GT3 Proxy 2020_Registration Rules & Info (UPDATED)

[BARC 1]

I had an Avant chassis under this car, but I like to build my own. Feeling if I could make something faster than the Avant I would run it

I built an adjustable inline chassis out of square brass tubing. It has a weighted drop arm and a adjustable floating pod. Wanting to build as much as this as possible I made my own motor mount, as well as made my own crown gear. Using inexpensive nylon gears bored out to accept aluminium tube which is inserted through a bored collar to accept the aluminium tube. I drill out the grub screw hole in through the aluminum sleeve so the set screw can be used to fix the gar to the axle. Using a Patto's Little Ripper (33k) and some NSR ultra grips I set about doing some testing. On my home track 8/32 ratio seems to give me the best lap times as the brakes are better and acceleration quicker. Not sure how this ratio would work on the bigger wood tracks. However this motor has a little bit of ON off type characteristics, so the bigger crown seems to smooth it out.

Bottom line is I met the laptimes of the tuned Avant, so this chassis may be used for this event. With so much time to go, there most likely will be more chassis built and tried. God Lord knows I don't enter because I think I am going to win, but the building is fun. So the more I can do before the car is mailed of the more satisfaction I get out of the event.







If anyone who has run this event wants to comment of the best gear ratio to use for success, I sure would like to hear about it.

Thanks

[Audi1]

For an S-can inline, contact Chris Walker (chrisguyw).

Allan

[Brumos RSR]

Dan, that chassis looks great and YES what Allan said. I'm worse than 3/4 of the field, but if there's anything I can do let me know and Good Luck!!

[F1Fan]

Hi Dan

Here is a link to the spreadsheet that has all the technical info you can wish for. There are weights, ratio and RPM details. Look for the 2019 tab at the bottom. More than ratio, I would say that rear axle RPM is important, have a look, I think you will find the info of value.

Cheers

Chris

https://docs.google.com/spreadsheets/d/ ... sp=sharing

[F1Fan]

[F1Fan]

[BARC 1]

Tire prep

Never having prepared rubber tires for a proxy, I have a few questions on what is allowed.

Can you treat the rubber tires with a tire oil as long as on race day the tire leaves no risidue?

Or is the intent to have no tire treatment allowed of any kind? Just glued and trued tires fresh out of the package?

Do front tires need to be rubber as well, or can urethanes be used on the front axle. Thought is with and application of nail polish to produce no grip, the urethane is coated.

As this seems to be a battle of the fastest, I am asking these questions in an attempt to actually qualify for the race.

Allan

Are you saying Chris supplies s cans? Lookin* at the tech sheet, I see he was using a Shark motor. The Little ripper,is a 33k motor,and with the right gearing quite drivable Having said that the 21.5 K Thunderslot motors are pretty sweet. I bought a couple to try and am very impressed. I haven’t tach’d them but I have my suspicion they are turning more than 21.5k as they are much quicker than a Pirahna

F1 fan

I looked at the data, but it appears to me the axle speed does not correlate with the gear ratio and motor rpm. I will have to double check, but at first glance the numbers looked odd. I suppose the difference in math is because of the motor being loaded. The more torq a motor is capable of the less load factor on the rear axle? Makes sense as to why a lower rpm motor with good torq numbers can match higher rpm motors. The H&R jack rabbit has always surprised me with how well this 14 K motor does. As you mentioned ,it is the rpm delivered to the rear axle at load that is the deciding factor more than motor rpm.

[F1Fan]

[Brumos RSR]

Great post Chris! Boy did I learn from "tire gate" and my over doing it a few years ago with "prepping" tires and how they were clag magnets.

[BARC 1]

Thanks for the feedback. I primarily like to build the chassis, so most likely will enter something scratchbuilt. I will see how close I can get. The data and info on the tires will be valuable going forward,

Thanks

[Dmn17]

I would like to enter a Viper
Same number please 17

Thank you
Dave DMN 17

[F1Fan]

I was hoping you would be back, thanks Dave, I will add you to the list.

Chris

[cj74]

Gonna throw my hat in the ring. See if I can even hold a candle to you guys. All things TBD

[arroldn]

[cj74]