With my last post I hoped to ge some discussion going on the forum, but no luck.

Let's try this one.
Do you advance timing or not when tuning?
When do you when do you not?

Love to hear what's your opinion.

I tune mostly naturally aspirated petrol engines and there you dont have many other options for making more power then advancing the ignition and evening out the lambda. So yes i usually advance ignition in my application....

In turbocharged engines i usually dont bother since adding advance have diminishing returns compared to optimizing fuel and boost.

Awesome thx for the reply.
Yes, that sounds very logical. On naturally aspirated engines you don't have lot's of options to gain power, so yeah advancing is a must.

boris7589 wrote:I tune mostly naturally aspirated petrol engines and there you dont have many other options for making more power then advancing the ignition and evening out the lambda. So yes i usually advance ignition in my application....

In turbocharged engines i usually dont bother since adding advance have diminishing returns compared to optimizing fuel and boost.

As far as I understood your point, it seems you are saying that power extraction from turbocharged engines relies mostly on lambda optimization, whereas tuning the timing is not as effective of a method in comparison. Why is that? Would you say that spark tuning's role in turbocharged engines is managing engine knock, resulting from higher boost pressure?

I'm no gasoline engine expert, but when it comes to timing and turbocharging there is not much difference in effect except that you have knock on gasoline.

For me timing does has an influence even with turbocharged engines.
For me most people don't mess to much with timing, because it's safe to have a retarted timing then to much advance and risk having knock.

When you raise your injection pressure you inevitably go and advance your timing, so that's why most don't bother to change the timing.

You can go and advance timing but to do it spot on you need a dyno and many, many, many runs or an ecu where you can change your timing live on the dyno to have a perfect timing.
A later timing also gives better turbo spool so it's a bit of what you want in your tune. If you want max torque you need to advance your timing as much as you can without creating knock.
But in the end having a good AFR and a steady boost is even important on turbo engines.

capske wrote:I'm no gasoline engine expert, but when it comes to timing and turbocharging there is not much difference in effect except that you have knock on gasoline.

For me timing does has an influence even with turbocharged engines.
For me most people don't mess to much with timing, because it's safe to have a retarted timing then to much advance and risk having knock.

When you raise your injection pressure you inevitably go and advance your timing, so that's why most don't bother to change the timing.

You can go and advance timing but to do it spot on you need a dyno and many, many, many runs or an ecu where you can change your timing live on the dyno to have a perfect timing.
A later timing also gives better turbo spool so it's a bit of what you want in your tune. If you want max torque you need to advance your timing as much as you can without creating knock.
But in the end having a good AFR and a steady boost is even important on turbo engines.

+ need to see where it retards timing, and where is reducing boost must be seen together.

you need to have high octane petrol sometimes original timing + more boost then ori wont be safe

lvnts wrote:

capske wrote:I'm no gasoline engine expert, but when it comes to timing and turbocharging there is not much difference in effect except that you have knock on gasoline.

For me timing does has an influence even with turbocharged engines.
For me most people don't mess to much with timing, because it's safe to have a retarted timing then to much advance and risk having knock.

When you raise your injection pressure you inevitably go and advance your timing, so that's why most don't bother to change the timing.

You can go and advance timing but to do it spot on you need a dyno and many, many, many runs or an ecu where you can change your timing live on the dyno to have a perfect timing.
A later timing also gives better turbo spool so it's a bit of what you want in your tune. If you want max torque you need to advance your timing as much as you can without creating knock.
But in the end having a good AFR and a steady boost is even important on turbo engines.

+ need to see where it retards timing, and where is reducing boost must be seen together.

you need to have high octane petrol sometimes original timing + more boost then ori wont be safe

Higher octane fuel decreases the the combustion delay on diesel and makes the flamespeed go faster in petrol so this will indeed advance timing which could be bad.