HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

Comments: 0

Latest topics
» WRL Race car for sale - '87 924S with LS swap
Fri Sep 22, 2017 8:29 am by cscowden

» New convert under way
Thu Sep 21, 2017 3:39 pm by kevin924kevin

»  A/C questions
Tue Sep 19, 2017 8:08 pm by Arthropraxis

» Corvette C6 Z06 Brake Caliper Adapters
Sat Sep 16, 2017 6:08 pm by superman22x

» Cayenne Front and Rear Brakes on 944
Sat Sep 16, 2017 6:00 pm by superman22x

» Parting out 944 Turbo with LS1
Sat Sep 16, 2017 8:14 am by rfreundt

» 944 LS1 race car part out
Sat Sep 16, 2017 8:00 am by rfreundt

» Steering shaft short
Fri Sep 15, 2017 11:11 pm by racertomtom

» Steering rack clearance
Fri Sep 15, 2017 5:32 pm by Hotrodz of Dallas

» What Intake Elbow to Use ?
Thu Sep 14, 2017 7:30 pm by remaxagent33

September 2017
MonTueWedThuFriSatSun
    123
45678910
11121314151617
18192021222324
252627282930 

Calendar Calendar

Log in

I forgot my password


Brake issues

Page 1 of 2 1, 2  Next

View previous topic View next topic Go down

Brake issues

Post  Lemming on Thu Oct 31, 2013 9:16 am

Up to last month, I had been satisfied with my the brakes on my race car. I'm running TurboS brakes in front, and turbo rears (hawk DTC 70f/60r). At Barber motorsports where I usually run, I even removed my brake cooling ducts as they were not needed.

Last month I go to NOLA and after 13 laps I completely lose my brakes. After bleeding they are fine. Temperature indicating paint showed the rotors (measured on the veins) to be >1400oF, and caliper temps over 600oF.

After that event, I replaced brake ducts and have added titanium backer plates.

Last week I head over to Road Atlanta. Brakes work well at the start of each session but begin getting spongy by the end. Rotor veins still reaching temps of >1400 degrees, calipers were less than 600 but I need to get a better system for measuring than the paint (will order Alcon temperature strips).

So, I'm trying to determine my problem. I was thinking that I might have a stuck caliper but after testing I don't think so. I'm going to replace the piston seals as they are likely original, so it won't hurt to do them.

I'll be at Barber the middle of November racing. If I have problems there, then I know there is a problem. If not, then I have an issue with brakes on hard braking tracks such as NOLA and RA. If so, I will need to think about the best upgrade.
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Arthropraxis on Thu Oct 31, 2013 10:57 am

You are using the DMC setup, aren't you? I don't know about what is normal for caliper/rotor temps but my DMC needed some heat shielding. The pedal would be spongy when I got back into the car when it sat for an hour or so after a drive. Your car may get some heat soak into the MC's while running with the extreme temps at the track.
avatar
Arthropraxis

Posts : 1073
Join date : 2009-09-02

Back to top Go down

Re: Brake issues

Post  Rich L. on Thu Oct 31, 2013 11:45 am

Well that sucks. Nothing spoils driver confidence like brake problems. I'll throw some other ideas out there but can't say I've had this problem. Are the rotors getting slim? Less meat gives less heat capacity. I assume you haven't changed fluid and are using a good one. You were changing hubs around a while back, might the bearings be too tight? I think you used an aftermarket bearing, maybe they're not quite right and putting heat into the hub & rotor.

Rich
avatar
Rich L.

Posts : 811
Join date : 2011-05-30
Location : Seattle

Back to top Go down

Re: Brake issues

Post  xschop on Thu Oct 31, 2013 2:07 pm

Heat shield the MC's, get some Wilwood Integras on a 13" rotor and never look back...





avatar
xschop

Posts : 2711
Join date : 2009-06-09
Location : OKC

Back to top Go down

Re: Brake issues

Post  Lemming on Thu Oct 31, 2013 4:56 pm

All good suggestions. I do have a heat shield around the DMC already, but could put a small air duct to it fairly easily. I don't think it's the bearings as the rotor hat is not getting hot, in fact there is no change in paint color (temp indicating paint) of the hat. And yes Rob, I was looking at your thread on those and was going to contact you about the adapters. Will those fit in a 17" wheel?
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  xschop on Fri Nov 01, 2013 7:11 am

Tim I am suggesting these as I was brought a pair last year to mock-up on a local 951 track car. I had done a few different adapters for various calipers over the years for this particular car and he said these are the track kings.
And yes they fit under 17"s with a 330mm rotor. I have a set that I will mount on my 928 when I get a bigger set of wheels. Right now I have 993 16" and these calipers barely fit with the 318mm BoxsterS rotors and 1/2" wheels spacers.
avatar
xschop

Posts : 2711
Join date : 2009-06-09
Location : OKC

Back to top Go down

Re: Brake issues

Post  Rich L. on Fri Nov 01, 2013 9:39 am

Those are massive! How's the pad selection? That's the nice thing about Big Reds is that pretty much ever pad is made for them.

Rich
avatar
Rich L.

Posts : 811
Join date : 2011-05-30
Location : Seattle

Back to top Go down

Re: Brake issues

Post  xschop on Fri Nov 01, 2013 10:14 am

These replaced a set of Big Reds. He said his overheating issues are a thing of the past. The Therm-lock pistons are key along with the 1.1" thick pads lol.

