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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » Qashqai Intake Manifold Pressure

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Author Topic: Qashqai Intake Manifold Pressure
hwarui91
Member
Posts: 5
Post Qashqai Intake Manifold Pressure
on: August 10, 2020 (GMT)

I have a Qashqai J11B, 1.2 Dig-T engine. The Vacuum / Boost Pressure does not seem to reflect correctly.

The lowest value has been measured at -27.2in/Hg, while the highest have been measured at -23.3 in/Hg, reving up to 4000 rpm at low gear and high gear.

Is there any setting or configuration I will have to use to let it show vacuum and boost correctly?

Capp777
Member
Posts: 2860
Post Re: Qashqai Intake Manifold Pressure
on: August 10, 2020 (GMT)

Does your boost equal zero with KOEO?

If not you may need to edit the vehicle profile
for your altitudes baro.

Your data seems vacuum related. Have you
tried looking at MAP?

hwarui91
Member
Posts: 5
Post Re: Qashqai Intake Manifold Pressure
on: August 11, 2020 (GMT)

Hi,

my boost is not zero when KOEO. I have tried to adjust the boost adjustment and successfully zeroed it.

However, when I start, it does not go into vacuum. And after test, the max I could get was the same difference as described, i.e the difference of 4in/Hg, but in the boost portion because I zeroed it.

I am using the MAP calculation method, but I have not looked into any type of graphing. Any advise on that one?

Chrispy
Member
Posts: 12
Post Re: Qashqai Intake Manifold Pressure
on: August 13, 2020 (GMT)

There is a custom PID you could try.

Header 7E0
PID 22240B
Units mBar
Equation 256A + B or INT16(A:B)

hwarui91
Member
Posts: 5
Post Re: Qashqai Intake Manifold Pressure
on: August 17, 2020 (GMT)

Thanks. I’ll give it a try and report back.

Quote from Chrispy on August 13, 2020
There is a custom PID you could try.

Header 7E0
PID 22240B
Units mBar
Equation 256A + B or INT16(A:B)

hwarui91
Member
Posts: 5
Post Re: Qashqai Intake Manifold Pressure
on: August 17, 2020 (GMT)

Hmm. i just tested the custom PID.

Here are the results :

KOEO : ~ Positive 1000 mBar
Engine On : ~ Positive 425 mBar

Chrispy
Member
Posts: 12
Post Re: Qashqai Intake Manifold Pressure
on: August 17, 2020 (GMT)

That sounds fairly sensible.
Engine off is atmospheric pressure (around 1 bar).
Idle is a partial vacuum.

What do you get if you drive? Ideally get to full throttle in a high gear so it can build boost pressure. Revving up and down in neutral is no good as it doesn’t generate any real load on the engine.

hwarui91
Member
Posts: 5
Post Re: Qashqai Intake Manifold Pressure
on: August 17, 2020 (GMT)

i shall try driving on the road today to find out.

thanks!

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