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Old 09-14-2006, 07:45 PM   #76
west_minist
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Quote:
Originally Posted by WolfPlayer View Post
I just wanted to restate that I have done a few more AVCS tests and the difference in boost at WOT in the upper RPMs when running positive AVCS values to redline is significant. I have had to retune my upper RPM WGDCs due to overboosting. Lots of STIs just run maximum WGDCs in the upper RPMs to milk as much boost as possible (because it seems to let off at 15psi anyhow). With increased AVCS settings, I hit 17.5psi at 6400rpms. Yes, I know that I do not want to do this - rofl. Just stating the results of a test. This wasn't boost creep either. I'm talking about boost in 3rd gear and my car has never creeped in 3rd gear (especially in 80+ d weather). I now have to clamp down my WGDCs a lot tighter in order to not overboost (as in the rofl AVCS test with 17.5psi).

t

I will get the STI I am tuning to do that, although I am over 18 near the redline

LOL

What was the setting? 10?

Any logs?
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Last edited by west_minist; 09-14-2006 at 09:50 PM.
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Old 09-14-2006, 09:49 PM   #77
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HAve you done a dyno?

It makes me wonder is the gas flow is slowing done and the car loses power?????
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Old 09-15-2006, 01:01 AM   #78
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Quote:
Originally Posted by WolfPlayer View Post
I just wanted to restate that I have done a few more AVCS tests and the difference in boost at WOT in the upper RPMs when running positive AVCS values to redline is significant. I have had to retune my upper RPM WGDCs due to overboosting. Lots of STIs just run maximum WGDCs in the upper RPMs to milk as much boost as possible (because it seems to let off at 15psi anyhow). With increased AVCS settings, I hit 17.5psi at 6400rpms. Yes, I know that I do not want to do this - rofl. Just stating the results of a test. This wasn't boost creep either. I'm talking about boost in 3rd gear and my car has never creeped in 3rd gear (especially in 80+ d weather). I now have to clamp down my WGDCs a lot tighter in order to not overboost (as in the rofl AVCS test with 17.5psi).

t
Interesting, just did a dyno tune on mine and with WGDCs = 100% from 6000RPM boost still tapered from 18PSI down to 14PSI at redline...I'll give this a try and see if I can hold more boost (VF36 turbo)
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Old 09-15-2006, 08:56 AM   #79
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Quote:
Originally Posted by WolfPlayer View Post
I just wanted to restate that I have done a few more AVCS tests and the difference in boost at WOT in the upper RPMs when running positive AVCS values to redline is significant. I have had to retune my upper RPM WGDCs due to overboosting. Lots of STIs just run maximum WGDCs in the upper RPMs to milk as much boost as possible (because it seems to let off at 15psi anyhow). With increased AVCS settings, I hit 17.5psi at 6400rpms. Yes, I know that I do not want to do this - rofl. Just stating the results of a test. This wasn't boost creep either. I'm talking about boost in 3rd gear and my car has never creeped in 3rd gear (especially in 80+ d weather). I now have to clamp down my WGDCs a lot tighter in order to not overboost (as in the rofl AVCS test with 17.5psi).

t
OK, so the boost went up... did the MAF V go up as well?

If the MAF V *didn't* go up, then I wouldn't do that...
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Old 09-15-2006, 10:01 AM   #80
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Originally Posted by x99percent View Post
If the MAF V *didn't* go up, then I wouldn't do that...
agreed. map means nothing compared to maf.
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Old 09-15-2006, 10:21 AM   #81
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Of course at those levels, MAF doesn't have a lot of resolution. Getting from 4.7 to 4.72 is a decent jump in power. If you can run more boost with consistent timing and AFRs, you might have to resort to doing some pulls using some metric for calculating torque to see if you made more power.
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Old 09-15-2006, 10:49 AM   #82
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Quote:
Originally Posted by WolfPlayer View Post
I just wanted to restate that I have done a few more AVCS tests and the difference in boost at WOT in the upper RPMs when running positive AVCS values to redline is significant. I have had to retune my upper RPM WGDCs due to overboosting. Lots of STIs just run maximum WGDCs in the upper RPMs to milk as much boost as possible (because it seems to let off at 15psi anyhow). With increased AVCS settings, I hit 17.5psi at 6400rpms. Yes, I know that I do not want to do this - rofl. Just stating the results of a test. This wasn't boost creep either. I'm talking about boost in 3rd gear and my car has never creeped in 3rd gear (especially in 80+ d weather). I now have to clamp down my WGDCs a lot tighter in order to not overboost (as in the rofl AVCS test with 17.5psi).

t
Tim-

How did your EGTs compare? I'm wondering if you were getting hotter exhaust gas temps or just more air moving through the motor.

