850 Stabilizer bars.

Discussion in 'Rear-Engine Fiats' started by ramona300, Oct 26, 2018.

  1. ramona300

    ramona300 Daily Driver

    Stabilizer/rollbar /sway bar depending where you live. Does anyone know the dimensions of the front and rear bars like Scuderia Topolino used to sell? I am after the diameter and whether they are hollow or not. Or any suggestions. Currently I have a wishbone front with Bilstein coil overs and no sway bar. Rear is gas shocks and Abarth 1300 coils and the stock sway bar.
     
  2. myredracer

    myredracer Daily Driver

    I have a new Addco sway bar for installing on the front on an 850 coupe. The stock front bar gets moved to the rear and the Addco gets installed on the front (or is the other way around?). It's 3/4" dia. and solid. I got it along with a urethane bushing kit for the bar and links on ebay years ago. It's going to go on my 1300/124.
     
  3. Frank L. Di Gioia

    Frank L. Di Gioia Daily Driver

    Location:
    las vegas, nevada
    I sent Addco an Email a few weeks ago asking if the thicker 850 bar was available and I'm still waiting for a reply. I'll try a phone call next. On my '67 Spider I ran the Addco bar at the rear and moved the rear bar to the front. With Carrera shocks, 1300/124 reverse eye and coil springs and P-7 Pirelli's it was a very good auto-X car. The 8-port PBS motor helped.
     
  4. ramona300

    ramona300 Daily Driver

    Thanks for the replies. I think I will put the original front one back on and try that first. John Edwards in his book talks about a 124 bar on the front of his sedan. When he changed to coil over fronts he removed both bars!
     
  5. kmead

    kmead True Classic

    Location:
    Michigan
    By going to higher rate (higher pound load) springs, front and rear, one can tune out the need for bars.

    Steve Hoelscher has written a number of guides around this both for the X1/9 and the MR2, both of which he has won many Autocross championships with.

    This tends to be more appropriate for track cars versus road cars. In your case likely perfect. You might consider contacting him, he is both knowledgeable and kindly willing to share what he has learned.
     
  6. NM850

    NM850 True Classic

    Location:
    Albuquerque NM
    Interesting. I’ve never heard that theory but then I don’t know Autocross. All the track cars I’ve seen use sway bars. Even F1 is still using some form of sway bar to the the two sides together.
    I’ll have to find some Hoelscher articles to educate myself.
     
  7. ramona300

    ramona300 Daily Driver

    I have the right springs for and aft I'm fairly confidant of that. The car feels unsettled at speed in some corners on the circuit. Looking at my collection of photos of 850 race cars they all have front roll bars and fairly thick ones. I'm thinking myredracecar might be on the money with his 3/4 inch solid bar. Hillclimb this Sunday so I think I will install the stock item for that and try something in the 20mm range after that. The car does not roll much it just feels not quite right!
     

    Attached Files:

  8. NM850

    NM850 True Classic

    Location:
    Albuquerque NM
    Could be an alignment issue. Have you check the alignment of the rear wheels?
     
  9. kmead

    kmead True Classic

    Location:
    Michigan
    They do look toed in at least in that one pic.
     
  10. ramona300

    ramona300 Daily Driver

    Rear has 1.3 degrees toe in. Front 1.1 toe out.
     
  11. myredracer

    myredracer Daily Driver

    I have to ask - what size tires do you have on your coupe and what width rims? They look great!
     
  12. ramona300

    ramona300 Daily Driver

  13. Jeff Stich

    Jeff Stich True Classic

    Location:
    Norco, CA
    It's the other way around. In your case, the stock 14mm front bar gets discarded, the stock 16mm rear bar gets moved to the front, & your Addco 3/4" bar gets installed on the rear.
     
  14. NM850

    NM850 True Classic

    Location:
    Albuquerque NM
    That seems like a lot of toe in the rear. Not sure how that changes with suspension travel.
    In the front I would try zero toe. Toe out helps with turn in but can make the car twitchy. Ive never raced an 850 but I would think being so light at the front and short wheelbase you wouldn’t need turn in help.
     
  15. ramona300

    ramona300 Daily Driver

    The rear toe in figures is what John Edwards recommends in his book for Autocross. For road racing he has 0 to 1/8th toe in. The settings I use are the same as a friends X19 track car but I might as well try with reduced toe in in the rear.
     
  16. ramona300

    ramona300 Daily Driver

    Thanks for that Jeff. I will be running the front 14mm and the stock rear 16mm this weekend then sorting out new bars later.
     
  17. ramona300

    ramona300 Daily Driver

    Thanks for that. Reading this page on toe settings I'm tending to think you are right.
    https://motoiq.com/the-ultimate-guide-to-suspension-and-handling-part-seven-tuning-your-toe/
     
  18. Jeff Stich

    Jeff Stich True Classic

    Location:
    Norco, CA
    The old FAZA 850 Competition Manual says:

    Front: -1°camber with 1mm toe in.
    Rear: -3°camber with 2mm toe in.

    faza850racesuspension.JPG
     
    Last edited: Nov 2, 2018
  19. NM850

    NM850 True Classic

    Location:
    Albuquerque NM
    Good place to start but I’m guessing modern track tires make it a whole new puzzle.
    At least that’s how it was when I tried to use specs from the late 70s on my race car.
     
  20. ramona300

    ramona300 Daily Driver

    Front roll bar is on. Tomorrow I will give the front a touch of toe in. The rear looks like it has a lot of toe in in the photo but holding a long bar on the tyre at the centreline while the car sits on the trailer it looks like very little. Was set at 3mm.
     

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