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Old 07-20-2006, 11:33 AM   #1
Tea cups
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Default Interesting details about Cobb's maps

Been messing around with the Accessport and Streettuner (02 WRX) and reading all the current maps via Ecuflash to check them out. I like to get an idea of how different tuners approach their "craft" as it seems they all like to do things differently (and no, I won't send you a copy of any of these roms or screenshots so don't ask):

Stg 2 91 verses Stg 2 93:
Identical except for base ignition timing and low detonation fueling. Most of the largest advances to timing are in the higher load/rpm sites, although there is some additional timing at low to mid rpm and up to medium load. As far as fuel, it is slightly (almost negligibly) leaner in 6 cells at the highest rpm/load in the 93 map.

Stg 2 91 verses Stg 2 California:
Surprisingly, base and dynamic timing are identical between these two maps. In fact, everything is the same except for low detonation fuel, in which the California map is slightly richer in the last 3 load columns starting at 2000 rpm.

Fuel Economy 91 octane:
Basically a stock map with advanced timing in the low-mid rpm and low load range. Boost control is turned off (wastegate and boost values are all set to 0). Everything else, for the most part, is identical to a stock map.

VF30 91 verses VF34 91:
Very slight (negligible) reduction in wastegate duty and boost at only the highest rpm/load cell for the VF34 compared to the VF30. Other than that, they are identical.

FP16g 91 verses VF34 91:
Many significant differences - too numerous to list them all. It looks like Cobb spent a lot of time on this map. Some interesting changes include the modifying of the coarse and fine ignition rpm and load ranges as well as the knock learning axis load and rpm. MAF scaling has a reduction in airflow in the mid to high 3's volts range for the 16g. Obviously, any table using load as an axis, the max load was rescaled. The 16g also has more aggressive turbo dynamics maps than the VF34. All boost, timing, fuel and wastegate maps are noticeably different when comared to the VF34.

Streettuner Stg 2 91 verses Accessport Stg 2 91:
Identical except for the dynamic advance map. The streettuner version has less advance especially in the 4800 rpm row at mid to high load (the AP stg 2 has values closer to the stock map in this area, whereas the ST map has greatly reduced timing here). The rest of the lower advance is in the mid-mid/high rpm and load ranges. There are some programming logic changes between these maps, but that might be inherent in the marrying of the ST verses the AP.
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Old 07-20-2006, 03:15 PM   #2
accna
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How much base ignition timing was changed from the Stg 2 91 verses Stg 2 93?
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Old 07-20-2006, 03:39 PM   #3
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Wow, this is interesting. I really wish I could see how Cobb tuned the 16G. I wish ST could at least open maps from other cars so we can see how everyone is tuning. I'm kind of screwed because there aren't that many FXT guys running ST.
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Old 07-20-2006, 03:42 PM   #4
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very nice...
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Old 07-20-2006, 05:23 PM   #5
Tea cups
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Quote:
Originally Posted by accna
How much base ignition timing was changed from the Stg 2 91 verses Stg 2 93?
From 3/4ths of degree to almost 2 degrees after a load of 3.48 and 4000 rpm. In the midrange/midload area, a little over a 1/4th of a degree added and about 3/4ths of a degree added at midrpm/low load. There are various other additions with individual cells, but this is the bulk of it.

Last edited by Tea cups; 07-20-2006 at 05:31 PM.
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Old 07-20-2006, 07:10 PM   #6
parker/slc/gc8fan
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Dirty, not nice.
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Old 07-21-2006, 10:14 AM   #7
Tea cups
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As far as FP16G verses VF34 boost we have (WOT):

FP16G:
rpm/boost(psi)
4800/17.58
5200/17.58
5600/16.66
6800/14.96

VF34:
rpm/boost(psi)
4800/17.28
5200/17.28
5600/16.66
6800/14.04

What's interesting is that the 16g map targets less boost at part throttle (~7 psi at 50% verses ~10psi for VF34, 10 vs 12 at 63%, 13 vs 14 at 76%, 15 vs. 17 at 88%).
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