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Diomedes

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About Diomedes

  • Birthday 04/04/1985

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  1. RCVD has a very mathematical approach. Tech tips and carroll smith's books are more in line with this thread's discussion. Start with those.
  2. I'd love some more info about this Edit: Should have searched harder. http://www.importperformancetrans.com/nissanauto.shtml#main http://www.automatictransmission.com.au/release.asp?NewsId=8295
  3. Diomedes

    Balltec LSD

    It's a diff very similar to a cam-and-pawl unit. We used to use diffs very much like this in our FSAE car. We'd get them from some kind of Honda ATV vehicle. It's already been pointed out how the balls in the carriers slide back and fourth, allowing the two outputs to rotate opposite to each other. When torque is applied to the input, and one wheel overspeeds, the unit jams up, and puts the torque to the other wheel. They are a torque biassing diff; they behave much like a torsen. I believe this is why there are clutch packs in the sides of this model; so there is some preload if one wheel jacks. The good thing about cam and pawl diffs is they're light. As you can see, there's not much to them. The bad thing about them is they don't last long. They're steel-on-steel. This design is better than most, as it uses ball bearings instead of "pineapple pieces," so there's more rolling and less sliding, but I still wouldn't expect it to last long. Also, when they wear, they allow more slip, which causes more wear, and the spiral continues, until you end up with an open diff. I could be wrong, though, these might last, who knows? Here's a thread on another forum that shows the ATV cam and pawl, as well as some discussion: http://forums.autosport.com/showthread.php?threadid=101634
  4. I don't have much experience with heavy cars, but a performance increase resulting from adding weight could also be a sign of your tires being too big, or too hard a compound, right?
  5. I guess I must be doing something stupid. I weld a threaded lug into/onto a tube, and let it cool. I then put a bolt *all the way into the lug with my fingers*, no resistance, but then when I go to take it out, it seizes and strips the thread. What the hell is going on here?
  6. oh I forgot. Photos on my photobucket account. http://smg.photobucket.com/albums/v142/Diomedes/
  7. OK. So... I couldn't get photos of suspension, or drivetrain. The entire underbody is covered by an undertray. There's a diffuser on the back, an airdam on the front, and sideskirts. So no photos for you. I talked to the man himself, Kevin Mackrel. He uses a chevvy V8 6 litre, according to the sticker on the hatch, a transfer case from a Hilux, and a powerglide 2 speed transmission. The chassis and suspension is still all essentially datsun. R200 rear, and R180 front. The hubs... "converted to 6 stud" in his words. The CV's I think are subaru. So there. It's simple, basic, mechanical, no-bullshit, and fast enough to be kicked out of every dirt-racing event there was, which is why he hillclimbs. The most interesting think I take away from this is that he runs an R200 on the rear, and r180 front which take the 700+ AWHP (according to dyno). He didn't mention any breakages of diffs. I didn't get to talk long, but there you go.
  8. I *might* be going to a hillclimb in Morwell on saturday. I bet he'll be there. Is there anything you want photos of?
  9. I've had the pleasure of seeing this car compete at a few hillclimbs. It's a weapon, for sure. Consistently one of the fastest cars, and always gets the most attention.
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