Strange boost problem on my friends v70r

andrewc1267 · Sep 2nd, 2021, 19:30

The car is the same as mine 1998 V70R ME7 when you accelerate in first gear the boost goes to about 6 psi and stays there in every other gear the boost goes to 13 psi the car is totally standard any ideas why

andrewc1267 · Sep 3rd, 2021, 17:50

Tried today putting a MBC on the car in place of the solinoid and controlled the boost carefully with the throttle and car drives loads better but obviously cannot be left like this we have smoke Pro all the intake system and the vacuum system and all is good I have also replaced the one way breather valves under the manifold one had failed but replacing it made no difference to the boost problem I also swapped the TCV with mine and still no difference any ideas as this is becoming really irritating now

Shinsplintz 101 · Sep 6th, 2021, 21:50

Quick question:

What does yours boost at in 1st? 13psi?

sda2489 · Sep 6th, 2021, 22:08

I thought boost was restricted in first gear to prevent too much wheel spin....

Shinsplintz 101 · Sep 6th, 2021, 23:15

Me too. But I'm less familiar with me7, hence the question to the OP.

Derek UK · Sep 7th, 2021, 11:08

If he gets 6 and 13psi and your cars are the same, what numbers do you get?

andrewc1267 · Sep 7th, 2021, 21:26

Quote:

Originally Posted by Shinsplintz 101

Quick question:

What does yours boost at in 1st? 13psi?

It makes about 6psi in 1st gear the car used to be loads quicker with the MBC connected higher in the revs it gets 19psi with no boost cut no limp or over boost codes which makes me suspect that it may have been remapped eairler in its life I have ran a wideband air fuel on it and even at that boost it fuels really well when it was alot quicker never had a boost gauge fitted so I have no reference point

SIAMBLUE · Sep 7th, 2021, 22:13

Is it auto ?

andrewc1267 · Sep 7th, 2021, 22:26

Quote:

Originally Posted by SIAMBLUE

Is it auto ?

No it's a fwd manual

SIAMBLUE · Sep 8th, 2021, 23:07

I know some auto maps had a lower boost in the lower gears as to not destroy the gearbox.

Sep 2nd, 2021, 19:30	#1
andrewc1267 Master Member Last Online: Mar 11th, 2022 22:01 Join Date: May 2010 Location: manchester	Strange boost problem on my friends v70r The car is the same as mine 1998 V70R ME7 when you accelerate in first gear the boost goes to about 6 psi and stays there in every other gear the boost goes to 13 psi the car is totally standard any ideas why

Sep 7th, 2021, 22:13	#8
SIAMBLUE Premier Member Last Online: Apr 18th, 2024 03:43 Join Date: Dec 2003 Location: Ilford, Essex. View Photos By: SIAMBLUE	Is it auto ? __________________ V70 P2 facelift T5 2.4 6sp manual SE Silver pearl (2005) 210k stage 2 315bhp V70 P2 facelift D5 6sp manual E4 Sport SE Ocean Race Blue pearl (2005) 97k, standard.

Sep 8th, 2021, 23:07	#10
SIAMBLUE Premier Member Last Online: Apr 18th, 2024 03:43 Join Date: Dec 2003 Location: Ilford, Essex. View Photos By: SIAMBLUE	I know some auto maps had a lower boost in the lower gears as to not destroy the gearbox. __________________ V70 P2 facelift T5 2.4 6sp manual SE Silver pearl (2005) 210k stage 2 315bhp V70 P2 facelift D5 6sp manual E4 Sport SE Ocean Race Blue pearl (2005) 97k, standard.

Sep 3rd, 2021, 17:50	#2
andrewc1267 Master Member Last Online: Mar 11th, 2022 22:01 Join Date: May 2010 Location: manchester	Tried today putting a MBC on the car in place of the solinoid and controlled the boost carefully with the throttle and car drives loads better but obviously cannot be left like this we have smoke Pro all the intake system and the vacuum system and all is good I have also replaced the one way breather valves under the manifold one had failed but replacing it made no difference to the boost problem I also swapped the TCV with mine and still no difference any ideas as this is becoming really irritating now

Sep 6th, 2021, 21:50	#3
Shinsplintz 101 Senior Member Last Online: Apr 22nd, 2024 17:23 Join Date: Jan 2011 Location: Baldock View Photos By: Shinsplintz 101	Quick question: What does yours boost at in 1st? 13psi?

Sep 6th, 2021, 22:08	#4
sda2489 Member Last Online: Apr 17th, 2024 21:27 Join Date: Feb 2013 Location: Lockerbie	I thought boost was restricted in first gear to prevent too much wheel spin....

Sep 6th, 2021, 23:15	#5
Shinsplintz 101 Senior Member Last Online: Apr 22nd, 2024 17:23 Join Date: Jan 2011 Location: Baldock View Photos By: Shinsplintz 101	Me too. But I'm less familiar with me7, hence the question to the OP.

Sep 7th, 2021, 11:08	#6
Derek UK VOC Member Last Online: Yesterday 14:24 Join Date: Jul 2006 Location: Chatham	If he gets 6 and 13psi and your cars are the same, what numbers do you get?

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