Upped my boost

atnas666 · Sep 30th, 2012, 18:56

Hay Guys
Today i decided to up my boost im now peaking at about 18psi but drops back down to about 14psi.. could you enlighten me to why this could be?

Have attached two videos
video1
video 2

960kg · Sep 30th, 2012, 19:05

Quote:

Originally Posted by atnas666

Hay Guys
Today i decided to up my boost im now peaking at about 18psi but drops back down to about 14psi.. could you enlighten me to why this could be?

Have attached two videos
video1
video 2

It can depend what small boost hoses you use as they can flex or bulge and also boost depends what gear, what throttle, what revs. it all effects it.

On an auto even the brake pedal sensor effects boost.

atnas666 · Sep 30th, 2012, 19:29

Was in 4th and 5th hit about 18psi for about a sec then drops to 14ish psi (full throttle)

m1tch1987 · Sep 30th, 2012, 20:48

It could be that the recirc valve can't take the extra pressure - its not like they are new anymore, or it could be the wastegate actuator being worn meaning that the exhaust gases are pushing the wastegate open meaning that you lose boost.

Im guessing before you have upped the boost you have done all the supporting mods like cooling, ignition and fueling along with brake upgrades for the extra power?

atnas666 · Sep 30th, 2012, 21:16

Fuel,ignition and brakes are all good

Clan · Sep 30th, 2012, 21:22

Quote:

Originally Posted by atnas666

Hay Guys
Today i decided to up my boost im now peaking at about 18psi but drops back down to about 14psi.. could you enlighten me to why this could be?

Have attached two videos
video1
video 2

It depends what you did to raise the boost , remember the boost is electronicaly controlled and the ECU will always try and get it to what it should be by means of the turbo control valve ..

atnas666 · Sep 30th, 2012, 21:27

Quote:

Your looking behind the heatshield above the turbo. Beneath that, you will see a rod that runs to the wastegate, right to left. Slacken the 10mm lock nut, remove the r clip that secures the rod to the actuator, remove from the spindle and then CAREFULLY, turn the adjuster clockwise. You want to hold the arm secure otherwise you will damage the diaphragm

This is what i did.

bigyin85 · Sep 30th, 2012, 21:35

how many turns did u do mate?

atnas666 · Sep 30th, 2012, 21:38

4 turns mate. test drove after each turn...

bigyin85 · Sep 30th, 2012, 21:41

how do she feel?

Sep 30th, 2012, 18:56	#1
atnas666 Proud T4 owner Last Online: May 5th, 2021 16:04 Join Date: Oct 2011 Location: guildford	Upped my boost Hay Guys Today i decided to up my boost im now peaking at about 18psi but drops back down to about 14psi.. could you enlighten me to why this could be? Have attached two videos video1 video 2 __________________ '99 S40 T4 (Running on LPG) '97 S40 2.0CD (Sold to Completefluke) Volvo FM12 420Bhp Draw-bar - Car Transporter

Sep 30th, 2012, 19:29	#3
atnas666 Proud T4 owner Last Online: May 5th, 2021 16:04 Join Date: Oct 2011 Location: guildford	Was in 4th and 5th hit about 18psi for about a sec then drops to 14ish psi (full throttle) __________________ '99 S40 T4 (Running on LPG) '97 S40 2.0CD (Sold to Completefluke) Volvo FM12 420Bhp Draw-bar - Car Transporter

Sep 30th, 2012, 20:48	#4
m1tch1987 Premier Member Last Online: Dec 29th, 2013 12:08 Join Date: Apr 2011 Location: Berkhamsted	It could be that the recirc valve can't take the extra pressure - its not like they are new anymore, or it could be the wastegate actuator being worn meaning that the exhaust gases are pushing the wastegate open meaning that you lose boost. Im guessing before you have upped the boost you have done all the supporting mods like cooling, ignition and fueling along with brake upgrades for the extra power? __________________ 2003 Volvo V40 1.9D Sport - MPG below

Sep 30th, 2012, 21:16	#5
atnas666 Proud T4 owner Last Online: May 5th, 2021 16:04 Join Date: Oct 2011 Location: guildford	Fuel,ignition and brakes are all good __________________ '99 S40 T4 (Running on LPG) '97 S40 2.0CD (Sold to Completefluke) Volvo FM12 420Bhp Draw-bar - Car Transporter

Sep 30th, 2012, 21:35	#8
bigyin85 S40 T4 Sport Last Online: Nov 21st, 2023 15:01 Join Date: Aug 2012 Location: Norwich	how many turns did u do mate? __________________ Current motor 02' Volvo S40 T4 Panama Yellow, JT turning 3inch full stainless from turbo back, pipercross induction kit, forge dump valve and blanking plate, Coilovers, 17" Dezent Alloys Previous motor 97' Volvo V40 1.9 T4 CD 200bhp

Sep 30th, 2012, 21:38	#9
atnas666 Proud T4 owner Last Online: May 5th, 2021 16:04 Join Date: Oct 2011 Location: guildford	4 turns mate. test drove after each turn... __________________ '99 S40 T4 (Running on LPG) '97 S40 2.0CD (Sold to Completefluke) Volvo FM12 420Bhp Draw-bar - Car Transporter

Sep 30th, 2012, 21:41	#10
bigyin85 S40 T4 Sport Last Online: Nov 21st, 2023 15:01 Join Date: Aug 2012 Location: Norwich	how do she feel? __________________ Current motor 02' Volvo S40 T4 Panama Yellow, JT turning 3inch full stainless from turbo back, pipercross induction kit, forge dump valve and blanking plate, Coilovers, 17" Dezent Alloys Previous motor 97' Volvo V40 1.9 T4 CD 200bhp

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