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Old 06-14-2012, 09:46 PM   #1
chemtek
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Default 2008 datalog pulls

Looking for a little tech help.

This first log was done with the cobbs stage1 91 octane 2008 wrx map. I reach the max boost of 13psi but it tapers well below the 9 psi threshold at red line down to 7.78psi.

https://docs.google.com/spreadsheet/...WpXT1A1b3lYdFE


This second log was after I flashed Perrins stage1 91 octane map. I'm within 1 psi of the target max boost of 16psi but again well below the projected red line boost. Not sure why my boost level don't hold higher until redline. Any ideas? I understand the TD04 is not the most efficient turbo but.... I also have an Invidia Q300 catback and stock downpipe.

https://docs.google.com/spreadsheet/...0FPSVQ5cHBVemc

I'm a total newbie to the tuning world but from what I understand, everything else looks fine with the pull. I contacted Perrin and they say numbers look fine.

Thanks
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Old 06-15-2012, 09:45 AM   #2
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Originally Posted by chemtek View Post
Looking for a little tech help.

This first log was done with the cobbs stage1 91 octane 2008 wrx map. I reach the max boost of 13psi but it tapers well below the 9 psi threshold at red line down to 7.78psi.

https://docs.google.com/spreadsheet/...WpXT1A1b3lYdFE


This second log was after I flashed Perrins stage1 91 octane map. I'm within 1 psi of the target max boost of 16psi but again well below the projected red line boost. Not sure why my boost level don't hold higher until redline. Any ideas? I understand the TD04 is not the most efficient turbo but.... I also have an Invidia Q300 catback and stock downpipe.

https://docs.google.com/spreadsheet/...0FPSVQ5cHBVemc

I'm a total newbie to the tuning world but from what I understand, everything else looks fine with the pull. I contacted Perrin and they say numbers look fine.

Thanks
As far as our OTS map, you are definitely underboosting and could benefit from the high wastegate (HWG) version of your map. This can be found in the maps section at the cobbtuning.com site (use the AccessPORT Manager software to transfer the map to your AccessPORT). This is not unusual - just a case of different cars responding differently.

As far as the Perrin map, it would be best to contact them (as you already have) as they would know exactly how the map should respond based on what they intended in the tune.

Bill
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Old 06-15-2012, 10:34 AM   #3
chemtek
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Thanks for responding so quickly Bill.

Just so I understand correctly... Regarding the under boost, the HWG map will correct the boost taper and hold better untill red line? Will this map not affect my max boost level?

One more question I have is what is the relation of the the TD boost error to boost levels?

Tonight I will try out the HWG map and see how my car reacts.

Thanks
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Old 06-15-2012, 11:40 AM   #4
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Had a question about g/s, but I answered it myself :]

Last edited by jonthesloth; 06-15-2012 at 11:50 AM.
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Old 06-15-2012, 08:34 PM   #5
chemtek
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This log is the Cobb stage1 91 octane HWG map. My max boost is higher and my red line boost level is a tad higher, but still under 8. Should I be content with these numbers and carry on? I have a catted Cobbs downpipe I want to install (stage2) but wanna make sure everything is as it should be stage 1.

https://docs.google.com/spreadsheet/...3SjVvYkE#gid=0

thanks in advance
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Old 06-16-2012, 08:02 PM   #6
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Originally Posted by chemtek View Post
This log is the Cobb stage1 91 octane HWG map. My max boost is higher and my red line boost level is a tad higher, but still under 8. Should I be content with these numbers and carry on? I have a catted Cobbs downpipe I want to install (stage2) but wanna make sure everything is as it should be stage 1.

https://docs.google.com/spreadsheet/...3SjVvYkE#gid=0

thanks in advance
Log looks fine -> boost at high RPM can vary quite a bit between cars. Do you happen to be at any significant altitude? Regardless, you are good to go for stage 2. Get some additional logs then as well.

Bill
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Old 06-17-2012, 10:41 PM   #7
chemtek
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disregard this post and read #8. Not sure how to delete message yet.

Last edited by chemtek; 06-17-2012 at 10:47 PM. Reason: please disregard this post
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Old 06-17-2012, 10:42 PM   #8
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Quote:
Originally Posted by Cobb Tuning View Post
Log looks fine -> boost at high RPM can vary quite a bit between cars. Do you happen to be at any significant altitude? Regardless, you are good to go for stage 2. Get some additional logs then as well.

