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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Strange boost problem on my friends v70rViews : 1503 Replies : 19Users Viewing This Thread : |
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Sep 2nd, 2021, 19:30 | #1 |
Master Member
Last Online: Mar 11th, 2022 22:01
Join Date: May 2010
Location: manchester
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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
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Sep 3rd, 2021, 17:50 | #2 |
Master Member
Last Online: Mar 11th, 2022 22:01
Join Date: May 2010
Location: manchester
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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
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Sep 6th, 2021, 21:50 | #3 |
Senior Member
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Quick question:
What does yours boost at in 1st? 13psi? |
Sep 6th, 2021, 22:08 | #4 |
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Last Online: Jun 21st, 2024 20:26
Join Date: Feb 2013
Location: Lockerbie
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I thought boost was restricted in first gear to prevent too much wheel spin....
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Sep 6th, 2021, 23:15 | #5 |
Senior Member
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Me too. But I'm less familiar with me7, hence the question to the OP.
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Sep 7th, 2021, 11:08 | #6 |
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Last Online: Jun 22nd, 2024 14:01
Join Date: Jul 2006
Location: Chatham
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If he gets 6 and 13psi and your cars are the same, what numbers do you get?
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Sep 7th, 2021, 21:26 | #7 |
Master Member
Last Online: Mar 11th, 2022 22:01
Join Date: May 2010
Location: manchester
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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
Last edited by andrewc1267; Sep 7th, 2021 at 21:32. |
Sep 7th, 2021, 22:13 | #8 |
Premier Member
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Is it auto ?
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V70 P2 facelift D5 6sp manual E4 Sport SE Ocean Race Blue pearl (2005) 97k, standard. |
Sep 8th, 2021, 23:07 | #10 |
Premier Member
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I know some auto maps had a lower boost in the lower gears as to not destroy the gearbox.
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V70 P2 facelift D5 6sp manual E4 Sport SE Ocean Race Blue pearl (2005) 97k, standard. |
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