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Old 03-25-2008, 11:06 PM   #1
arch4life
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Default Tuning my WGDC, is my turbo dead?

Hello all, been lurking and reading and doing a lot of work understanding what im looking at in terms of a log, and what values i should expect to see.

I have a 2004 sti, essentially, and im currently trying to tune for the car to hit boost targets for an open source stage 2 tune.

mods:

SPT intake
gt spec headers
up pipe
TBE 3inch
Turbo XS FMIC

i just recently installed a GM Boost control solenoid, after wondering why i was not hitting stock boost targets, or stage 2 boost targets.

i have had to increase the WGDC (waste gate duty cycle) up near 75% to achieve target boost in the midrange. Despite this high and steady WGDC, the boost seen in the higher rpm's is tapering off down to 12.

boost targets are 18 tapering to 16 after about 5.5k-7.

here is the log: ( if anyone could tell me how to paste this as text in its own little box i'd love it)







is the turbo just unable to maintain the boost? what should i check? thoughts? Also, i do have a lower uppipe leak. working on fixing that soon, i dont think however that it is large enough to create this kind of boost loss. keep in mind this is the GM BCS, so 75% is quite high for 18 psi peak.
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Last edited by arch4life; 03-25-2008 at 11:32 PM.
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Old 03-25-2008, 11:38 PM   #2
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Use the "code" function to paste into it's own text box.

Well, those WGDC's aren't that high for pushing that much boost. Every car is different, and I've found that most cars like right around 60% WGDC with that GMBCS, but some simply require more and some less.

Second -- it looks like you're maxing out your injectors up top. I'm not sure I would suggest turning up the boost up there in the first place.

Third -- you're right, you should be able to make more boost up top, however, it seems obvious that you need to run more WGDC up there to run more boost, as the VF39 still does taper off quickly up top.
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Old 03-26-2008, 12:02 AM   #3
arch4life
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, i havent adjusted the AFR's yet up top, its still very rich, in the 10.5:1 range as registered by my innovate LC-1 wideband.

so there is room to play with in terms of injector duty cycle, but that will be sorted after i make boost. ( i always watch that wideband )

as far as needing more WGDC up top, i am not sure i have seen someone adding more WGDC when boost should taper down up top. I believe i had always seen the wgdc falling as boost targets decreased.

Last edited by arch4life; 03-26-2008 at 12:55 AM.
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Old 03-26-2008, 12:22 AM   #4
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I've seen some cars needing more wgdc more than others, even with the boost solenoid, it required much more than others did.
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Old 03-26-2008, 12:56 AM   #5
arch4life
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interesting. over on rom raiders someone suggested that the up pipe leak could cause this to occur more noticibly at the higher rpms because of the large backpressure caused by the turbo. thoughts?
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Old 03-26-2008, 01:13 AM   #6
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That can be also, check for leaks.
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Old 03-26-2008, 01:26 AM   #7
arch4life
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well i know the leak exists, i said so in the first post i believe it is leaking at idle. i guess it would be leaking a fair amount more on boost
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Old 03-26-2008, 09:59 AM   #8
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Why is the IAM 1?
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Old 03-26-2008, 10:12 AM   #9
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04 sti, 32 bit ecu's have IAM 0-1 while 16 bit ecu's have IAM 0-16 i believe.
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Old 03-26-2008, 12:29 PM   #10
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Yea.. you need more WGDC in the low end, and top end... Start with 80-90 and you'll spool up faster, taper back down in the midrange, then slowly taper up towards redline, again near 80-90.
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Old 03-26-2008, 12:46 PM   #11
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Thanks arch for the clarification
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Old 03-26-2008, 01:13 PM   #12
arch4life
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so running 80-90 wgdc on a GM BCS is normal? this confuses me. it goes against everything i'd read about how much more efficient the GM BCS is over the stock bleeder type BCS.
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Old 03-26-2008, 01:44 PM   #13
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Quote:
Originally Posted by fujiillin View Post
Yea.. you need more WGDC in the low end, and top end... Start with 80-90 and you'll spool up faster, taper back down in the midrange, then slowly taper up towards redline, again near 80-90.
Exactly.

Quote:
Originally Posted by arch4life View Post
so running 80-90 wgdc on a GM BCS is normal? this confuses me. it goes against everything i'd read about how much more efficient the GM BCS is over the stock bleeder type BCS.
The point is you're running the turbo at max capacity. You are trying to push the turbo to the limits of what it wants to run up in the high RPM range. Below are my graphs from my 06 WRX w/ GMBCS. The TD04 tapers even more then the VF39.



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Old 03-26-2008, 02:45 PM   #14
arch4life
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wow, thanks for the graphs! i guess its true that car to car wgdc varies alot, and if i am running the turbo at the upper end of the efficiency range, i need wgdc to keep it up top. i guess i need to make some more changes to my wastegate duty cycle maps. we'll see how that goes.


after looking at the stock boost/ wastegate maps, it looks like im requiring more wastegate than the stock needs up top. AND im not hitting the same #'s as the stock map in terms of boost targets, its only hitting 12 when the stock map is at 14.

is there that much variance between cars that i would need alot more wgdc to hit the stock boost targets up top let alone the stage 2 boost targets?
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Old 03-26-2008, 04:43 PM   #15
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Quote:
Originally Posted by arch4life View Post
wow, thanks for the graphs! i guess its true that car to car wgdc varies alot, and if i am running the turbo at the upper end of the efficiency range, i need wgdc to keep it up top. i guess i need to make some more changes to my wastegate duty cycle maps. we'll see how that goes.


after looking at the stock boost/ wastegate maps, it looks like im requiring more wastegate than the stock needs up top. AND im not hitting the same #'s as the stock map in terms of boost targets, its only hitting 12 when the stock map is at 14.

is there that much variance between cars that i would need alot more wgdc to hit the stock boost targets up top let alone the stage 2 boost targets?
That could be attributed to the uppipe leak.
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