Quote:
Originally Posted by automan25
Gratuitous,
Did you notice another improvement in performance when you replaced the lower DISA valve? Also, can you provide a link to the videos you mention. Thanks.
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My friend needed both DISAs replaced, I only needed the small/lower one and there's a dyno graph over at E90post showing what the power looks like with broken DISAs.
Based on how my car changed after replacing the small one, and how my friend's car changed changing both, I think the big DISA affects the 3-5k RPM range and the small DISA is lower end.
When I replaced my small DISA my partial throttle and low speed driving was a fair bit smoother, but I didn't feel I gained much if any power.