No boost

Johnny91 · Post by **Johnny91** » 25 Feb 2019, 23:39

RickHaleParker would you happen to be able to tell how much that pn 1389705 costs?

Post by **RickHaleParker** » 26 Feb 2019, 02:14

Johnny91 wrote: ↑25 Feb 2019, 23:39 RickHaleParker would you happen to be able to tell how much that pn 1389705 costs?

Looks like ~$300 - $320 if you can find somebody that actually has one in stock and not just listed.

Complete turbo for $595.00.

If you just want to keep it going, you could try Pick Your Parts yards. Around here Turbo Charger Pump / Superchargers ~$65.00. You just got to be patience watch their inventory then jump when the right car comes in.

tardcart · Post by **tardcart** » 26 Feb 2019, 19:51

No, not a boost leak, I think, like you stated, your Compressor Bypass Valve has a leaking diaphragm, so that your boost pressure traveling on the 5mm line from your intake to the CBV is not aiding the spring in keeping the CBV closed so its opening at spring pressure, maybe 5lbs. I was thinking it would be easier than finding your CBV to change the compressor housing for a newer one that uses the cheaper CBV, as found on gt 3000, Volvo 940 etc. The compressor housing is just held on by a v ring but I haven't actually verified the earlier housings and the later fit. If you just want to drive and don't care about boost you can plug the line so you are not loosing vacuum and still have 5 lbs boost and protection from overboots from the spring. If you want the extra 3 labs boost you have to
fix the diaphragm. Ignoring it is fine too. small idle effect from leaking vacuum.

Johnny91 · Post by **Johnny91** » 27 Feb 2019, 21:58

Aah thank you tardcart! I didnt even realize that that was a vacuum leak im smacking my forehead. Ill just plug it for now because this is my daily. I woukd like to switch to the 850's turbo though Ive heard its nice on a 7. Thats a project for the future and if I put a different turbo in you will be hearing about it!

Johnny91 · Post by **Johnny91** » 27 Feb 2019, 22:02

RHP that is steep!! Im gonna plug the line and watch for a different turbo at the yards. Ill post updates to this thread but idk when haaaha. Thank you.

Post by **RickHaleParker** » 27 Feb 2019, 22:25

Johnny91 wrote: ↑27 Feb 2019, 22:02 Im gonna plug the line and watch for a different turbo at the yards.

Watch for:
1988 - 1990 Volvo 240
1985 - 1989 Volvo 740
1985 - 1990 Volvo 760
1989 - 1989 Volvo 780

Johnny91 · Post by **Johnny91** » 17 Mar 2019, 09:09

Man I am smackin my head on this guys try not to get too mad at me...i got access to a smoke machine and replaced a rotten vacuum hose and boost has returned. I'm still getting the block of plate and a remote valve.

Post by **RickHaleParker** » 17 Mar 2019, 10:39

Did you take advantage of the machine and check your Evap lines also?

No boost

Re: No boost