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Adding ABS

RoadRacer4Life

Owner: DeathWagon
300+ Club
Joined
Jul 3, 2005
Location
Montgomery Alabama
So as most of you guys know I've been working and driving Randy Pobst's Flyin Moose Volvo 740. I have been working to improve the car bit by bit and re-installing the ABS system in now on my list. His previous mechanic ripped all the old ABS stuff off of the car and well I want it back.

Is the ABS system on a 740 and 240 the same?
Same computer and number of channels? Same or similar sensors?

I picked up a complete ABS system from another t-bricks member with all of the wiring, computer and pump included. The 240 ABS system wiring is completely isolated from the rest of the wiring harness so I am hoping to just graft this system onto the 740.

Any thoughts or concerns from you guys? Useful info that might help me out?

Thanks guys

-Sam


173139940.973577c1.JPEG
 

JohnMc

PV Abuser
300+ Club
Joined
May 10, 2004
Location
St. Louis
Not that this is a definitive authority, but here's an eBay auction for an ABS ECU that agrees with my strong hunch that they're all the same: https://www.ebay.com/itm/2234998088...hOIuJrHFPA6YDNhWnPBomYrwIXPb5fu9ZxE-BBdKpDogI

COMPATIBILITY
For Reference only:
1991-1993 VOLVO 240 SERIES ABS; (under pass seat)
1989-1992 VOLVO 740 ABS; (LH dash)
1989-1990 VOLVO 760 ABS; (LH dash)
1990-1991 VOLVO 780 ABS; (LH kick pnl)
1991-1993 VOLVO 940 ABS; (LH dash)
1992-1993 VOLVO 960 ABS; (LH dash)
 

mikep

The MP
Joined
May 24, 2003
Location
38? 27' N 75? 29' W
I saved the entire working abs system from a 93 945. Front lines included. I doubt I will use it.
What year is the moose? Does it still have the front tone rings? I have those, but if you need the hubs you will have to find those. I re-drilled these for ford pattern.
 

lookforjoe

Making Volvo Parts Fit
300+ Club
Joined
May 27, 2008
Location
Rockland County, NY
I would check the 240 / 740 parts catalog for the year of the parts you acquired, and for the year of the car in question.

Since both cars utilize 2 front & one rear sensor, chances are the electronics are much the same. I have the Volvo Greenbook for late 80's ABS, I can look later to see if there are any chassis-specific notes.
 

Fa182

Stage 1
Joined
Apr 4, 2016
Location
Austria
I just looked the part numbers up on GCP for the hydraulic and control unit, both late 2 and 7 cars used the same one, part 6819092 and 3523142.
Looks like you'll be fine on that part.
 

JohnMc

PV Abuser
300+ Club
Joined
May 10, 2004
Location
St. Louis
I did verify via www.gcp.se that the 740 and the 240 have the same part number for the ABS ECU (3523142-2), as well as the hydraulic valve unit (6819092-5).

You're probably down to the brackets being different that hold the components in the dash/under the seat and engine bay. And different hoses.

But the main important parts are the exact same.
 

2manyturbos

Moderator
Joined
Mar 8, 2003
Location
Monroe, OR USA
The 240/7/9 Volvo ABS is rather crude when really pushed. If you go this route, be careful when you are first using the car hard again. Greg Ervin's 740 would have no brakes whatsoever at times and it took hearing a story about a Porsche momentarily having almost no brakes from a Autocross National Champion/EVO/Hooked On Driving instructor before we figured out what was going on. The 740 would go into ice mode and you could literally stand on the brakes with almost no deceleration happening. The 740 was set up much the same as the car you are driving, coil overs front and rear with very stiff springs. Radically different wheel speeds causes the system to go into ice mode. It is quite easy to find yourself in ice mode Autocrossing, road racing, etc. All you can do is get off the brakes to let the wheel speeds equalize and then get back on the brakes if you haven't already rear ended someone or hit the wall.
 