Thanks!
Mike
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Old 09-15-2006, 03:07 PM   #83
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Quote:
Originally Posted by west_minist View Post
HAve you done a dyno?

It makes me wonder is the gas flow is slowing done and the car loses power?????
That is a distinct possibilty. You can't use AFR as a measure of power either with changes to AVCS. If you are effectively raising the compression, you'll see the AFR go rich even though you are producing more torque. You need a dyno, and MAF signals would be a poor substitute.
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Old 09-15-2006, 04:09 PM   #84
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Just tuned an 04 sti.. Downpipe, drop in filter, stock axle back. SMC meth. Other tuners map made 261 and 288ft lbs. Dropped in AVCS map, 278 and 310! No other changes.. Then mapped it out the rest of the way and got 291 and 315ft lbs. 3 pulls into the meth map and I am at 310 and 350ft lbs. Almost done. Got a few bumps in the timing map to smooth... Just took a break to heat Potluck at work!

Not bad on this mustang dyno! Not really going for more.. That stock axle back is really holding her back..

Clark
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Old 09-15-2006, 04:33 PM   #85
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Come on Clark. You're just teasing us folks that don't have a dyno (or even a (good) nearby tuner with a dyno). Just give us some more hints at your magic AVCS details.
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Old 09-15-2006, 05:00 PM   #86
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Clark has earned the right to be a tease.
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Old 09-15-2006, 05:07 PM   #87
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I am scanning the chart now! I got 315whp and 350 range trq on the methenol.. Thats about the highest I have done on this mustang dyno for a basic stock STI. That stock muffler really held this thing back. Prob could have made 320 and 380 if he had a muffler but he does not want the noise..

Clark
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Old 09-15-2006, 05:48 PM   #88
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Old 09-15-2006, 07:36 PM   #89
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Default 1999/2000 Late GC8 Impreza STI w/ AVCS

One of my friend recently got a 2000 GC8 Impreza STI w/ AVCS. This engine is similar in parts to the STI 2001 bugeye.

Have anyone came across a vehicle like this?

Is the ECU the same a a 2001?

I haven't ask him to look @ the ecu because he is a strange guy.
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Old 09-15-2006, 07:48 PM   #90
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I have passed on a conservative AVCS map to the sti owner for test. I will wait and see what he has to say.

My only other option is a JDM wrx w/ serious low boost issues becuase of the actuator needs testing.
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Old 09-17-2006, 09:03 AM   #91
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Quote:
Originally Posted by x99percent View Post
OK, so the boost went up... did the MAF V go up as well?

If the MAF V *didn't* go up, then I wouldn't do that...
You need ro read my previous post. You aren't telling me anything I don't know.

t
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Old 09-17-2006, 10:29 AM   #92
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Quote:
Originally Posted by west_minist View Post
One of my friend recently got a 2000 GC8 Impreza STI w/ AVCS. This engine is similar in parts to the STI 2001 bugeye.

Have anyone came across a vehicle like this?

Is the ECU the same a a 2001?

I haven't ask him to look @ the ecu because he is a strange guy.
Off the top of my head I would say no. One ECU (2001) has 5 plugs and the other 3 plugs. I'd also consider that at that time the AVCS may have been a open-loop system.
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Old 09-17-2006, 10:35 AM   #93
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Super duper AVCS......I'll have to remember that. If Clark posts his map, please be careful.

Clark have you ever heard the pfft,pfft,pfft sound at low RPM when the oil pressure is still pretty low? I'm not tuning anything until I get this noise figured out.
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Old 09-17-2006, 10:39 AM   #94
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Quote:
Originally Posted by bboy View Post
Super duper AVCS......I'll have to remember that. If Clark posts his map, please be careful.

Clark have you ever heard the pfft,pfft,pfft sound at low RPM when the oil pressure is still pretty low? I'm not tuning anything until I get this noise figured out.
I have heard it on my car...dunno what it is but seemed related to low rpm, elevated WG duty cycle for me....
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Old 09-17-2006, 10:49 AM   #95
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Originally Posted by bboy View Post
Off the top of my head I would say no. One ECU (2001) has 5 plugs and the other 3 plugs. I'd also consider that at that time the AVCS may have been a open-loop system.
I think he told me 5, but it is not like mine that is 3 connects that date back to 1996 ECU. This very strange on Subaru part, but hey, Subaru is strange.
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Old 09-20-2006, 05:27 AM   #96
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Quote:
Originally Posted by WolfPlayer View Post
I just wanted to restate that I have done a few more AVCS tests and the difference in boost at WOT in the upper RPMs when running positive AVCS values to redline is significant. I have had to retune my upper RPM WGDCs due to overboosting. Lots of STIs just run maximum WGDCs in the upper RPMs to milk as much boost as possible (because it seems to let off at 15psi anyhow). With increased AVCS settings, I hit 17.5psi at 6400rpms. Yes, I know that I do not want to do this - rofl. Just stating the results of a test. This wasn't boost creep either. I'm talking about boost in 3rd gear and my car has never creeped in 3rd gear (especially in 80+ d weather). I now have to clamp down my WGDCs a lot tighter in order to not overboost (as in the rofl AVCS test with 17.5psi).
I too have been able to increase boost at high RPMs...

No Advance:


Full Advance:


Note that in both graphs, WG duty cycles are at 100% from 6000RPM onwards. With little or no advance, you can see boost drops past 6000RPM. With full advance (40 degrees), boost actually increases to the point we can run 19PSI @ 7000RPM vs 16PSI @7000RPM with no advance. The car definitely felt weaker with more boost and full advance but you can see the AFRs richen up (fuel for the higher boost load sites has not been previously tuned as we haven't been able to reach those boost levels previously)...
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Old 09-20-2006, 07:33 AM   #97
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Man I wished I did not read this thread.. Okay here goes.. Some uestions for phil and who ever has the info..

1. 02 wrx hydra what does your avcs map look like, beter yet what block heads cams did you use to create it.. Reason I ask is I have ver 8 heads.. that are capable of 40 deg of advance, have a diffrent cam profile then jdm wrx, ver7. and are bolted to a usdm 2.5 block

2. Also is there a way to see the cam advance physicly.. since the hydra can only do open loop.. maybe build a circuit and attach to the cam sensors. wich are used only to plug the holes in the heads?..

3. Now that tuners have found power and can duplicate it will you unlock the map for end users and tunners.. power to the people

Thanks for this great thread.. Phil this is not intended to drag you out into the open. sorry for all the spelling errors..

thanks george.
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Old 09-20-2006, 07:38 AM   #98
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Quote:
Originally Posted by Sparcomx View Post
Man I wished I did not read this thread.. Okay here goes.. Some uestions for phil and who ever has the info..

1. 02 wrx hydra what does your avcs map look like, beter yet what block heads cams did you use to create it.. Reason I ask is I have ver 8 heads.. that are capable of 40 deg of advance, have a diffrent cam profile then jdm wrx, ver7. and are bolted to a usdm 2.5 block

2. Also is there a way to see the cam advance physicly.. since the hydra can only do open loop.. maybe build a circuit and attach to the cam sensors. wich are used only to plug the holes in the heads?..

3. Now that tuners have found power and can duplicate it will you unlock the map for end users and tunners.. power to the people

Thanks for this great thread.. Phil this is not intended to drag you out into the open. sorry for all the spelling errors..

thanks george.
Hydra can only do open loop cam control?? How the how could you even hope to control the cams, given the large variances in oil pressure seen in an engine...
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Old 09-20-2006, 07:47 AM   #99
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Quote:
Originally Posted by WolfPlayer View Post
I just wanted to restate that I have done a few more AVCS tests and the difference in boost at WOT in the upper RPMs when running positive AVCS values to redline is significant. I have had to retune my upper RPM WGDCs due to overboosting. Lots of STIs just run maximum WGDCs in the upper RPMs to milk as much boost as possible (because it seems to let off at 15psi anyhow). With increased AVCS settings, I hit 17.5psi at 6400rpms. Yes, I know that I do not want to do this - rofl. Just stating the results of a test. This wasn't boost creep either. I'm talking about boost in 3rd gear and my car has never creeped in 3rd gear (especially in 80+ d weather). I now have to clamp down my WGDCs a lot tighter in order to not overboost (as in the rofl AVCS test with 17.5psi).

t
Sounds like all you did was destroy the VE. Boost is just a restriction.

TMS
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Old 09-20-2006, 10:41 AM   #100
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Originally Posted by STI8U View Post
Hydra can only do open loop cam control?? How the how could you even hope to control the cams, given the large variances in oil pressure seen in an engine...
The STi Hydra has closed-loop AVCS control.
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