Hi all, please be kind :-) I’ve read a lot and tried a few things… I come from running OS Nitro Heli Engines and they are so simple. Run in is as per manual then set needles and forget, perhaps a couple of clicks one way or another from depths of winter to highs of summer.

Ive had a few cars and even a bike, and while I’ve had some success running and tuning I feel like it’s always a coin toss as to wether the car will start.

I always thought - due to my helis - that more nitro % simply meant richer settings. The minimum % I run in helis is 20 and max is 30%.

One of my most successful nitros was a Losi RTR 8ight buggy that ran well with 25% nitro and the stock plug which I believe was a medium plug I think that was a .21. However when running the ubiquitous Thunder Tiger .15pro or their .12bk or the HPI .15 NITRO star I find I need lower nitro % - 16% - and a hot glow plug. But I also find myself tweaking needles each day and it’s not to get 100% out of the engine it’s just to run it, indeed I prefer to run on the rich side.

So I guess the $1mill is …. Is there a clear guide for engine size, nitro % and which glow plug to use? If you run a Heli with an engine, I’ve got you covered, but what’s the answer for cars?