LPT - how to raise turbo boost ??

volvoid · Jan 15th, 2018, 19:08

I'm sure its in here somewhere but I cant find it.
Actuator spring ? what where how ??
etc.

gpl1968 · Jan 15th, 2018, 19:29

Fit a manual boost controller.
There is a small hose between the coldside of the turbo and the wastegate actuator. the manual boost controller splices into that pipe.
You will also need a decent calibrated boost gauge so that you can see what the turbo is doing and you can set the boost at a safe level (under 15psi).
This all assumes that the engine, gearbox, brakes etc. are in good condition before you start.

Jebus · Jan 15th, 2018, 19:48

pretty much sums it up in one ^^^

volvo always · Jan 15th, 2018, 20:26

Shame the pictures have gone, but a good writeup.

https://www.volvoforums.org.uk/showthread.php?t=102007

James

volvoid · Jan 15th, 2018, 22:21

Can anyone point me to the appropriate parts on evilbuy ? or elsewhere ?

aardvarkash10 · Jan 16th, 2018, 01:33

search for Manual Boost Controller or MBC.

You'll get a range of items from a few quid to omigod!

You will also need a relatively accurate boost pressure gauge. Many vacuum gauges (hand-held) for diagnositc purposes read positive pressure as well and might be a better bet than installing a spangely dash gauge

Steve940estate · Jan 16th, 2018, 09:35

If you can find one it's worth buying a new actuator rated at a higher pressure.
The cheap boost controllers off ebay fall into two types and either create an adjustable air leak to fool the actuator into thinking the turbo has created less boost or the other type which block the signal to the actuator until the pressure overcomes the adjustable ball valve.
I have found that the air bleed type valves are a bit smoother in operation.

I have a combination of the three. I fitted a new actuator, fitted a small restrictor into the feed pipe to delay the pressure signal and have a bleed valve in the car to allow some adjustability. I have also piped the bled off air back into the system to stop the mixture being affected.

If you are running standard unleaded then 12 psi is a safer place to start.

Rversteeg · Jan 16th, 2018, 12:53

Quote:

Originally Posted by volvo always

Shame the pictures have gone, but a good writeup.

https://www.volvoforums.org.uk/showthread.php?t=102007

James

This brought back the pictures for me. https://www.volvoforums.org.uk/showthread.php?t=277107
Great description of how to install an MBC, by the way. In reality it is actually easier installed than described how to do it!

rogerthechorister · Jan 23rd, 2018, 18:54

Nick a knackered turbo off an HPT. They have a different length actuator arm and it's adjustable too. Swap the actuator arm. Adjust to taste.

Steve940estate · Jan 24th, 2018, 22:04

Quote:

Originally Posted by rogerthechorister

Nick a knackered turbo off an HPT. They have a different length actuator arm and it's adjustable too. Swap the actuator arm. Adjust to taste.

I think that was the case for the early 940 as they had the Garrett turbo fitted. Most of the later Mitsubishi ones had fixed arms on them. You can put a few washers between the mounting bracket and Turbo and it the same thing. You can buy these off ebay though.

https://www.ebay.co.uk/itm/Turbo-Act...-/262839808309

Jan 15th, 2018, 19:08	#1
volvoid Monster Raving Loony Last Online: Nov 12th, 2018 20:03 Join Date: Oct 2013 Location: hitchin	LPT - how to raise turbo boost ?? I'm sure its in here somewhere but I cant find it. Actuator spring ? what where how ?? etc. __________________ 1994 850 2.0 bought at 32,000 miles used daily now 45,000. Still like a nearly-new car 2004 filthy polluting diesel VW

Jan 15th, 2018, 19:29	#2
gpl1968 VOC Member Last Online: Apr 14th, 2024 16:45 Join Date: Jun 2007 Location: Wirral View Photos By: gpl1968	Fit a manual boost controller. There is a small hose between the coldside of the turbo and the wastegate actuator. the manual boost controller splices into that pipe. You will also need a decent calibrated boost gauge so that you can see what the turbo is doing and you can set the boost at a safe level (under 15psi). This all assumes that the engine, gearbox, brakes etc. are in good condition before you start. __________________ Gavin 1997 945 CD (B230FK) [RIP: 1991 945 Turbo (B230FT) 1992 945 SE turbo (B200FT)]

Jan 15th, 2018, 19:48	#3
Jebus VOC Member Last Online: Aug 13th, 2023 17:49 Join Date: Aug 2016 Location: Aberdeen	pretty much sums it up in one ^^^ __________________ 1992 2.0 SE Turbo Wentworth, now with b230ft & M90 2005 S60 2.0T the baby T5

Jan 15th, 2018, 22:21	#5
volvoid Monster Raving Loony Last Online: Nov 12th, 2018 20:03 Join Date: Oct 2013 Location: hitchin	Can anyone point me to the appropriate parts on evilbuy ? or elsewhere ? __________________ 1994 850 2.0 bought at 32,000 miles used daily now 45,000. Still like a nearly-new car 2004 filthy polluting diesel VW

Jan 23rd, 2018, 18:54	#9
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Or???? Nick a knackered turbo off an HPT. They have a different length actuator arm and it's adjustable too. Swap the actuator arm. Adjust to taste. __________________ B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold.

Jan 15th, 2018, 20:26	#4
volvo always Premier Member Last Online: Today 11:05 Join Date: Dec 2010 Location: Midlands.	Shame the pictures have gone, but a good writeup. https://www.volvoforums.org.uk/showthread.php?t=102007 James

Jan 16th, 2018, 01:33	#6
aardvarkash10 Master Member Last Online: Oct 8th, 2022 22:22 Join Date: Sep 2016 Location: Auckland	search for Manual Boost Controller or MBC. You'll get a range of items from a few quid to omigod! You will also need a relatively accurate boost pressure gauge. Many vacuum gauges (hand-held) for diagnositc purposes read positive pressure as well and might be a better bet than installing a spangely dash gauge

Jan 16th, 2018, 09:35	#7
Steve940estate Steam Driven PC Owner. Last Online: Mar 4th, 2024 23:50 Join Date: Dec 2004 Location: Not sure.	If you can find one it's worth buying a new actuator rated at a higher pressure. The cheap boost controllers off ebay fall into two types and either create an adjustable air leak to fool the actuator into thinking the turbo has created less boost or the other type which block the signal to the actuator until the pressure overcomes the adjustable ball valve. I have found that the air bleed type valves are a bit smoother in operation. I have a combination of the three. I fitted a new actuator, fitted a small restrictor into the feed pipe to delay the pressure signal and have a bleed valve in the car to allow some adjustability. I have also piped the bled off air back into the system to stop the mixture being affected. If you are running standard unleaded then 12 psi is a safer place to start.

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