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Boost Issues on my '98 S70

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Posts: 17
Joined: Mon Dec 16, 2019 7:54 pm
Year and Model: 98 S70 GLT; 07 V70 2
Location: Concord, NC
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Boost Issues on my '98 S70

Post by my98s70glt » Wed May 27, 2020 6:01 pm

Boost on my ‘98 S70 GLT... thanks to bmdubya for already giving me advice.

Car is essentially Stage 0. Running 16T w/stock T5 ECU and white injectors. Does not burn oil. Recently replaced vacuum lines... no leaks, verified with smoke test. Recently installed pierburg P2R TCV. CBV holds vacuum at 15inHg. Car freely boosts without spikes when WG hose is disconnected from TCV. Car boosts to 4-6psi if I unplug TCV while all hoses still connected. WG is set to ~4.5psi using a converted blood pressure cuff.

Here’s what is happening... feels like an all or nothing situation.
When I moderately to semi-aggressively accelerate from a standstill I am not getting boost through any gears (even as I hit 50mph). If I let off the pedal for a moment at anytime regardless of speed and then re-engage, the car starts to slowly register to maybe 2-5psi. If I floor it while already moving the boost spikes to ~13 psi then hovers around 10psi until I release gas pedal. Any suggestions? Thanks
1998 S70 GLT: T5 ECU || 16T Turbo || White Injectors || Snabb RIP Kit || Snabb Fresh Air Pipe || Bilstein Touring || Eibach Lowering Springs || 17” Neptunes

2007 V70 2.5T: Snabb Fresh Air Pipe || BC Racing Coilovers

Previous: 2006 V70 2.5T, 2011 C70 T5, 2012 S60 T5, 2000 S70 GLT/SE

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