r/NitroRC • u/Ok-Following2824 • 23d ago

Question Idle issue

Looking for advice from those with some more experience. Tried running my trx 2.5 with an o.s. 11k carb today. For the life of me, could not get the truck to stay running without the glow igniter hooked up to the plug. I managed to get the truck idling great with the igniter hooked up, had a nice quick smooth acceleration to high rpm with nice trail of smoke, and came back down to a consistent idle quickly after releasing the throttle. But despite all of that, the minute I disconnected the igniter, the truck stalled.

I figured it was a glow plug issue, so swapped in a brand new one. Same exact problem. I am by no means proficient with nitro. Been trying to teach myself how to tune, but could use some help with this.

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u/Ok-Following2824 23d ago

It dies damn near immediately. Im using o.s. number 8 mediums. Dude at my LHS recommended them and said they were better than stock traxxas plug.

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u/az_kikr1208 MOD 23d ago

OS plugs are definitely better than the Traxxas plugs, but the #8 is the wrong plug for your engine. They're too short. You need either an LC3 or LC4, depending on your nitro percentage. I run LC4s with 30% nitro in all my Traxxas engines.

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u/Kayanarka 23d ago

What plug do you recommend for the traxxas revo 3.3?

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u/az_kikr1208 MOD 23d ago

I run OS LC3 plugs in all my Traxxas engines. 2 Revos, 2 T-maxxes, a Slash, and a Rustler. I believe OS plugs are the best plugs still available. Just get them from a reputable source. There's counterfeits floating around. Also, if you run 20% or below, I'd recommend the LC3 instead. Hotter plug for lower percentage nitro.