Timing resolution

What is the timing resolution with a ProEFI, in an 05 6MT base model 350Z that redlines @ 6500 rpms? What are the smallest RPM increments to advance/subtract timing into individual cells? I'm not familier with your ems, but I have a Utec and have watched it being tuned. This will be a forced Induction 4.2 liter setup running 10.0 CR with 8 to 12 psi boost. Thanks in advance BrazenZ

Timing resolution is in the hundredth of a degree. So if you are so inclined, you could change your timine by .01 ata time.

Admin wrote:

Timing resolution is in the hundredth of a degree. So if you are so inclined, you could change your timine by .01 ata time.

That's great, but I meant the smallest increment in rpm, as in every 250, 100, 50, or 10 rpms.

BrazenZ wrote:

Admin wrote:

Timing resolution is in the hundredth of a degree. So if you are so inclined, you could change your timine by .01 ata time.

That's great, but I meant the smallest increment in rpm, as in every 250, 100, 50, or 10 rpms.

ohhh....you mean RPM axis resolution....those are also in hundredths as well...so you can set an rpm axis value at 2501.01 if that's what you want.

Let me see if I understand you correctly. At the same boost level, If I put a timing value (x) in at 2500rpms, I could put a new value (y) at 2500.01 rpms? Could I do this in .01 increments all the the way to 6500 rpms, if I wanted to? I do realize no one would do this from a practical standpoint.

BrazenZ wrote:

Let me see if I understand you correctly. At the same boost level, If I put a timing value (x) in at 2500rpms, I could put a new value (y) at 2500.01 rpms? Could I do this in .01 increments all the the way to 6500 rpms, if I wanted to? I do realize no one would do this from a practical standpoint.

The RPM would be on the 'X' axis, and you only have so many sites to work with, so if you did something as insane as that, you would quickly run out of available sites.

ProEFI

So on the range of 0 to 6500 rpms what are the smallest practical rpm increments ? Exactly how many "sites" on the RPM axis do we have to work with?

BrazenZ wrote:

So on the range of 0 to 6500 rpms what are the smallest practical rpm increments ? Exactly how many "sites" on the RPM axis do we have to work with?

17 sites on the RPM axis. These are usually set up in 500 rpm increments. You can move the sites around like I stated earlier, so if you have a "problem area" at 5k rpm, you could make 4800, 5000, 5200...etc...


ProEFI

17 for the rpm axis and 17 for the load axis ( I'm guessing ) so it is 17 x 17 resolution. Dang, my Utec is 12 x 12, the Haltech PNP is 32 x 32. Isn't more resolution better?

BrazenZ wrote:

17 for the rpm axis and 17 for the load axis ( I'm guessing ) so it is 17 x 17 resolution. Dang, my Utec is 12 x 12, the Haltech PNP is 32 x 32. Isn't more resolution better?

I could make the maps 64x64 if it were necessary, but all that really does is require a ton of work by the tuner for no reason. 17x17 is more than enough to do the job. Rember, the ProEFI is Volumetric efficiency based. It's not a bigger is better scenario, if bigger is better always held true, we would all be driving around in old cadillacs!

ProEFI

I don't know what old cadillacs have to do with tuning, but I think most people would like to be able to adjust there timing around 200 rpm increments ( isn't that what OEM equiped does?) Does ProEFI interpolate between sites? If I have 30 degs. advance in cell (4000 rpms), and 40 degrees in cell (4500 rpms) would the timing jump from 30 to 40 @ 4500 rpms?

BrazenZ wrote:

I don't know what old cadillacs have to do with tuning, but I think most people would like to be able to adjust there timing around 200 rpm increments ( isn't that what OEM equiped does?) Does ProEFI interpolate between sites? If I have 30 degs. advance in cell (4000 rpms), and 40 degrees in cell (4500 rpms) would the timing jump from 30 to 40 @ 4500 rpms?

no...the O.E's don't use any more than they need to....some don't even use maps for fueling. The ecu interpolates at .00 so your more than fine.

The ecu interpolates at .00 so your more than fine.[/quote]

Would you please explain in more detail? Do you mean that ProEFI interpolates in 1/100 increments?

Quote :

Would you please explain in more detail? Do you mean that ProEFI interpolates in 1/100 increments?

Basically, if you have an rpm site of 2500, and the next one is 3000, rpm will climb at a processed step rate of 2500.00, 2500.01, 2500.002, etc... So there are 50,000 steps between 2500 and 3000. If your ignition timing at 2500 was 20 degrees, and at 3000, your ignition timing was 25 degrees, there are 500 steps between the two timing numbers. So every rpm increment of 1 rpm, the timing will move .01, so 2500.00 is 20.00, 2501 is 20.01, 2502, is 20.02, etc... Makes Sense?


ProEFI

^^ That sounds badass!

Thank you for explaining, now I understand why a 17x17 resolution is all you would ever need.

BrazenZ wrote:

Thank you for explaining, now I understand why a 17x17 resolution is all you would ever need.

Your more than welcome! The idea is to try and make the best possible solution requiring the least amount of work!

ProEFI