850 Sport Coupe series 2 track car.

Discussion in 'Rear-Engine Fiats' started by ramona300, Oct 1, 2015.

  1. ramona300

    ramona300 True Classic

    I have just realized I have not posted my last video from The Fiat Nationals at Tailem Bend. This was on April the 12th and the video was from the second session of the sprints. On the warm up lap I stick the outside wheels in the dirt and end up in the infield. I suspect I damage the electrical water pump or there is an airlock and when I return to the track the warning light for the Davies Craig controller lights up. I don't notice it or the gauge and it's not until I get a smell of coolant I realize I have a problem. I ended up with a blown headgasket. No other damage. Spesso headgasket is on it's way.
     
    MikeHynes, khnitz and NM850 like this.
  2. kmead

    kmead Old enough to know better

    Location:
    Michigan
    Is it that little LED jus to the right of the three instruments on the left side of the car? It wasn’t on when you started driving, was off when you restarted the car and only came on just after you reentered the track from your excursion.

    Bummer, it looked great up until then. A rear engined car can be a handful without doubt when they get out of shape.
     
  3. ramona300

    ramona300 True Classic

    The handling was excellent and I kept several X1/9's behind me. It was just stupidity! I was not paying attention, worrying about how I was going to get past the white Punto who was slowing me down. The LED is the trouble light for the Davis Craig controller, That square thing with the LCD screen that shows the water temperature. As I pull back on to the track the temperature on it races straight to the top and the light comes on. I will be shifting that LED to a position right in front of me. Not sure what the problem really was. The water pump works fine. I have since removed the inline thermostat and installed a filter up on the top radiator hose. I suspect it might have been some air in the system. The video of my first session shows the cooling system on the LCD screen was working perfectly. It's possible the pump which is mounted very low hit the dirt during my excursion. I can't think of anything else.
     
  4. GregS

    GregS ProjectX

    Location:
    Australia
    It's great that it's just the gasket. The video has both my Xs in it, orange one while you were spinning (my son driving) and blue one you're passing while I was trying to work out how to avoid the oil spill. I also just saw your previous video, what track is that? It looks interesting, but I don't like all those walls so close.
     
  5. ramona300

    ramona300 True Classic

    Marulan, or as it's now called Pleasant Wood. Only about 1 1/2 hours away. Just resurfaced and is a great little circuit. Only one concrete wall that is a worry. If your there weekdays tuning etc and it's quiet the kangaroos are more of a worry than the concrete walls!
    http://www.mdtc.com.au/race-circuit/
    That other video is pre front anti rollbar. Since I fitted the thick antiroll bar I dropped 4 seconds a lap at Marulan!
     
    Last edited: May 10, 2019
    khnitz likes this.
  6. Pantdino

    Pantdino Low Mileage

    Location:
    Cerritos, CA
    Sorry if you answer this in the thread, but what are you using for a transaxle? The problem with the 600 based cars is that the axle ratio only allows 15 mph per 1000 rpm, so top speed is limited by how brave you are with your engine holding together. Is there a transaxle with a numerically lower ratio you use?

    Thanks

    Jim
     
  7. ramona300

    ramona300 True Classic

    Still using the stock Coupe arrangement. Looked for an early sedan gearbox, ones with 12 inch wheels to get a better final drive but keep finding the later ones with 13 inch wheels. Planning for something better with my next engine I'm putting together at the moment.
     
  8. ramona300

    ramona300 True Classic

    Playing around with Filmora 9 video editing programme and stitched this short video together. It's a couple of weeks ahead of the previous video and I'm testing the new thick front antisway bar. Start of the first session with cold tyres and a few crook gear changes and weird lines!
     
    NM850 likes this.
  9. GregS

    GregS ProjectX

    Location:
    Australia
    Nice quiet day on track. Is that video editing easy to use? I struggle with the one I have been using. Here's a short one from The Bend on 16th June, somehow knocked 3 1/2 seconds off my best time from the Fiat nationals.
     
  10. ramona300

    ramona300 True Classic

    That is a really nice circuit! That MX5 makes it look easy. I had a track MX5 that I wish now that I kept. Should have kept it and swapped in a Fiat engine! They are so easy to drive. Filmora 9 is real easy to use, probably the easiest video editing programme out there but unless you have a paid version you get a watermark. Of the free versions I have found VSDC to be OK but not as simple as Filmora.
     
  11. GregS

    GregS ProjectX

    Location:
    Australia
    Thanks, I will check out the editing stuff. That mx5 has a turbo, faster than my 1500 in a straight line, but catch up under brakes, good fun.
     
  12. ramona300

    ramona300 True Classic

    Hillclimb on Sunday 7/7/19. Changed the muffler to a smaller lighter unit. Did my personal best in the Fiat on the final run. I think the reduction in weight hanging out the back helped but most of the improvement was down to changes with the ignition mapping. I have way too much ignition retard and this will have to be resolved. Professional tuner has set the total timing to 17 degrees which is way too safe. Stock engine is 37 degrees and with 10psi of boost the timing should be all in at 27 by my calculations. Huntley Jul 19b  (2).jpg
     
  13. ramona300

    ramona300 True Classic

    This is a video from the 7th of July. Only recorded the first run because I had a full memory card! Video shows a bit about what goes on at the local hillclimb. Apologies for the poor quality thanks to Youtube degradation. Last run of the day was my personal best with this car.

     
    Frank L. Di Gioia, kmead and NM850 like this.
  14. kmead

    kmead Old enough to know better

    Location:
    Michigan
    When I lived in Vermont the sports car club I was part of would run a hillclimb up a couple of mountain roads, @2miles, Asctuney and Burke mountains. Ascutney was faster, Burke was extremely memorable.

     
    Frank L. Di Gioia and NM850 like this.
  15. ramona300

    ramona300 True Classic

    Picked up this early 850 engine for my next engine project. I only want the block. This block is 5mm shorter than a 903 and will be a better fit for the new internals. 903 crank is away at the moment getting a slight stroke increase and machine to match the Suzuki conrods. Not sure what the arrangement is with the cover in the center that has oil passages to the centre bearing by the look of things. No mention of it in the workshop manuals. I would like to convert to a spin off oil filter so I'm hoping this might be a good start!
     

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