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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old January 5th, 2018, 05:24   #16
travis45
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Xjay, I appreciate your comments. I'm to the point where I need to eliminate any possible variables.

It must interact on some level as it can do things like mirror dip etc. I have heard that they can go bad and leave you stranded. Also, if the tune was flashed via the ODB port, it's through that device. Could it affect? I don't know? I'm out of ideas except to remove it, recheck all connections and reflash my tune.

Respectfully,
Travis

Again, just want to eliminate any possible variables.
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Old January 5th, 2018, 06:13   #17
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Quote:
Originally Posted by xjay1337 View Post
The Polar FIS can't cause an impact.

All the Polar FIS is, is a way to interact with the onboard systems and display data.
In exactly the same way that VCDS works (that's why if you have a Polar FIS you cannot have the display pages open when you are using VCDS).

Just because you don't get rail p issues in one log doesn't mean the tune is OK.
It could be a hardware or software issue, but I can guarantee the Polar FIS is not causing an issue.
Saturating the CANBUS can certainly cause some wonky stuff. I've seen it on other applications before where so much data was being requested by the CAN logger that it totally screwed up how the engine ran.

This would not be the first time I've personally seen a Polar FIS cause a serious problem.
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Old January 5th, 2018, 08:17   #18
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Didn't get a chance to pull the PolarFIS, but I turned it off (switched to MFI screen) on the way into work today and the car ran without the oscillation.

Not sure if it would have an impact on rail pressure, but since I've installed the first CP3, I've always had the rail pressure displayed on the PolarFIS.

Oh, I hope this is the answer... When running properly and driven hard, it's a one tire fire. Wavetrac is in the mail!
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Old January 5th, 2018, 08:43   #19
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Quote:
Originally Posted by Kevinski4 View Post
Saturating the CANBUS can certainly cause some wonky stuff. I've seen it on other applications before where so much data was being requested by the CAN logger that it totally screwed up how the engine ran.
This would not be the first time I've personally seen a Polar FIS cause a serious problem.
As I said, I have had no issues with Polar FIS. I've had mine installed for 3 years from stock right through to my level of tune now.

When we first installed the CP3 on my car we also had large rail pressure variations (similar to what OP has logged and shown).

Once tuned suitably my rail pressure is very stable and it does not impact whether I have the Polar FIS enabled, disabled or up my butt

It's exactly like running the car with VCDS connected.
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Old January 5th, 2018, 15:33   #20
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Been driving with the PolarFIS turned off and seems to be doing good.

Hard to identify unless I'm driving the car hard and that can make for an interesting ride to work.

Going to pull the PolarFIS, drive more, log and restore my tune to full fuelling early next week.

More info to come in the next few days.

I don't want to jinx it, but all the anecdotal evidence is all pointing to the PolarFIS. It's really too bad, because it is a neat gadget. I think I heard that you can update the firmware. Not sure if that would make a difference or not. Either way, I don't want to use a device that could potentially restrict or interrupt communication amongst the components.

Respectfully,
Travis
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Old January 5th, 2018, 16:15   #21
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Told you polar fis was giving me issues, so i took it down.
VCDS connected to the car also did not work ok with polarfis, communication issues, . I will put it back after i am done, maybe.
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Old January 5th, 2018, 17:01   #22
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Mac, Polar FIS and VCDS will not work simultaneously.

All you need to do is tab off the Polar screen on the MFD.

It's like accessing databases .... only so many connections allowed.

You can update the Firmware yes. If you haven't done so I'd probably try that.
If it is giving you issues then it's due to a FAULTY unit.
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Old January 5th, 2018, 23:52   #23
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Good to know, i will try to update it although i got it 1 year ago, maybe not that old FW.
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Old January 6th, 2018, 12:49   #24
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Well, back to the drawing board...

Removed PolarFIS this morning and went for a ride. Here is a snip from the log..



The oscillation was there just about every time, but I did capture one pull without the oscillation. Then after I stopped the log, and turned off VCDS, I did have one nice smooth pull.

PolarFIS has been ruled out. I did unplug the metering valve and it appears okay. When in installed the new plug I may have the wires crossed? Could that create an issue? You wouldn't think it would be intermittent though...

Must be a bad connection or broken wire?

Damn this is infuriating... any thoughts appreciated.

Travis
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Last edited by travis45; January 6th, 2018 at 13:01.
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Old January 9th, 2018, 06:12   #25
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I had the same problem with that pump. I installed a new! valve (Bosch) on that pump and from this point i had no more oscillations.
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Old January 9th, 2018, 07:45   #26
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I've literally tried 3 different genuine Bosch metering valves. Two used and one brand new.

Thing that gets me is that sometimes it works perfectly. Mostly it does not.

HamBam, were your oscillations only at wide open throttle like mine or was it in a greater range?

Thank you for your comments.

Travis
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Old January 9th, 2018, 08:04   #27
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Do I need to suggest the tune again?

I had an issue on a test tune on my stock CP4 pump
Pushing big IQ to see how far the stock pump would go.

If I drove normally, it was fine, and flat out -

If I drove at a steady 2000rpm for a few seconds, in 2nd gear and then accelerated, I would get low rail P.
If I avoided doing that particular "thing" it would be fine.

I suspect you have an issue in your tune, but the particular parameters that are required for it to fail are not being achieved every time.
This is where simply asking on a Forum for help is not a good idea. You need to work with a trusted tuner if possible.

If Malone did your tune and they are not in a location that you can drop the car off they should be asking you to log using VCDS, and give them data.
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Old January 9th, 2018, 08:15   #28
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Yes, tune is next. Malone has been assisting and we will be de-tuning to stock w/deletes to verify tune is not the issue.

But Xjay, if tune is the issue, then why does everyone else with the same hardware and identical tune have no issues?

I have been logging and sending them my logs. Mostly group 21. Can you suggest any other groups to log that would explain the situation better?

Respectfully,
Travis
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Old January 9th, 2018, 09:31   #29
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Quote:
Originally Posted by travis45 View Post
Yes, tune is next. Malone has been assisting and we will be de-tuning to stock w/deletes to verify tune is not the issue.

But Xjay, if tune is the issue, then why does everyone else with the same hardware and identical tune have no issues?

I have been logging and sending them my logs. Mostly group 21. Can you suggest any other groups to log that would explain the situation better?

Respectfully,
Travis
If you dig a little deeper, there are many people with various CP3 kits running into issues, especially if they are tuned. I know personally of 4 cars in Europe with rail pressure problems on cp3 kit.

And even so, every tune is (or should be) different. So there could be many things different between two tuned cars. Maybe some cars have minor nuances due to old hardware/injectors/lift pump that can cause slightly different results.

I think it's the tune. Malone can assist , I'm sure.
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Old January 9th, 2018, 20:48   #30
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Took another log tonight which includes the control deviation from group 19. Not sure if it sheds any light on how to pinpoint the tuning tweeks or not. But it is some more data. It looks to me like the over pressurization of the rail occurs first, and then there is an overcompensation which leads to the oscillation...



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