Bill

My altitude is 2192ft (Edmonton, Alberta)

Thank you again Bill. I value the information I receive from you on this site. After I go stage2 if I have any problems, I'll forward them your way. I decided to keep the Cobbs stage1 map on over the Perrin for the next while. Seems my mileage is better with Cobbs.

One more quick question. About a week ago when I started my car, It seems I had a bit of condensation dripping between my Invida 3" midpipe and stock downpipe (exhaust leak). Could this cause boost issues for me? I have a new donut gasket on its way and will use gasket maker when I install my cobbs downpipe.

thanks again
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Old 06-18-2012, 09:24 AM   #9
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Quote:
Originally Posted by chemtek

My altitude is 2192ft (Edmonton, Alberta)

Thank you again Bill. I value the information I receive from you on this site. After I go stage2 if I have any problems, I'll forward them your way. I decided to keep the Cobbs stage1 map on over the Perrin for the next while. Seems my mileage is better with Cobbs.

One more quick question. About a week ago when I started my car, It seems I had a bit of condensation dripping between my Invida 3" midpipe and stock downpipe (exhaust leak). Could this cause boost issues for me? I have a new donut gasket on its way and will use gasket maker when I install my cobbs downpipe.

thanks again
Possibly - it would have to be a severe leak though. Altitude will have a big impact in the boost you will see, especially at high RPM, so this is likely normal.

Bill
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Old 07-27-2012, 12:44 AM   #10
chemtek
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Any idea why I am showing the late fine knock learning in my run? Should I worry about this value since it is not correcting itself? I understand its present from a previous event that has happened but not sure why it shows up and then does not learn itself away.


https://docs.google.com/spreadsheet/...ESVpqRkE#gid=0
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Old 07-27-2012, 09:27 AM   #11
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Originally Posted by chemtek View Post
Any idea why I am showing the late fine knock learning in my run? Should I worry about this value since it is not correcting itself? I understand its present from a previous event that has happened but not sure why it shows up and then does not learn itself away.


https://docs.google.com/spreadsheet/...ESVpqRkE#gid=0
The value is correcting itself as the correction is in steps of -1.4 degrees when dropping (0.35 degrees when ramping back). So, when you see a value of -1.05, that is a correction that has learned back from -1.4 (-1.4 + 0.35). Although, it can take some time for it to start to learn back to zero, so you may see -1.4, etc. in logs even after the event has occurred.

Bill
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Old 07-27-2012, 09:59 AM   #12
chemtek
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Quote:
Originally Posted by Cobb Tuning
The value is correcting itself as the correction is in steps of -1.4 degrees when dropping (0.35 degrees when ramping back). So, when you see a value of -1.05, that is a correction that has learned back from -1.4 (-1.4 + 0.35). Although, it can take some time for it to start to learn back to zero, so you may see -1.4, etc. in logs even after the event has occurred.

Bill
Thank for the quick response Bill. I think I will carry on with my today plans to install my downpipe.
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Old 07-28-2012, 11:23 PM   #13
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So I installed my Cobb catted down pipe and flashed the Cobb stage2 map, drove around a bit, then pulled a log. The numbers look okay regarding boost and knock, does hit target in third. But when I pull on it into forth, viewing my live data, I hit as high as mid 18 psi. Im not at home right now so I cannot post my log, but I never logged my 4th gear so not sure it will be any help.

I never had this problem of hitting such a high psi in above third stage1. Later in the day I flashed my Perrin stage2 map and the boost comes on faster but doesn't hold as well. But I never experienced the boost spike in forth with their map. Could this possible be boost spike even if only 1 map is showing signs?

Thanks in advanced.
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Old 07-29-2012, 01:04 AM   #14
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Quote:
Originally Posted by chemtek
So I installed my Cobb catted down pipe and flashed the Cobb stage2 map, drove around a bit, then pulled a log. The numbers look okay regarding boost and knock, does hit target in third. But when I pull on it into forth, viewing my live data, I hit as high as mid 18 psi. Im not at home right now so I cannot post my log, but I never logged my 4th gear so not sure it will be any help.

I never had this problem of hitting such a high psi in above third stage1. Later in the day I flashed my Perrin stage2 map and the boost comes on faster but doesn't hold as well. But I never experienced the boost spike in forth with their map. Could this possible be boost spike even if only 1 map is showing signs?

