OpenFlash Tuning Tutorial: Crawford Billet Power Block Mapping changes

[Walla Walla]

Originally Posted by Silver Ignition

can you guys tell me if I'm in the right area here…

should I be pulling those 20.62's back to 18.16 or the other 18.87?

you're at the right spot, but not on the right map

i've edited Base Timing B, you will see the timing is higher on the other map!

[Silver Ignition]

Originally Posted by Malt

Just use the 91 octane maps and try some logs. The only difference between the 93 and the 91 is the timing is 1.05 degree higher on the 93 maps above 6k like @Kodename47 pointed out. Far simpler and less chance for you to accidentally mess something up unintentionally.

yeah, I'm with you there! Uploading it now…I'll flash it in the AM and drive to work, then do a log on the way home…still on the same tank of gas too so we'll at least have some constant

Originally Posted by Walla Walla

you're at the right spot, but not on the right map

i've edited Base Timing B, you will see the timing is higher on the other map!

okay cool…worst case scenario I can play with this a little…my aim is to have less of a "peak" in that problem area?

[Grip Ronin]

so what exactly does timing compensation per cylinder do?

[Walla Walla]

Originally Posted by Grip Ronin

so what exactly does timing compensation per cylinder do?

yeah, what he said! still curious

[steve99]

Originally Posted by Grip Ronin

so what exactly does timing compensation per cylinder do?

AFAIK per cylinder compensation is due to some cylinders being more knock prone than others so it allows you to adjust timing on a per cylinder basis,

[steve99]

Originally Posted by Silver Ignition

yeah that's a really weird spike…that's right in the wheelhouse where this thread is aimed too…6200-6700

as suggested by others its easiest just to run 91 tune , just timing top end pulled over 93 tune

[zdr93523]

I downloaded RomRaider, loaded the RR_ZA1JA01C definition that I downloaded from the OFT site, opened the A01C 91 octane bin file, and when I open the tables in the instructions, the tables are incorrect. I get RPM down the left side, and a bunch of gibberish numbers across the top of the table (Timing Compensation per Cylinder tables).

RomRaider gave me a bunch of corrupt data mismatch errors:
Checksum No 1 invalid
P0300
P0355
P0604

WTF am I doing wrong?

Shiv, please send me a 2.01 91 octane A01C BPB modified map or if someone has one, please upload it.

[Walla Walla]

Originally Posted by zdr93523

I downloaded RomRaider, loaded the RR_ZA1JA01C definition that I downloaded from the OFT site, opened the A01C 91 octane bin file, and when I open the tables in the instructions, the tables are incorrect. I get RPM down the left side, and a bunch of gibberish numbers across the top of the table (Timing Compensation per Cylinder tables).

RomRaider gave me a bunch of corrupt data mismatch errors:
Checksum No 1 invalid
P0300
P0355
P0604

WTF am I doing wrong?

Shiv, please send me a 2.01 91 octane A01C BPB modified map or if someone has one, please upload it.

did you download the 2.01 package, with the tune and XML also inside? and did you load the right XML in romraider?

[zdr93523]

Originally Posted by Walla Walla

did you download the 2.01 package, with the tune and XML also inside? and did you load the right XML in romraider?

Where's the link to the 2.01... I can't find it.

[zdr93523]

Originally Posted by zdr93523

Where's the link to the 2.01... I can't find it.

Disregard, I found it. No help with the search function as "2.01" can't be found.

[zdr93523]

Quick review: This map is definitely smoother than the previous 1.59 tune. It does feel like there's more power up top.

[steve99]

Originally Posted by zdr93523

I downloaded RomRaider, loaded the RR_ZA1JA01C definition that I downloaded from the OFT site, opened the A01C 91 octane bin file, and when I open the tables in the instructions, the tables are incorrect. I get RPM down the left side, and a bunch of gibberish numbers across the top of the table (Timing Compensation per Cylinder tables).

RomRaider gave me a bunch of corrupt data mismatch errors:
Checksum No 1 invalid
P0300
P0355
P0604

WTF am I doing wrong?

Shiv, please send me a 2.01 91 octane A01C BPB modified map or if someone has one, please upload it.

Clean out your old defs from RR or at least make sure the def you want is firt on list under manage definitions. Make sure you have correct defs the v201 and v202 are different one is BO1C based and other is D00 based the old 1.5 x tunes were the A01 based tunes, i think thats your problem the tunes are not always based on you calid.

[Kodename47]

Originally Posted by Grip Ronin

so what exactly does timing compensation per cylinder do?

What the per cylinder timing compensation does is allow for different ignition timing for different cylinders. In our case on a standard map, it retards timing in cylinders A and B, which I'm pretty sure are the rear 2 cylinders, but I'm not 100%.


As to why, there is plenty of speculation out there but I guess that no-one bar Subaru/Toyota actually know. From my reading the possible list is (and may not necessarily be just one of below):
Knock Sensor Location if only 1 sensor - So that the cylinders closest to the sensor are the ones that will knock 1st, knock detection is easier.
Heat - Maybe the cooling (oil &/or water) systems are more efficient in some cylinder than others, making some more knock prone
Manifold Design - Both intake and exhaust, possible flow differential between cylinders require a change in the timing


There's a good long debate on RomRaider and there is no defined answer. There's definitely signs that on older STi's, cylinder 4 was more advanced (ie positive values in the PCC) than the rest and was more often the 1st cylinder to go. Others have 2 cylinders more advanced, and that is usually 2 and 4 (same bank).


Now, I don't know where the knock sensor is on the FA20 so I don't know if cylinders 1 and 2 being retarded is for the same thing, as that would mean the knock sensor is on the front of the block - assuming the layout is:
R
1 2
3 4
F


This is why I asked Shiv why he thinks this is a good idea. It seems (from other reports) that the car will run better with the compensations zero'd out, so I don't see why you couldn't/wouldn't do this on any tune but 1st of all I'd like to be sure why it's there in the 1st place as it could protect the longevity of your engine. If it is knock related, I would be looking to have a completely knock free tune before you change the PCC.

[Silver Ignition]

Originally Posted by steve99

as suggested by others its easiest just to run 91 tune , just timing top end pulled over 93 tune

I flashed to the 91 tune this morning and drove to work...I'll do a pull on the way home and post