Corzette Posted January 21, 2005 Share Posted January 21, 2005 Hey guys I have a question. I was pulling a 1.67 60 footer after my stall convertor change. I have the CV upgrade but stock stub axles from my 240Z. At what 60 foot times do the stub axles have the potential to break? Im asking because I want to launch with a 100 shot in first but am worried itll break. With an extra 100 horses I should easily break into the 1.5s or so. Anyone know anything about this before I try it. Track here opens Feb 12th and Im ready to go. The 1.67 was also on a bent pedal so i assume maybe more after a little more practice... CorZette Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted January 21, 2005 Share Posted January 21, 2005 I don't believe there is a finite # where the stub axles break. I would think that if there aren't any casting flaws, they should hold up pretty well. That being said, on your launch, if you run a transbrake, or if you use a solid puck clutch, a lot of shock is transferred through the drivetrain and will find the weak link. If you foot brake and load up the drivetrain before launch, then you have a better chance of loading up. I haven't heard of too many stub axles breaking on a drag launch, but moreso auto crossing due to the different angular forces exerted on the stubs. Just my .02 BTW, I was breaking 280zx outer CV housings and not the 240z stubs I was using when I launched the car. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted January 21, 2005 Share Posted January 21, 2005 BTW' date=' I was breaking 280zx outer CV housings and not the 240z stubs I was using when I launched the car.[/quote'] Me too.... I loaded a short vid in the album section of me breaking one... Quote Link to comment Share on other sites More sharing options...
Corzette Posted January 22, 2005 Author Share Posted January 22, 2005 Roger that, Well I brake stall to 2500 then let go. It flashed to 3500 or so. I usually have no wheel spin. I am just afraid to NOS off the line at this point. Car should be good for high tens or very low elevens on a 100 shot at the right PSI. I guess Ill find out next month. Will post results later... CZ Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted January 22, 2005 Share Posted January 22, 2005 i broke my driver side stub a few years back. didn't realize it until i heard this rattling when i removed the strut to do my coilovers. i've since upgraded to 280z stubs-did that when i installed my rear disc's & cv halfshafts. Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted January 22, 2005 Share Posted January 22, 2005 Z-Gad is dead on. You cannot put a definitve number on this. When I ran CVs with 280 stubs, I broke a CV (the shaft itself, not the tripod) launching with DRs. The DS CV broke and the experts say it is usually the PS that has the breakage, so you never know. As a comparison, I was leaving a lot harder on a t-brake and netting 1.55s. If it were me, I would not leave the line with the 100-shot. I would add a timer to delay the shot for .5 sec to eliminate any shock or wheelspin. If you are truly concerned, then make the swap or look into cryo treating the 240 stubs. Quote Link to comment Share on other sites More sharing options...
Corzette Posted January 22, 2005 Author Share Posted January 22, 2005 Thanks guys...can you tell me where I can go to get them CRYO treated? It may be my best bet... I plan on spraying in second and third...Scottie do you have a website or addy I can contact for CRYO? Thanks in advance... Terry Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted January 22, 2005 Share Posted January 22, 2005 I was thinking about having this done to the RX7 inner and outer ends until I discovered that they are made to a JIS spec that brings them close to 4130 chromoly. Although I did not follow through, I would have looked into a local company, 300below, http://www.300below.com. If I end up breaking a CV shaft then I will have the shafts done as they want $530 for a pair of chromoly CV shafts (just the shafts). CV shafts should run about $60/ea but doubt (hope? ) I will break with the foot brake and DRs. Quote Link to comment Share on other sites More sharing options...
Mikelly Posted January 22, 2005 Share Posted January 22, 2005 Another thing to remember to is that what kills the stub axle is abuse over time... I'd plan to do one of three things: Upgrade to 280 Stubs, Upgrade to 280Stubs that are kryo'ed, or Upgrade to Ross' setup when they come out. Those 240s won't last... I've been through the traps at over 100mph (1/8th mile track) with a broken axle, which also took out the rear brake... I ended up through a fence and in a gravel trap... It was NOT pretty! Good thing it wasn't my car! Mike Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted January 22, 2005 Share Posted January 22, 2005 terry, check out ross' site-he's making upgraded stubs now. http://www.modern-motorsports.com Quote Link to comment Share on other sites More sharing options...
Corzette Posted January 23, 2005 Author Share Posted January 23, 2005 Thanks guys will do..... Terry Quote Link to comment Share on other sites More sharing options...
Z-Dreamer Posted January 23, 2005 Share Posted January 23, 2005 I'm interested in getting Ross' billet 4340 stub axles. So who's interested in a group buy? Mark Quote Link to comment Share on other sites More sharing options...
Corzette Posted January 23, 2005 Author Share Posted January 23, 2005 That would be me...me ....me ...me. I will have to repurchase the flanges as well since mine are for the 240.... Terry Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted January 23, 2005 Share Posted January 23, 2005 I would be interested to know if anyone has used a set yet. I have yet to read of anyone using them. Ross is a first class guy and I don't mind buying something based upon his reputation alone, but how do we know the stub axles are any better than the stock ones? Quote Link to comment Share on other sites More sharing options...
jbc3 Posted January 23, 2005 Share Posted January 23, 2005 I ordered the billet stub axles with a chevy bolt pattern from Ross. The delivery has been pushed back and the latest info is that they are expected the second week of February. Jody Quote Link to comment Share on other sites More sharing options...
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