Originally Posted by
Lenin
I started experiencing the same kind of surge lately when it got colder. Similar to the old EC tune when shifting from 3rd to 4th. Like as if I let the gas pedal go.
To the OP, same recommendation as others. Stick with the Code3 pulley. If you have some extra $$, get an LSD.
Originally Posted by
oledoc2u
That can mean a lien condition....I'd be careful with that. The cool temps give this car some good air, and not always enough fuel to go with it. You might think about an upgrade in fuel delivery....
I was referring to closed loop, so you could say it was due to a "Lean" condition since the car has a 14.7 Air/Fuel ratio at the time with big boost and lots of timing. The car throws even more timing at in cold weather due to the low air temps.
Chris (LateModel21) is experiencing the same surge with just a 62mm pulley, but he only gets 91 octane out west. I believe he said it does if more frequently when the car is cool (recently started). That also makes me think it's detonation, since the car has the coolest air temps at start-up and therefore sees the most aggressive timing.
Lots of timing, lots of boost, and low octane fuel in closed-loop seems to cause the windshield face-plant.
I guess it's even worse with 91 octane, since it has a lower flashpoint than 93.