How to deal with varrying sized drivers (Page 1 of 2)

Custom inserts for the smaller drivers.
Grassroots Motorsports did an article on it.
Belts can be tricky, but sliding seat rails help with that.

You could always go the extra crazy route and build a dual control car.

cool. I didn't know seat inserts were a thing actually. all members of the team are going to buy one of those and we'll just swap them at driver change.

as awesome as a dual control car is. I don't think that its for us.

two crotch straps... got it.

thanks everyone. really excited to get into this. bummer is that I live about 300 miles from the rest of my team so I'm limited as to what I can do.

Do not use Home Depot expanding foam for your inserts.  That stuff gets hot when it expands.  It also will break down into dust quickly.  There is specialty foam for this purpose but the last time I looked it was expensive.  I have no idea what material people use for inserts here.  Also, mount your seat slider on a ramp going upwards towards the steering wheel.  As you move the seat forward, it raises the seat so your smaller guys can see over the wheel.  It's going to be a challenge to find a seat big enough for someone 350lbs+.  You also want to brace the foo out of those seat mounts and go big on the hardware as that is a lot of weight to contain in a wreck.

Two of us are Big guys. Ultrashield goes up to an 18" wide
https://www.ultrashieldrace.com/catalog … o-Seat/166

Kirky goes bigger (20), but it's not a containment seat and is pretty flimsy so not good if you need it on a slider. It has to be bolted in the back.

you are all awesome. I can tell already that the next year where we're building the car and asking questions is going to be a great time. We had a ton of fun just spectating at the ridge.

As a big guy myself - trust me, we know we should lose weight.  Telling him is redundant.  If you want to 'help', provide encouragement about getting out of the house and into some sport/hobby that breaks the cycle of weight gain.

Cant go wrong with dual control

You could always bite the bullet and change seats when the BIG GUY gets in. It's a 20 minute job..if you  are just here to have fun there's no down side.

I would think that if you showed them at the tech inspection and explained things you'd be ok. I'll wager they'll just make you come for a re-check when you make the swap. That is much safer than using adjusters and inserts... going from 5'8 140 to 5'11 165 isn't a huge deal going form short and light to tall and heavy is. Also consider the height of the seat. the tallest driver has to have 2" of clearance. This might put the shorter peeps down to low to see over the hood.

I don't think the OP's problem is height disparity as much as it is width disparity.  Ramping the sliders is always a good idea but an acceptable solution to a 200lb + weight delta is a bit tougher problem to solve.  I don't see how you easily get around ending up with a seat that doesn't properly fit anyone.

I think we're probably going to go the 2 seat route. its about 3 small guys and 3 bigger guys so if we position who drives when we shouldn't have to swap the seat every driver.