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RX7 Caliper Swap
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RX7 Caliper Swap
xschop Tue Nov 03, 2009 11:48 am
I will be working on the rear Big Brake upgrade to compliment the Lexus Front swap soon. I'm diggin these calipers, just like the Lexus Ls430 calp, these are substantial and lightweight all alloy .....and 160 bucks for the pair loaded with pads... 
Stay tuned
Stay tuned
xschop- Posts : 2711
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Location : OKC
modenas- Posts : 285
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Age : 35
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Re: RX7 Caliper Swap
Porch Wed Nov 04, 2009 9:20 am
Looks good!
Just out of curiosity, why are we not just bolting front 951 calipers on the rear?
Just out of curiosity, why are we not just bolting front 951 calipers on the rear?
Porch- Posts : 851
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Age : 42
Re: RX7 Caliper Swap
xschop Wed Nov 04, 2009 9:24 am
PORCH said...........Looks good!
Just out of curiosity, why are we not just bolting front 951 calipers on the rear?
Chop's reasoning........160 bucks for the pair loaded with pads...NIB and included shipping!
Just out of curiosity, why are we not just bolting front 951 calipers on the rear?
Chop's reasoning........160 bucks for the pair loaded with pads...NIB and included shipping!
Last edited by xschop on Wed Nov 04, 2009 9:52 am; edited 2 times in total
xschop- Posts : 2711
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Re: RX7 Caliper Swap
Porch Wed Nov 04, 2009 9:51 am
Ohh, i see! Are the front 951 calipers that expensive?
Anyways, i guess it makes more sense if you don't already have a set of 951 calipers
Anyways, i guess it makes more sense if you don't already have a set of 951 calipers
Porch- Posts : 851
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Age : 42
Re: RX7 Caliper Swap
xschop Wed Nov 04, 2009 9:54 am
Rebuilt 951 calps and new pads are up there....$$$
My trusty swap manual is at home. What are the 951 front piston sizes again?
Also, anyone know the 951 pad dims?
On top of that another 7-8mm can be trimmed off the face of the RX7 calps if needed for more rim clearance, but looking at the 951 front calp pics, those calps accept a wider rotor and look like there is less rim clearance on those even in that dimension.
My trusty swap manual is at home. What are the 951 front piston sizes again?
Also, anyone know the 951 pad dims?
On top of that another 7-8mm can be trimmed off the face of the RX7 calps if needed for more rim clearance, but looking at the 951 front calp pics, those calps accept a wider rotor and look like there is less rim clearance on those even in that dimension.
xschop- Posts : 2711
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That Damn 86T again.....LOL
xschop Wed Nov 04, 2009 1:53 pm
I found the info I needed on piston sizes, I just am curious what the brake pad size comparison is between rear Brembo Turbo calipers and these RX7 calipers....
Porsche Piston Sizes for Early Brembo Calipers......
928 86- VIN#F 92GS8 61000 - model year 87: Front Caliper 42mm and 36mm
Rear Caliper 30mm and 28mm
88 Front Caliper 44mm and 36mm
Rear Caliper 30mm and 28mm
930 and Carrera Turbo look: Front calipers: all 38mm pistons
Rear Calipers: all 30mm pistons
944 Turbo:
Front Calipers:
'86 Turbo 38mm and 36mm
'87-88 Turbo 40mm and 36mm
'88 Turbo S 44mm and 36mm
'89 944 S2 up to VIN # >> 94KN4 51880 40mm and 36mm
Rear Calipers:
'86-88 Turbo and Turbo S 30mm and 28mm
'89 S2 up to VIN #>>94KN4 51880 30mm and 28mm
Porsche Piston Sizes for Early Brembo Calipers......
