Do you think I could go up to a 20/45 on my losi8? I will try the 2speed on the gt2 and see if I like it, and if it does not go well then maybe I can put in a single speed. My setup for the gt2 will be:
2200kv/ 15/21 7cell a123 @2300mah.

^^^ I second that notion. As of now, on 4s, it looks to be geared for about 45mph at the most. Most nitro on-roads are pushing well above that but their acceleration isn't nearly what you should have. With that said, you should be able to gear it up, especially running the 2200kv, to make up for those speeds and still have plenty of acceleration. You could probably gear it around 20/45 and beat up all over those nitro's. That would put you around the 58mph mark.
I don't know what size batteries you are using in the 8ight but you could definitely run 6s or 7sA123's.

Now, another suggestion I might throw in here is tires, if you're looking for a good tire to hold up at high speeds, pick up a set of Losi Rally premounts. They are amazing in traction and high speed runs.

You guys great, I can't wait to try this stuff out.

Check this out also:
http://www.rccars.com/forums/showthread.php?t=3296

Yeah, I saw this, that thing is quick! I wonder what gears he used for that on the pinion?
That speed is way too much for me.

How fast do you guys think the GT2 would go with my setup?

Check this out also: Ofna GTP, Neu 1515, 4s, MaxCramps batteries...
http://www.youtube.com/watch?v=Wwlrs2QYFKk

Those are the Losi Rally tires I linked to earlier also.

Joe's car has INSANE gearing - I think i provided a 30t 2nd speed pinion(riding on a 40t spur!). Theoretically it would top out around 140+mph or so with a 2200Kv motor on 6s Lipo.

Yeah but Joe said he has to let the motor cool after every pass so it is only good for the speed chase, not ideal for the parking lot race\bash. But for the speed chase... /drool :yes:

thanks mike is making me a kit:party:

Got my pinion gears today, do you guys just use blue or red locktite to keep the first gear on?

The servo plates ready yet?

is there a single servo plate? I plan to use motor brakes on my gt2!

No single servo plate, but nobody says you have to install both servos on the double servo tray. :)