Hi

Just to check before I go further - have you entered the engine displacement in the settings? - the MAF boost calculation uses this as part of the calculation so this would be the most likely reason why it would be off

Ian

Yeah I have/had it set to 2.8

Hi
I have the same problem with the boost measurement on my tuned VAG 1.8 20vt petrol engine.
I have set engine size to 1.8, but it also lies about -12 to -13 psi, at cruising speed, but gets up to about -0,5 at full trottle. I would expect it to peak at 17 psi.

Having the same problem on Corsa OPC 1.6L .
Min : -1 bar
Max : -0.1 bar

Expecting maxi 1.6 bar...

Is there a solution ?

I noticed the same problem too on my WRX. I think it has to do with the "Don't display psi as in/Hg" setting. Try toggling that one way or the other.

Right now, the boost works correctly for me. It goes up to 12PSI positive, and when in vacuum, it measures in in/Hg instead of PSI.

For me, ticked or not, boost is between -1b and -0.1b 🙁
MAF works and Intake manifold pressure doesn't work.

I have the same issue. PSI always negative.

Audi 2.7T

I get MAF but no Baro reading.

I doesn't seem to matter if its PSI or in/Hg.

I have tried various numbers in the correction field.

Such a shame as it's the main reason I got the app.

Yep, me too 🙁

Quote from Shark on March 25, 2011, 15:08
Yep, me too 🙁

Yep, me three.

2002 Audi A4 1.8t GIAC chipped. IIRC, the turbo boosts to 8 or 10 PSI or so. Stock is 7 or 8 PSI.

My dial marks read 0 at the bottom, then towards the negative side, -0, -1, -1, -1, ending around the 1 o'clock position.

Towards the positive side, it reads 0.3, 0.5, 0.8, 1, 1.3 and 1.5, so it looks like the positive displays correctly.

Also the needle flails all around the place at the slightest tap of the throttle.

I'm happy you were able to make some progress on VW cars, but it's not there 100% yet. Anything I can do to help, lemmie know.

I'd also like to make the request that the 'Settings' button be available from all screens, not just the home screen.

BTW, Google Checkout refused to work with my Android 2.1 Transform phone, but since upgrading (if you can call it that) to 2.2, it worked. So, naturally I bought Torque. Dang, its a steal of a deal.

So I noticed that there must have been a change but it is still inaccurate. My reading now stops at 4psi.

After going back I noticed that the app now uses a profile for each vehicle and that it was on generic. So I needed to create one for the Saab, so the engine size was set to 1.6 and not 2.8 and that why it had gone up from 0psi to 4psi. So problem not changed.

Right, may have something on this in the next update - just needs properly testing

Hi
Sounds perfect, I think that we a lot of VAG car owners, just waiting for this measurement to work, so we can measure the turbo boost 🙂

I noticed the vacuum seems to be off by about half ie if my gauge reads -20psi torque displays -10.5. I just got the app but I'll do some more testing with positive pressures but so far seems close. 2004 Neon SRT4

depending on the type of vehicle ECU, you may have to compensate for atmospheric pressure by using the 'boost adjust' option in the vehicle setup. Typical values would be -14.7, 0, or +14.7 (which is atmospheric pressure at sea level).

At higher altitudes the pressure will decrease, so this lets you adjust to get an accurate reading. If the car has a barometric pressure sensor, then this is done automatically for you

Ian

Its not possible to have -20psi, the highest barometric pressure ever recorded was 15.75psi
the atmosphere is usually around 14.7psi, so the max you would read on your gauge would be -14.7psi, since there is never a full vacuum with closed throttle your more likely to read around -12 to -13psi

Which is what the boost adjust settings is for. He's probably reading (in actuality) around -6 to -12 psi whilst at idle(depending on vehicle). But because his MAP sensor is or is not compensating for atmospheric pressure, he's getting his -20psi reading.

He needs to use the boost adjust figure in the vehicle profile settings to cancel out the atmospheric pressure that his MAP sensor is offset by. Not all vehicles do this, which is why it is a manual option.

So, for his reading, -20 + 14.7 = -5.3 vacuum, which would be in line with what would be expected for idle. (though it's better to talk in/Hg or kPa as negative psi is a bit 'odd' 🙂

Ian

I thought he was saying that he wanted torque to say it was at -20psi because that was what some other gauge he had installed was telling him, to me it sounded like torque was functioning properly

Hi Piemmm,
I see in the change log that you say you've fixed the boost gauge, is that pertaining to this issue?
On my drive into work this morning it did not seem to function diffrently.
I will test again on my drive home, let me know if you want me to send you any logs.
Thanks,
Bob

Tried it too.
Fixed the boost adjust setting to -14.7, 0 and 14.7, and nothing different...

Always from -1bar to -0.1bar.