Guest 2002sentraSER Posted January 30, 2003 Share Posted January 30, 2003 i am trying to find out if you need a solid axle or can stay with a irs Quote Link to comment Share on other sites More sharing options...
johnc Posted January 30, 2003 Share Posted January 30, 2003 Join the NHRA. You get the rule book as part of your membership. Quote Link to comment Share on other sites More sharing options...
dmanzo57 Posted January 30, 2003 Share Posted January 30, 2003 I think 10.99 or quicker needs a solid axle. Don Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted January 30, 2003 Share Posted January 30, 2003 I think 10.99 or quicker needs a solid axle. ....so why are they mandating "stock suspension" in the Sprot Compact Sport RWD class? Just about all the fastest cars in that class will be IRS and should be in the 8s Quote Link to comment Share on other sites More sharing options...
denny411 Posted January 30, 2003 Share Posted January 30, 2003 I don`t see the fairness. The front drivers that are running sub 11`s have independent suspension. Why should rear drivers have to switch out what came stock on their cars? A failure of either would just as troublesome. Quote Link to comment Share on other sites More sharing options...
z ya Posted January 30, 2003 Share Posted January 30, 2003 So we are good to go than huh Don??????? Quote Link to comment Share on other sites More sharing options...
fl327 Posted January 30, 2003 Share Posted January 30, 2003 70-78 zcars dont have upper control arms Quote Link to comment Share on other sites More sharing options...
dmanzo57 Posted January 30, 2003 Share Posted January 30, 2003 I would consider the strut to be the upper control arm. I don't know what NHRA thinks... Don Quote Link to comment Share on other sites More sharing options...
jimzdat Posted January 31, 2003 Share Posted January 31, 2003 I've got the 2002 rulebook sitting on my desk, but I'm not exactly sure what class the Z fits in--if someone knows that info, I'll get you the exact specs out of the rulebook Quote Link to comment Share on other sites More sharing options...
dmanzo57 Posted January 31, 2003 Share Posted January 31, 2003 Jim, It should be under E.T. Don Quote Link to comment Share on other sites More sharing options...
jimzdat Posted January 31, 2003 Share Posted January 31, 2003 OK, from the 2002 rulebook, E.T. class: "Cars running 10.99 or quicker that weigh more than 2000 pounds with IRS without upper and lower (both) control arms must replace swing axle differential with conventional differential housing assembly. Cars with IRS using upper and lower (both) control arms may retain swing axle assembly regardless of weight or e.t." That is for Super Pro, Pro, Sportsman classes, running 7.5 or slower Looks like you'll have to switch out that axle to compete in NHRA--sorry BTW, it also states that you must retain at least on operating hydraulic shock absorber per wheel--rigid mounted suspensions are prohibited The rule book also has contact info for the various divisional directors and tech leaders--they may be able to tell you if the strut will act as a control arm, but I honestly dont think it will count--if you want to call them, let me know what state you are in and I'll post the info if you need any of the other specs, let me know and I'll look em up for you Quote Link to comment Share on other sites More sharing options...
denny411 Posted January 31, 2003 Share Posted January 31, 2003 I wonder what the IHRA rules are on this? Quote Link to comment Share on other sites More sharing options...
dmanzo57 Posted January 31, 2003 Share Posted January 31, 2003 I found some more info at NHRA.com... NHRA finalizes 1999 rules changes 9-7-98 INDIANAPOLIS - The NHRA General Rules Committee finalized rule changes for the 1999 racing season at a meeting Wednesday night during the U.S. Nationals. Details on some rule changes are still being ironed out, but highlights of the changes are as follows. E.T. Brackets A long-standing rule that requires any car with independent rear suspension (IRS), weighing over 2000 pounds, and running 10.99 or quicker to replace the IRS with a conventional rear-end housing has been modified. For 1999, only those IRS designs which utilize a lower control arm only (like a 1963 to 1982 Corvette) will have to comply with the above requirement. If the suspension utilizes both upper and lower control arms, the IRS may be retained regardless of weight or e.t. Don Quote Link to comment Share on other sites More sharing options...
Guest 2002sentraSER Posted February 1, 2003 Share Posted February 1, 2003 because i plan on running between 400-500 wheel power in my z with a stipped interior and slicks so will i have to have a solid axle in the dc metro area Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted February 1, 2003 Share Posted February 1, 2003 I would think that for the purpose of safety the rule was designed for, that in the case of the Jag and Vette, the halfshaft serves AS a control arm to locate the rear hub lose one and the wheel goes every which way. In the case of the Z - the strut serves as the other, and losing an axle (heaven forbid) would not affect the orientation of the wheel in any plane, so should be ok. Of course, they probably don't want us stomping all over their current patrons, so I wouldn't be surprised if they say no - in spite of logic. Quote Link to comment Share on other sites More sharing options...
Guest 2002sentraSER Posted February 3, 2003 Share Posted February 3, 2003 thanks for the info helps a lot Quote Link to comment Share on other sites More sharing options...
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