Originally posted by mudpuppy
Thanks for the input guys.
I have a new L4 that has been sitting on the shelf since last fall. It is my first pan car and it hasn't seen a track yet. With warmer weather approaching, I'm finally going to get a chance to run it. We race on an outdoor asphalt track.
I'm told that the L4 diff also acts as a slipper. Seems to me that the diff shouldn't be allowed to slip. What is your understanding on how tight the diff should be?
i slip mine as track/traction conditions dictate
i have run carpet were i set my diff as "boomer" states above. however depending on your track conditions the diff adjustment can be a useful tuning tool, especially on slick asphalt tracks.
example or local Hobbytown asphalt track is a banked ovalroadcourse combo with a offroad track nearby. the driverstand separates the two. they blow it (no sugar waters, soda spray, VHT) off prior to the race that's it. in fact both are raced on the sameday.
on this track we haven't been able to run mod motors even 19T's
have problems. the rear ends won't stay planted, no matter what set-up you use on the car. after a lot of testing, we ended up running stock. most of us run 88T/31P spurs (gearing is to bogg the motor down and smooth out the cars acceleration), PU frts, PK or GY rears. and 90% of us adjust our diffs to slip (both an old school thing). my set-up has about a 2-3ft slip before it takes. after one or two laps it heats up and slips less. the cars make 8min no problem in this config.
i use carbide diff balls and change the plates about every two weeks. running outdoors you would probably have to do this anyway.
5 different racers have asked me to try their cars. after just running the first ten feet i bring back, check it, readjust their diffs to my style setting, i don't even do a lap, hand them the controller and say now try it. they look puzzled and after one lap ask what did you do. i tell them and they say " I was told the diff shouldn't be allowed to slip"
what alway's really gets me though is with the modern day radios and the adjustments. you should be able to set the radio/car acceleration rates/EXPs/curves/delays so you wouldn't have to do the above things.
after asking people what their settings, etc. i am always amazed...they don't know and sometimes are vague on how to work/set the controller. once they have it basically set-up to RUN they don't want to mess with it. (sort like the VCR thing
) 90% of the people i have helped in 12th have never really read, used, or understand all the options on their radios. in the last 2 years of 12th racing here we have lost more racers due to this, i beleive than anything else. i couldn't drive their cars with steering at 150% and who knows what else settings. move the wheel an 1/8" and they car does a near u-turn. they will work the set-up to death. or blame it on something else..... but not touch that radio.
i currnetly use a 1989 KO EX-1 AM radio and have a new KO EX10 Helios on order. i will see if there still will be a need to slip at our slick track.