[iamz]

So I have a boost gauge hooked up to my car and I'm finding the car showing some form of boost almost continuously. Even just cruising at a steady 60 mph. Is this normal for this engine?

 

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So I have a boost gauge hooked up to my car and I'm finding the car showing some form of boost almost continuously. Even just cruising at a steady 60 mph. Is this normal for this engine?

Off throttle (or idle) it should definitely be off boost.

Other than that, it is very normal for this engine to show various amounts of boost at different throttle inputs.

Typically when cruising steadily(key word) anywhere from 40-80mph you should see anywhere from 0-5psi, depending on environmental factors, road incline, etc. That is perfectly normal for the 1.4L Multiair Turbo.

 

[iamz]

Interesting. And yeah, I was seeing no boost or even negative numbers while engine braking (off throttle). I've never had a car with a turbo so was surprised to see that. Thanks.

 

[Greg]

Interesting. And yeah, I was seeing no boost or even negative numbers while engine braking (off throttle). I've never had a car with a turbo so was surprised to see that. Thanks.

Where are you tapping in for the boost gauge pressure reading?

Greg

 

[iamz]

Where are you tapping in for the boost gauge pressure reading?

Greg

I'm using something called an Ultragauge, that just takes readings off the OBDII port. I have one for my other car and find it really useful for maximizing my fuel mileage. You can set it up to read just about anything that the car has available and reports on. I was also surprised to see that the coolant temps are running between 174 - 176 F. This car definitely has a good cooling system.

Heres the link; http://www.ultra-gauge.com/ultragauge/

 

[Greg]

I'm using something called an Ultragauge, that just takes readings off the OBDII port.

That makes sense. I haven't used that specific product, but I have used others like it.

Regarding boost, there are some things to know. First, there are two sensors. If you have it set up to read the pre-throttle sensor it will never show vacuum and will show relatively high boost in cruise on the highway (like 5psi). If you have it set up to read the sensor in the manifold it will read boost and vacuum, and be much more accurate.

A couple years ago I made a video to show readings from both sensors and how they relate to each other.

If your car is tunes, know that the boost readings from the OBD2 port will never show above 22.6, and if you have a piggy back type box (like Euro+Drive Lite) the readings from the OBD2 port will show stock values.

Greg

 

[iamz]

Thanks for posting that video Greg - that explained a lot.

 

[linefeed]

UltraGauge?

I'm using something called an Ultragauge, that just takes readings off the OBDII port. I have one for my other car and find it really useful for maximizing my fuel mileage. You can set it up to read just about anything that the car has available and reports on. I was also surprised to see that the coolant temps are running between 174 - 176 F. This car definitely has a good cooling system.

Heres the link; http://www.ultra-gauge.com/ultragauge/

I had looked at the UltraGauge, but their compatibility list stopped at 2015 and didn't mention Fiat anywhere... Since you have two now, I'm going to assume that you like it?