928 86- VIN#F 92GS8 61000 - model year 87: Front Caliper 42mm and 36mm
Rear Caliper 30mm and 28mm
88 Front Caliper 44mm and 36mm
Rear Caliper 30mm and 28mm
930 and Carrera Turbo look: Front calipers: all 38mm pistons
Rear Calipers: all 30mm pistons
944 Turbo:
Front Calipers:
'86 Turbo 38mm and 36mm
'87-88 Turbo 40mm and 36mm
'88 Turbo S 44mm and 36mm
'89 944 S2 up to VIN # >> 94KN4 51880 40mm and 36mm
Rear Calipers:
'86-88 Turbo and Turbo S 30mm and 28mm
'89 S2 up to VIN #>>94KN4 51880 30mm and 28mm
Last edited by xschop on Sun Apr 04, 2010 10:41 am; edited 1 time in total
xschop- Posts : 2711
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Location : OKC
Re: RX7 Caliper Swap
Dawgz83948 Mon Nov 09, 2009 12:51 pm
xschop wrote:I found the info I needed on piston sizes, I just am curious what the brake pad size comparison is between rear Brembo Turbo calipers and these RX7 calipers....
Porsche Piston Sizes for Early Brembo Calipers......
928 86- VIN#F 92GS8 61000 - model year 87: Front Caliper 42mm and 36mm
Rear Caliper 30mm and 28mm
88 Front Caliper 44mm and 36mm
Rear Caliper 30mm and 28mm
930 and Carrera Turbo look: Front calipers: all 38mm pistons
Rear Calipers: all 30mm pistons
944 Turbo:
Front Calipers:
'86 Turbo 38mm and 36mm
'87-88 Turbo 40mm and 36mm
'88 Turbo S 44mm and 36mm
'89 944 S2 up to VIN # >> 94KN4 51880 40mm and 36mm
Rear Calipers:
'86-88 Turbo and Turbo S 30mm and 28mm
'89 S2 up to VIN #>>94KN4 51880 30mm and 28mm
EDIT: I just checked and the RX7 calps are tapped M10 x 1.0 for the stock 944 brake lines even
So what all do we need?
Dawgz83948- Posts : 603
Join date : 2009-06-08
Location : Ca.
Re: RX7 Caliper Swap
xschop Wed Mar 17, 2010 10:16 pm
OK. I've searched all over, and can't find that damn 86 Turbo REAR Rotor offset (AGAIN!). Greg's manual
(Brembo confirms) .....says the 87-up turbo rears are 299x24 with a 100mm offset (wheel face to rear rotor face)
Anyways, I mocked up the RX7 calipers for a set of brackets for the 85.5 NA rotor (289x20) which makes for a FUGLY looking bracket to do it.
And I need to know 100% if the 87-up Turbo rears will bolt up to the 85.5 NA (and hand brake still work)so I can get (I think 24 or 26mm more backspacing to make a better designed RX7 Caliper bracket ??????
(Brembo confirms) .....says the 87-up turbo rears are 299x24 with a 100mm offset (wheel face to rear rotor face)
Anyways, I mocked up the RX7 calipers for a set of brackets for the 85.5 NA rotor (289x20) which makes for a FUGLY looking bracket to do it.
And I need to know 100% if the 87-up Turbo rears will bolt up to the 85.5 NA (and hand brake still work)so I can get (I think 24 or 26mm more backspacing to make a better designed RX7 Caliper bracket ??????
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Location : OKC
GRD Eng.
xschop Fri Mar 26, 2010 11:32 am
I should be getting my 86T rotors today and will confirm the HAT offset of 74 or 75mm and finalize the adapter bracket design. I found out with Dawg's help that the later 87-up Turbo rotors will hit the Arm alloy first if trying to install them at 100mm offset....
EDIT the 72mm total offset and 24mm thick rotor requires more tweeking. I radius a Semicircle in the design to get the RX7 mounting ears to clear the adapter bracket with hopefully no to very little trimming....we'll see....
One reason why I chose the RX7 4x36 for the rears....Same company that makes the BIG monoblock Lexus LS430. The alloy construction is quality....
The RX7 4x36 will fit right where the stock single 36mm piston caliper went...
And Larger Rotors can be put on later or these even put on the fronts with spacers in between the halves (This is the same method Wilwood and Brembo uses)...
EDIT the 72mm total offset and 24mm thick rotor requires more tweeking. I radius a Semicircle in the design to get the RX7 mounting ears to clear the adapter bracket with hopefully no to very little trimming....we'll see....
One reason why I chose the RX7 4x36 for the rears....Same company that makes the BIG monoblock Lexus LS430. The alloy construction is quality....
The RX7 4x36 will fit right where the stock single 36mm piston caliper went...
And Larger Rotors can be put on later or these even put on the fronts with spacers in between the halves (This is the same method Wilwood and Brembo uses)...
