No boost

Johnny91 · Post by **Johnny91** » 21 Feb 2019, 23:36

Soo I noticed the other day a lack of power and my boost gauge needle only goes about a quarter inch into the yellow now whereas before it would go into the middle. I checked the valve that bolts onto the turbo and it doesn't hold pressure- not even the pressure you would use to blow bubbles with. Could that have something to do with the lack of power?? I hope not because there doesnt seem to be a replacement available for such a part unless you buy it with a slightly more expensive turbocharger attached to it.

where do the people who sell remanned turbos get them?

Am i supposed to be asking these questions?

tardcart · Post by **tardcart** » 22 Feb 2019, 11:59

You need a bypass valve diaphragm for the td03 or 4. If you look around you cn find one cheaper (not from volvo) bit IPDs is 25 plus ship. rumored to rot after 3 years.
https://www.ipdusa.com/products/11813/1 ... pass-valve

Johnny91 · Post by **Johnny91** » 22 Feb 2019, 20:48

I dont think my valve can be disassembled. When you take it off its sort of a piston that slides into the turbo but it looks like I would have to do some cutting to open it.

tardcart · Post by **tardcart** » 23 Feb 2019, 06:24

oh, sorry I thought it was the Mitsubishi.

Johnny91 · Post by **Johnny91** » 23 Feb 2019, 21:52

Naw you showed me a valve that I haven't seen. It is a Mitsubishi it's just that theres at least 3 Mitsubishi models

Post by **RickHaleParker** » 23 Feb 2019, 23:40

Looks like there where 5 different turbochargers for the 1989 740 with a B230FT. Two Garret and three Mitsubishi. Which one do you have?

These are all Full HD pictures, click on them to zoom in. The part number of the turbo you are viewing shows in red.

tardcart · Post by **tardcart** » 24 Feb 2019, 07:14

great interactive diagrams. I would be thinking about swapping in another compressor housing from the newer TDO4-13 on the 940
and many others with same size turbine, or swap in a complete 15g from an 850 v70 s60 for more boost. However this might not be the only problem with your turbo, even with a leaking diaphragm the bypass spring should keep it closed for maby 5lbs boost. The seal area doesn't rip I think. You just dont have the manifold boost pressure pushing on the diaphragm helping the spring to seal the bypass.

Johnny91 · Post by **Johnny91** » 25 Feb 2019, 23:31

Mine is the 1389645. I can tell by the funny shape of the diverter valve there

Johnny91 · Post by **Johnny91** » 25 Feb 2019, 23:31

Thanks by the way that looks like a dealers diagram

Johnny91 · Post by **Johnny91** » 25 Feb 2019, 23:33

Tardcart so you suspect I have a boost leak?