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850 Turbo...A Couple Questions

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

BeachWagon
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Year and Model: 2002 V70
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BeachWagon

Re: 850 Turbo...A Couple Questions

Post by BeachWagon » Mon Nov 25, 2019 5:42 pm

That, I do plan to do. I was looking at Kinugawa products for this turbo and might actually get the billet adjustable BOV. It bolts in place of the CBV, comes with different springs. Any suggestions for a good sturdy diaphragm?

For now, the TCV has alleviated my issue. I went to the junkyard, snagged a bunch off various turbo Volvo's[they were a buck a pop], cut off a pig tail, took them home. Applied 12 volts, picked the snappiest one. Turns out, this car[at least with this tune] is not at all picky about the TCV!

So in closing, bad TCV can hide on a car if you don't know exactly how it's SUPPOSED to boost. Here I was kicking around with the stock tune thinking "okay yeah this thing's kinda quick for a 90's wagon", accepting that's how it was supposed to be. The ONLY reason I knew there was a problem, was due to installing an aftermarket ECU that's supposed to give a SIGNIFICANT power increase. No change indicated something was wrong!



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