Xray T2'007
#3031
Tech Master
iTrader: (1)
Personally, I keep my diffs as loose as I can get them without seeing diff slip. It does seem like having loose (but not slipping) front diff and tight rear diff can cause oversteer/s#^thooks. Beyond slipping or non-slipping, I measure diff tightness by grabbing one wheel and the spur, then trying to turn the other wheel. I 'measure' with my hand how much torque it takes to slip the diff.
A diff that is tighter than it needs to be takes away traction from that axle during a turn.
Having the front diff slip on corner exit will make the car pretty much impossible to drive, as the car ends up in rear-wheel-drive, which leads to huge oversteer on corner exit in our touring cars. [fronts have full traction available for causing cornering, while rears have almost none and so break loose instead of supporting cornering].
brew, you are flat out smoking your diffs. If I were you, I would pull apart both diffs and sand the thrust washers until the ball tracks disappear, then reassemble and follow the instructions. Page 7 of the 007 manual has the diff setup procedure.
A diff that is tighter than it needs to be takes away traction from that axle during a turn.
Having the front diff slip on corner exit will make the car pretty much impossible to drive, as the car ends up in rear-wheel-drive, which leads to huge oversteer on corner exit in our touring cars. [fronts have full traction available for causing cornering, while rears have almost none and so break loose instead of supporting cornering].
brew, you are flat out smoking your diffs. If I were you, I would pull apart both diffs and sand the thrust washers until the ball tracks disappear, then reassemble and follow the instructions. Page 7 of the 007 manual has the diff setup procedure.
#3032
Tech Apprentice
Personally, I keep my diffs as loose as I can get them without seeing diff slip. It does seem like having loose (but not slipping) front diff and tight rear diff can cause oversteer/s#^thooks. Beyond slipping or non-slipping, I measure diff tightness by grabbing one wheel and the spur, then trying to turn the other wheel. I 'measure' with my hand how much torque it takes to slip the diff.
A diff that is tighter than it needs to be takes away traction from that axle during a turn.
Having the front diff slip on corner exit will make the car pretty much impossible to drive, as the car ends up in rear-wheel-drive, which leads to huge oversteer on corner exit in our touring cars. [fronts have full traction available for causing cornering, while rears have almost none and so break loose instead of supporting cornering].
brew, you are flat out smoking your diffs. If I were you, I would pull apart both diffs and sand the thrust washers until the ball tracks disappear, then reassemble and follow the instructions. Page 7 of the 007 manual has the diff setup procedure.
A diff that is tighter than it needs to be takes away traction from that axle during a turn.
Having the front diff slip on corner exit will make the car pretty much impossible to drive, as the car ends up in rear-wheel-drive, which leads to huge oversteer on corner exit in our touring cars. [fronts have full traction available for causing cornering, while rears have almost none and so break loose instead of supporting cornering].
brew, you are flat out smoking your diffs. If I were you, I would pull apart both diffs and sand the thrust washers until the ball tracks disappear, then reassemble and follow the instructions. Page 7 of the 007 manual has the diff setup procedure.
Wouldn't it end up with understeer while exiting. FWD gives more steering I thought.
#3033
Tech Addict
Personally, I keep my diffs as loose as I can get them without seeing diff slip. It does seem like having loose (but not slipping) front diff and tight rear diff can cause oversteer/s#^thooks. Beyond slipping or non-slipping, I measure diff tightness by grabbing one wheel and the spur, then trying to turn the other wheel. I 'measure' with my hand how much torque it takes to slip the diff.
A diff that is tighter than it needs to be takes away traction from that axle during a turn.
Having the front diff slip on corner exit will make the car pretty much impossible to drive, as the car ends up in rear-wheel-drive, which leads to huge oversteer on corner exit in our touring cars. [fronts have full traction available for causing cornering, while rears have almost none and so break loose instead of supporting cornering].
brew, you are flat out smoking your diffs. If I were you, I would pull apart both diffs and sand the thrust washers until the ball tracks disappear, then reassemble and follow the instructions. Page 7 of the 007 manual has the diff setup procedure.
A diff that is tighter than it needs to be takes away traction from that axle during a turn.
Having the front diff slip on corner exit will make the car pretty much impossible to drive, as the car ends up in rear-wheel-drive, which leads to huge oversteer on corner exit in our touring cars. [fronts have full traction available for causing cornering, while rears have almost none and so break loose instead of supporting cornering].
brew, you are flat out smoking your diffs. If I were you, I would pull apart both diffs and sand the thrust washers until the ball tracks disappear, then reassemble and follow the instructions. Page 7 of the 007 manual has the diff setup procedure.
Mike
#3034
Although a looser front diff does help steering entering a corner, Adamge was correct with his statement.
Consider the most extreme case, where a diff is SO loose, its like it has no affect, and a diff SO tight, its basically a spool.
