaydiaz1993]

If so could you please tell me the gearing you're using? I cannot get my Nitro to go past 69mph

 

[Chubaka]

What engine and chassis? Have you played with bodies and suspension? Howabout tires and the slipper clutch? What nitro % and plug you got? Alot of variables.

 

[Jaydiaz1993]

Right now I have the Nitro Rustler with a big block .21 and 2 speed tranny from the Jato, I've got no slipper clutch I eliminated it. I have belted tires and I'm running on 30%. I have to check the gearing but I'm pretty sure is like 20t clutchbell and like 39t spur. How can I make it faster?

 

[Littlemotor]

Right now I have the Nitro Rustler with a big block .21 and 2 speed tranny from the Jato, I've got no slipper clutch I eliminated it. I have belted tires and I'm running on 30%. I have to check the gearing but I'm pretty sure is like 20t clutchbell and like 39t spur

Gonna need to do the math to determine exactly what your final drive will require RPM wise. This will require your rollout (tire circumference) at speed. Unless you’re on foams; that measurement will be different-static..

Once you’ve done that, you’ll have an idea of exactly how much room you will require, and the horsepower required to make it happen.

“Big Block 21” doesn’t exactly tell us anything.. ALL competition .21’s are “big block” footprints… Engine model, or port count, modifications (and who did the work), etc., will give us a much better idea of if that motor can do what you require.

 

[Jaydiaz1993]

Gonna need to do the math to determine exactly what your final drive will require RPM wise. This will require your rollout (tire circumference) at speed. Unless you’re on foams; that measurement will be different-static..

Once you’ve done that, you’ll have an idea of exactly how much room you will require, and the horsepower required to make it happen.

“Big Block 21” doesn’t exactly tell us anything.. ALL competition .21’s are “big block” footprints… Engine model, or port count, modifications (and who did the work), etc., will give us a much better idea of if that motor can do what you require.

I got 87mm belted tires, With an lrp .21 spec 4.
No other modification aside from putting a 2 speed on the Rustler. I also delayed the shifting on the tranny to make it hit 2nd gear with as much speed as possible.

 

[Littlemotor]

I got 87mm belted tires, With an lrp .21 spec 4.
No other modification aside from putting a 2 speed on the Rustler. I also delayed the shifting on the tranny to make it hit 2nd gear with as much speed as possible.

Need to determine what their circumference is at speed. Also your final drive ratio. That motor is gonna need a LOT of work, and you’re gonna need a LOT of room to get there.. Your max RPM is gonna be around 35,000rpm, but it’ll be done making power long before that.. I’m gonna say you’ve got your work cut out for you out of a sport .21..

 

[Jaydiaz1993]

I was thinking of actually going with a .15 with higher revs, 45k rpm not sure if a smaller higher reving engine would be better though.

 

[Littlemotor]

I was thinking of actually going with a .15 with higher revs, 45k rpm not sure if a smaller higher reving engine would be better though.

You’re gonna need the power of the bigger cubic inch to shove that thing.. You’re also likely gonna need a legit race motor on top of it all.. A sport engine is only gonna take you so far before it spits the rod.. You can make up for RPM with gear ratio, but you’re not gonna make up for gear ratio with rpm when you neuter the horsepower along with that trade..

I’d say that today the smart move would be Nova’s “Outlaw” .24 9-port motor. Then you’re gonna be sending it off to be worked over.. Fast isn’t cheap..

 

[D3MON]

I got 87mm belted tires, With an lrp .21 spec 4.
No other modification aside from putting a 2 speed on the Rustler. I also delayed the shifting on the tranny to make it hit 2nd gear with as much speed as possible.

later or earlier shifting will not necessarily make it go faster, just easier to control when it does the gearing is the same no matter what revs are when it gets to them. staying with the same engine, gearing up is really the only option either smaller spur and or bigger pinion.
Could possibly be faster with a higher revving small block as less weight, but no idea where the power will balance out on gearing due to less torque/power from the engine when you gear up.

 

[BustedAw11]

Steve pond had a big block powered hpi super nitro he built back in the day
He was an editor from rc car action magazine. With all the engine mods and a great speed run platform (also 2 speed) he managed 101.


