1996 855 T5 - Musings on Wastegate Adjustment

Post by **abscate** » 22 Aug 2017, 16:15

Trying to remember this. If I recall boost is applied by the TCV allowing pressure to be sent to the wastegAte, which keeps it closed.

The 3.5 psi measurement is a calibration pressure applied to the wastegAte which is then set to the closed position following the procedure given in VIDA. Shortening -the rod will mean the wastegAte but opens later

Uh oh, what do I have wrong here ?

Post by **hausmeister** » 23 Aug 2017, 08:27

On the 850s the tcv opens the wastegate by applying pressure.

I recently played with my setup again. Relocated the tcv nearer to the turbo and shortened the hoses a lot. Since then i was able to increase the pretension again and also the boost build up is smoother since the tcv seems to be able to regulate better.

Post by **abscate** » 08 Apr 2018, 06:51

Reviving old topic

Here is the picture of my discontent

: 7CD81C68-8752-4D11-B428-AAC95D55E80F.jpeg (116.62 KiB) Viewed 1911 times

Yet people report enhanced Or earlier boosting when shortening the wastegate rod.

Post by **hausmeister** » 09 Apr 2018, 07:36

that should explain it

Post by **abscate** » 09 Apr 2018, 08:29

Ha!!

Dumba$$ moment.

Im watching this thinking I know all this already - then realize my mistake - really simple one.

WASTEGATE CLOSED = maximum boost

WASTEGATE OPEN = no boost.

So, as the spring and diaphragm age, the Wastegate Adjuster has less tension to close the waste gate, and it stays open and reduces boost. Shortening the rod compensates for the weakness and closes the waste gate like new.

Post by **abscate** » 09 Apr 2018, 08:37

Awarded this 9 April in the year of our Swede 2018

: Screen Shot 2018-04-09 at 10.36.24 AM.png (1.13 MiB) Viewed 1856 times

Post by **wizechatmgr** » 10 Apr 2018, 07:40

It could have been worse... You could be the broke guy that makes sure everyone on government assistance gets their benefits - on time even.