Tony is headed exactly in the right direction. Several things are accomplished by going to a 996 hub strut assembly.you eliminate spread that occurs (toe out) under heavy braking with high grip tires (non DOT wide slicks) and more parts are readily available for the 996. Vision did this on the Orca car.

 

what does a set of gt3 six pistons sell for these days?

 

One big problem I just cam across in "braining out" the 996 conversion is that I just realized that while my wheels will fit over the 14" rotors and GT3 brakes fine... they won't fit on the car under the fender.

Going to the 996 front end would require a wide body conversion for 100% sure if I were to use a large front tire (which I need to do and am currently doing...).

When I tried the Cup2 17x9 tire on the 996 GT3 with the 14" GT3 brakes... it fit fine with a 3/8" spacer (which is what I run now). But I was only looking for brake clearance. I wasn't looking for strut clearance!

My wheels are 2" wider on the inside (17x11"). That means that I would need an additional 2" of strut clearance... which there is not. In fact, with a 3/8" spacer... the wheel barely cleared the strut.

That means that the wheel will have to be pushed out 2" OR I need a wheel with 2" more positive offset.

A wheel with 2" more positive offset in the front, means that a) I'd need a rear wheel with 2" more positive offset, and b) my wheels would be sticking out of my body (by a long shot as my current front fenders are 1" wider than stock currently).

And I'm not sure I could even get that sort of wheel track under the Broadfoot flare kit. I think I'd probably have to go to a full on real wide body kit.

And then... yeah... I'd need all new wheels.

So.... to sum it up: going to a 996strut/hub conversion with probably anything bigger than a 255 up front +/- will require new wheels to gain the proper offset, which will require a car that has a wide body to clear the new tires.

so much for that....


TonyG

 

$600-$700 used... for the calipers.


TonyG

 

Ok... I'm walking funny...

(2) two new 87 951 non-M030 spindles from Porsche = $1300 OUCH
(2) priority shipping @ 15% extra = #208 OUCH OUCH


Talk about a rip...

TonyG

 

http://www.volkspage.net/technik/ssp/ssp/SSP_381.pdf

 

Tony, I reckon you could do your wheels under your wider stock fender and the B/foot kit. Or just go their Daytona GTR fender kit. I sort of wish I'd just done that from the start. Then I could run wider and lower the car as well.
I like your idea overall and wonder how much it would cost to do it all. Not sure how many guys would go this far, but could be worth asking around?

I think I've got enough clearance between wheel rim and coils to do it.

I like that idea you mentioned about the rear suspension too. That should be pretty easy to knock up.

Lastly, on your mission to install the Boxter ABS. If you go up to GT3 Calipers isn't there a chance of 'confusing' the brain or even having an adverse effect due to differences in piston size?
Is it a Bosch unit? Might be worth contacting Vaughan who is 924RACR on this site. He works with Bosch ABS so he'd be a good person to talk with.

 

Caliper piston sizes have zero effect on the ABS.

The ABS only reacts to the difference in wheel speed of one or more wheels, in relationship to the other wheel speeds.

As far as wheel clearance goes:

I seem to recall that the Broadfoot GT2 fender flare kit (the one you have) only adds 1" to the front fender width (again... from memory since I've never seen that kit in person). In any case... I would need 2" more fender coverage than I have now (and I already have 1" wider-than-stock fenders now up front).

So it's not just the wide body kit I would need. I would also need a completely new set of wheels with a dramatically different offset. And I'm sure that would require a new setup to get the handling correct, etc...

It's a pretty big can of worms to open.... unless you don't mind throwing another $10K-$15k at the car :-)


TonyG

 

Are you sure about that with the ABS? Not arguing, just thinking out loud.

Yes, you will need new wheels but I thought you could get a similar set to the ones you run but with the widening done differently to build in the appropriate offset...and 18" perhaps.
They didn't sound too expensive to get made up. For better or worse, it sounds like you will need to address your current braking with the new motor being a little bit quicker than the last.

 

Thanks Pat. I have one of these mounted straight on the middle of my wheel as a data logger. It was designed for superbikes, works with gloves on and is truly superb as a track data logger. http://www.racechrono.com.au/

What's the eta on your car appearing at a club event?

 

Yes, ABS only cares about wheel speed. It doesn't care how you lock up a wheel, if you have large or small brakes, powerful or not etc.

 

Good to know. If Tony can get this Boxter abs to work it will be a great addition to our cars.

 

In regard to ABS. Most of the paddock in Grand Am Continental Challenge use BMW ABS from the E46. This is the route that I plan to take. I am putting together a list of parts to do this.

 

That is a popular ABS. Especially the BMW Motorsports ABS is supposed to be very good. But it's expensive.
The E46 M3 ABS is probably a good choice, but should be more complicated and expensive than the Boxster ABS route.

 

Yeah.... the E46 ABS is great... but nobody in the POC (and there are a LOT of drivers from GrandAm-AMLS-Rolex in 996 GT3/Cup-997GT3/Cup....) that don't run anything but the Porsche ABS (even on cup cars that didn't come with ABS from the factory).

You can get the Boxter/911 ABS for cheap ($100 on ebay). Once you plumb it up... changing it over to another ABS is fairly trivial if you don't like it.

My point being... it's easier to take the plunge with a $100 abs pump.


Anyway..... my ABS is now mounted behind the dash, on the center tunnel behind the center console (which I don't have but if I did, it would be behind that). Easy access, and hidden out of view.

Just got my brand new non-M030 spindles from Germany. Waiting on my 9m 996GT3 caliper adapters. I have everything else to install full tilt front & rear Mk2 996 GT3 brakes sitting in my garage.

Just waiting on TRE to finish up plumging my ABS and the rest of the install will proceed! YEAH!!!!!!

I'm so damn tired of cup cars putting the hurt on me in the braking zones.... well.... I have a little something for them in 2012.... mu ha ha

TonyG