How would you build a DSP AUTO-X Z

[rjracin240]

Keeping my fingers crossed that the Z gets moved to DSP; would like to get idea's from everyone as to what components, brands, and sources of supply you would use to build your Z wether hypothetical or you join the crowd and run for real's

[John Coffey]

Early 1973 240Z chassis.

Welded in roll bar.

Bogart or Keizer 15 x 10 wheels.

Hoosier A6 275/35-15 tires.

Penske 8760 triple adjustable shocks.

Custom tubular ARBs.

Camber plates.

Early 240 short steering arms.

Late 280Z 4 speed.

Aluminum flywheel.

Quatermaster 7.25" double disc clutch.

3:54 R180 with OSG Super Lock.

N42/N42 head/block combination.

"C" cam.

Head cut to manufacturers or SCCA limit.

Block overbored to SCCA limit.

Custom intake manifold.

60mm TB.

Stahl header.

3" exhaust.

Motec engine managment.

Race seats.

Race harnesses.

...and more.

[jmortensen]

Why the 73 chassis out of curiosity? The series I would be lighter.

[Arne]

Why the 73 chassis out of curiosity? The series I would be lighter.

I was wondering the same. Factory rear sway bar mounts, maybe?

And would the weight difference be all that great once the bumpers were stripped off?

[John Coffey]

Stiffness - you can run bigger springs and bigger tires. Vic Sias' BSP winning 240Z was a 1973. Its important to avoid the later 73s to keep from getting the bigger bumper reinforcements.

[jmortensen]

And would the weight difference be all that great once the bumpers were stripped off?

Seems to me that the series one is significantly lighter than the later cars. One guy on Hybrid Z had his early F/Prepared Z hovering around the 1900 lb mark. I believe Steve Carlson in Fresno is under 1900 lbs also. I don't know the D/SP rules, it might not even be an issue if the min weight is 2200 lbs or something...

[John Coffey]

SP requires full interior, metal body panels, etc. You can't compare a car built to Prepared. My old series 1 1970 240Z's previous life was as Erik Messley's BSP car. It weighed 2,260 lbs in full SP trim and Erik won a few National Tours and Pro Solos with the car back in the mid 1990s. When Vic brought his car out in the later 1990s it was faster then Erick's for a variety of reasons. One big one was that Vic could run wider tires and stiffer springs the Erik's car. Vic's car weighed in around 2,380 if my memory is correct.

[rjracin240]

SP requires full interior, metal body panels, etc. You can't compare a car built to Prepared. My old series 1 1970 240Z's previous life was as Erik Messley's BSP car. It weighed 2,260 lbs in full SP trim and Erik won a few National Tours and Pro Solos with the car back in the mid 1990s. When Vic brought his car out in the later 1990s it was faster then Erick's for a variety of reasons. One big one was that Vic could run wider tires and stiffer springs the Erik's car. Vic's car weighed in around 2,380 if my memory is correct.

John,

Trying to understand your concern about tire width, since it is Street Prepared you are allowed to flare the fenders, are you looking to put the wheel tire combo you proposed under stock fenders, or are you considering offset so that you can run deeper back spacing?

Is the weight penalty of your welded in rollbar offset by the rigidity it would add to the body?

Any suggestions for a strong regional car setup, those shocks alone would kill my budget for a couple of years!

Thanks for the comments was hoping that you would pipe up when I started the thread.

[John Coffey]

Trying to understand your concern about tire width, since it is Street Prepared you are allowed to flare the fenders, are you looking to put the wheel tire combo you proposed under stock fenders, or are you considering offset so that you can run deeper back spacing?

Its a more fundamental issue. Wider or stickier tires require more spring rate to get the most out of them (the tires). Without more spring you're essentially carrying more unsprung weight with the wider tires and not getting the corresponding grip increase.

Unfortunately the series 1 cars, even with STBs and a welded in roll bar, are limited to about 300 lb. in. on spring rate. This limit is mainly from the front of the car where triangulated front STBs are not allowed in SP.

[f1race79]

What about a ZX?

Would it be too heavy?

[Curtis240Z]

If I remember correctly, the short steering arms are not legal along with traditional camber plates.

[John Coffey]

Update/backdate. Very early 240Z arms are shorter by a little bit.