This is the goal, and it does get there, but too late for my liking. I actually expected more knock but it didn't show on the 3rd batch of runs. The next day with only minor fuel trim and start parameter changes the knock went to 12 at WOT at >5,500rpm (no SES light or code and I don't know why it changed the next day, except for a larger IAT temp change and a new tank of fuel from a different station), so I backed off the timing to where I was on round 2 and I haven't done any more WOT runs since; I am guessing the typical SST transmission slip was helping that out, as I didn't see any timing reduction in the log.

A little dramatic, but I fully understand the intent and the consequence of staying too close to the sun with wax wings! As far as AFR goes, I see the wide band reading roughly 0.5-1.0 unit higher than the OEM front O2 at WOT.. It appears to be closer at stoich during cruise and idle. They probes sit close to each other ahead of the CAT, so they see the same conditions. I haven't reached out to AEM, but the 4110 and Bosch probe are supposed to self-calibrate and not require adjustment. I don't even know if it can be adjusted in the field. In any case, I still don't like the amount of jitter it has when in use and I would love to try another unit for comparison. If I was going to run the vehicle hard, I would certainly look at trying out a different probe/gauge combo. $250 is cheap insurance compared to fixing a broken engine!

Posting updates for now, maybe one more to go. I was debating when to switch to the tuning threads as the stock block build is pretty much done. The wife said so!

I have cobbled together a lot of tuning ideas from the gurus of the past decade, but as you both know, some of the better info has vanished from both this site and the other ones, and there was a lot of garbage posted as well. Right now I am researching SST parameter changes, but I haven't found much definitive information and it seems that the results are different between the years, models, and respective base tunes. Without being my own test monkey there is little I could find outside of buying a tune from one of the more acknowledged/accomplished tuners. I did make a few changes to eliminate some of the programmed slip, but I don't see myself setting the car up for boosted launches and I don't want to stray too far into limit testing for the clutches. Perhaps an e-tune is in my future.

 

A window in your block is usually dramatic.

That is how narrowband sensors work. They are accurate at stoich but get exponentially inaccurate the further away from stoich. The narrowband isn't even used in open loop operation so it's useless to compare wideband and narrowband during WOT operation.

What kind of timing are you using?

 

You shouldn't even be making pulls at >12.0 AFR on 91. As soon as its in the 12's at full boost should be an immediate abort run and go back and add fuel. You're seriously risking melting a piston doing things this way.

The stock front O2 sensor is a narrow band and should not be referenced for anything other than dialing in idle and cruise fueling (basically the base map; injector/maf/map tables) with the short term fuel trim.

 

I really hope this thread doesn't turn into another "my motor blew up" thread...

 

Thanks for the info on the 02. I still hate the constant up and down movement +- 0.5

The timing that created the knock was pretty aggressive and similar to what was posted in previous year's threads. Perhaps I am still too aggressive in the mid RPM.

 

It shouldn't. To be honest, you guys drove and drive your cars a lot harder than I do. I do thank-you for your concern.

 

Keep doing pulls at >12.0 AFR and it definitely will..

Posting the timing maps doesn't help, we needs to see a datalog as we don't know what load value your car is seeing. But timing looks high guessing on what a X normally sees for load.

 

Are you running 260+ load across? If not, your timing is way too high. Also, depending on your mivec mapping, your ignition timing should have a nice downward curve into higher loads.

Can you post a log?

 

OK guys, let's move this to the tuning discussion. Before I shift it there, it looks like I made a mistake in scaling the injectors; I should have stopped scaling after the first corrections to the modified fuel tables As a result I over-scaled them thinking they may have been 1,000cc injectors versus 850s. At one point I actually had a over-rich code further exasperating my thought process on the scaling! With the scaling being too high, that caused the fuel tables to be somewhat useless to bring down the AFRs. So, I am taking a few steps back to rescale the injectors again.

Now, I am still waiting for EvoScan to send me the program download link and PIN. It seems no one is returning emails even after I paid them. In the meantime I had been using the Tactrix stand-alone logging, but I don't have all of the parameters defined and if I use too many in the logcfg file, then some values are clipped. So, if anyone has the LOAD parameters and call address, please post it or direct me to it. Thanks.

 

Yea, if you log too many things you will drop rate. You can speed up the logging rate a little bit over what is set as default by changing the "calcsampinterval" number.

What ROM ID are you using?

The parameters for load are:

Once you get Evoscan you can use RAX logging which is much faster than normal mode23 and you'll be able to literally log EVERYTHING with no data rate drop.

 

55580006 includes 55580005

Hopefully they will respond sometime this week.

BTW, with the scaling lowered the AFRs are much better now with higher TPS and load. It still needs a bit of tweaking, but not too much.

 

Should be 0x808784

 

Thank-you Bryan! I have that one listed as LoadFuel, but the numbers seemed a bit off. I'll look at it again.

Also, thanks for all the years that you have been contributing to the Evo community under different usernames. Your handle has shown up in the discussion of many items, and I suspect some of those tables are your contribution to Merlin's guide as well.

 

Just an update.

Here we are 3 years later and the car is running well. With an aggressive tune, and the SST, it could trigger limp mode if the boost rose to high and too rapidly above 25psi. I dialed back the tables to reduce the boost and that fixed the limp trigger. The AFR under load was reading leaner than expected as the rear of the car showed tell-tale signs of over-fuelling. I haven't switched out to a new or different wideband unit to see if the numbers changed, but I don't plan on chasing HP numbers. Last year I switched to a mid-power tune that is enjoyable to drive, but gets great fuel economy when driven with a lighter foot.