HELP! Blew engine, and am now paranoid. Need help/opinions.
Its mostly personal preference, but certain rpm and kpa breakpoints are definitely helpful.
IMO:
You want at least one row in high vacuum, 10-20kpa
You want as many rows in the part throttle and cruise areas because that's where you'll be most of the time
You want at least one row over your target kpa in case you overshoot target
You want 1 rpm row lower than your idle target, 1 at target, and 1 slightly over
You want to stagger them evenly in the midrange/cruise
You want 1 rpm row at or a little past your redline/fuel cut
That's how I try to set mine up anyways
IMO:
You want at least one row in high vacuum, 10-20kpa
You want as many rows in the part throttle and cruise areas because that's where you'll be most of the time
You want at least one row over your target kpa in case you overshoot target
You want 1 rpm row lower than your idle target, 1 at target, and 1 slightly over
You want to stagger them evenly in the midrange/cruise
You want 1 rpm row at or a little past your redline/fuel cut
That's how I try to set mine up anyways
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Junior Member
Joined: May 2011
Posts: 47
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From: UK
personally i wouldn't run quite so lean at 70kPa and high revs.
also, spark table looks much better - i think a 3D plot on your original one would have shown up a wall of timing coming in sharply up to 2300rpm.
also, spark table looks much better - i think a 3D plot on your original one would have shown up a wall of timing coming in sharply up to 2300rpm.
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The table generator will give you something like this:
Yes, it is rich. Hence, it is a safe starting point. I highly recommend turning on "include AFR target" under general settings. Once the VE table is well tuned with VEAL you can go back to change the AFR table for better mpgs.
Yes, it is rich. Hence, it is a safe starting point. I highly recommend turning on "include AFR target" under general settings. Once the VE table is well tuned with VEAL you can go back to change the AFR table for better mpgs.
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Yep, that's why I'm trying to get the best AFR targets that I can so I can manually tund the thing line by line. I learned the hard way that just using VEAL is NOT the way to go.
Thanks,
Jason
Thanks,
Jason
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Pretty sure I have good targets now. Just need to get parts back from machine shop (will probably be a while). Once I get it back together and start tuning, I'll post up my progress. Thanks to everyone for the info that has been provided.
Jason
Jason
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no your targets are bad, you really need to use random generator to come up with good ones, make sure to focus the most on areas youll never hit with a turboed motor; you should scale the table so only 5000RPM and above and 30-70kPa have resolution.
Last edited by Braineack; Jun 30, 2013 at 10:22 AM.
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We have seen so many engine failures due to poor initial tuning. VEAL works well if you give it a good place to start. It is easy to rescale tables, smooth VE, and lean out cruise areas after the tune is safe.
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Joined: Sep 2005
Posts: 34,402
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From: Chicago. (The less-murder part.)
More modern engines (those designed using math and science) have somewhat different requirements.
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So, after looking at what the table generator created, and some of the feedback that was received, I made a few more tweaks to my targets:
Did I make a mistake? Should I go back to what I had?
Thanks,
Jason
Did I make a mistake? Should I go back to what I had?
Thanks,
Jason
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what is the purpose of the AFR table?
my understanding if enabled it is a "goal" that the EMU attempts to achieve [but never does because of the dynamic environment]
in the absence of an AFR, what?
is the VE table the same, a goal?
my understanding is it is a fact, at any given KPa:rpm pair, xxx quantity of fuel is injected
is this right
my understanding if enabled it is a "goal" that the EMU attempts to achieve [but never does because of the dynamic environment]
in the absence of an AFR, what?
is the VE table the same, a goal?
my understanding is it is a fact, at any given KPa:rpm pair, xxx quantity of fuel is injected
is this right
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