I would consider these options:
-- Buy a high-torque servo for the steering.
Such as: Hitec HS-645 or Hitec
HS-5645MG (I prefer the 5645MG)
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXUZ80&P=ML
-- Take the stock steering servo (SF-2) and put it on your brakes.
You can check out this tip to dial in your linkages.
https://www.rcnitrotalk.com/2005/savage-linkage-mod/
-- Definitely get some lighter tires and rims. What kind of track is it (clay, sand, etc.)?
This will help you decide on which type of tires.
-- Consider a higher weight shock oil (40) and maybe switching out to a triple rate spring.
RCBoyz has a very nice triple rate spring that I run with.
http://www.carttonic.com/catalog/in...tion=catalog_productinfo&uid=466&pi_id=115710
-- Try to dial in your gearing and optimize it for the track that you race on. You can change out your spur gear or clutch bell as needed.
-- Consider a 6V humppack. It will keep your servo's fully powered for your races. As regular alkaline batteries die, you loose power to your servo's. Thus they will turn and move slower and also won't respond as fast.
-- Consider a Motor Saver Intake and a new pipe. I run with the OFNA dual chamer tuned pipe and have had great success with that combination.
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXDVJ2&P=ML
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXCWH0&P=
-- Consider changing your nitro fuel % or oil % to give you a little extra power if needed. I have run the Trinity Monster Horsepower 30% in the stock engine and have gotten some sweet power from her. Plus, it still has 12% oil lube so you don't burn the engine out.
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNE14&P=
There are tons of other items, but those would be the best to start off with. The hardest thing is learning how to drive on your track. All the power and performance in the world won't mean jack, if you can't control the truck.
Here's some driving tip:
-- Don't make sudden jerks on the steering. Smooth controlled movements is needed. Never take your hand off the steering wheel. Don't turn it all the way, and then let go to allow the truck to center itself again.
-- Learn how to control the throttle/brakes. Sometimes you need to drop the hammer but other times you might only need to give her half throttle or half brakes. Don't get in the habit of either WOT or Full Brakes. Practice on controlling her in the middle ranges.
-- Brake before you go into the corners (if needed), to slow down. Don't brake in the middle of the corners. Braking prior to the corners will allow you to have a quicker exit speed and allow you to setup a better driving line.
-- Learn where on the track your truck seems to grip the best or you drive the best. These will be the places where you should concentrate on passing others.
Sorry to go overboard and give such a long list, but hopefully you will at least see one thing that you can try out.
Later......