Timign advance at idle on TT conversion

[Phattlard]

Just wrapped up a conversion, and my logger has shown like 24 degrees gin advance at idle.........anyone know if that is close? the engine soudns and runs great otehrwise

[J-Groove]

Here is a tid bit from Datalogger 101

Originally Posted by datalogger 101

TIMING ADVANCE
This is my personal favorite gauge on the TMO gauge package. You can watch you timing retard as you go through the gears. The more it retards the more knock you have. Ideally you want around (no less than) 15 degrees advance (maybe slightly more) at WOT. As stated on the main page, any more advance and you can probably turn up the boost a little more, any lower advance and you are getting too much knock and it's killing power. This is the same for race gas and pump gas. Putting in race gas and not turning up the boost or not leaning it out will get you more advance but assuming you want to go as fast as possible, you should make more boost and/or lean it out more and then the advance may go back down depending if you have knock or not. Personally I wouldn't let the timing advance go to less than 15 degrees total advance at WOT. With race gas you may not get it to go below 18 or 20degrees even at 25psi boost.
This value is directly related to knock sum however it's not so with actual boost. The amount of boost you can run depends on a lot. Most people think about the amount of fuel, and they are right. But you can't forget about charge temps. Let's say you don't have an intercooler at all. You won't be able to run as high of boost even with plenty of fuel, you'll get knock because of the higher intake charge temperatures. Getting a good intercooler (front mount is best) really takes the charge temps down and will allow you to run a little higher boost than without it. The efficiency of the turbo you have also comes into play. A 14b turbo is not as efficient at 20psi as a 16g is, and the 16g is not as efficient at 20psi as a 20g is. If you push a small turbo too hard, all it does it heat up the air too much.

-John

[Phattlard]

cool man, I was getting 18 19 degrees advance at 5-6 psi, so maybe turn soem boost up? thanx for thr info.