Originally Posted by gatorfast
Got the 231E update for my car a few weeks ago. Can't say there was a noticeable difference in performance (had the factory programming on my 08 before). One thing though is the cold start seems to be a little more rough now than it was before.
I noticed that too. Mine doesn't rev quite as high (maybe 1200 instead of 1500) and it "lopey" like it has a big cam lol! Also, I thought that my ICV was going bad (revs going up and down during cold starts) and that is virtually gone now.
As far as not being able to FEEL a difference in performance, that's not terribly surprising to me. The "butt dyno" is gonna have a hard time detecting a 3-5% change in power. We are talking about 10-20 HP here compared to 400+. That's "in the noise" for the butt dyno IMO.