ecu swap - boost problems

Brett Dikeman brett at
Thu Jun 13 18:19:10 EDT 2002

At 11:50 PM -0400 6/12/02, Dan Simoes wrote:
>Tried swapping my ECU for Brett's IA III+.  The boost problem remained
>in my car.  I guess that's good though, as I'd hate to have to buy a new

To clarify, he was getting 20 PSI normally, with sharp cutbacks to 7psi.

Via the gauge I've borrowed from Dan, my long-standing suspicions
have been confirmed; I'm not getting full boost myself...but the
behavior is different.

1st gear gets me about 5psi or so, maybe a little more(too much
happening in 1st full throttle to pay too much attention :-); 2nd
gets a little more, I think 10 but I can't remember.

3rd, 4th and 5th get anything from 15 to about maybe 18psi.

Same ECU swapped into Dan's car hit 20, but bounced back to 7.

Glen, in a post to the archives, says he's seen 24(!) psi under heavy
load, 21 in normal conditions.

My current suspect is the control line for the bypass valve; this
weekend will be replace-the-vacuum-lines-weekend, since I also have a
leak at the exit side of the moisture trap...which may or may not be
contributing to the 10psi vacuum reading...same vacuum at idle,
coasting w/foot off gas, etc.

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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