I made a simple adapter with barrels to fit the 180mm radial span on them for the 951 spindle, but wondered if the factory wilwood adapter could be modded to fit the 87 NA spindle.
avatar
xschop

Posts : 2711
Join date : 2009-06-09
Location : OKC

Back to top Go down

Re: Brake issues

Post  Lemming on Fri Nov 01, 2013 10:50 am

Yea, those pads are as thick as what you find on good Alcons. I looked at pads, and the Polymatrix is available as well as PFC. There's a cross reference for hawks, but when I search the numbers, nothing comes up.
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  xschop on Fri Nov 01, 2013 11:09 am

IIRC I have a set of the hawk pads for them, just don't recall if it's the deeper sweep pads that I have are brand new. I will build adapters for them to fit 87-up NA spindles and Cayenne 13" rotors. His adapter was one-off as he had a Wilwood 13" 2-piece rotor with shorter off-set.
avatar
xschop

Posts : 2711
Join date : 2009-06-09
Location : OKC

Back to top Go down

Re: Brake issues

Post  Lemming on Fri Nov 01, 2013 12:12 pm

Oh $#**, just bought a set of used integras off of evilbay Shocked

Found a good deal on a set of polymatrix A pads on evilbay as well.  Hawk pad sizing is http://www.raceshopper.com/brake_pads/hawk/hb221u1.10.shtml

Will be selling turbo S calipers, adapters, nearly new rotors, and titanium backing plates if this works well.
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  xschop on Sat Nov 02, 2013 1:53 pm

Hey Tim. I'm at shop today and need you to confirm a dimension on your Turbo spindle and hub when bolted up. I assume you have a spare set of 87-up 951 spindles?
avatar
xschop

Posts : 2711
Join date : 2009-06-09
Location : OKC

Back to top Go down

Re: Brake issues

Post  Lemming on Sat Nov 02, 2013 4:47 pm

PM with phone number sent.
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  docwyte on Sat Nov 02, 2013 7:16 pm

Never had an issue with my Big Reds and 964 turbo rotors. Ran the entire season on the same fluid even...

docwyte

Posts : 1371
Join date : 2010-07-18

Back to top Go down

Re: Brake issues

Post  xschop on Sun Nov 03, 2013 8:26 am

Tim pm your # again my inbox got dumped.
I need the distance from hub face to caliper/spindle interface. On the NA hub/spindle it is 3.450"
The deep Integra pads match the Cayenne rotors perfectly at 62mm depth. So I won't even bother with a 2 piece rotor on mine.
avatar
xschop

Posts : 2711
Join date : 2009-06-09
Location : OKC

Back to top Go down

Re: Brake issues

Post  Lemming on Sun Nov 03, 2013 9:11 am

2.960"

Pic below to see if this is what you need.

avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Arthropraxis on Sun Nov 03, 2013 10:42 am

Mind posting a pic of the MC heat shield? Thanks. I wrapped mine in heat reflecting fabric but it still gets some heat soak when it sits after driving, but much better than it was.
avatar
Arthropraxis

Posts : 1073
Join date : 2009-09-02

Back to top Go down

Re: Brake issues

Post  Lemming on Sun Nov 03, 2013 12:10 pm

Arthropraxis wrote:Mind posting a pic of the MC heat shield? Thanks. I wrapped mine in heat reflecting fabric but it still gets some heat soak when it sits after driving, but much better than it was.
Alum heat shield between headers and bottom of the MC's.
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Arthropraxis on Sun Nov 03, 2013 5:21 pm

Thanks. Mine are over and under so the bottom one is closer to the headers.
avatar
Arthropraxis

Posts : 1073
Join date : 2009-09-02

Back to top Go down

Re: Brake issues

Post  Lemming on Mon Nov 04, 2013 11:17 am

Everything is ordered. Will not attempt to make the conversion for my race at Barber in less than 2 weeks, but instead will shoot for installing and dialing it in at the PCA DE at Barber in December. I'll report back then.

I will be using Stoptech powerslot rotors and Polymatrix A pads to start with.
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Lemming on Tue Nov 05, 2013 9:19 pm

The pads came in today, damn things are massive Shocked

avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Lemming on Wed Nov 06, 2013 7:58 am

Rich L. wrote:Those are massive! How's the pad selection? That's the nice thing about Big Reds is that pretty much ever pad is made for them.

Rich
Pad interchange: Wilwood 9828; PFC 7775, Hawk 221, Raybestos R561.28

You can buy the PFC's on ebay all day long for $150/axle set Very Happy 
avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Rich L. on Wed Nov 06, 2013 12:15 pm

Lemming wrote:The pads came in today, damn things are massive Shocked
DA'YAM! cheers 

I have that exact same ruler. Wink 

Rich
avatar
Rich L.

Posts : 811
Join date : 2011-05-30
Location : Seattle

Back to top Go down

Re: Brake issues

Post  Lemming on Wed Nov 06, 2013 3:24 pm

Calipers arrived today and I'm shocked. Based on the photo on page 1, as well as the size of the pad, I was expecting humongous calipers. Turns out that they are roughly the size of the turbo s, not quit as thick but slightly wider to accommodate the thick pads. Calipers are on the truck for delivery.

avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Re: Brake issues

Post  Lemming on Wed Nov 06, 2013 5:18 pm

Turbo S vs Cayenne (Stoptech power slot) rotors

avatar
Lemming

Posts : 855
Join date : 2011-05-30
Location : B'ham

Back to top Go down

Page 1 of 2 1, 2  Next

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum