Since its not a transient issuse, and I've never seen the Mitsu 3 bar give inaccurate readings, so I'd say that your boost gauge is off by even more than you thought.

 

It doesn't seem like the boost gauge is that far off, but Likely I'll get one that reads up to 35 psi shortly anyways, one that is hopefully more accurate!

The problem is when I turn up my manual boost controller it has always been between .5 and 1.0 psi per 1/4 turn of adjustment. Now that I am 1 full turn above where it was delivering 26.5 psi and my boost gauge is peaking at 31 psi (~29 psi actual) instead of 28 psi (~26.5 psi actual) it makes sense that I'm showing 30 WTQ gains in Virtual Dyno Room with the ~2.5 psi higher boost.

When running this higher boost level it seems to be maxxed out much higher into the RPM range leading me to believe it's capped somehow. If I run 26 psi or 25 psi at torque peak, there is always a very predictable taper of a 1 psi drop by 6900 rpm and a 2 psi drop by 7400. I guess it could be some magical flow limit of the turbo or my boost controller is refusing to go past 26.5 psi but somehow I find that hard to believe due to the increase seen on my boost gauge, even if it is not 100% accurate.

I guess my next question is can anyone show me their logs that is running higher than 27 psi of boost or at least verify you are seeing higher numbers?

 

i logged 26.97psi last night, im pretty sure the boost error correction is stopping it though.

Ill give it a wee bit of a tweak and see if it will go higher tomorrow

 

The InVVT is showing the exact same numbers as the ExVVT.

 

JDM? I'm logging a few cars with no problems including manual and SSTs.

 

Thanks man! Bumping .5 psi down low should be pretty safe as a temporary test, just log your knock counts before testing the peak torque boost level more than once.

It's totally bizarre as sometimes I can get it to read a little higher as well depending on how warm the car is, possibly "sensor drift" based on it's temperature where my max is anywhere between 26.6 and 27.0 psi. I'll test to see if my second boost controller that I normally have set to a lower boost also hits a "brick wall" in adjustment and see what kind of boost spike a restrictor line to the Forge WGA induces and if it makes any difference as well.

It's not the end of the world as normally I won't run higher boost on pump gas but running mostly blind on race gas is still uncomfortable.

 

Its definitely not a capped value. EvoScan is setup to read the raw ADC value. I maxed out my sensor at 32.xx psi about a month ago when I did the "Help" spring mod on my Evo 9. I've also bench tested the sensor to around 32 psi.

 

I guess a boost leak check would also test the sensor range out as well. Test at 26 psi and see what it reads then go up and see what 30 psi reads which is about as high as I would want to test.

Speaking of boost leaks, I suppose it's possible my BOV is leaking or something else is opening up past a certain boost pressure. I would imagine that I would see some other symptoms if it was capping my boost like that though. Hopefully I'll get to the bottom of this soon as it's driving my nuts.

 

No, USDM. I added your new data file yesterday and logged a pull on the way home from work and the VVT numbers are both the same.

 

I verified on the way to the office that going from a 26 psi "low boost" setting to my current high boost setting was 3-4 psi differential on my boost gauge as soon as I flipped the switch. You may have tested the sensor but did you test it specifically on an Evo X with the EvoScan interface? Until I see someone else prove that they can read higher than 27.0 psi boost I'm going to have to assume it's capped for some reason and use my gauge as a best guess of what I'm running.

 

I've never done any specific testing with an Evo 10, but there's nothing in the ROM code that caps the value. There are a couple ways that you could figure this out.

1) Simulate the MAP sensor signal going into the ECU. You'll need 3 AA or AAA batteries connected in series with some flying leads. Radioshack sells battery holders that are perfect for this. You'll need to disconnect the plug from your MAP sensor and check the voltage supplied to the sensor. Blue is power and black/white is ground. With a voltmeter, you should see 4.95-5.05 V. Next, connect the three batteries in-series (giving 4.5 V) across the sensor wire (yellow/blue) and ground (black/white). Turn the ign to "on" and log boost with EvoScan. You should see 30.0 psi.

2) Do a boost leak check as you suggested earlier.

 

To me link for downloading not work.

 

Another possibility just crossed my mind. I had been told that the Evo 10 MAP sensor is exactly the same as the JDM Evo 9 MAP sensor, but perhaps its not. If it were a 2.5 bar MAP sensor instead of a 3 bar MAP sensor, then according to my calculations, the max boost level that it could measure would be 26.75 psi. Looks to be pretty much what you are measuring. Can you post the part number on your MAP sensor?

 

Was it working correctly before you used this new xml?

 

I'll get the number off it in the morning. If it does end up being a 2.5 bar sensor, what would happen if we replaced it with a 3 bar? If I had to guess it would need to have a similar voltage range and go higher for that last .5 bar for it to work right.

I also exceeded my boost limits tables tonight just as I was showing my friend how hard the car pulls now, seemed to trigger in 5th at 30 psi of boost lol... While normally I don't like seeing check engine lights, this one means I'm pumping some serious airflow through the engine to trigger that.