NA timing values, what are yours?

Hey guys, I have been tuning my car now for a little over a week with my AEM stand alone. I have my AF dialed in good enough for now and now I want to start adding timing to try and wake it up. I'm not going to mess with the AF anymore until I start adding the timing as adding timing will tend to lean it out a little. Based on my datalogs I'm seeing ~26* of timing at ~4300 under WOT and it slowly makes it way to a maximum of 28.7* at 6200rpms. The car still feels very sluggish and I'm hoping that adding a bit more timing will really wake it up. I have been hitting the base timing table that came with the AEM with a "global" type of adder like I used to with my eec tuner. All I have added thus far is 3* to the base and it still feels slow. I remember that most HCI combos liked anywhere from 32-36* of total timing. What have you guys found in your NA combos that worked best? I'm looking for any of the following: stock compression, low compression, high compression, 302, stroker, etc NA combos. Also, what kind of timing are you guys seeing down in the lower load/rpm tables during cruise and part throttle? Here's a brief datalog I did this weekend while tuning it. Top red line is RPM, middle is AF ratio, and the bottom is timing.

Thanks! That is more along the lines of what I thought I'd need to be at. I have to watch down low though as I'm already approaching the high 30* range and I don't know if its safe to go much higher than that.

Anyone else have any input?

Thanks Grady! That is very helpful. I too was worried about developing a mid load ping as the values are already pretty high there with the 3* I've already added. My only other concern is will I get any weird stumbles and such if I abruptly go from say 25 at part throttle instantly to 34* at WOT without a smooth transition between the two?

final5-0 said:

As I see it ... you just have to ramp it up and how gradual each
step turns out to be is dependent upon how many points you
got to work with.

I don't know how the AEM does its thing but as you know ...
with the EEC Tuner & Tweecer you got not only rpm but
load to play around with so that has not been any kind
of problem that I have been able to see.

It is a lotta fun to see what all you can do
with your tune when you have something that
makes sense to you ... isn't it

Grady

Click to expand...

Luckily Grady, the AEM is much more straightforward than the stock EEC stuff. Here is my timing table, this is all I need to adjust... its much easier than the stock tables huh? My load is on the left and its based on my MAP sensor readings which are displayed as PSI (which is negative in my case since I'm NA), and the bottom is RPM.

I can display it in two forms and I can edit either one. Here's the table which is my current timing table:



Here it is in graph form:



Here is the same graph after I hit the high load cells with a commanded 34* of timing. The graph really shows how abrupt the change is:

Table with 34* commanded:



Graph with 34* commanded:



Do you want one yet Grady? With the help of my buddy Mike I setup my two step that is activated via my VSS and I'm now using my check engine light as a shift light!!! You can do so much with this thing it still blows my mind. You couldn't give me an eec tuner now. I have no idea how on earth I even used that thing, especially concidering I didn't have any sort of GUI interface and used only the stock software.

Thanks zenboy99, I'll give that a shot!

blksn955.o- The AEM is a complete stand alone. I only used the global when I had the stock T4MO and eec tuner in my car. I see now why that may not have been the best thing.