trilerian

iTrader: (31)

We run a small technical track about 40'x60'. I gear my 13.5 at 108/39 (foam tires at 58mm) with the sintered rotor. The problem is even the 13.5 varies in gearing from motor to motor. A friend of mine is geared 84/29, my dad runs his at 104/36. Get the sintered rotor and gear it to the moon. The people who complain about it being to fast haven't run a well tuned co27.

fullsyzz

iTrader: (111)

Once again forgive my ignorance, but can you elaborate a tad on what more conservative means? Does that mean try running a smaller pinion? BTW, thanks for the help again. When I was having overheating issues at the track one of the guys recommended I get on this forum. He said you guys have the answers. So far I'm very impressed, and glad I found you guys.

Grizzbob

iTrader: (2)

Well, I was originally gonna reccomend the gearing I ran over the weekend, but I don't know if the rollout would be anywhere near what you've tried(I run rubber tires, never felt that comfortable running foams on a TC), but if this helps, the rubber tires I run are 63mm dia., & I was running a 5.8 final drive ratio(so you might be able to get a rollout from that, & maybe that'll give you a starting point).....

fullsyzz

iTrader: (111)

Ok, so if I was running 22/84, and you say gear more conservatively, does that mean running smaller than a 22t pinion or bigger than 22t? From what it sounds, I'm right in the middle of where I should be. Some seem to think a 19/84 is a good starting point, others are saying 29/84.

Also, you guys that are running 36/104, or close to it, what brand of gears are you running like that, that will fit the T2? Does that mean I gotta go to 64 pitch?

CAlbrecht

gearing for rubber tire on a small high traction track 4.0 FDR @ so cal raceway , let her ripp..

fullsyzz

iTrader: (111)

So does gearing more conservatively mean smaller pinion or larger pinion???

CAlbrecht

smaller

SlamMan

About the only gears that work are the www.precisionracingsystems.com Pro-Lite Touring gears. Have you calculated your gearing at www.gearchart.com yet? If you're running 22/84 with 58mm tires that's a 28mm roll out and way low for this motor. You can try going more conservative but in my opinion that's the opposite direction you should go. At least borrow a pinion around 28-30 teeth and see how it feels. That will put you closer to a 36-38mm roll out. Good luck.

Scottmisfits

iTrader: (7)

With 57-58mm tires I was geared at 116/35 on mine tonight. I came off at 150 degrees. The car felt great. That was with the stock rotor not the sintered one.

Grizzbob

iTrader: (2)

Right, & using that formula, my rollout would be something like 33.9mm, that's what I'd consider a starting point....

cvt01

iTrader: (2)

I was out racing the 13.5 first time yesterday. I run out of the pinions . 29/84 with 58mm tire dia. The thing is fast and it came out 135F even after 7 minutes during practice.

Anyone wants some barely used CO? 10 bucks each shipped

BrainTeased

iTrader: (4)

where are you guys taking your temps from ?

Scottmisfits

iTrader: (7)

I've been doing mine on he bottom of the motor when it sits in the car. It's the side of the can, just the bottom side of the car. That's where I temp it with any motor.

fullsyzz

iTrader: (111)

Well, I switched to a rubber tire set-up, and put a 19t pinion in yesterday, and it worked awesome. I didn't even bother trying the 28-30t pinions suggested after running the 19. I was running 117-126 temps after 5 min. The car is slower for sure (obviously, going from 22 to 19 pinion) but temps were perfect and the car was still quick enough for me. I will try a 28 just to satisfy my curiosity, but most likely will stick with 19, maybe bump to 20. Or maybe even order up some Delrin RW gears and run 22/86? This was with the bonded rotor and no fan. When my other 13.5 comes back from Novak I'm going to run the sintered rotor and mess with gearing some more, but I think I got it dialed. Thanks to all who contributed to this thread!!

Scottmisfits

iTrader: (7)

If you were running 120 with a 19t, Don't try 28. Slowly work your way there. Maybe try a 21. My best times were with the motor coming off at 150.