All, when tuning part-throttle, is the ideal AFR the same as tuning WOT? What would be a good wideband air-fuel ratio to go for when tuning a car to be responsive and make good torque without flooring it?

For WOT, I was planning to target 12:1 during spool up, dropping down to 11:1 by the time full boost is reached. Does this sound right for WOT, and would the same apply for part-throttle? In reality, part-throttle response will play a bigger role since most of us aren't necessarily flooring it at every light.

Thanks for any tips!

That depends on how much part throttle % you are talking about. Also depends on what load & RPM. You can't just say 13:1 is fine for partial throttle, it'll be different in all ranges.

As for your WOT, you should be fine with what you are targetting. Once you adjust your WOT cells, start adjusting the surrounding cells to create a smooth transition and you should be fine with most of the part throttle.

why not just let the ecu worry about part throttle/closed loop.

Thanks SiC, that's great advice! I'll focus on WOT cells and smooth it out from there.

jmorris, for part-throttle tuning, I mean open-loop tuning. I believe the ECU will transition to open loop based on TPS and load - any one know the exact values for the switchover? The reason I'm wondering about part-throttle is because it's common to have the throttle at 50-75% when wanting to accelerate briskly without flooring it.

I haven't played too much with it, but ecuflash provides the ability to interpolate vertically and horizontally. You could use that to help your smoothing, then look it over.


Take that with a grain of salt though, this advice givers WB is still in the mail ;-)

Thanks SiC, that's great advice! I'll focus on WOT cells and smooth it out from there.

jmorris, for part-throttle tuning, I mean open-loop tuning. I believe the ECU will transition to open loop based on TPS and load - any one know the exact values for the switchover? The reason I'm wondering about part-throttle is because it's common to have the throttle at 50-75% when wanting to accelerate briskly without flooring it.

actually the ECU transitions to openloop very early ..

unless you're using EBC.. you really don't have to worry too much about part throttle boost..

think like the car :rock:

it doesn't see boost or throttle..
it sees load and rpm..

so if you're 75% at 20psi and 3500rpm.. the ecu will reference loadsite 200+ for data

If you have done your WOT correctly and smoothen out the table.. its automatically taken care of..

;)

actually the ECU transitions to openloop very early ..

unless you're using EBC.. you really don't have to worry too much about part throttle boost..

think like the car :rock:

it doesn't see boost or throttle..
it sees load and rpm..

so if you're 75% at 20psi and 3500rpm.. the ecu will reference loadsite 200+ for data

If you have done your WOT correctly and smoothen out the table.. its automatically taken care of..

;)

Thanks Gunzo! So here's one more dumb question ;) How many cells should I have it smooth across? For example, if I'm tuning the cells in the 200 load range, should I smooth down towards 160 load, 100 load, or ??? Thanks :)

Thanks Gunzo! So here's one more dumb question ;) How many cells should I have it smooth across? For example, if I'm tuning the cells in the 200 load range, should I smooth down towards 160 load, 100 load, or ??? Thanks :)

Not a dumb question :D

I use some geeky rule I learnt in college :D .. cell in the middle .. 8 surrounding cells are changed .. ;)

so Cell + 1 and Cell -1
from there .. use the B function to smooth it out from Cell+1/-1 to stock map ..

usually you don't worry about anything below 160 ..

Once you're done .. you'll see on average 12+ AFR at part throttle on boost .. its ok ..

Not a dumb question :D

I use some geeky rule I learnt in college :D .. cell in the middle .. 8 surrounding cells are changed .. ;)

so Cell + 1 and Cell -1
from there .. use the B function to smooth it out from Cell+1/-1 to stock map ..

usually you don't worry about anything below 160 ..

Once you're done .. you'll see on average 12+ AFR at part throttle on boost .. its ok ..

Thanks, that makes sense! However, I may need a bit of clarification in ECUFlash. Here's an example - suppose cell E is the value that I changed.

