Let's discuss spark advance
This whole thread simply means 1 thing
was and is right and yall are big ole ****** when it comes to timming. I had a map like bens from the outset and always had good economy in criuse and throttle response.
was and is right and yall are big ole ****** when it comes to timming. I had a map like bens from the outset and always had good economy in criuse and throttle response.
Joined: Jun 2005
Posts: 19,338
Total Cats: 574
From: Fake Virginia
Joe,
While you're working on timing... shouldn't you be working on INJECTOR timing? There are likely both efficiency and smoothness benefits.
The MS3 can do that too.
Here's mine:

I created a rough ignition diagram for the 2001 with VVT to generate it.

The collective googles suggest that you want the squirt to END just before the intake valve opens. Depending on where your intake cam is opening (this information is available various places like SOLOMIATA if you want to do it yourself and calculate the squirt durations in terms of RPM and cam angle.
While you're working on timing... shouldn't you be working on INJECTOR timing? There are likely both efficiency and smoothness benefits.
The MS3 can do that too.
Here's mine:

I created a rough ignition diagram for the 2001 with VVT to generate it.

The collective googles suggest that you want the squirt to END just before the intake valve opens. Depending on where your intake cam is opening (this information is available various places like SOLOMIATA if you want to do it yourself and calculate the squirt durations in terms of RPM and cam angle.
Thread Starter
Joined: Sep 2005
Posts: 34,402
Total Cats: 7,523
From: Chicago. (The less-murder part.)
Bear in mind that I recently made some significant changes to my AFR Targets table, which have not yet had time to be fully integrated into the VE table. Also, I think a went a bit too low on the MAP threshold for transitioning out of stoich, I may bump that up a few kPa- it's coming in way before WOT.
Actually, now that I think about it I may just leave it like this and let it richen the VE table slightly, then once I'm done with VE Autotune, change it back to 14.7 across the board and use TPS > 90 as the switchpoint out of closed-loop. That way below 90% TPS it'll seek stoich, but > 90% it'll go open-loop and be slightly rich.
Ok. Here's the corrected AFR:

(note that because the AEM UEGO is a piece of ****, and I'm too lazy to come up with a custom calibration for it, the ACTUAL AFR which results is about 0.6 leaner than the target at stoich. Thus, 15.3 = 14.7. My narrowband sensor confirms this, and I assume this miscalibration to be more-or-less linear.)
VE:

and Spark:

Again, these are all works in progress, not finished product.
(Why the hell don't I have my own smiley on this forum?)
Here's what I'm running at the moment (end of squirt):

Looks a lot like yours, actually.
Last edited by Joe Perez; Nov 29, 2012 at 06:04 PM. Reason: I had the dumb.
I'm sure he would hit 100kpa before wot. If he plans on keeping the open loop closed loop separation TPS activated it will cause problems since the ECU will try to go for 12.5 which based on his wideband calibration is 11.9afr.
Thread Starter
Joined: Sep 2005
Posts: 34,402
Total Cats: 7,523
From: Chicago. (The less-murder part.)
Joined: Jun 2005
Posts: 19,338
Total Cats: 574
From: Fake Virginia
Joe,
If you have the old AEM UEGO with out any serial output the afr offset may not be linear. The one I use has a calibration that looks like this (blue line):

The calibration came as part of the installation documents.
If you have the old AEM UEGO with out any serial output the afr offset may not be linear. The one I use has a calibration that looks like this (blue line):

The calibration came as part of the installation documents.
Thread Starter
Joined: Sep 2005
Posts: 34,402
Total Cats: 7,523
From: Chicago. (The less-murder part.)

Mine is the gauge style, 30-4100, which the manual claims has a linear output from 0v = 10:1 to 5v = 20:1 when in mode P0 (default). Here is the chart printed in the manual:

It is most definitely supposed to be linear, it just sucks.
Got it, avoid AEM widebands.
This guy claims 38mpg+ at cruise using a NBO2 (14.7AFR) primarily by tuning timing: Hydra, 38mpg+, power and smoothness like no other
Unfortunately he doesn't really discuss his methodology or even provide the resulting timing map.
Unfortunately he doesn't really discuss his methodology or even provide the resulting timing map.
Thread Starter
Joined: Sep 2005
Posts: 34,402
Total Cats: 7,523
From: Chicago. (The less-murder part.)
It may well be that the newer ones suck less, I honestly don't know.
Incidentally, you mentioned "the old AEM UEGO with out any serial output" previously. Looking through AEM's current offerings, it does not appear that any of their wideband systems offer a serial output, except for the Wi-Fi and OLED versions, and those are only via USB. Am I missing something?
Incidentally, you mentioned "the old AEM UEGO with out any serial output" previously. Looking through AEM's current offerings, it does not appear that any of their wideband systems offer a serial output, except for the Wi-Fi and OLED versions, and those are only via USB. Am I missing something?
Whatever the cheap one with the gauge is should. AEM Net or something like that. Only works with other aem products. Should be the blue wire on the gauge as the serial data line.








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