I just got the boost gauge installed after a lot of grief.

Now, when I tried it out just now, it sits on -0.8 bar while idling, boosting up to around +0.7bar at maximum throttle, but plaining out at +0.6 when holding max throttle.

I thought this car should boost up around +0.8 to +0.9 ?

- Niclas
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-[Volvo V70 T5 1998 - JRE OptiFlow, BSR 3" exhaust, 285BHP]-

Boost is governed by the ECU. For more boost, you'd need to upgrade the chip. Check http://www.tme.com for a good lesson about this topic. You can, I believe, read it in your native Swedish.
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)

Hiya,

sorry but thats another issue. Im not looking for _more_ boost. I want the original and that is way above +0.7 bar. Is should be upwards +0.9 bar. Im thinking leakage somewhere right now.

- Niclas
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-[Volvo V70 T5 1998 - JRE OptiFlow, BSR 3" exhaust, 285BHP]-

I have never seen a stock V70 with 13psi boost. Thats about what .9 bars is. .7 bars is closer to what you should be getting at around 10 psi. Also with the downpipe your fuel mix is running on the rich side. That could have something to do with it.

Check the connection at the back of your gauge. I had to re-do this connection three times before I got the connection leak free. I used teflon tape on the threads and around the outside of the compression bushing....and a little plumber's putty smeared around the outside of the connection at the back of the gauge. You have to tighten the connection pretty securely - but not so tight as to crush the tube.

also, make sure your connection on the vacuum tree is secure. Tiny vacuum leaks can make your gauge read differently than you should.

finally, at low speeds, your ECU limits boost. Up to around 30mph, my car sustains 4-5lbs of pressure, then is realeased to around 9-11lbs sustained pressure. I see momentary spikes about 5lbs higher on certain occasions.
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)

Stock boost is about 11 psi at max. So your about where you should be. Seems alittle low for having a dp, but your fuel mix is off also I am sure.

Hi!

Thanks for your answer.

One more question though, what do you mean by "Seems alittle low for having a dp, but your fuel mix is off also im sure."

Since this is not my native language im a bit confused over the word "dp" and also regarding the fuel, im using 98 RON which is recommended by Volvo for this car. Other models (at least here in Sweden) are usually recommended only 95 RON but since this is a high pressure turbo it says 98.

Everything you can recommend me as of what I should ask from my service shop the next time I am due for it to have the car running as it should.

Regards,

Niclas
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-[Volvo V70 T5 1998 - JRE OptiFlow, BSR 3" exhaust, 285BHP]-

dp = downpipe (3" freeflow exhaust)
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)