CA18DE turbo issue

Tuning concepts, methods, tips etc.

Moderators: jsmcortina, muythaibxr

Post Reply
jasaircraft
Super MS/Extra'er
Posts: 902
Joined: Mon Jul 07, 2008 5:45 pm

CA18DE turbo issue

Post by jasaircraft »

Hi,
My problem atm with my ca18de engine that is turbo (yes high CR) is that for some reason third gear does some funky stuff to my AFRs while at WOT (erratic similar to missfire).
Hitting the same cells on 2nd gear doesnt.
While listening to my stethoscope connected to a hose connected to a copper to the block to a good place, you can hear a difference between 2nd and 3rd gear pulls, it sounds as if it was either det or some valvetrain issue.
Im using avgas at the moment(100oct) just to tune my two boost controll maps (around 8psi for map1 and 14psi formap2)

I pulled out the plugs to see if there where some signs of det but dont see any black spots or shinny spots or metal on the porcelain. plugs are gapped 0.75mm
I also checked fuel pressure while on the run and seems to be the same on both runs.
maybe im having a timing issue with the stock cas sensor or some sort of flutter of pressure inside the intake manifold...

Got my datalog that shows both conditions im uploading together with my msq
jasaircraft
Super MS/Extra'er
Posts: 902
Joined: Mon Jul 07, 2008 5:45 pm

Re: CA18DE turbo issue

Post by jasaircraft »

solved the problem was a leaking o ring on cyl4
Post Reply