RoadRacer4Life

Owner: DeathWagon
300+ Club
Joined
Jul 3, 2005
Location
Montgomery Alabama
The 240/7/9 Volvo ABS is rather crude when really pushed. If you go this route, be careful when you are first using the car hard again. Greg Ervin's 740 would have no brakes whatsoever at times and it took hearing a story about a Porsche momentarily having almost no brakes from a Autocross National Champion/EVO/Hooked On Driving instructor before we figured out what was going on. The 740 would go into ice mode and you could literally stand on the brakes with almost no deceleration happening. The 740 was set up much the same as the car you are driving, coil overs front and rear with very stiff springs. Radically different wheel speeds causes the system to go into ice mode. It is quite easy to find yourself in ice mode Autocrossing, road racing, etc. All you can do is get off the brakes to let the wheel speeds equalize and then get back on the brakes if you haven't already rear ended someone or hit the wall.

I run the same setup on my race 245 and have been pretty happy with it. Agreed its crude but the brakes on Randy's car have been subpar for a while now and we have had issues with flatspots due to lockups. Trying to avoid unnecessary tire changes.
 

2manyturbos

Moderator
Joined
Mar 8, 2003
Location
Monroe, OR USA
As crude as the system is it out braked us every time. When we were trying to figure out what was going on we pulled the fuse to see if it would put an end to the no brakes situation. It did. Our runs were always slightly slower because we had to brake earlier. We assumed something was wrong with the pump or computer controlling the ABS. It wasn't until that conversation with Tom Kotzian that we realized it was doing exactly what it was designed to do. We ran the ABS from then on and were ready for a no brakes situation. The problem didn't arise until the spring and damper rate went way up to road race stiffness/frequencies. That resulted in the 740 lifting inside tires on really hard cornering. My post was just a heads up in case you never experienced ice mode. As long as Randy has been racing I'm betting he has more than once. The first time leads to panic mode because it feels like a mechanical failure.
 

rb92673

racecar
Joined
Jan 17, 2017
Location
San Clemente
I run the same setup on my race 245 and have been pretty happy with it. Agreed its crude but the brakes on Randy's car have been subpar for a while now and we have had issues with flatspots due to lockups. Trying to avoid unnecessary tire changes.

Meh. I have a decent tire that has a huge flat spot from our last race. I feel your pain.
 

Harlard

Hurlurd?Harland?Bueller?
300+ Club
Joined
May 11, 2007
Location
PDX
Look at the MK60 ABS thread. Looks like nearly all the facelift E46 ABS systems work standalone and can be tuned.
 

WillettRun?

†John3:16
300+ Club
Joined
Jan 24, 2009
Location
Fate, Tx
MK60 ABS can be run standalone, and it has wheelspeed outputs (or CAN if you have an actually decent standalone)
 

OVERDRIVE

Member
Joined
Jul 31, 2017
Location
Brooklyn, Neu York
MK60 ABS can be run standalone, and it has wheelspeed outputs (or CAN if you have an actually decent standalone)

I've been told by a BMW specialty race shop that the MK60 is essentially straight out of the Bosch motorsports catalog and can be run standalone. The recent MK60 thread recently is a good read. The rear axle will need speed sensors on each wheel.
 

Slickbrick780

New member
Joined
Sep 19, 2022
780 abs

Happened to stumbled across this thread.

We race an 1989 780 and were having all sorts of braking issues locking up, flat spots on tires brakes fade etc etc..! Although we never experienced it ours did have an abs system at one point but parts of it are missing.

We are in the middle of upgrading to s60r brakes all round and I was about to rip out what?s left of the ABS. But now maybe I?m thinking I should reconsider! We were goin to go with a willwood portioning valve with the new calipers, rotors, MC & booster and call it good.

Is the ABS system really worth reviving? Are there big advantages to have it for racing?

What parts make up the system exactly. We still have the abs module & MC but that?s about it.. all wiring, sensors and ECU are gone ..

We are running a b230ft 16v with a stand-alone microsquirt.


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