Brake specs of EA81T

General Subaru Talk - Media / News / Stories ...
Post Reply
User avatar
steptoe
Master Member
Posts: 11582
Joined: Thu Oct 06, 2005 10:00 am
Location: 14 miles outside Gotham City

Brake specs of EA81T

Post by steptoe » Sat Aug 08, 2009 10:20 am

I am wondering if the factory fitted EA81T vehicles had any different brakes to the standard MY EA81 equipped vehicles. We all know the L Series EA82T got disc brake rear. Was it only US Brat or Japanese Brumbies that got the EA81T?

Anyone got contact with other forums member in US that has factory EA81T that they could ask?

User avatar
Gannon
Senior Member
Posts: 4580
Joined: Sat Nov 05, 2005 10:00 am
Location: Bowraville, Mid Nth Coast, NSW

Post by Gannon » Sat Aug 08, 2009 12:24 pm

I cant remember hearing of different brakes for the EA81T models.

I do know that they would have had the vented rotors that the 84 models got, but thats only natural because EA81T's were only made in 84
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------

User avatar
steptoe
Master Member
Posts: 11582
Joined: Thu Oct 06, 2005 10:00 am
Location: 14 miles outside Gotham City

Post by steptoe » Sat Aug 08, 2009 4:00 pm

only made in '84 ?! Something I did not know. Musta been a bit of tinkering around getting ready for the '85 EA82T L Series. What a lot of mucking around for one years run !

User avatar
dfoyl
Junior Member
Posts: 717
Joined: Mon Aug 28, 2006 12:13 pm
Location: Victoria eastern suburbs

Post by dfoyl » Sat Aug 08, 2009 10:07 pm

Turbo was an option in 1983 for the US market.

AFAIK, all Brat's received disc/drum - Turbo or otherwise.

Dean.
1989 Brumby - Shiny new red paint, stroked EJ20 phase 2 SOHC with Darton sleeves bored to EJ22, Wiseco high-compression pistons, Delta 2000 grind cams , EJ/XT6 5 stud with WRX 4/2 pots, 5-speed, 86 GTS seats and so much more.
Contact me for reproduction XT6 hubs...and EA82 rear discs.

User avatar
TOONGA
Elder Member
Posts: 5339
Joined: Sat May 30, 2009 10:15 am
Location: Mandurah where they divided by zero
Contact:

Post by TOONGA » Sun Aug 09, 2009 10:12 am

from what I've seen while looking for rotors and hubs on the net the US brats got rear discs as the turbo variant and they are the same as the rear discs on the vortex and the L series turbos


look here

http://www.statracing.com/replacement/s ... kedisc.asp

TOONGA
Image
PJ Gone but not forgotten
JETCAR AKA the sandwedge Rusted in pieces

User avatar
mcbrat
Junior Member
Posts: 11
Joined: Wed Aug 05, 2009 11:59 am
Location: Iowa, USA

Post by mcbrat » Tue Aug 11, 2009 3:39 am

In the US, the EA81T vehicles were vented disc front, drum rear. same as the other MY 84 vehicles.

The automags back in the day wrote articles on the EA81T (Turbo Traction wagon and Brat) as a 1983 1/2 offering, as they weren't available at the start of the 83 model year.... the Turbo Traction Coupe was only available in '84 as far as I can tell.

User avatar
steptoe
Master Member
Posts: 11582
Joined: Thu Oct 06, 2005 10:00 am
Location: 14 miles outside Gotham City

Post by steptoe » Tue Aug 11, 2009 10:22 am

Ah McBrat saves the day on this one. Thanks heaps. Now, any chance of specs of drums and discs if any different to that of the other Brats and MY of 83, 84 ?

I just want some info to back up a request to an engineer to approve my turbo conversion to my 84 Brumby. It looks as if fitting the later L Series brakes up front on the MY is not going to be possible as first planned and a written requirement for registration approval is to carry over brakes from engine donor vehicle.

User avatar
mcbrat
Junior Member
Posts: 11
Joined: Wed Aug 05, 2009 11:59 am
Location: Iowa, USA

Post by mcbrat » Tue Aug 11, 2009 2:09 pm

in the US in 83, the Wagons were the first to get the vented rotors. The Brats had solids. the rear drums for all models were the same... 83 and 84.

When the say "carry over the brakes from donor", do they give a definition of "brakes". the L series calipers are a tad bigger (thus the change to the wagon wheels). the front wheel bearings are the same. QMan on the USMB had some MY brake parts on the front of a L coupe one time... I don't remember which parts, but for sure one piece was the hub (that bolts to the rotor)... as he had to grind something that was a tad different.... definitely worth looking into.... I saw your other thread, and looks like the L "knuckles" won't work because of the strut and ball joint angles...

I wonder if you could use the MT vented calipers with the L hub/rotor assembly? In the US, the outer spline count in the hub was the same across all ea81/ea81T/ea82/ea82T (25 spline I think). it was the inners that were different. (turbo 23 spline, NA 25 spline) or might have the numbers mixed around, but the outers were the same for sure....

User avatar
steptoe
Master Member
Posts: 11582
Joined: Thu Oct 06, 2005 10:00 am
Location: 14 miles outside Gotham City

Post by steptoe » Tue Aug 11, 2009 3:31 pm

thanks.

the definition is as simple as must use the brakes and suspension from the vehicle the engine comes from as well its engine management and emissions, but an engineer has final say by the sounds of things. It was once stated if a vehice was to be turboed it must have disc brake rears, this rule seems to have gone, and the tech standards gents of the RTA have said it is up to the engineer.

My Gregories manual does not state two disc options of MY , just nominal thick 12.5mm, minimum thick 10.0 mm

rear drums for all MY and L 180mm nominal , 182.0mm max

85 - 87 sedans and wagons got 18mm, min thick 16.0mm disc. No diameter specs?
All models got 20.64mm or 13/16" bores in the master cylinder.

After reading of Phizinzas understanding of L hubs V's MY I will give things another look in another light - maybe performance slotted rotors and better pads and overhaul my grouchy MY calipers

User avatar
steptoe
Master Member
Posts: 11582
Joined: Thu Oct 06, 2005 10:00 am
Location: 14 miles outside Gotham City

Post by steptoe » Tue Aug 11, 2009 10:06 pm

OK

I've measured the diameter of an old MY vented disc at ~230mm, an old L Series front measures in at ~240mm. You'd think that was such a small difference to not worry an engineer especially as though the project car is at least~100kg lighter than the donor model a sedan at 1060kg or heavier wagon.

Post Reply

Return to “Subaru Chat”