Friday nights Dupage area - Page 5 - Chitown R/C - Chicago's Largest RC Car and Truck Community

Thirdgen89GTA · (#101 (**permalink**))

Quote:

Originally Posted by Whitey04

yeah bills a smart dude, I would never sit in my house and try to figure this out. I think my head would explode.

Still bill I don't think my st... is all that light, it might be about a half a pound lighter then your truck but think off all the aluminum you've got on that thing. If your truck had as much plastic as mine it would be just as light.

One more thing on the 30's I drove bills jammin w/ O.S. 30 and that thing was sick at leisure. There wasn't a single place your could smash the throttle, and if you did in the straight you'd be in the wall at the end if you blinked. But other then that the engine was so unusable because the bottom end on that thing was sickning. You could come out of a turn and goose it right into a donut. I don't know why anyone would want to use that to race unless it was in a monster truck or heavy truggy.

Yep, and the 528xr was even worse. I remember the last time I tried to drag race it. Lined up all nice in the "left lane", got anxious off the line and gave it too much throttle. I ended up crossing in front of Slaytanic doing a u-turn unintentionally. It was sick.

But in reality, the 30vg isn't uncontrollable, though it is very punchy. The powerband isn't smooth like a nice .21, it makes its power like a muscle car. Sheer, brute force. Though it does rev quite well, on par, or slightly better than a Novarossi 528xs (not XR, whole different ball game there).

In order to figure out engine RPM from trap speed you need to know the following.

Primary ratio ( clutchbell / spur gear)
Secondary ratio (pinion / ring gear)

centerdifferental DeltaV (differential rpm between front and rear output on the center diff, highly dependent on the weight of the fluid used. I had to research a formula and contact my college physics professor to figure this out)

Overal tire diameter, as well as tire expansion under high G-force. Each tire is different so I had to measure it statically and under load. This ties in with the center diff differential rates. A locked center diff would eliminate this variable

Roll Out - Rollout is calculated from the overall tire diameter and is basically the circumfirence of the tire. A 5" tire diameter has a 15.7" rollout. Or that means it travels 15.7" per revolution.

From there its a nice formula that I do NOT have the time to type out here on the forum. But if anyone wants it I can send them the excel spread sheet and they can figure out their own ratios.

I don't gaurentee 100% accuracy, but I do know that it is fairly accurate. The only true way to check is to get a sensor on the flywheel and measure crankshaft rpm as compared to wheel rpm and trap speed.

Whitey04 · (#102 (**permalink**))

Quote:

Originally Posted by 4wheelinrevo

racing is has more to do with the driver then the engine,its the driver who wins nto the engine

+1 But a bad set up with a bad driver is just awful, a bad set up with a good driver is better, alot better, but still bad. Drivers are only half of the game, set up is a BIG deal. I don't know so much for nitro and off-road, but electric and on-road, its a BIG DEAL.

4wheelinrevo · (#103 (**permalink**))

What time is everyone going up there?

i just put the 2-speed in last night, getting new flywheel and a few other things today.

uh oh, i just remembered i forgot to put my gel cell on the charger

Thirdgen89GTA · (#104 (**permalink**))

9:00pm to whenever. I can't stay late as I've got to be up early to be at Cordova dragway for the MFBA rental.

4wheelinrevo · (#105 (**permalink**))

ill be there tonight for sure, probably around 8:30 0r so then, got to get my buggy tuned up

4wheelinrevo · (#106 (**permalink**))

well looks like the electric wins at 60MPH!!!!!

he slowly creeped towars 60 stopping at 59.4 and 50.6 and it didnt look like he was going to break 60 until he put his body on that is

jhautz · (#107 (**permalink**))

Who was the guy with the video camera last night? I'd like to get a copy of those videos he made. I dont think he got the 60mph run on vid, but a 59.4mph run looks the same on tape. I'd love to get a copy of whatever video clips he has if anyone knows how to get in touch with him.

Of if you read this PM me... Thanks.

4wheelinrevo · (#108 (**permalink**))

that was revo guy.

he got some nice pics of my 9.5 doing burn outs too.

next friday better be warmer or Im starting a bon fire with o'donnells 30%

Revoguy22 · (#109 (**permalink**))

Ok.. i have captured video of the myth him self..lol Heres JEFF!!!

Thirdgen89GTA · (#110 (**permalink**))

Quote:

Originally Posted by Revoguy22

Ok.. i have captured video of the myth him self..lol Heres JEFF!!!

Quick car! 60.5mph! With full wing. I imagine that if Jeff really wanted to and lowered it, along with removing the wing he could eek a bit more out of it. But its wicked fast.

As he was driving it (more like piloting it) the road dust was getting sucked up by the tires and well, it looked cool!

Weather looks good, we'll be out there again tonight.

4wheelinrevo · (#111 (**permalink**))

Quote:

Originally Posted by Thirdgen89GTA

Weather looks good, we'll be out there again tonight.

doesnt look to be as cold as last week was, just look at tim last week

Thirdgen89GTA · (#112 (**permalink**))

I got the Hyper One Seven all cut up now so I can run it with the body on. I may end up taking a sunday off the bash to race up at Hobby Town. I really would like to see this thing on a track.

Revoguy22 · (#113 (**permalink**))

Ya, Ill be there....

4wheelinrevo · (#114 (**permalink**))

well kierre was up to his old tricks again with a 2 wheel savage, and yes he drove it like this

Revoguy22 · (#115 (**permalink**))

I of course have captured it on video for your viewing....

CLICK IMAGE TO VIEW VIDEO

CLICK IMAGE TO VIEW VIDEO^^^^^^^

Gforce · (#116 (**permalink**))

Only Kierre.....at least it wasn't toothpaste in the diffs this time! lmao