Thanks in advanced.
You prob should have started your own thread for this. You kinda just hijacked this one.

There are many factors that could make you have spikes or overboost. You also should have searched that before installing your Downpipe. Start your own thread, post a 3rd gear log, then a 4th gear log (if u can do so safely.) 2 separate logs, one for each gear. Then we can evaluate your car in your own thread.
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Old 07-29-2012, 01:24 AM   #15
chemtek
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Originally Posted by bacalhau16 View Post
You prob should have started your own thread for this. You kinda just hijacked this one.

There are many factors that could make you have spikes or overboost. You also should have searched that before installing your Downpipe. Start your own thread, post a 3rd gear log, then a 4th gear log (if u can do so safely.) 2 separate logs, one for each gear. Then we can evaluate your car in your own thread.
Not sure how I can jack my own thread. Also, assuming you have read the whole thread, you will see that I have logged and posted my logs and have recieved feedback from Bill which has been quite helpful. And yes, I do search search search everyday. Actually quite addicted to it, but I have not seen anywhere that boost creep with a catted downpipe only creeps on 1 map and not another. Thought maybe this was a cobb map thing.

Anyways thanks for the input. And once I get back to my computer, I will post more logs. Oh I will log 4th gear (which I haven't yet done) but not sure I should WOT to redline with it.
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Old 07-29-2012, 10:01 AM   #16
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Originally Posted by chemtek View Post
So I installed my Cobb catted down pipe and flashed the Cobb stage2 map, drove around a bit, then pulled a log. The numbers look okay regarding boost and knock, does hit target in third. But when I pull on it into forth, viewing my live data, I hit as high as mid 18 psi. Im not at home right now so I cannot post my log, but I never logged my 4th gear so not sure it will be any help.

I never had this problem of hitting such a high psi in above third stage1. Later in the day I flashed my Perrin stage2 map and the boost comes on faster but doesn't hold as well. But I never experienced the boost spike in forth with their map. Could this possible be boost spike even if only 1 map is showing signs?

Thanks in advanced.
Adding an aftermarket downpipe is major change that impacts boost control/response as compared to stock (stage 1). It isn't relevant how boost looked at stage 1 (relative to its target) as you can't really compare this at stage 2. Best to just look at stage 2 as an entirely separate case.

We do have low wastegate (LWG) version of the maps available at the cobbtuning.com in the maps section. These would be used in the case of overboosting. It doesn't mean there's anything wrong with your car - each car can respond differently. But, I would first post up the log so we can take a look at it and see if the LWG map is necessary or not.

Bill
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Old 07-29-2012, 12:45 PM   #17
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Sorry, wasn't paying attention I guess to who wrote it. Just noticed that the subject changed.

Just because you got a catted downpipe, it does not guarantee that you will not have spikes. They seem to be less likely with a catted. But from everything I have read, I think it may have more to do with having an aftermarket exhaust more then type of Downpipe.
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Old 07-30-2012, 12:15 AM   #18
chemtek
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I haven't been able to log any pulls in 4th gear where the cobbs map showed a boost spike up to 18 but here is my third gear pull.

https://docs.google.com/spreadsheet/...4c0RFLXc#gid=0

And this is after I reflashed the Perrin stage2 map.

https://docs.google.com/spreadsheet/...IdTJVWmc#gid=0

The Perrin map showed no sign of boost spike in 4th.

Thanks for looking
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Old 07-30-2012, 08:53 AM   #19
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Originally Posted by chemtek View Post
I haven't been able to log any pulls in 4th gear where the cobbs map showed a boost spike up to 18 but here is my third gear pull.

https://docs.google.com/spreadsheet/...4c0RFLXc#gid=0

And this is after I reflashed the Perrin stage2 map.

https://docs.google.com/spreadsheet/...IdTJVWmc#gid=0

The Perrin map showed no sign of boost spike in 4th.

Thanks for looking
I would try to get a log next time you are going WOT in 4th or 5th (if you can do so safely). TD Boost Error will tell you how close you are to your target (negative means you are over the target by the amount, positive means you are under the target by that amount). Generally, you should make sure that you are not over the target by more than about 1 psi in the higher gears. If you are, then I would go to the low wastegate (LWG) map if you are currently on the normal wastegate map.

Bill
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