If your not comfortable with your nephew running faster to keep up with the lead pack, then I would leave the gear alone until he gets more seat time and becomes more comfortable driving the car. If he is running middle of the pack because the faster cars are pulling off the corners faster, then you need to work on set up. In that case; Then we need to go back and look at your last thread on tire temps.
http://www.legendsracer.com/index.php?topic=1379.msg11226#msg11226We now know that you are running a 1/4 mile track with a restrictor plate, and that your nephew is in his rookie year. That is helpful!
I think you will end up back looking at tire pressures and spring rates. Perhaps ride heights and, as Chance suggested, where your weight is placed.
Are you getting any better feedback from your driver now that he has spent a little more time in the car?
If indeed this thread leads back to your original thread, which I believe it will; Then I will move this info and whatever corresponce to your other thread.
It might help if you let us know which track(s) you run. Perhaps one of our members can shed a little more light on your situation. I have a couple of set ups in my library that I can share with you, but will need to check what size track(s) they are for. I've been asked not to post them, but have been given permission to share them via email or private message. I respect our members that have shared their info with me, so will respect their wishes not to post it. Post your track, more info, whatever you feel comfortable sharing. PM or email me if you do not feel comfortable sharing more info. I'll try to help where I can.
Regards,
Steve