I have never broken an axle in the past except when something obviously lead to it (like a dry burnout wheel hop) or messed up differential shimming. I would launch on my 6200 rpm limiter with 5 pounds of boost on 24.5x8 MT's on a 6' rim. 1.72 to 1.78 60's every time.
Broke 1 non saginaw last week, replaced with saginaw (so both are saginaw) and one of them broke again. I didn't figure out which one it was yet. First break was on a 7000 rpm clutch dump (not on purpose, nervous on first megasquirt run attempt), then thinking I would be able to pay more attention to the clutch, I wired up the launch control settings and launched at only 4800 rpms this time (but probably with some boost).
Only difference I can see is that last year we were treating the slicks with VHT, and the track seems to be prepping for the midnight races (I never race the expensive day races unless it is test and tune). I know my first 11 was on a prepped surface...
I don't even move off the line. Just hear *bang* and the axle lets go. No wheel hop, nothing. just feel the bang and a slight shudder in the car as the energy dissipates. 8.5 pounds the first time, then 10.5 pounds the second time for boost levels. Never even got there
Not sure whats going on. I always dumped the clutch pretty aggressively before. I was super nervous these last 2 times and the launch control actually made me more nervous so I couldn't do anything but dump the clutch even though I kept thinking "engage it slow."
The clutch is really aggressive, ~900ft/lb holding, so it doesn't give. I am used to my tires lighting up the moment I dump the clutch and spinning throughout first gear.
At this rate I may not get a pass this year since I don't even know if I will hit the track again this year. I don't carry around spare axles because the midnight races are usually too short to bother hustling just to get 1 pass, plus if it breaks again, bah!!!!!
Here is a video of the saginaw breaking. Car moves maybe 1 inch.
The low quality axle broke the splines in the hub (and it looks like pot metal so this does not surprise me) and I am guessing the saginaw broke inside of the transmission like they have in the past.
I ran my 11.54 on that junk type axle last year.
If i could get carbon pucks on my disc I would do it because maybe my clutch is just too aggressive
I have never broken the parts that DSS upgrades. I am hoping its the drivers side axle that broke because it has a boot leak and has taken the previous years pass attempts but I never get that lucky
I will find out in the morning. While I can always lower launch control settings, in the past I was always spinning the slicks and obviously leaving pretty hard. Same exhaust set
Previous year's first pass on a prepped surface. I just feel like something is wrong that these axles are breaking all of a sudden 2 passes/trips in a row.
http://www.streetfire.net/video/ondo...---_647377.htm