Power Vision Information Thread
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
Andy- I can only give a very basic summary of what Jamie changed - I'm sure he can elaborate further. Roy at DJ used a timing delay method to keep injectors on for decel. Jamie changed that back and instead used a MAP-threshold method of keeping injectors on for decel. He also added a bit to my VE tables. The method Jamie used was immediate in positive effect - logs are attached with complete signals, riding in normal mode no auto tune enabled.
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
I have to honestly say I have no idea why the changes worked but they did- I am looking at the logs and the same decel events show 17.9 AFR, same as before. and my decel VE's are lower than before, my AFR's in that area are leaner than before. my decel timing is the exact same as before.
my logs show the requested 12.9 AFR for the decel event map, rpm and 0TP - but WBO2 F/R report 17.9 AFR (meaning injectors did shut off, correct?)- and no cherry bombs. Mr. Wizard did some magic that I clearly do not understand
my logs show the requested 12.9 AFR for the decel event map, rpm and 0TP - but WBO2 F/R report 17.9 AFR (meaning injectors did shut off, correct?)- and no cherry bombs. Mr. Wizard did some magic that I clearly do not understand
Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
Most of what he did was turn off the injectors in over run. No fuel, nothing to burn in the exhaust.
We can hand tune the fuel in a little closer if you want.
You do have some knock on the rear that we may want to deal with.
Andy
We can hand tune the fuel in a little closer if you want.
You do have some knock on the rear that we may want to deal with.
Andy
I have to honestly say I have no idea why the changes worked but they did- I am looking at the logs and the same decel events show 17.9 AFR, same as before. and my decel VE's are lower than before, my AFR's in that area are leaner than before. my decel timing is the exact same as before.
my logs show the requested 12.9 AFR for the decel event map, rpm and 0TP - but WBO2 F/R report 17.9 AFR (meaning injectors did shut off, correct?)- and no cherry bombs. Mr. Wizard did some magic that I clearly do not understand
my logs show the requested 12.9 AFR for the decel event map, rpm and 0TP - but WBO2 F/R report 17.9 AFR (meaning injectors did shut off, correct?)- and no cherry bombs. Mr. Wizard did some magic that I clearly do not understand
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
You have to ask yourself what decel pop is. It is raw fuel being ignited in the exhaust because the exhaust temp is higher than the flashpoint of the raw fuel. By adding fuel to the decel area you lower the exhaust temp below the flashpoint of the fuel. I've been using this method for well over a decade. It works.
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
What did you mean by tuning the fuel in closer - reported AFR's vs set lambda?
Yes I completely agree and that is typically the method I approach this issue with- Adding fuel and in some cases advancing decel timing. Nothing I did along those lines helped on the very narrow rpm backfire issue at hotter ET's, and the issue itself only presented after moving to the Target Tune and wide band operation. Decel overall was fine- just that single anomalous event was way out of hand and not responsive to typical fixes. But in this case Jamie seems to have removed excess fuel, or some other behind the scenes change with the injector operation that resolved it. my VE's and AFR are actually set much leaner than before.
Gotcha. Weird it only showed up after running the tt MAP.
Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
A little racer trick regarding chasing down detonation/noise. Get tank of better (about 5 points higher) gas than you are running now. If the detonation in the logs gets better, you are chasing real detonation. If there is no change in recorded detonation, most likely you are chasing some other issue.
Hope this helps
Andy
Hope this helps
Andy
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Advanced
Joined: Jan 2014
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From: tn
I have read and read and read some more on this thread and the info is endless. But what i cannot find is regarding tuning my timing. I Dont have many if any knock events so I wanted to push my timing until I started to get minor knock events and back it off a hair. The best way I can find to do this is through log tuner, There is just one problem. I cant find a download for the log tuner anywhere. Did DJ stop the log tuner download when the autotune basic launched or am I missing something. Just looking for the log tuner software to load my data logs into to help me make heads or tails of my logs.