Quote:
Originally Posted by geiesrp
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I live in Switzerland, around 500m above sea level. With the stock cams and the tomei 256 aswell, I always had around -0.6 vacuum @ 850rpm.
With the 258 poncam it is way down to -5.2 at idle. However idle is fine. Timing is set to -15, no leaks.
@2000 rpm I'd -7.0bar with 256poncam. with 258poncam it is now -6.8bar @2000rpm.
I do not believe in a timing issue or leak. As for now I think going back to the 256poncam, since with the 258 change I have also changed the turbo from hks gtss to GTX2860gen II, which means i'll be unable to judge the cause of the loss in low or midrange.
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I'm having as hell of a time converting values to get a feel for what everyone else is seeing vacuum wise for their cars.
-5.2 BAR is -153 Inches Mercury (which is CRAZY VACUUM compared to my -20 inches mercury)
I'm happy that I'm not the only one seeing the vacuum drop after the cam-shaft install. I'm just amazed that Tomei didn't say anything about where the car would idle at and the change in vacuum!!