I have also noticed that if you go WOT and then suddenly come off WOT (rapidly slowing down) you get what I guess is Lift Off Detonation whereby the car just drops from high load to low and from low timing to high. I think I read on here that that change is what causes the detonation no? Is there anyway to get rid of this completely? Or is this just something you have to live with?

 

Bump for answer to the "lift of detonation" question. Also another question about AFR.

So the AFR range I am trying to hit is first 11.0-11.3 and then I will try 11.0-11.5 after that. My question is for spool up should the AFR be on the lower end of the range (i.e 11.0) or on the higher (i.e 11.3)? From most maps posted here I would imagine it looks like AFRs are richer during spool up and then lean out up top.

And then at high RPMs do you just lean the AFR back out to the higher end of the targeted range (11.3)?

I did rescale my maps now to go to 280 (max load I see is 295 but baby steps )

 

no, leaner during spool up. i.e. 12.5-13.0

 

Ok. I should further clarify. So what I thought was that during spool up you go a bit richer then lean it out immediately after and then gradually richen again.

So elhalisf you are saying it should be lean in spool up and then just gradually richen out as it goes to high rpm?

 

it should start out lean before you hit full boost, gradually dropping down before you hit full boost, then eventually flat line during full boost

 

Ah ok I see

 

that's almost as bad as sayin' it straight up haha

 

I wouldn't get too caught up in trying to adjust your timing to values that are "known to work". Each car is unique and may or may not work with a certain amount of timing. Personally I would have started with a stock timing map and worked my way up, instead of attempting to fix a modded map.

l8r)

 

yeah, good to do the least timing for max power thing.

i don't know why people don't consider that cam angle sensors aren't all created equal and that any given ecu may not read them as fast or they're not all calibrated the same so while a certain NUMBEr may correspond to an ideal timing value... that number can be shifted in any number of directions and will likely just mimick an overlyall similar CURVE but raised or lowered

 

yes, the ECU does smooth out the values between the cells. it is always interpolating between 4 cells in a block.

lets say you have a table like this:



rpm 240load 260load 280load 300load
3000 7 6 5 4
3500 7 6 5 4
4000 8 7 6 5
4500 15 14 13 12




now lets say your at WOT at 3750rpm, and have a load of 290. you will see that the 4 closest cells are 5,4, 6, 5 which timing advance would you have? the answer is all 4. it will take the timing and interpolate between all 4. sense it is exactly between the load columns, you would see around 4.5 to 5.5 deg timing advance, and sense it is between the 3500 and 4000 rpm, you would expect halfway between 4.5 and 5.5, so around 5degrees is what the actual timing value would be. the closer you are to a column, the more that value effects the actual value. so if you were at EXACTLY 4000 rpm and 300 load, you would see 5degrees timing because the 3 other closest cells would have no effect on the interpolation (even though, in the ecu code it would still calculate the timing advance using 4interpolation methods.

this is the reason you never want to "spot" tune. by this i mean, looking at the data logs, and adjusting one cell at a time. you will never achieve anything doing this method, unless you map is already highly refined and only needs one small adjustment. you should always be looking at the patterns, and smoothness of the path your car will take at WOT (or whatever load you are trying to tune at). you will see at WOT that large skips in timing from one cell to another can cause knock, even though that timing isn't to drastic. simply making the timing transitions smoother can eliminate the knock yet still allow a good amount of timing advance. knowing that the ecu is never looking at just one cell in the table at a time, will make you think twice about adjusting your tables one cell at a time.

hope that helps.

 

Yes I know that and thats why while I am taking feedback I am also slowly moving the numbers around myself and seeing how they affect the car. I just was curious to see what other people thought of it so far.


And I like to learn thats why i started with the modded map. I actually did a diff on it and the stock 05 rom to begin with. Funnily enough the lower part of the fuel map was an exact match for a stock 03 rom....

 

Here is the latest version of the High Octane Ignition Map. Here's what I have done with the rom since last time I posted here:

Rescaled for 280 load
Lowered Boost Limit to be 300 from 319
Increased Boost Control Load Offset to be 100
Turned back on turbo boost correction (mainly in the negative direction but also at 17.5 and 19.8 in the positive direction)
Added the mods for 2 byte load (turned on) and lean spool (turned off for now)

"Borrowed" those "7s" in the top left from Naji .