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Old 05-04-2013, 11:12 AM   #51
rhinogt
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Lol I wish that was the case with the breaks. But unfortunately the were just checked yesterday when my new tires were put on. Yea I'm waiting on one of the local guys to come help me do the comp leak down test.
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Old 05-04-2013, 12:04 PM   #52
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You're the original owner right? The compression test can be done quickly, but I really don't think the motor is toast yet. Maybe I'm just being optimistic.

Stored AF learning#s- didn't see those in a post but I haven't looked at the above log yet.

Boost leak: 3700rpm is almost 20g type spool.

Smoke at takeoff- could still be turbo! Yeah it could also be blowby or worse, but start at the little things and work your way up.

Been keeping vdyno up to date?

If you're smoke at takeoff is from normal driving, log the o2 sensor. If it's coming from the motor afr should go crazy.
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Old 05-04-2013, 12:44 PM   #53
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On the VD I've only had it got a couple weeks and I looked on there website and its the most current version still.

The smoke really was only when I came to a stop and was idling waiting for a gate to open. Yes I'm the original owner. I apologize to everyone for not being a romraider guru yet. I haven't done any low load logging on the latest revision yet because it was mainly for the wot part of the tune. But I will and ill post them. The car is hitting 19-20 psi by 3400 now but I guess it could just be pushing the turbo harder to make up for a leak.

I'm with you on trying all the small stuff first but I'm preparing myself for the worst at the same time.
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Old 05-04-2013, 12:54 PM   #54
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Don't know if you looked at the Excel file I made yet, but when you do pay attention to the oscillations you have from ~3000 to ~4000 RPM. They seem pretty bad. Look at load values, they are all over the place. You might want to mention that to your tuner.
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Old 05-04-2013, 01:02 PM   #55
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Quote:
Originally Posted by rhinogt View Post
The car is hitting 19-20 psi by 3400 now but I guess it could just be pushing the turbo harder to make up for a leak.
Yes and no, if you haven't reset the ecu it could have learned more WGDC but it can't provide more than the map tables allow for.
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Old 05-04-2013, 01:26 PM   #56
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I just did and you right it does go all over the place. Ill mention it to him Monday. Any Idea what would cause that? Is it the tune or is the ecu trying to compensate for something?

Ogboot, I reset the ecu every time I load a new map. The last time was on Thursday.
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Old 05-04-2013, 03:18 PM   #57
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Originally Posted by rhinogt View Post
I just did and you right it does go all over the place. Ill mention it to him Monday. Any Idea what would cause that? Is it the tune or is the ecu trying to compensate for something?
At a flow limit for the turbo, maybe?

I plotted your logs on the compressor flow map [at least as good as we have for a RHF55 setup]. Although it is certainly not a perfect flow map [or perfect data], your logs do not show that you were on the surge line or choke line for the turbo at the time. Your logs do show a small oscillation in boost pressure, but that is coming from after the intake side of the TB and it is a good bit off from what is actually at the turbo outlet. The compressor map PR is really between the absolute pressure at the turbo outlet divided by the absolute pressure at the turbo inlet. The turbo inlet is not at ATM pressure, but we use that as an approximation since there is no sensor at the turbo inlet. Also, we know that there is a pressure drop between the turbo outlet and the TB where boost is sensed. It is possible that the PR/airflow combination the turbo really has when the oscillations are occurring is on the choke line. It is also possible that the PR/airflow combination the turbo really has when the oscillations are occurring is on the surge line. Either condition will lead to unstable operation and could easily be the cause.

The way to test this is to lower boost in the affected RPM range to see if the oscillations go away. That will move you away from the surge/choke line and smooth that area out, if that is the problem.

This should not cause the loss of power that you are experiencing, but it is not healthy for your turbo or your engine.

Pardon the estimation at the compressor map, but I can see on the graph how it seems to line up close enough that it is highly possible. I know the higher flow areas do not line up well, but remember IHI does not release useful compressor maps for their turbos. The red line is the approximation for the compressor map surge/choke line, the blue line is straight from the logs and the green line has 3 psi added to boost to account for the pressure drop in the intercooler and 0.5 psi vacuum added to ATM pressure to account for the lower pressure at the turbo inlet. Those numbers may not be accurate, but they seem very reasonable. Here is the graph.


Last edited by jebjkey; 05-04-2013 at 03:26 PM.
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Old 05-04-2013, 03:27 PM   #58
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Here is the exact same graph for the "before" log, looks much better.

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Old 05-04-2013, 03:59 PM   #59
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Thank you for that thorough and understandable explanation. I will talk to him about that as well Monday. That makes more sense about the fluttering whistle then too. Cause it happens in that rpm range and it has only happened in the last couple tune revisions when he upped the boost.
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Old 05-06-2013, 06:41 PM   #60
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Old 05-07-2013, 09:13 AM   #61
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Yeah you are getting some boost fluctations that are effecting your load pretty largely. But to be honest you are still flowing 290 g/s so if you are on stock intake that is pretty good airflow on the top end(for the vf52).
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Old 05-07-2013, 02:17 PM   #62
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Well I found a boost leak today. The rear bolt off the turbo was getting stripped out under higher boost. I replaced it with a longer bolt and a nut so I'll see if it helps.
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Old 05-07-2013, 03:38 PM   #63
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Are you talking on the intercooler? That would explain your fluctuations in boost.
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Old 05-07-2013, 03:45 PM   #64
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Yes if I still had the stock TMIC it would be one of the two bolts mating the turbo to the intercooler. I have a front mount now so it's just piping but same effect.
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Old 05-07-2013, 08:24 PM   #65
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Ok so that fixed it. The car is back up to power. Eric has to make a couple revisions now that it's running differently but it's good now.
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Old 05-08-2013, 12:09 AM   #66
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Hell yeah!!!!

Edit: gotta ask, have you narrowed down what was smoking? Coming from an older subie, it might be something as simple as PCV system.

Last edited by ogboot; 05-08-2013 at 10:07 AM.
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Old 05-09-2013, 08:24 AM   #67
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Amazing. I could have sworn I said look for the boost leak like 4 pages ago. Glad you got it all set :-)
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Old 05-14-2013, 05:09 PM   #68
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Quote:
Originally Posted by ogboot View Post
Think real hard....
Lol, so in the end it was a boost leak. I told OP it was... You on the other hand are indeed still an idiot.
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Old 05-14-2013, 06:04 PM   #69
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Lol, so in the end it was a boost leak. I told OP it was... You on the other hand are indeed still an idiot.
Jesus, you bumped this thread to post that? Look at one of my first posts in here, I stated that he was getting 20G spool. And, re-read the post you got all butt-hurt about... nowhere did I actually question anyone's tuning ability. I was merely stating that if he was lost he needed to take it to someone rather than trying to diagnose it over the internet. Luckily it all turned out for the best.

The only reason I came back was to check for the OP, he stated he was getting puffs of smoke from a light and I suggested that coming from an older subie it could be something simple like the PCV system. There were people in here suggesting compression and leakdown for pete's sake, where's your derogatory crusade against them?
I thought people from Canada were supposed to be nice, i've had good experiences to date but you sure do break the mold. OP's not coming back and I'm certainly not going to check this thread. If you have anything more to say, such as more name calling, just take it to PM. I can't wait.
Good day.
Sorry to clutter your thread OP.
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