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Old 08-26-2014, 09:04 PM   #1
Blktrax
Scooby Newbie
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: Havelock, NC
Vehicle:
2002 WRX 213K Mi.
Original Motor and Turbo

Default Trying to determine, tune, single part or worn out engine...

Log; 18.8psi target, afr 11.6 target


This tune is modified by me in Accesstuner

100ft elevation and about 85deg air temp

Compared to other 2002 logs, I can't get MAF G/s more than 225-230...

Car pulls very strong till approx 5500, then it feels like it just runs out of breath.

Off the line or below 4000rpm it pulls like a train... but last drag night best it would pull was 14.3 @ 96.16 with a 2.05 60ft

I've been messing with this since my last dyno run, AFR is consistent to redline 11.2-11.4 on AEM UEGO, right at turbo outlet.

Target boost is 18.8 to redline.

Injector Duty hits 96% at 6700RPM <---- this is what I'm leaning towards once the injectors pass 88% at 5000RPM

No distinguishable boost leaks, pressure tested to 20psi

Compression on the motor warm was 140 +/- 3psi approx 5-6 cycles
Leakdown was 10-12% all cylinders
However it is the original engine and TD04 turbo with 210K miles.


Basicly trying to rule out any other possible adjustments or replaceable parts, before having to build a complete new long block.


Mods:
SPT Intake
Perrin Turbo Inlet
Turbo XS Topmount Intercooler
Cobb DP
Perrin Catback
DW300 Fuel Pump

New OE:
-MAF Sensor
-A/F Sensor
-O2 Sensor
-OE Boost Control Solenoid
-Turbo Vac lines with correct pill -Verified wastegate tension with Manual Hand pump



Thanks for the help in advance.
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Last edited by Blktrax; 09-14-2014 at 07:04 PM.
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Old 08-26-2014, 11:00 PM   #2
fenix-silver
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Member#: 231700
Join Date: Dec 2009
Chapter/Region: MAIC
Location: Central PA
Vehicle:
2004 WRX Wagon
WRB

Default

FYI, I was hitting 105% duty cycle on my stock injectors w/ a stage 2 tune on my 2.0, so 96% shouldn't be a worry. I'm just starting to figure out some of my own tuning, but you may have some luck by posting your map here.
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Old 08-26-2014, 11:21 PM   #3
SkateAndDestroy
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Member#: 133893
Join Date: Dec 2006
Chapter/Region: Tri-State
Location: Red Bank, NJ
Vehicle:
JBP 04 Forester XT
PSM 02 WRX Wagon

Default

Have you had to do maf scaling for the SPT intake? Your maf g/s aren't gonna be comparable to stock intake 02's if you modified the maf scaling for the intake..Also its summer, so maf g/s are gonna be lower this time of year compared to winter...

The amount of boost at redline is all the TD04 has in it, its gonna run out of breath. It seemed like you can get boost out of it in the midrange though, the wastegate duty cycles weren't maxed out til 5100rpm.

Did you log your intake temps at the track? If you were in the staging lanes a long time, the Intake Air Temp. compensation table removed a few degrees of ignition timing taking some power away. Did you also try shifting earlier at the track?
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Old 08-28-2014, 12:15 AM   #4
Blktrax
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Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: Havelock, NC
Vehicle:
2002 WRX 213K Mi.
Original Motor and Turbo

Default

Quote:
Originally Posted by fenix-silver View Post
FYI, I was hitting 105% duty cycle on my stock injectors w/ a stage 2 tune on my 2.0, so 96% shouldn't be a worry. I'm just starting to figure out some of my own tuning, but you may have some luck by posting your map here.
I have never pushed injectors this hard with this many miles , wasn't sure if this is what happens if they go static.

Quote:
Originally Posted by SkateAndDestroy View Post
Have you had to do maf scaling for the SPT intake? Your maf g/s aren't gonna be comparable to stock intake 02's if you modified the maf scaling for the intake..Also its summer, so maf g/s are gonna be lower this time of year compared to winter...

The amount of boost at redline is all the TD04 has in it, its gonna run out of breath. It seemed like you can get boost out of it in the midrange though, the wastegate duty cycles weren't maxed out til 5100rpm.

Did you log your intake temps at the track? If you were in the staging lanes a long time, the Intake Air Temp. compensation table removed a few degrees of ignition timing taking some power away. Did you also try shifting earlier at the track?
Did not modify MAF scale, used the base 3.10 stg 2 93 Oct normal waste gate tune as a base.

Modified waste gate table to mimic the HWG base map, removed a lot of 1/2 to 3/4 throttle boost flucuation.

modified AFR table to dip to 10.6 at CL/OL transition then level off at 11.2 to redline

Air intake temps were approx 110F. I tried not to heat soak too long, but wanted to make sure the oil was up to temp. Ambient temp was 80-85F and humid.
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Old 09-14-2014, 07:04 PM   #5
Blktrax
Scooby Newbie
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: Havelock, NC
Vehicle:
2002 WRX 213K Mi.
Original Motor and Turbo

Default

Log link: 2-3 gear change log, late boost recovery


Map link: Stage2 93oct v116afr 18.8psi

Ok , so after looking at this log again, I see what I think is an issue...

After the gear change and back to 100% throttle position, Wastegate duty takes too long to go back to max open, therefore limiting boost 3-5 psi under target...

Can anyone point me in the right direction of what to modify?

Wastegate duty high = 90.6 @ 100% throttle from 2450 rpm

Wastegate duty Cycles compensation barometric (psi) =

18.8%@12.22psi
9.4%@13.46psi
0%@14.7psi

Turbo dynamics unchanged from v3.10 stg2 93 hwg map

Last edited by Blktrax; 09-14-2014 at 07:10 PM.
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