What are some recomende hop ups for the nitro rs4 3 to get more power out the engine.

[joker2005]

What hop up parts are good for the Rs4 3 to make it faster?

 

[Candyman]

It depends on what version you have. If you have the standard RTR, your best bet would be a full engine swap and a 2-speed tranny. If you can't afford to do that, the very first thing would be a new header and pipe. That cast header sucks. Get a nice round header and a good breathing pipe. Also, a 2-needle carb would be great. Unfortunately, it's very difficult to find a carb that is threaded into the body like the HPI engine. A 2-speed is a must. Regear it a bit. That should give you more speed.

 

[greenwing7]

more speed... just get a spur with less teeth, and a CB with more!

 

[4u2nv]

If ya have the .15fe, Id rip that out, and get a different mill. Them are HUGE pains in the ass.

 

[Diver6127]

Change the mill and get a 2 speed if you don't have it already.

 

[Ysr04]

My 15FE has not given me any troubles what so ever. The engine has run great since the day if was first started. I set the needle a little on the rich side and have not had to make an adjustment yet, the engine runs very well. I use the HPI Roto Start system and starting the engine is a breeze as well.

 

[Candyman]

There's no doubt the .15FE is a reliable engine. But in it's stock form it's a dog. I'm still running mine for now, but that's because I just feel like running it into the ground before I drop my OS .15 in it. The FE has a bit anemic porting. I actually did some mild port modding on the sleeve and it seems to be a little better, but you're only going to get so much out of it. The single-needle carb really limits the snap and speed you can coax out of it. And the stock cast header is way too restrictive. All in all it's a good engine to learn on. It gives just enough power to have fun. But if you're looking for raging speed from this ride, the engine is better off being replaced.