I've been lucky to have a dyno tuned timing map to copy over from the pfc. In between the engine and the fan shroud is the spot on SR20 engines, and with better light than in the photo, you will be able to see pulleys. It should be noted that it inaccurate to set the timing to 15 degrees BTDC. This guide assumes that the timing chain is installed correctly. Note that this connector must be bolted down tightly for the connector to work - often a bit tighter than you can get with a nut driver, so you will … Another cause of detonation is lean fuel mixtures, which raises cylinder temperatures dramatically. Timing is adjustable with both a distributor and a crank angle sensor by rotating the unit. I have read a few forums with people saying 10 degrees through midrange and increasing to above 14 degress after peak torque is reached. The Ghost Map Trace function leaves markers on the used portions of the map for easy reference. I may have a starting map that I know to be a good place to start from but I always tune each engine individually on the dyno using knock detection equipment to ensure the timing is optimal. This is different to adjusting the ignition timing in the ecu, which varies according to load and rpm, but it will affect it directly. The piston may still be travelling up the bore in its compression stage, and is suddenly met with the force of the flame fronts trying to push it downwards, leaving no where for it to travel. News, products, problems and results. An engine's ignition-timing requirements will vary, depending on dozens of variables like compression ratio, fuel octane, combustion-chamber shape, and inlet air … Individual cylinder ignition trim is included. Advancing the base ignition timing is a simple modification that can be done to almost any car. The sr20det engines do not like timing. A coil-on-plug ignition system delivers precise spark timing for optimal combustion and performance. Please enter your details below to sign into your account, Please enter your details below to register for an account, This email is already in use. There are two general trends to the shape of an ignition map and they are consistent regardless of the engine type. I am using Nistune to tune with at this point in time. I have tuned the fuel and ignition safely to suit the the bigger t3t4 style turbo, 550cc injectors and z32afm. For example i have seen that sr20det maps seem to have a low spot in there maps where peak torque is and once that is reached timing can be advanced more towards red line. This will result in loss of compression and increased oil consumption, if the engine will run at all. This picture shows where the timing light is to be pointed, as shown in the picture above. Readings from sensor should match to actual temperature of coolant and air in intake manifold. car is only reaching 95 on the load scale. For example i have seen that sr20det maps seem to have a low spot in there maps where peak torque is and once that is reached timing can be advanced more towards red line. If the base timing is forward 3 degrees, then the actual timing will be 21 degrees BTDC. 1400 (At intercept≒17500μSEC, and under high area (nearly the rev limit) ≒15700μSEC afterward.) As can be seen, the ECU is wanting 22 degrees so blindly setting it to 15 would have the base timing retarded by 7 degrees. Done! This thread will contain base timing maps for people to work with. Read more about becoming a Gold member here. Before the car was properly warmed up, the reading was around 40 degrees BTDC. Need to sync the software timing to mechanical timing. A fixed notch will protrude above the markings on one of the pulleys. E85 works fantastic on this engines and really solves EGT problems! Forum » General Tuning Discussion » sr20det ignition map. After, it was locked at 22. Unbolt the panel and you are then able to unbolt the ECU. Repeat as needed to obtain the best setting. Is this something that happens in your experience? It was equipped with variable valve timing system VTC on the intake camshaft, modified intake manifold and 50mm throttle body. The marks will be on one of the belts or pulleys. The inductive clip is often fragile, so take care. 3 - Tachometer signal output - Yellow Red . How To Set CAS Timing on the SR20DET Resetting your engine's timing back to factory setting is pretty straightforward thanks to the markings provided on the CAS, cams, and pulleys. 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