Harrison builders - question on stud patterns

[07cob]

Sambo

A number of Harrison's builders (including myself) opt to get the front rotors redrilled and the studs replaced with nissan studs. This means all PCDs are the same as are the threads on the studs.

I have even gone so far as to procure a space saver wheel from a Skyline!! Although as Craig has pointed out, I am not too sure how the 10" with a flat will go in the boot!!!

I am currently in the process of purchasing wheels and the offsets I am using are 135 (rear) and 90 (front) - by advice from Warwick himself. This does not take into account the *tyre bulge* that will set these back a little further, depending on what size rim and tyre you are running. I am planning on running 225/50x16s and 255/50x16s on 8s and 10s respectively so I reckon about 10mm will be enough. Hence I have ordered offsets of 125 and 80. If you choose to run with 17 or 18s, the bulge will be less and if you want 15s, it will be a bit more I am guessing. You can run 15s on the Nissan rear end, you just need to have some mods done to move the caliper closer to the wheel centre - the recently finished Daytona has 15s all round.

Hope this helps

GeoF

[400TT]

Originally Posted by 07cob

Sambo

A number of Harrison's builders (including myself) opt to get the front rotors redrilled and the studs replaced with nissan studs. This means all PCDs are the same as are the threads on the studs.

GeoF

Geof, I didn't realise you did that. One advantage of getting same stud pattern front & rear, is that you can purchase a cheap 2nd hand set of wheels to use for racing.

On the Harrison that I built with my brother we didn't have any of these dramas. Used Skyline R32 GTR rear, with R32 Skyline aluminium uprights & hubs on the front. So run Skyline R32 rotors & calipers front & back and of course we have Nissan stud pattern front & rear. That's how we solved the problem. We also run an ABS sensor on the front and of course on the rear. Started off using oem cross-drilled GTR rotors, now using slotted DBA 4000 rotors.

[sambo]

Geoff - redrilling seems like a viable option, thanks for the info!

Craig - how much work was involved in converting Warwick's front-end to use R32 Skyline aluminium uprights & hubs? Were you using the ABS sensors for ABS, traction control, speedo...? I'd love ABS to go with a nice power steering setup.

Thanks guys

[400TT]

We did it on his previous version front suspension. Our front suspension has fabricated upper and lower "A" arms and at that stage using HQ stub axle. Warwick now uses fabricated straight lower arm with control rod(z bar) and commodore hub & upright assembly and that upright to upper "A" arm adaptor.

The advantage of Skyline uprights is:
* Less unsprung weight
* Skyline brakes fit straight on, so get 300mm rotors & 4 piston calipers. Skyline GTR V-Spec also had larger brembo brakes.
* Easier to fit abs sensor, but now with that Commodore upright, it would have abs sensor mounting, if it's a late enough model.

The disadvantage of Skyline uprights:
* Work & expense involved in fitting it.
* More difficult for parts e.g. wheel bearings etc.

For a street driven Cobra, Warwick's standard setup with Commodore brakes etc is fantastic bang for the buck.

We use one of the rear Skyline ABS sensors for speedo and use the front and rear sensors for traction control. Well that was the plan, but the version of Autronic SM2 ecu we have is buggy, traction control doesn't react. We can see the ecu detecting the wheel speed difference between front & rear, but ecu does not try to correct it be retarding the ignition etc. Didn't bother with abs, but people have done it.

[sambo]

Craig, sounds like the Commodore discs will be fine after a redrill, for my needs anyway. I might even save another 57g from the extra drilled out stud holes.

I'm hoping to visit the Harrison shop next Friday 9th so I'll quiz Warwick on the ABS setup - along with 100 other things.

[macloft]

Sambo
As Geof says Warwick will redrill your front Commodore hubs and replace with the Nissan studs (stud price $50). He currently has a car he is building right now with this change incorporated plus many other refinements to his standard package
I have just recieved Harrison Chassis 72. I am extremely happy with Warwicks
proffesionalism. There are many car options you can explore with him and yes talk to him directly as he is very approachable.

[sambo]

Thanks Macloft - and yes, I've had half a dozen emails with Warwick and will be getting the 50mm lowered floor. The revised stud pattern and extra camber are also on the cards. So many things to think about aren't there? Part of the fun I guess...

[400TT]

Originally Posted by sambo

I'm hoping to visit the Harrison shop next Friday 9th so I'll quiz Warwick on the ABS setup - along with 100 other things.

Yep, make sure you write a list, that's what we used to do.

[Aussie Mike]

Why not re drill the rears to the Holden pattern? There are heaps of wheels available for the Holden pattern as it's the same as BMW.

Cheers

Michael