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post #1 of 9 Old 02-07-2014, 07:10 PM Thread Starter
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Hpop issue?

I have a 2005 Ex with 170k miles on it and original hpop. I'm running an SCT tuner with175 cc injectors. In stock mode I can build almost 4000 psi of injector oil pressure with ipr around 80%. Pressure desired and actual are right on the money thru any rpm range. In performance mode, I barely build 3100 psi and my ipr is pegged at 84.7%. I assume this is related to more volume required with the additional fuel being supplied. My question is, do I have a weak pump based on the numbers I've given in stock mode? I understand I could have a leak somewhere, but I did all of the updates to the oil rails and replaced injectors about two years ago.
The reason I was investigating all of this is because I seem a little low on power and it's been shifting differently. I did just replace batteries. They were basically dead and saw very low ficm voltages. 41 to 45 volts at times. Since battery replacement I've not seen ficm voltages under 45V.
Looking for some insight. Any help would be appreciated.

Thanks!
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post #2 of 9 Old 02-07-2014, 07:24 PM
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How are you watching ICP pressure? Tuning manipulates the ICP numbers to make it run right so a lot of times the ICP pressure will be inaccurate. You need to watch the ICP voltage when tuned to get the right reading.

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post #3 of 9 Old 02-08-2014, 03:17 AM Thread Starter
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I'm using an AE scan tool. What are the min max ranges of the icp voltage? What should I see ideally?
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post #4 of 9 Old 02-08-2014, 06:41 PM
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The AE will not read the true pressure when on a tune. You need a separate gauge, volt meter or DashBoss. I doubt 175s would not hold pressure, especially plugged injectors. The PW will be the determining factor for whether it is low on pressure.

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post #5 of 9 Old 02-08-2014, 10:34 PM
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Tunes and their effect on diagnostics

Once you throw a tune into the mix you are no longer STOCK.

All diagnostic procedures and self tests are based on OEM stock parematers.
With a tune in place and you run a scan you never know what values may be off and by how much mainly because tuners don't make public what they change or what they change it to.

This is their bread and butter after all and understandable why they don't share.

When I know their is a tune and I have to run diagnostics I ask that the tune and tuner be removed I have a better chance getting to the bottom of things.


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post #6 of 9 Old 02-09-2014, 04:36 AM Thread Starter
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I didn't realize that the AE would not accurately read icp? I do set a cel when I'm at wot with a tune on. I think it's a po2290, but I've had that since day1 with the tuner. Do you know what ipr% should be at wot on a stock truck? What do you mean by the "PW will be the determining factor?" What is PW?
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post #7 of 9 Old 02-09-2014, 06:03 AM
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Quote:
Originally Posted by LANDCRUISER4X4 View Post
I didn't realize that the AE would not accurately read icp? I do set a cel when I'm at wot with a tune on. I think it's a po2290, but I've had that since day1 with the tuner. Do you know what ipr% should be at wot on a stock truck? What do you mean by the "PW will be the determining factor?" What is PW?
Injector Pulse Width

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post #8 of 9 Old 02-09-2014, 11:21 AM Thread Starter
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How is that measured and seen?
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post #9 of 9 Old 02-09-2014, 11:26 AM
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It's measured in milliseconds but I don't know enough about it to know what is normal with your injectors and tuning.

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