Need Ecutek gurus

[Last Lemming]

I have an OTS stage 2 tune for my 2020 supra. Can someone tell me what’s going on with my Ecutek gauges, under the Target Boost Pressure (in psi) if I just crack the throttle at idle it’s reading 21 psi - that can’t be possible can it? Is there something going on here how do you get it to read the correct boost pressure? I hope to God that’s not the right pressure at least! Also, whenever I’m driving and I give it a little bit of throttle I’m getting 28 pounds of boost, somethings not right.

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[razorlab]

You don't want Target, you want Actual.

 

[Last Lemming]

I’m not in my car right now but is @actual boost” an actual gauge you can select, I don’t remember seeing that one in the Ecutek selections?

 

[zrk]

Are you forgetting that they're absolute pressures? You have to subtract ambient.

 

[Last Lemming]

Ah. I might be. So it’s whatever the boost is minus 14.7 psi? Is there a gauge in the app that does this already?

 

[zrk]

Ah. I might be. So it’s whatever the boost is minus 14.7 psi? Is there a gauge in the app that does this already?

I don't think so, but if there is, it'd be something like 'boost pressure pre-throttle relative.'

 

[razorlab]

Are you forgetting that they're absolute pressures? You have to subtract ambient.

Target is what the ECU is requesting, Actual is what it is... well, actually doing. Either way you want to be logging Actual for accurate boost, no matter if it's PSI absolute or PSI gauge.

Perfect example and probably closer to what the OP is seeing, the car is actually making 3.4 psi even though the target is 11.7 psi.

 

[Last Lemming]

I see in the log like this:

Boost pressure error (psi)-4.1 psi
Boost pressure pre throttle (Filtered)-29.2 psi
Boost pressure target-33.4 psi

 

[razorlab]

I see in the log like this:

Boost pressure error (psi)-4.1 psi
Boost pressure pre throttle (Filtered)-29.2 psi
Boost pressure target-33.4 psi

Pre throttle is what you want, and you want to switch it to gauge pressure, not absolute, unless you like doing math all the time.

Absolute pressure - ambient pressure = gauge pressure.

 

[Last Lemming]

So gauge pressure in this case would equal about 14.5 psi of boot correct? Assuming 14.7 atmoshere.

also, between shifts the boosts climb dramatically. For instance as I accelerate I see max 20 psi, then the car shifts and I see 31 psi. Normal?

 

[MYA90SUPRA]

I don't think so, but if there is, it'd be something like 'boost pressure pre-throttle relative.'

What a strange way to say atmospheric pressure.

 

[razorlab]

What a strange way to say atmospheric pressure.

That’s not atmospheric pressure.

 

[razorlab]

So gauge pressure in this case would equal about 14.5 psi of boot correct? Assuming 14.7 atmoshere.

also, between shifts the boosts climb dramatically. For instance as I accelerate I see max 20 psi, then the car shifts and I see 31 psi. Normal?

Depends on your elevation. You can also log that. Or just look up your closest weather station to ball park.

How big the boost spikes are between shifts are dependent on your tune.

 

[Last Lemming]

Well I’m in Louisiana so I’m pretty sure it’s 14.7. As for the tune its an OTS stage 2 so 22 psi is the max.

 

[zrk]

Target is what the ECU is requesting, Actual is what it is... well, actually doing. Either way you want to be logging Actual for accurate boost, no matter if it's PSI absolute or PSI gauge.

Perfect example and probably closer to what the OP is seeing, the car is actually making 3.4 psi even though the target is 11.7 psi.

I uh.. know.

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