99-01 Cobra IRS

[jeffdg]

My search on Cobra years (specifically, 99, 00, 01) seemed to suggest that the early IRS was 'not-as-good' as later years...

Can anyone fill me in on the details. Did the IRS indeed "improve" in 00 or in 01?

I'm considering one of these years Cobra for an open track car, *NOT* for drag.

 

[COBRA90GT]

'99 = 28 spline
'01 = 31 spline

'03/'04 = 31 spline

Many 99/01 owners who chose to run with the IRS at the dragstrip upgraded to GKN (or similar) halfshafts because they were stronger, here's a link:

http://www.need-4-speed.com/gkn.htm

I forget the exact details but the 03/04 halfshafts were "beefier" at a certain area so that they weren't as prone to breakage like the 99/01 halfshafts. That being said, an 03/04 halfshaft can still snap given enough power due to wheel-hop & twisting forces.

I know you mentioned opentrack/roadracing material, but the above info should be somewhat useful. Be sure to check out the folowing pages for further info:

1 - Joe Lynch's site (excellent tech info, mostly drag racing related but still great to bookmark if you have an IRS)

http://www.lx.net/jlynch/

2 - The Cobra "R" section of the SVTPerformance msg board (lots of good info among the 2000 Cobra R owners and their experience with the '00 R IRS; looks like their msg forums are currently down though):

http://www.svtperformance.com/forums/index.php

#3 Visit the Corner Carver forums, plenty of info pertaining to IRS & racing applications (search button):

http://corner-carvers.com/forums/index.php

#4 Corral Roadracing forum (search button):

http://www.corral.net/forums/forumdisplay.php?f=304


Between all of the above sources, you should have a better idea about what to expect when open-tracking an IRS equipped Cobra and how to improve it...g'luck!

 

[jeffdg]

This is great!
Thanks a ton.
-Jeff