Last edited by xschop on Mon Mar 29, 2010 3:23 pm; edited 1 time in total
xschop- Posts : 2711
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The Mic Don't lie
xschop Fri Mar 26, 2010 12:24 pm
I always wondered why I've seen conflicting offsets from different sites on the 86 Turbo REAR ROTORS.....
Ahh...I see the light... This rotor will be dead-nutz centered from the 85.5 NA Rear Rotor 289 x 20mm with a 70mm OFFSET!
Ahh...I see the light... This rotor will be dead-nutz centered from the 85.5 NA Rear Rotor 289 x 20mm with a 70mm OFFSET!
xschop- Posts : 2711
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Re: RX7 Caliper Swap
xschop Mon Mar 29, 2010 3:24 pm
EDIT the 72mm total offset and 24mm thick rotor requires more tweeking. I radius a Semicircle in the design to get the RX7 mounting ears to clear the adapter bracket with hopefully no to very little trimming....we'll see....
Last edited by xschop on Tue Apr 06, 2010 9:44 am; edited 1 time in total
xschop- Posts : 2711
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Re: RX7 Caliper Swap
944v8inDFW Tue Mar 30, 2010 7:47 pm
Silly question why not put on 4 Lexus calipers all around?
944v8inDFW- Posts : 147
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Re: RX7 Caliper Swap
xschop Tue Mar 30, 2010 9:17 pm
BALANCE and stopping power.
The RX7 calipers on the rear are not only economical, but better than the Turbo fronts stuck on the rear.
The RX7 calipers on the rear are not only economical, but better than the Turbo fronts stuck on the rear.
xschop- Posts : 2711
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Location : OKC
Re: RX7 Caliper Swap
944v8inDFW Tue Mar 30, 2010 10:18 pm
Balance is what I was thinking about when I asked. I love a lot of brake on all 4 corners so I can dial in or out what I don’t want for whatever track. Another thing with me is same set of pads on front or back.
I definitely understand the conventional thinking that brake systems are always biased to the front. Just not my personal preference.
I definitely understand the conventional thinking that brake systems are always biased to the front. Just not my personal preference.
944v8inDFW- Posts : 147
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Re: RX7 Caliper Swap
Admin Wed Mar 31, 2010 7:28 am
Install a proportioning valve...........................
Admin- Admin
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Re: RX7 Caliper Swap
xschop Wed Mar 31, 2010 9:00 am
Tilton Blance bar count?
I got the Wilwood Prop valve on the shelf JIC. the Balance bar doesn't suit my taste. A few weeks back Greg suggested it was the exact same part as the Tilton. Got it from Southwest Speed.
My Metal supplier is out of the 1.5 x 1.5 4130 ATM. I am hoping he gets it before the weekend.
The Rx7 calps just about fit under the 15" Phonies with 86T rear rotors
I got the Wilwood Prop valve on the shelf JIC. the Balance bar doesn't suit my taste. A few weeks back Greg suggested it was the exact same part as the Tilton. Got it from Southwest Speed.
My Metal supplier is out of the 1.5 x 1.5 4130 ATM. I am hoping he gets it before the weekend.
The Rx7 calps just about fit under the 15" Phonies with 86T rear rotors
xschop- Posts : 2711
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Re: RX7 Caliper Swap
gt1scca Wed Mar 31, 2010 12:15 pm
The Manual shows 74mm, not 100mm. The rotor also was installed at the time measurements were taken, and was definitely not a new rotor for that matter.
2mm difference is possible, but I never said 100mm offset.
I'm sure of it. I'm not saying 72mm isn't correct either, but I know what I measured.
And I know what's printed.
2mm is about >>>ll<<< this much, BTW.
Maybe you added the rotor thickness to the offset?
2mm difference is possible, but I never said 100mm offset.
I'm sure of it. I'm not saying 72mm isn't correct either, but I know what I measured.
And I know what's printed.
2mm is about >>>ll<<< this much, BTW.
Maybe you added the rotor thickness to the offset?
