My Winter Car Tuning Guide: Engine, Suspension & Performance

Tuning the Corris Rivett in My Winter Car requires precision. An untuned engine may refuse to start, stall frequently, or suffer catastrophic failure under load. This guide covers the essential mechanical tuning required for the Ford Pinto TL20H engine and chassis setup.

1. Engine Timing (Camshaft & Crankshaft)

Timing the engine incorrectly will immediately bend the valves upon the first start attempt. You must properly align the gears before installing the timing belt.

Alignment Procedure

Camshaft Gear: Rotate the top gear so the indicator arrow points directly to the mark on the cylinder head (the 6 o'clock position).
Crankshaft Gear: Rotate the bottom gear so the notch aligns with the mark on the engine block (approximately the 10 o'clock position).

💡 Pro Tip: You must have the crankshaft pulley temporarily installed to see the timing mark correctly. Once both gears are aligned, remove the pulley to install the timing belt, then reinstall the pulley.

2. Valve Adjustment (Rocker Shaft)

The valves regulate the intake of air/fuel and exhaust gases. Incorrect valve lash causes loud metallic clicking, power loss, or stalling.

How to Tune Rockers (Using a 12mm Wrench)

The "Click Count" baseline method for the standard camshaft:

Scroll upwards (tighten) on each adjusting nut until it completely stops moving.
From the fully tightened position, scroll backwards (loosen) precisely 58 to 60 clicks.

Alternatively, the auditory method is highly recommended: With the engine running, tighten each nut until you hear a sharp ticking noise, then slowly back it off just until the noise vanishes.

3. Distributor Ignition Timing

Ignition timing dictates when the spark plug fires. Advanced timing increases power but can cause engine knock, while retarded timing causes overheating and sluggishness.

Tuning the Distributor

Start the engine and wait for it to reach operating temperature.
Slightly loosen the distributor hold-down screw.
Use your scroll wheel to adjust the distributor housing until you hear a faint chirping sound (this means it is too advanced).
Scroll backwards until the chirping stops entirely, then scroll back exactly 1 click.
Tighten the screw. A widely accepted safe AFR/timing sync yields optimal performance at around a 14.75 value.

4. Carburetor AFR Optimization

The Air-Fuel Ratio (AFR) mix determines how rich or lean your engine runs. An aftermarket AFR gauge is highly recommended.

Baseline Tuning Clicks

To establish a functional baseline, scroll the mixture screw downwards (tighten) until it stops moving (60+ clicks). Then, back it off (loosen) by:

Carburetor Type	Clicks Out (Loosen)	Target Idle AFR
Standard Carburetor	~23 Clicks	14.5 - 14.7
Twin/2-Barrel Carburetor	~24 Clicks	14.0 - 14.5
Racing 4-Barrel Carburetor	~23-24 Clicks (All 4 Screws)	13.1 - 13.8 (Rich for power)

⚠️ Cold Weather Warning: My Winter Car introduces freezing temperatures. An AFR of 14.7 might cause stalling during a cold start without the choke. Pull the choke fully out when starting under -10°C, and gradually push it in as the engine warms.

5. Suspension & Wheel Alignment

A poorly aligned chassis will pull the car violently to one side and wear out tires prematurely.

Neutral Steering Alignment

Locate the steering tie rods on the front suspension assembly.
Using a wrench, turn the rod adjustment to its absolute maximum limit in one direction.
Scroll backwards exactly 100 clicks.
Repeat for the other side. This results in perfect neutral alignment.

For rally builds using adjustable performance struts, players often prefer a slightly stiffer rear setup (Bump Max - 10 / Rebound Max - 4) to encourage oversteer on snowy tracks.