Another timing question.

[DRIFTINGmy85]

What degree of timing is too far advanced? Assuming the cam and crank are set properly. What is the safest degree to typically advance the timing to?

Thanks.

[Tanya]

15 degrees BTDC is as far as we usually go

[bshapton]

What degree of timing is too far advanced? Assuming the cam and crank are set properly. What is the safest degree to typically advance the timing to?

Thanks.

According to a very knowledgeable senior Toyota tech on a Cressida list, the ECU will try to compensate for any mis-adjusted timing, so whether you are at 8 or 12 degrees you're gonna get what the ECU wants you to get according to the parameters present at a given moment. He says it's not like the old mechanical distributors with an advance curve working off the static setting.

Bob

[DRIFTINGmy85]

Okay, I set it to either 12 or 15. Don't remember but I didn't want to put it too far ahead and hurt something.

Thanks!

[bshapton]

Why not set it at the factory spec then? Toyota engineers are pretty competent. What is the benefit of messing with the setting?

[Supra5MGTE]

you'll take advantage of the advanced timing until you get Detonation. It's not going to "compensate" until it hears Knock. So only on 85/86 models will it be able to compensate. so if you have say an 84 with no knock sensor, you are your knock sensor. better listen up. 15* is as far as I'd advance it.

[Donn29]

the reason advancing the dizzy changes the timing, is that the ecu looks at the VR sensors in the dizzy. so the ecu thinks its still set properly. but is firing the coil slightly later or ealier.