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Old 02-12-2009, 06:04 PM   #1
2slow
Scooby Newbie
 
Member#: 158479
Join Date: Sep 2007
Location: Michigan
Vehicle:
2005 Saab 9-2x Aero

Default Differences between Cobb Stage 2 maps for 91, 91 and ACN 93

I have a Saab 9-2x Aero that has a Cobb catted downpipe, catless up pipe from a ’06 STI and a cat back exhaust from the same ’06 STI. The STI exhaust technically does not meet the requirements of a 3” cat back for stage 2, but lots of people claim to run them with Stage 2 and have had no problems. I also saw a post in NASIOC that showed it had pretty low backpressure levels. I just do not want a loud exhaust and I have a buddy with the Borla Hush system and it is louder than I can tolerate.

My reasons for modifying the car were primarily to improve the low RPM performance. I don’t mind the higher RPM bonus, but I tend to short shift and will rarely use it.

I would like to have the best low end performance possible, and am willing to take a little reduction in high RPM performance in exchange for an increase in reliability. (This is especially important to me considering the fact that the STI exhaust is a little outside the parameters endorsed by Cobb for Stage 2.)

I took a look through the three Cobb Stage 2 tunings in access tuner race and found:

Stage 2 91 octane and Stage 2 91 ACN appear to be identical except for the primary fuel tables being about 0.01 richer in the higher load areas.

Stage 2 91 octane and Stage 2 93 octane appear to be identical except for some small differences in the primary spark tables.

OK, here is my idea:

I loaded the Stage 2 91 octane map into access tuner race and bumped the primary ignition timing to the same values as the 93 octane map for RPM below 4,000. I also richend up the primary fuel tables to the same levels as the 91 ACN for RPM over 4,000 RPM. I also reduced the rev limiter back to the stock 7,100 RPM.

I think that if I do that, I would essentially be running the 93 octane map below 4,000 RPM and the 91 ACN map above 4,000 RPM with a stock rev limiter

Does the above sound OK? Are there differences between the maps that I did not find?

Thanks in advance,
-Joe

Stage 2 91 Octane ACN

Stage 2 91 Octane

Stage 2 93 Octane
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