I'm not saying a nitro rustler couldnt... but its gonna take a very well setup truck to stay planted and one hell of a hot .21 or bigger to do it.
A very long range radio and one hell of a long run will be required for sure.

 

[Jaydiaz1993]

Ok so I took into consideration that the current engine I hace only revs to 35k rpm. So I have to get an on road big block with atleast 43k rpm, this are my two options right now. Also I've been looking for a bigger 1/8 clutchbell right now I have a 20t clutchbell looking for a 24t or more if possible. If you guys know of any clutchbell with such specifics or similar to it it would definitely help! Also getting smaller spur gear. Right now I'm reaching 67mph so I'm sure I'll atleast reach 75 once everything is set up. But again my goal is 100 mph. I'm going to need help lol

 

[Littlemotor]

Math will help.. Guessing is expensive.. Also, it sounds like you maybe do not have a bunch of experience with nitro engines-they will not provide USEABLE power all the way up to their max RPM.. You have to account for that.. That is absolutely going to require the correct/necessary equations. Once you enter in your required values, you will KNOW what RPM it’s gonna require mathematically to get there. THEN you can start testing..

There’s a whole lot more to this than just, “smaller spur, bigger pinion”… When you hear people say that’s all you have to work with, it’s a good idea to go the other way..

I’d look at the engine I mentioned to you.

That AD3 is an OFF-ROAD buggy engine. Not at all conducive to what you’re looking to do.

That Nova, you’re paying for the name.. I mentioned the outlaw for its DISPLACEMENT.. You may not even need to have it modified because of it..

 

[Jaydiaz1993]

Math will help.. Guessing is expensive.. Also, it sounds like you maybe do not have a bunch of experience with nitro engines-they will not provide USEABLE power all the way up to their max RPM.. You have to account for that.. That is absolutely going to require the correct/necessary equations. Once you enter in your required values, you will KNOW what RPM it’s gonna require mathematically to get there. THEN you can start testing..

There’s a whole lot more to this than just, “smaller spur, bigger pinion”… When you hear people say that’s all you have to work with, it’s a good idea to go the other way..

I’d look at the engine I mentioned to you.

That AD3 is an OFF-ROAD buggy engine. Not at all conducive to what you’re looking to do.

That Nova, you’re paying for the name.. I mentioned the outlaw for its DISPLACEMENT.. You may not even need to have it modified because of it..

The Nova engine you mentioned is out of stock I already looked for it that's why I went with the other two because they're the highest rpm engines I've found. I'm not saying I know about engines but I got a Nitro Rustler to hit 67 Cmon give me some credit lol. OK so the Adam engine is not good. Guess I'll continue with my search.

 

[Jaydiaz1993]

This one actually has the same displacement and same rpm for lower price, what do you think? But is off road.

 

[Littlemotor]

There are other vendors aside from Amain….

If you want a truggy motor, then grab that one.

 

[Jaydiaz1993]

There are other vendors aside from Amain….

If you want a truggy motor, then grab that one.

Technically it is a Truggy But I understand what you mean. I will be looking for an on road. I'm going to check ebay and Google to see what I can find. How can I do the math to find the actual rpm of an engine?

 

[Littlemotor]

Technically it is a Truggy But I understand what you mean. I will be looking for an on road. I'm going to check ebay and Google to see what I can find. How can I do the math to find the actual rpm of an engine?

View attachment 253556

Truggies have three differentials, and are based off of a 1/8 off-road buggy..

 

[Jaydiaz1993]

Truggies have three differentials, and are based off of a 1/8 off-road buggy..

Learned something new, Rustler is a stadium truck.

 

[Littlemotor]

Learned something new, Rustler is a stadium truck.

Correct.

Anyhow… Joe @ AbsoluteHobbyz has one on hand, and he’s a killer guy to deal with.. No sales tax is applied either (which is a MASSIVE discount in itself).. Just shipping. Use the $45 off monthly coupon code too. MUCH better deal than you’d ever get from Amain.. -shocker…

https://www.absolutehobbyz.com/nova-engines-r9r-outlaw-24-9-port-on-road-nitro-engine-std-shaft.html

 

[Jaydiaz1993]

First time hearing of this website, I'll check it out. Also saw they have 22t pinion gear which i might get too. Thank you for your help!