Turbo flanges - Could someone clear things up?

mikkey850 · Oct 13th, 2014, 16:40

Hello everyone,

My turbo has about bit the dust and is blowing a lot of oil into my intercooler and throttle body, so I am looking to replace it.

I happen to have a 1997 Volvo S70 2.5T with a dead auto gearbox but a good engine/turbo.

Would I be able to swap the turbo out of my S70 in to my 940?

I beleive the turbo in the S70 is a 15g and the turbo in the 940 is a 13g.

I have heard people saying that only the early 850 T5 15g's bolt straight on to the 940 exhaust due to them being conically flanged or something. I am a little stuck here.

Does this mean that it is just the connection between the turbo and exhaust is different? And that I could weld the exhaust flange from the S70 onto the 940 downpipe and it would work?

Also is the connection type in the newer turbo layouts stronger as my 940 seems to have continous exhaust leaks between the turbo and the exhaust

Sorry if I have asked some stupid questions and worded things badly. I am just not 100% sure where I sit with this.

Thanks,

Michael.

barkster1971 · Oct 13th, 2014, 17:10

You can use your 15g, it will probably have a flat flange so you'll need to saw off that first inch of your s70 downpipe. Then reclock the 15g and stick it on mated to the s70 downpipe flange you've welded onto your 940 downpipe.

mikkey850 · Oct 13th, 2014, 18:22

Thank you Barkster, that is EXACTLY the answer I needed!

Will the 15g offer any potential (With better fuelling etc) performance gains?

I suppose having a downpipe with a flat flange would be advantageous as that type of turbo seem easier to find these days if I wanted to upgrade at a later date.

Thanks again!

Michael.

barkster1971 · Oct 13th, 2014, 20:33

If you fit the 15g and then fit a manual boost controller ( with a boost gauge ) you gain an easy 50 bhp over stock if you run 10-12 psi. The car will be a lot quicker. Is it a b230fk engine or b230ft?

mikkey850 · Oct 14th, 2014, 08:25

Hello bakster,

I believe I have the B230FT (HPT).

50bhp is quite a large increase. Would I need to alter the fuelling?

Thanks.

Michael.

barkster1971 · Oct 14th, 2014, 18:52

The ft should see about 30 bhp increase if you run at 10-12 bhp. Fueling will be fine. Go any higher and the ecu will be guessing a bit too much. Mine's about double what it started with once I stop it burning oil!

Oct 13th, 2014, 16:40	#1
mikkey850 Member Last Online: Aug 21st, 2015 13:04 Join Date: Dec 2013 Location: York	Turbo flanges - Could someone clear things up? Hello everyone, My turbo has about bit the dust and is blowing a lot of oil into my intercooler and throttle body, so I am looking to replace it. I happen to have a 1997 Volvo S70 2.5T with a dead auto gearbox but a good engine/turbo. Would I be able to swap the turbo out of my S70 in to my 940? I beleive the turbo in the S70 is a 15g and the turbo in the 940 is a 13g. I have heard people saying that only the early 850 T5 15g's bolt straight on to the 940 exhaust due to them being conically flanged or something. I am a little stuck here. Does this mean that it is just the connection between the turbo and exhaust is different? And that I could weld the exhaust flange from the S70 onto the 940 downpipe and it would work? Also is the connection type in the newer turbo layouts stronger as my 940 seems to have continous exhaust leaks between the turbo and the exhaust Sorry if I have asked some stupid questions and worded things badly. I am just not 100% sure where I sit with this. Thanks, Michael.

Oct 13th, 2014, 17:10	#2
barkster1971 VOC Member Last Online: Today 13:22 Join Date: Jun 2009 Location: Swineshead/Salford	flat You can use your 15g, it will probably have a flat flange so you'll need to saw off that first inch of your s70 downpipe. Then reclock the 15g and stick it on mated to the s70 downpipe flange you've welded onto your 940 downpipe. __________________ new engine! new car!

Oct 13th, 2014, 20:33	#4
barkster1971 VOC Member Last Online: Today 13:22 Join Date: Jun 2009 Location: Swineshead/Salford	bigger If you fit the 15g and then fit a manual boost controller ( with a boost gauge ) you gain an easy 50 bhp over stock if you run 10-12 psi. The car will be a lot quicker. Is it a b230fk engine or b230ft? __________________ new engine! new car!

Oct 14th, 2014, 18:52	#6
barkster1971 VOC Member Last Online: Today 13:22 Join Date: Jun 2009 Location: Swineshead/Salford	power The ft should see about 30 bhp increase if you run at 10-12 bhp. Fueling will be fine. Go any higher and the ecu will be guessing a bit too much. Mine's about double what it started with once I stop it burning oil! __________________ new engine! new car!

Oct 13th, 2014, 18:22	#3
mikkey850 Member Last Online: Aug 21st, 2015 13:04 Join Date: Dec 2013 Location: York	Thank you Barkster, that is EXACTLY the answer I needed! Will the 15g offer any potential (With better fuelling etc) performance gains? I suppose having a downpipe with a flat flange would be advantageous as that type of turbo seem easier to find these days if I wanted to upgrade at a later date. Thanks again! Michael.

Oct 14th, 2014, 08:25	#5
mikkey850 Member Last Online: Aug 21st, 2015 13:04 Join Date: Dec 2013 Location: York	Hello bakster, I believe I have the B230FT (HPT). 50bhp is quite a large increase. Would I need to alter the fuelling? Thanks. Michael.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)