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Old 21-02-2017   #46
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Was at another hillclimb event last Sunday. Still not got the Microsquirt dialed in correctly and had a failure on the first run. Car running way too rich.

Next event is the Australian Fiat Nationals in a couple of weeks. I made some adjustments to my front brakes to get more swept area. The Tokico mounts were shortened down to move the caliper closer in. First photo is the before photo.

This photo shows the extra area with all the pad making contact.
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Old 31-08-2017   #47
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Have not posted for awhile so I thought a couple of videos might be helpful.

This is a recent one where I was doing some tuning!

Since then I have had a minor engine problem and I will get to that shortly!
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Old 23-02-2018   #48
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Been awhile! Last month had the car on a dyno. Was surprised to find I was running 19psi boost at 6000rpm. This was giving me heaps of torque, roughly double the stock torque and HP at the rear wheels was up 50%. Unfortunately the air intake temperature was 150c and hp dropped off rapidly after 6000rpm.
Fortnight ago ran in the local hillclimb. 5 trouble free runs and the car sounded great. Last couple of days I have installed a larger pulley on the supercharger and now run a ratio of 1.46:1. From the data logs I have about 9psi and the air intake temperature is down to 80c. Back to the dyno next week to sort the ignition and fuel maps. The engine sounds much happier and I suspect I will have more hp and a little less torque but the car will be easier to drive. Video is with 19psi boost. Cone aircleaners are crap!
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Old 02-03-2018   #49
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Dyno day again yesterday to check the maps at the new boost of 8psi.
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Old 22-03-2018   #50
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Short video from the first run at Winton. My first time at Winton and the cars first run on a full sized circuit. I never got to grips with some of the corners, especially those just after the sweeper! Many laps are required at this circuit to get it sorted. Took it fairly easy and never used more than 6500 rpm and about 70% throttle. Second run after a couple of laps I left the track at corner 10 over the ripple strip. This strip has a sharp deep drop off on the inner edge and I hit the floor pan very hard. Lap or so later I had the occasional backfire from the exhaust and a series of brief engine failures. Car started immediately after each stop and I'm certain it was ignition. Third run I had more engine failures and I decided to put her back on the trailer.
When I got home I plugged in the laptop and run the engine and data logged but found no faults. I did notice the WUE light took awhile to go off and when I checked the settings found the warm up enrichment was still on at 86 degrees C. I reduced that to about 70. When I watched my videos of the day I was surprised to see the radiator temperatures on the Davis Craig controller were 75c, the temperature is set to 85c and the controller maintains the temperature normally by cycling the pump or turning on the fan. No idea what temperature the Microsquirt was seeing but it's possible the WUE was coming on and adding fuel. I will be installing an inline thermostat. Mini Cooper S radiator is too efficient.
Also snapped off a welded lug on the left rear suspension where I have a Dyneema strop to stop the suspension tucking under. The left driveshaft boot has also let out a heap of transmission fluid. There is gear box oil everywhere on the left hand side of the engine bay and a fair bit on the 36:1 timing wheel and Ford pick up. There is about a 1 mm air gap there normally but I'm starting to think some of the oil may have upset the signal and caused the intermittent failures.
Car has done 145 miles now on the rebuilt engine and about 20 miles since the replacement pistons and new rings.
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Old 25-03-2018   #51
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Yesterday I ran the engine till it was nice and warm then dribbled some oil over the induction pick up to simulate the gearbox oil leak problem. Blipping the engine resulted in several backfires and the engine ran rough but did not stop. Under load the engine probably would have stopped though I reckon. I'm fairly confident this was the problem at the sprints. The induction pick up slopes down to the 36-1 wheel and the oil runs down to the tip perfectly! An electrical tie about 5mm from the tip with the joiner down would probably cause the oil drops to fall clear. I will probably devise some sort of shield to keep oil clear though just the same.
Also had the rear suspension apart and removed the plastic seats for the coil springs so now the coils are making a metal to metal contact. Coils are from Germany and are what's used in Abarth 1000 coupes. Car sits about 40mm lower in the rear now and is obviously what I should have done when I first installed the coils.
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Old 04-04-2018   #52
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Formula Ford Avons. Tyre on the right is the front and the tyre on the left is a rear tyre now going on the front. Lot more rubber! Had to roll the fender quite a bit. The side view shows the new stance. Weight is on the front though the wheels are off the trailer. Measured the camber at the rear at 2 degrees negative.
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Old 23-07-2018   #53
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Hillclimb yesterday. Made some modifications to the nose cone!


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Old 23-07-2018   #54
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Good to see you are ok. Hope the repairs are easily done.
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Old 24-07-2018   #55
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Quote Originally Posted by Jayarr View Post
Good to see you are ok. Hope the repairs are easily done.
Thanks. Checked underneath yesterday and there is no damage. Front is pushed in between the headlights but will be an easy repair, should push out OK and a bit of metal shrinking it will be as good as new. No headlights, just fibreglass covers so that reduced the damage. Some tyre marks on the side that will polish out!
This is a photo on the previous run.
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Old 24-07-2018   #56
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Actually I posted an older photo by mistake. This one is from Sunday and it has the larger front tyres. Formula Ford rears all round now.
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Old 04-09-2018   #57
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Re: Fiat 850 Coupe Hill Climb/Sprint car

This is my first run of the day on the 22nd of July. Siting run before I bent the car. Painting up the front at the moment.
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Old 1 Week Ago   #58
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Re: Fiat 850 Coupe Hill Climb/Sprint car

Hill climb last Sunday. Engine ran fine but had handling problems. The Avon crossply race tyres don't like negative camber. Planning on switching to the new Yokohama A048 That Formula Ford run now.
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