Witch would or will make more power..would you like to have more boost or timing.

 

boost will make more power...

 

I don't think the way the question is phrased makes a lot of sense. For any given combo there is advance that will produce the most power. Most LT1's seem to want ~26 degrees advance. But it needs to be determined empirically for each combo. Best is a dyno, but trap speeds will do in a pinch.

Rich

 

Rich when you say 26* is this in the tune or what you see on the scan tool.

Yes every given combo is diff in what it likes....BUT what i am asking is would you rather have more timing or boost to make more power....

Or Rich is what you are saying is "most" LT1's like 26* timing and just put as much boost to the combo as you can...

Every person is allways after boost you never here anything about timing..

 

Rich when you say 26* is this in the tune or what you see on the scan tool.

~24 degrees in the timing tables if you are using the factory ECM, which equates to ~26 degrees.

Yes every given combo is diff in what it likes....BUT what i am asking is would you rather have more timing or boost to make more power....

Or Rich is what you are saying is "most" LT1's like 26* timing and just put as much boost to the combo as you can...

The latter, I would say that it's going to make max hp with ~26 degrees and as much boost as it can tolerate without detonation. Keep in mind that these are gross generalizations and probably oversimplify the tuning issues. But they are a decent place to start.

Rich

 

Why do people put the timing into the 30* (timing tables) with the
aftercooler...or intercooler

 

Jeremy, i would start low, like 18-20 degrees and increase it on the dyno till its optimal.

 

Either because they are just tuning by "feel" or by what they have heard or their combo needs that much timing. Like I said, my gudeline is a generalization. The only way to really find out is to test it. But more timing does NOT = more hp. The most power is from the "right" amount of timing.

Rich

 

My 23* boosted small block likes 24* with no difference to 28* so no sense having it any higher than 24*

 

They all seem to want about that much advance. It's pretty consistent. Same thing applies to AF ratio. It wants what it wants. 12-12.5:1 pretty consistently produces the most hp on SC small block OHV motors. I have seen it time and time again.

Rich

 

Cool thx guys..

Rich, this AFR thing 12-12.5...why do you see guys with there AFR 11-11.5 this is a little on the rich side is it not. Safty i can see, But other then that why?

I have read that when on ALKY (100%) you should have your AFR 11-11.5 because the dyno WB o2 will not read it and with ALKY you go lean...is this true. Or do you just keep it @12ish on and off the ALKY.

 

Why is it the FI eng's like lower timing vs. NA eng's....

 

If your question is what is more important, timing or boost, here is what I have heard from people who tune extreme combos.

They prefer to run as much timing as possible while tending not to exceed stock timing.

Now in most FI applications it's fairly rare to find someone running stock timing. Why is that?

I think that most folks, myself included, are in love with the idea of making a lot of power and feel that BOOST is where it's at.

A question you might want to consider is, with 7psi + stock timing advance make as much power as 9psi and say 15 degrees of timing. Maybe.

You can pick up a dramatic amount of power with timing, assuming your combo can handle it.

If you are not sure what your combo is capable of, or you are unsure of it's limitations, I would start out at 15 degrees of timing and go from there. I would not want to go much lower than that.

I run 21 degrees of timing at WOT, 21 psi, 8.2:1, and C16. I might be able to just use 110 leaded or even 104 unleaded but I'm not looking to explore that right now.

 

More efficient? But we are talking boosted timing numbers here.

 

i run 29 deg. with 16# boost and small nitrous, but most people shudder when they here that. my motor has always liked it though and it was built to handle alot more than 16#.