DURGA... help!! please!!

[cbrook01]

Hi, I'm new to this site and forum - I hope you can help me!
I'm also pretty new to RC (last car I bought was a FAV from Tamiya 20 years ago!)
I've built my Durga and am using a GT3 Turbo 17x2 28.100rpm Motor. I put in the slipper clutch from Tamiya but it was so slippy that is it took forever to get up to speed (no matter how tight I tightened that slipper). I've removed the slipper with little change as a result. What's frustrating is my friend has the keen hawk with the Tamiya dirt tuned motor and the accelaration is unbelievable with a top speed way over mine! Should I get the dirt tuned, if so should I use the slipper? Otherwise I just love the car.

many thanks