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Originally Posted by 93W91SER
Looks like ^^you^^ are missing the link in your engine that wakes it up. Yes 15* is what FSM says. I (and everyone else here on the forum) run mine around 19-21*. You gain so much response for free. You have to run 91 octane, but I run 93 just to be safe. See if you can elimnate the cylinder it is happening on by unplugging the injectors one by one. When the noise stops, you know which one to check out.
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Here is what a "guy named Mike Kojima" has to say....ever heard of him?
Timing
Here is the all time cheapest hop up that anyone can do. Typically most SR20DEs have the timing set to 13 degrees or less from the factory. I have seen as low as 10 degrees on a brand new factory fresh car. You can safely run up to 15 degrees on regular gas on most SR20DEs. For best performance on a stock engine, put in 92 octane and dial in between 17 to 19 degrees. This has been proven by recent dyno testing on a stock car to give up to 6 more hp at the wheels. Remeber if you have your timing turned up this high you MUST use 92 octane fuel. Do not exceed 17 degress of advance if you have a JWT ECU.
Don’t tolerate any detonation though. Detonation will kill your engine quicker than lard and coconut oil will kill you! I am putting the detonation warning in here because the timing pointer on the engine can be easily bent which could cause you to accidentally over-advance your timing! It happened to me so be careful! If you have the JWT ECU, set the timing at 15 degrees.
On the dyno I have not seen any difference between 15 and 17 degrees with a JWT ECU although bottom end snap might feel a little better. It is better to be safe at 15 than on the edge at 17 for only a perceived difference in throttle response. Be sure to disconnect the TPS when adjusting the timing and remember that the JWT NOS module requires that TPS terminal 1 and 2 be shorted out when setting the timing.
