I'm not sure, it would be too big for most tracks, but should be ok for a few speed runs. If your using buggy diffs it wouldn't be too bad, around 40mph on 4s, so it should accelerate ok. But it depends what voltage your using, what diffs, how heavy the car is and how your going to be driving it.

The motor I put the 20t pinion is the 1515 2.5D (1700kv), so a big pinion isn't as bad for it as the 2200kv. Today was the first time I used it, and I ran it on 14 cells nimh. I seemed pretty quick, but it was hard to tell exactly how good acceleration is, because it had been raining so it just spun the wheels.
I was driving it for a while (I was supprised how long it ran for), but it wasn't consistant hard driving, so I couldn't get a good idea of what temps will be like, though the quark and neu didn't go much above ambient temp.

I don't intend to run it like this though. I bought it to put in a 1/8th truggy and to run on 5s, but I haven't received the batteries yet and the mount and trays aren't finished either, I had to run it in the e-maxx though just to see what it was like, because it had been sitting in my room for the last week and half mocking me.

Thanks for all the info guys. Based on this information, I may be changing directions as to which brushless setup I am going to use. Looks like right now I may hang on to my quark 125 for a 1/8 scale brushless conversion or ebay it.

i only asked because i will be using it on my maxx with single speed buggy diffs, 2200 neu, 2p2s 8000maxamps. THe only reason i asked is because i wanted to know what the smallest number pinion i could use with the 51t and you said probably 18t Right. and i just wanted to make sure this was not over geared. Also can i get a slightly bigger spur to work with the strobe like 55t, so i have more gearing options because right now it seems that all i have is 51t spur and 18, 20, or higher gearing and that is not much on the lower end of the spektrum of gearing. that all. my truck is very similar to SSSP's

I have used 51 tooth spur on the strobe with 16 tooth pinion on my single speed gorillamaxx and i found out that is the lowest pinion this is my mr g2r revo if you will use it for bashing it will be alright with the quark monster pro with RCM heatsink with one fan but for racing i still had some thermal shutdowns on the the track when the temps here in Indiana went up to 80+ F but gearing it down will take care of the problem, Mike has bigger spur gears to put on the strobe,I think about 62 tooth spur,you might send hime a PM for that.

Luvsrc is your motor the finned version? If it is, did you have to grind the fins or modify anything else to get the 16t pinion to fit?
Were you using revo diffs in yours? If you were, then 18t pinion with buggy gears (what GrorrilaMaxx360 said he's using) would be almost the same ratio as revo diffs and 16t pinion.

There is a 65t that will fit the strobe with a bit of modifying (I'm not sure exactly how much, I haven't had to do it), but you'll probably also have to extend the adjustment slot in the stock motor plate, because it puts the motor so far away. I think that spur is for a ofna pirate, but I'd check with someone else first, like Mike and I think squeeforever knows as well.

How come you want to change setup? What do you want to change to?
I think your e-maxx would work well if you went with the 1515 2.5D on 5s, and changed to buggy diffs instead of truggy diffs, and changed to strobe and 51t spur instead of 32p. Then 51/18 would give you about 34 mph, with room to gear up. That's what I would try and do anyway, if I wasn't putting the neu in a 1/8th.

yes I'm using the finned version my 16 tooth pinion on my standard revo diffs is the lowest pinion i can fit in my gorillamaxx single speed tranny without grinding the finns which I will not do it anyways, you can use the buggy version or even the truggy version which lowers the gear ratio more so all you have to do is put a bigger pinion on it, the 18/51 on buggy gears will be the same with my 16/51 on a standard revo diffs

does anyone know what size pinion mike uses, becasue he races and keeps quark cool, but it is not to slow do you know what size pinion and spur he uses with his neu.

Oh, ok. I couldn't get a 16t pinion to fit on mine (2 speed e-maxx transmission and stock motor plate).
I'm trying to figure out why yours will fit and mine won't, and the only thing I can think of is if you have a gorrilamaxx motor plate, that sits the motor in a slightly different place?