When you exit the corner and get on power with an extremely loose diff, the car can not put any power to the front wheels, and it will act like a 2wd car, spinning the rear wheels.
But if the diff in the front is extremely tight, like a spool, when you exit the corner on power the front of the car will provide plenty of pull, and keep the rear end from spinning out.
Again, this is kind of a blanket statement that depends largely on the surface and your particular set up.
At nats, I went from a one way to a diff in the front set fairly tight. My set up performed extremely well with both, and I made no other changes to the car. I did lose a little speed going into the corners, but the car worked very well mid and corner exit. It also helped settle the car down through the high speed chikane and "festival", and was much more predictable. Overall, my lap times acctually improved slightly because the car was more stable and could be driven harder if I needed to. Also, I went with the diff just incase I had contact with other cars on the track. The diff car will usually win against the car with a one-way for some reason. So it was a safety play.
Consider the most extreme case, where a diff is SO loose, its like it has no affect, and a diff SO tight, its basically a spool.
When you exit the corner and get on power with an extremely loose diff, the car can not put any power to the front wheels, and it will act like a 2wd car, spinning the rear wheels.
But if the diff in the front is extremely tight, like a spool, when you exit the corner on power the front of the car will provide plenty of pull, and keep the rear end from spinning out.
Again, this is kind of a blanket statement that depends largely on the surface and your particular set up.
At nats, I went from a one way to a diff in the front set fairly tight. My set up performed extremely well with both, and I made no other changes to the car. I did lose a little speed going into the corners, but the car worked very well mid and corner exit. It also helped settle the car down through the high speed chikane and "festival", and was much more predictable. Overall, my lap times acctually improved slightly because the car was more stable and could be driven harder if I needed to. Also, I went with the diff just incase I had contact with other cars on the track. The diff car will usually win against the car with a one-way for some reason. So it was a safety play.
#3035
Tech Master
iTrader: (1)
I believe you have it the wrong way round. A loose front diff will give you more steering entering the corner and less coming out of the corner. A tighter diff is the exact opposite of this. Having any kind of diff slip just makes the car slow and handle inconsistantly
Mike
Mike
I want to clarify, though. I was discussing what happens when the front diff is so loose that, under power, it totally slips, so that no drive power is exerted on the front wheels, and all the drive power ends up at the rear wheels. This is not the same as having the front diff set slightly looser than the rear.
#3036
Tech Master
iTrader: (1)
Pitcrew, speaking of oneways, I've been routinely racing asphalt/rubber on a track that demands braking at the end of the straight. It's simply a dot hairpin, so very tight, and it's entered at full speed. Does this single corner render a oneway silly to try, or could it still work?
-Adam
-Adam
#3037
Tech Addict
You are very correct in the extreme case of a slipping front diff, but in racing terms, you should never set you diff that loose.....
Mike
Mike
#3038
Tech Champion
iTrader: (13)
It's worth a shot, but a car properly setup with a spool will be much easier to drive in traffic, and when pushing the car really hard. That one hairpin can cost a lot of time in the end if you mess it up. I feel a spool will be more consistant as well since it is easier to drive. Even if the fastest lap maybe be a tad slower than a one way at times, Its better to do that lap over and over again rather than one slightly faster lap and one BIG crash hahaha.
-Korey
-Korey
#3039
Tech Rookie
Thanks for the info... I did find some info in the manual is there a "standard" procedure for tightening the diffs ? some manufacturers tell you to tighten and then back off x amount of times is there such a thing for x ray to get in the ball park ?? or is it all feel ??
thanks
thanks
#3041
Tech Elite
iTrader: (4)
Thanks for the info... I did find some info in the manual is there a "standard" procedure for tightening the diffs ? some manufacturers tell you to tighten and then back off x amount of times is there such a thing for x ray to get in the ball park ?? or is it all feel ??
thanks
thanks
Thats a safe rule of thumb as starting points. Bottom out the diff and then back out 1/8th to 1/4 turn out is normally safe starting points.
#3043
Pitcrew, speaking of oneways, I've been routinely racing asphalt/rubber on a track that demands braking at the end of the straight. It's simply a dot hairpin, so very tight, and it's entered at full speed. Does this single corner render a oneway silly to try, or could it still work?
-Adam
-Adam
A one way might be a quicker set up overall. I agree with Korey about a spool in traffic. A one way makes it easy to get out of shape if you have contact.
I personally prefer a diff over a spool. But that is just my feel. Like I was saying, in the circumstance where a spool would be good, I run a diff set up tight. I just feel its easier on the drive train.
And, if you need to use alot of breaking, a spool or diff will be your better choice.
#3044
let me tell you guys somthing this car is the shit i am a nitro race all the way eighth scale onroad is my gig but the guy at our track in florida had several cars and let me run it at the ft meyers track and the car handled like it was on rails it was my first electric race and i ran the fastest lap at a 15 flat most nitro sedans are running mid 15's so i was flying may have to get me one