Im not familiar with the hsp cars but Gearing could have something to do with it. Somewhere around a 9.0 final drive ratio should get you close if it is a 2wd buggy or 2wd stadium truck. You figure this buy taking your Spur gear size and dividing it by your pinion. Then multiply that by your trans ratio. Also make sure always keep an eye on temps when installing a new system like this. Never over 170-180 degrees.

Also, i heard of people not having very good luck with the 35a hobby wing esc's. The hobby wing 60a esc has been fine but have heard a lot of failures with the 35a.

Good gearing info...

http://www.teamnovak.com/tech_info/b...r_gearing.html