A B C
D E F
G H I

If I changed cell E, I assume I should highlight starting at cell A down to cell I, and then use the B function to interpolate. However, if I do this, it changes the value of cell E (based on the surrounding cell values). Is this the correct way to do this? An example would be great :D

Thanks, that makes sense! However, I may need a bit of clarification in ECUFlash. Here's an example - suppose cell E is the value that I changed.

A B C
D E F
G H I

If I changed cell E, I assume I should highlight starting at cell A down to cell I, and then use the B function to interpolate. However, if I do this, it changes the value of cell E (based on the surrounding cell values). Is this the correct way to do this? An example would be great :D

I leave cell E alone since that is the known correct cell.. ie
I change B (up)and H(down) thru to stock mapping vertically
I change ADG and CFI thru to stock mapping horizontally (using B and H as reference)

I leave cell E alone since that is the known correct cell.. ie
I change B (up)and H(down) thru to stock mapping vertically
I change ADG and CFI thru to stock mapping horizontally (using B and H as reference)

Ah I see...makes perfect sense now....thanks! I had to think about it a bit more to realize how the interpolation will never change the two end cells, only the middle cell. So I really end up selecting 3 cells at a time (and interpolating) in order to change each of the 8 cells surrounding E.

I leave cell E alone since that is the known correct cell.. ie
I change B (up)and H(down) thru to stock mapping vertically
I change ADG and CFI thru to stock mapping horizontally (using B and H as reference)

A B C
D E F J
G H I K
L M N O


ok, so I opened ECU flash for the 1st time ever this week and have been poking around the tables comparing my stock rom to the generic GSR rom.


I understand the need for smoothing the cell changes etc..

but when you talk about changing the 8 surrounding cells wouldn't that change effect the next cell your going to adjust?

Like I'm trying to adjust E as 220 load @ 5500rpm, but then wont I be adjusting I next as 240load @ 6000rpm, and if so, since E was known and I is known do i leave E alone and smooth everything else again (well H and F and the other surrounding cells, like JKO verticaly and since E is known in the EHM vertical stack I wouldnt change E or.. umm)

yeah, its just not clicking with me yet, am I hopelessly wrong?

my wideband is here :) but I can tell I have a lot to learn still so i haven't even installed it yet.

ok, so I opened ECU flash for the 1st time ever this week and have been poking around the tables comparing my stock rom to the generic GSR rom.


I understand the need for smoothing the cell changes etc..

but when you talk about changing the 8 surrounding cells wouldn't that change effect the next cell your going to adjust?

Like I'm trying to adjust E as 220 load @ 5500rpm, but then wont I be adjusting I next as 240load @ 6000rpm, and if so, since E was known and I is known do i leave E alone and smooth everything else again (well H and F and the other surrounding cells, like JKO verticaly and since E is known in the EHM vertical stack I wouldnt change E or.. umm)

yeah, its just not clicking with me yet, am I hopelessly wrong?

my wideband is here :) but I can tell I have a lot to learn still so i haven't even installed it yet.

The sudoku method is for unknown cells ..

ABCDE
FGHIJ
KLMNO

So if the bolded cells are known .. why do you want to change it ?? :D leave it alone if you already know what goes into the cell

All this is to figure what to put in for unknown cells .. as you get more proficient in ECUFlash and your car .. you can even put a guesstimate in the cells and you won't be far wrong ;)

The sudoku method is for unknown cells ..

ABCDE
FGHIJ
KLMNO

So if the bolded cells are known .. why do you want to change it ?? :D leave it alone if you already know what goes into the cell

All this is to figure what to put in for unknown cells .. as you get more proficient in ECUFlash and your car .. you can even put a guesstimate in the cells and you won't be far wrong ;)

yeah, that makes sense I think thats what i was trying to type anyway ;) haha

thanks!

I'll post up some 90 oct logs (stock rom) as soon as evoscan is workin :) should be pretty ugly, haha the top "feels" weak so I'm sure all kinds of timing is being pulled.