Ok ...probably in reverse order ......... (I've not run an RTR ZX5 but I'll do my best)
Speedo can take down to a 17 turn motor ...... on the correct gearing of course.
The shocks should be fine! Kyosho shocks are just about the best in the business now. Ok the ones on the RTR are plastic bodied and use the original ZX5 cartridges but hey, they are still super smooth and more than up to the job. To get the ride height to your liking you just need the wind the top spring platform down the shocks a bit. Try the car with the rear drive shafts level and the front whishbones just slightly lower than level (ie inside end slightly lower than the outside end).
Get hold of some decent shock oil around 35wt (350 in Kyoshos language) for the front and 30wt (300 for Kyosho brand) and replace what is in the shocks from the factory.
Tht should see the car handling well.
There is no need for an undertray in this car as the body is very closly fitting to the chassis. I've run my car on just about every type of surface including a loamy 1/8th track and not had any problems. If your concerned use Velcro (hook and loop) to hold the body shell on to the chassis (less fiddly than pins too) and that will help seal it.
You need so gaps for airflow otherwise everything in the car will cook and all the electricals will fail quickly.
There is a gap under the spur in the chassis for bits of dirt and debris to exit through so what was described doesn't happen.
There was a ZX5-RTR running at Coventry on Sunday and the guy driving it said he thought it went really well, he won his final to prove the point!!
If you need any help with the car then just post up the questions ... I will do my best to help with the car.
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