HPO health

[eabrust]

Originally Posted by Power Hungry

I looked over the graphs a bit and I'll have to compare them against the ICP tables in your files. It does seem odd that you're barely hitting 2000 PSI most of the time and it makes me wonder if the scaling in the AE software might be off. Based on the ICP Desired tables, at full throttle above 2400 RPM the ICP output should be be at LEAST 3200 PSI if not more. I get the feeling something is a bit screwy. One thing that is good is that your Desired and Actual ICP values track very closely together. This is a good indication that your HPOP may be just fine.

Morning Bill,

Wondering if you might still be able to take a peek at my tunes regarding the peak ICP I'm seeing using AE in my 80DD vs 100 Perf tunes. I wanted to try to rule out AE and scaling, as I'd hate to find I have an expensive diagnostic tool that gives 'junk' data depending on the tune....

In stock, I can get ICP up over 3500 psi, and reported IPR DC is ~77%.

In the 100 Perf tune, ICP doesn't get quite as high, but still over 3000 psi, with IPR DC ranging from 75-85% I assume that the lower pressure for the same IPR DC as stock is due to the injection pw increase and use of more oil, (but I wasn't recording PW at the time to compare that ).

In the 80DD tune, ICP always stops right at 1740 psi, no matter what, and IPR DC is only around 60% maximum. Unless the given tune could possibly affect the scaling or passing of data to AE, it seems the data indicates the truck isn't trying to make any more pressure given that IPR DC stops increasing also.

No complaints on any of the tunes, as the 80DD runs great and is the tune I run most. I just really want to understand what I'm seeing to know that AE isn't providing bogus data and everything is working (at least as the tunes are commanding).

Regards
Eric

[SICKS-O]

the scaling could be skewed, its a good idea to monitor ICP voltage. 5v icp is 4000psi. 22-25% IPR is right on for warm idle.

[cleatus12r]

Originally Posted by SICKS-O

the scaling could be skewed, its a good idea to monitor ICP voltage. 5v icp is 4000psi. 22-25% IPR is right on for warm idle.

You're right on with mentioning the voltage.

Eric, I just had a little discussion with Bill (mainly one-sided as I was just listening) and he said that the voltage is what you want to pay attention to, not the listed ICP.

[eabrust]

Thanks SicksO and Cody for the responses/suggestions,

I will go down the path of measuring voltage directly and report the outcome, I was saving that as a last ditch effort, hoping to get confirmation of what the peak number in the tune actuall was (I bought AE so I wouldn't have to string wires to a voltmeter, but I get that it is the only way to validate the question at hand).

Guess what buggs me, how could the PID data passed to Autoenginuity get 'skewed' depending on the tune? Kind of makes the use of AE (or any other scan tool) a bit 'unpredictable' or even untrustable (assuming I measure voltage that indicates the data is skewed...yet to be confirmed in all fairness to AE).

regards,
Eric

[eabrust]

Alright, finally got my new toy(s) in and tested actual ICP voltage today.

First I got a programmable digial multimeter tapped off the ICP sensor output lead (and scaled such that 0 volts = -143 psi, 5 volts = +4015 psi, (based on line fitting the ICP volts vs pressure data I could find)).

With KOEO, reading was 74 psi (or .26 volts)

When idling, readout is ~550-600 psi fluctuating (or ~.87 volts)

When in the 80DD tune, the readout plateaued and stuck at 2180 psi (or 2.79 volts) no matter how long or how hard hammering the accelerator. This is similar to what I saw w/ AutoEnginuity, except that value AE reported peaked at 1740.

When in the 100Perf tune, the readout, the peak value I saw was over 3800 (or 4.75 volts)

So there is a slight difference in overall values between voltage output and AE reading, likely an error in how AE scales or how I have my scaling on the readout. But in general, this shows that my 80DD tune still has something funny about it, which caps the ICP pressure at what ever can be achieved with an IPR DC of ~60% (which is what it always maxes at in the 80DD).

So I'm happy to report that AE seems to be pretty truthful in reporting everything I've documented, which was my big worry.

Bill, for a cross check of my sanity , could you please look at my 80HP tune and validate if you see something funky please?! Pretty Please

As far as the multimeter gauge I found, if anyone cares, I got these Auber multimeters (Automobile Multimeter for EGT, Boost, Red [SYL-1813R] - $48.50 : auberins.com, Temperature control solutions for home and industry), for the price, they are awesome! They will do 0-5V, 0-10V, RTD, thermocouples, mV signals, etc. I bought 2 and am hooking up the 2nd for fuel pressure gauge. They have peak/min value recall, and alarms, and I like the fact if you know what your sensor puts out, you can calibrate the readout to know what you got for any kind of sensor. I attached some pics of it very temporarily hooked up for reference, the pictures don't do it any justice.... but I like it alot. Plan to put em on the dash next to the Gryphon.

Eric

[eabrust]

Bump to try and catch Bill or Cody's eye

I'm still just looking to see if there is anything in the my 80HP tune that would cap ICP, as I've verified by voltage measurement something is limiting the the peak value, as was reported by AE also (strictly only in the 80HP tune, despite it driving well in that tune).

Its still mostly curiosity killing the cat on my part

thanks,
eric