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Re: RX7 Caliper Swap
xschop Wed Mar 31, 2010 1:51 pm
Hey Greg, I never said that I thought the 86T was 100mm, only the later 87-up rear offset (check previous post this thread). The problem is 74mm dim. given (and I don't doubt what you measured in your hands) and 2mm is a MAJOR problem when you have a 24mm dia. rotor sweep and 25.5mm RX7 caliper sweep (No room for error). It may be that these R1 concepts rotors are 72mm and factory Porsche 86T rotors are 74mm. The bracket dims I posted make up the difference and can be milled at the 944 control arm interface if need be or shimmed if this is the case. Your manual is spot on with everything I've seen in it and should be a required tool for every 944 hybrider....
xschop- Posts : 2711
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Location : OKC
Re: RX7 Caliper Swap
gt1scca Wed Mar 31, 2010 2:54 pm
OK,
I have seen 74mm listed other places, but specified for the '86T.
This may also explain the "washer-shimming" I've seen with the late rotors...
Red-headed stepchild '86T strikes again.
The R1, if it is a late rotor, probably should be 72mm.
I'm cool and collected, dude.
I have seen 74mm listed other places, but specified for the '86T.
This may also explain the "washer-shimming" I've seen with the late rotors...
Red-headed stepchild '86T strikes again.
The R1, if it is a late rotor, probably should be 72mm.
I'm cool and collected, dude.
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Prototypes done
xschop Tue Apr 06, 2010 9:38 am
I'm going to post a final drawing shortly. Will be updated with a smaller radius around the 944 arm mounts for very minimal RX7 Caliper ear trimming and tucked 1.5mm closer to the rotor for maximum 100% rotor/pad contact (the current drawing has only 1.5mm pad un-used..... Very little (@ 3/16" of the Caliper ear edge) needs to be trimmed to tuck the caliper tightly.....
A large Radius near the Control arm will also be incorporated, lightening the beefy adapter...
The dust shield ears can remain if you use cap head bolts, but piss on dust shields, I want all the air flow possible so chop, chop....see ya
0.6 mm will be removed from the 944 to adapter interface to position the 25.5 Rx7 sweep to 24mm 86T sweep perfectly.....
They ALMOST clear the 15" phonies, but no Cigar... If the bracket dims were modified to drop the Caliper about 4mm closer, they would be a hit.....
A large Radius near the Control arm will also be incorporated, lightening the beefy adapter...
The dust shield ears can remain if you use cap head bolts, but piss on dust shields, I want all the air flow possible so chop, chop....see ya
0.6 mm will be removed from the 944 to adapter interface to position the 25.5 Rx7 sweep to 24mm 86T sweep perfectly.....
They ALMOST clear the 15" phonies, but no Cigar... If the bracket dims were modified to drop the Caliper about 4mm closer, they would be a hit.....
Last edited by xschop on Mon Apr 12, 2010 10:33 am; edited 1 time in total
xschop- Posts : 2711
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xschop- Posts : 2711
Join date : 2009-06-09
Location : OKC
edit
xschop Tue Apr 06, 2010 2:11 pm
edit
Last edited by xschop on Tue Apr 06, 2010 2:23 pm; edited 1 time in total
xschop- Posts : 2711
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Re: RX7 Caliper Swap
subterfuge Tue Apr 06, 2010 2:14 pm
xschop- please excuse me if I'm a little slow on the information uptake, but to be clear... those are the front calipers from the 3rd gen RX7 (US 1992-95)?
They are being used in conjunction with 86 turbo FRONT rotors- is this able to be adapted to the late NA offset (I have a stock 88 NA)?
They are being used in conjunction with 86 turbo FRONT rotors- is this able to be adapted to the late NA offset (I have a stock 88 NA)?
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Re: RX7 Caliper Swap
xschop Tue Apr 06, 2010 2:20 pm
Yes, FRONT CALIPERS from a 3rd gen RX7 and 83-85.5 cars use 86 Turbo ***REAR*** rotors. Late cars will need 87-up Turbo REAR rotors
Since the bracket design is nice n beefy, I will be offering these in T-6061 Billet with the longer M12x 1.5 bolts. The stock 944 caliper M12 bolts are perfect for the RX7 Caliper to adapter
Just PM for cost so I can get a head count on the first run of material.
Since the bracket design is nice n beefy, I will be offering these in T-6061 Billet with the longer M12x 1.5 bolts. The stock 944 caliper M12 bolts are perfect for the RX7 Caliper to adapter
Just PM for cost so I can get a head count on the first run of material.
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