Does anyone make a boxster caliper adpater for 3" struts?

[Acox914]

i heard that they did exist at one point, but from my research, they only exist for 3.5" spacing struts...

Any info? is it impossible to do?

if impossible, would the hubs on my 73 boge suspension transfer to a later 3.5" spacing? what about the koni reds i have hiding in there, do they drop in to a later 3.5" housing?

next question, has anyone cut off the caliper ears and welded on a new mount for the radial mount calipers?

Thanks!

Aaron Cox

[Acox914]

bump

anyone know about the insert interchange between 3" and 3.5" struts?

[Vipergrün]

Try Dave at TRE MotorSports (www.tremotorsports.com)

[Acox914]

their kit requires 3.5" struts

[jpnovak]

From VCI's website.

VCI-6600 Caliper Adapter - 3.5" mounting (big brake strut only)

For mounting Big Red or S-4 calipers on 77-up all. Plus "S" Bilstien struts all years
$249.00 pr

VCI-6601 no pic same - 3.0" mounting for/early cars - special order $299.00 pr


I think the dimensions may be different for a 993 vs boxster caliper but don't know for sure.

[Acox914]

thanks for the lead, i will give VCI a call.

[TRE Cup]

We found that the 3 inch spacing of the mounting ears would interfere with the inner pad and supports of the Boxster calipers when we did some prototyping. Thinking about clocking the caliper further upwards (similar to what we do with the rear) so we get the correct spacing. But that's about a month away and we don't know if that will work yet

I am certain the VCI's adaptors will work well with either the S/ A caliper conversion or the larger rotors used with the big red conversions
Doug makes great stuff

[Paul Thomas]

What rear caliper would be a good match for the Boxsters in the front?

Paul

[Acox914]

VCI responded... no such luck.

"Hi Aaron,

No i'm sorry we never did anything for the Boxster calipers.... those adapters wouldn't work unfortunately."


aaroncox wrote:
> Hi there,
>
> your company was recommended to me in my search for adapters to put Boxster (non S) calipers on an early 911 front strut (3" spacing).
> you have an adapter- for big red/s4 calipers, is this the same as a boxster caliper?
> VCI-6601 same - 3.0" mounting for/early cars - special order
>
> Please let me know,
>
> Thanks for your time
> Aaron Cox
_________________________________________________

TRE, i would be very interested in the "reclocking" adapter, or i will have to go the weld a new radial mount route...

anyone know if early koni red inserts will drop into a lalter housing?

[V12man]

Hi

i had some built for my '67 locally - it was not too difficult to achieve.

On my car the caliper mount plate is removable (I suspect there are differences between the struts available on the early cars) - We made a new one which spaced the ears out further from the hub - then a simple aluminium block to mount the caliper bolted to that. One has to remember to swop the hard line on the caliper around as well. The dust covers are removed.

On the rear we sort of copied TRE's solution of rotating the caliper almost to the top of the disk. One thing we had to do was make an internal spacer to move the disk outward by 10mm - this fits between the hub and the disk.

I can photograph this setup if anyone is interested.

With Pagid Orange pads I have not had any issues with oveheating (Motul 600 fluid) on the track yet after 2 years of use - despite not having any air ducting to the brakes. I was originally concerned about not haveing enough thermal reserve in the disks (20 & 24mm) but with my light car it's been ok so far.

[Acox914]

Guy, i would love to see the pics of your setup!

AA

[TRE Cup]

It's been covered in quite a few threads about what calipers work with X front and Y rear.
But in short to save some search time: If you install Front boxster calipers on the front ONLY- you WILL have a bias balance problem and lock up the front prematurely. If you are not careful (and how can you be 100% of the time in the real world?) you can easily find yourself with longer brake distances over stock and getting in trouble!
"what about a bias valve?" - ok- sure- now you have reduced the front pressures to where your effective braking is MAYBE the same as what you started with !

So... You can play with installing various rear calipers , with or without, bias valve that approximate the surface area and piston area of the boxster rear caliper- or just find yourself a complete set of boxster calipers and enjoy a balanced system

With over 175 kits sold in the past 4 years, the only time we hear negative comments from owners was ONE turbo-ed full boat targa (read heavy car) owner at Arizona Motorsports Park; a super tight flat autocross course where the brakes were continually punished for multiple laps.
Then again multiple PRC (Porsche Racing Club) racers enjoy this system on their cars at tough tracks like Infineon.

Are there better brake systems? You bet ! But for the lighter car niche where wheels sizes, fender width, and budget poses the question, the boxster set up is the answer

[V12man]

OK - I had a go at taking some photo's - not as successful as I would like for a couple of reasons:

I am putting a new motor in the car - changing from a 2.2S motor to a 2.7 which is carbed, and the car is on jack stands.





So I crawled around with my phone on night mode - and now I have discovered when downloading the photo that the one's of the front are useless - so i will have to repeat it when the motor is in and I can get better access.

I use Boxster front and rear, and orignially had too much rear bias - so I have added a bias valve to the rear.

Rear bracket - welded steel.








Front bracket

Basically the front bracket is a simple aluminium piece (similat to the TRE piece, but we did replace these pieces to move the ears further out to attach the bracket. I suspect these are not all the same on the early cars front struts and may not be removable.





I will take better pictures and post them soon.

[Acox914]

interesting....


does anyone have any experience welding on an adapter like this?

anyway to minimize warpage but still get a very good strong weld?

[DJ911]

Resurrecting this old thread to see if anybody knows if there is now anybody selling adapters for 3" struts to take Boxster Callipers, front and rear. Looking at upgrading the brakes on my 1970 911T. My local shop can and has fabricated adapters in the past, but thought I would check for something off the shelf first.

Cheers,
Dirk

[Joe Bob]

This thread has grey hair....

Pretty sure Eric has this. www.pmbperformance.com

[DJ911]

Hi Joe, I know Eric has a brake kit that will fit 3" front struts, but can't see any reference on his site to adapters suitable for Boxster Callipers on 3" struts. Do you know different?

Thanks,
Dirk

[Joe Bob]

I would email or call him, suggest 3am our time, tell him I said that was best...