RomRaider

Hi Guys, great thread! First post, and completely new to tuning. I picked up my first WRX MY08 about three weeks ago and have been looking forward to learning more about it's potential. I've flashed Helix's July11b Stage 1 map, and it appears to have more power over a broader range, which is great! I also copied in my own MAF sensor scaling table.

I did a 3rd gear pull WOT, and logged it. I was wondering if someone might be able to have a look at the log? There are now some high negative numbers in A/F Learning #1, and boost seems pretty high (1.96bar/28psi? @ 2300rpm). My car is completely stock (even air filter), running 98 Octane fuel. I live and drive about 600m above sea level and it's below 15C here most days at the moment.

Thanks.

Boost is absolute so 1.96 is about 14psi ambient

Your log is quite hard to read when graphing, as there are lots of rows missing? ie rpm jumps from 2498 to 2917 over one row.


Have you removed some? If not then reduce the number of columns that you are logging, ie IAM, Injector DC to get better resolution.

was just wondering what can hold a TD04 back from making boost? I'm having difficulty exceed 16 psi on a stage 2 08 WRX (cobb intake + invidia catted turboback) with this map. Previously I have had success in hitting 17.5 psi with only 60-65% WGDC% on 06-07 wrx.

In attached log i'm only hitting 15.7 psi with higher WGDC. I'm wondering if there is something in turbo dynamics that can be tweaked?

I experienced the same when I tuned an 08 wrx with an invidia catted down-pipe. He later came back for a retune with an invidia catless dp and wastegate duty had to be reduced dramatically. As far as I know that was the only thing changed that could have been a limiting factor, unless he messed with the wastegate arm and didn't tell me about it.

Hey guys!
Another noob with an 08 WRX here.

First of all i'd like to thank helix for sharing his work here, it's been very helpful and i've been using it as a reference all the time!

I've been messing around with my ECU for about half a year now, learning most of the stuff on here and through the Tuning Guide. (Awesome stuff!)
My hardware is all stock, so i'm doing "stage 1" if i'm not mistaken.
In essence i have tuned Timing, Boost, but almost no AFR yet, for 100 RON.

Now, my question(s):
Does anyone on here have long-term experience with stage 1?
Broken anything?
How hard is 1 bar of boost (15psi?) on the stock TD04?

Thanks in advance!

I don't have long term experience with Stage 1, since I swapped out my stock exhaust a few weeks after getting my MY08. However, I ran between 16-18psi on my TD04 for months and I recently checked the fins etc and there was very little play. To me, it seemed to handle it fine.

Theoretically, it should handle up to 20psi easily according to the TD04-13T compressor map. So 15 should be fine.

I recently had a problem with advancing timing too far, and I believe a knock sensor that was not reporting knock. Needless to say, my engine grenaded (cyl #4). When I took it apart, #4 piston was in half.

I didn't have a Wideband, which may have saved the day. Hopefully you do.

The up-side is that I've just dropped a 2012 WRX engine in, complete with IHI VF52. I'm using Helix's 1st Stage 3 map, and all seems well. I've been pretty gentle and haven't done any logging yet. I'm waiting on delivery of a Wideband, so will start logging/tuning after that.

Good luck with your tuning.

Thanks for your response OzRex08!


Oh, well, that does sound worrying. As i think i have my timing pretty advanced as well.
You didn't have knocks reported?


Unfortunately i don't. That's one of the main reasons i didn't do much to the AFR tables, hugely relying on a "no knock, no problem" strategy for boost and timing.
Should i reconsider?


That does sound like an upgrade.
Have fun with your new machine!

That was the way I was treating it as well, no knock = no problem. But, that is not necessarily true as I found out!

I was expecting that the IAM would have been reduced if there was a problem, that did not happen... nor were there any CEL's.

The only warning I had was a kind of "Ffft, ffft, ffft" sound with some loss of power, then bang!

If I had my time again, I would have kept the timings found in Helix's maps... Unfortunately, I decided to try an XPT-derived map that was given to me. The timing must have been taken from an STI - too much.

Cheers

Did you monitor your FBKC and FLKC values?
I did have some pretty large corrections there at times (-4.22 FLKC in some cells, see LVs attached, and as high as -8 FBKC occasionally), without the IAM ever doing anything. Actually, i've never seen IAM go down at all. Yet.
I believe IAM only drops if there is continuous knock over a broader rpm/load range, simply speaking. Not necessarily if there is huge knock in some isolated areas, as it's been the case for me.
I've tuned those out continuously, so i'm now in a state where i only have occasional -1.4 FBKC mostly on throttle-lift or at low loads, and no FLKC. So i hoped i would be pretty safe.

Hello, nice to meet you all!

I own a JDM 2008 Subaru S-GT 4EAT (which is same us USDM WRX but with 250BHP stock).

The car is bone stock except the HKS panel filter, here is my log data.

Please kindly take a look and make some comment, thanks!

oh, one more thing, according from my data log am i getting 15psi boost?

Thanks in advance
Steven

Welcome Steven!

I've had a look at your logs, but i can't really give helpful feedback as your car is quite different from 2008 WRXes. We've got different engines (2.5L vs. 2.0L), besides a possibly different turbocharger, and the gearbox.

I can see you don't seem to have knock in that pull, which is good.
Considering the smaller displacement in your engine, and assuming a similar turbocharger, it makes sense to me that you're able to reach higher boost in stock form. You have to actually, to get more power out of a smaller engine.

So, nothing really useful to add here. Maybe some others have experience with S-GTs, but to find those people, it could make sense to open your own thread for this, because imho it's a different kind of beast.

Have fun!

Hi Underbraker,

Nice to meet you, i think in JDM subaru SGT is using a vf47 turbo as stock.

I'm totally new with this, mind to tell me am i running peak boost at 15psi or lower?

Thanks in advance.
Steven

Have fun!

Well, i remember your Mainfold Relative Pressure peaking somewhere at 16.5 psi or so at high revs.
What's it supposed to have?

I just flash to stage 1 with target boost of 17psi. I did another data log today, i wonder am i have any knock?

Please see attached file and thanks in advance