AP Stage 1 Club // Links section added to 1st Post - Page 3

Peleg · 05-02-2006, 08:21 AM

Quote:

Originally Posted by wdb

According to wikipedia: All of the signals in an ECU are digital (as you might expect, seeing that it is a 'pooter). The ECU controls valve-style devices such as fuel injectors and the turbo's wastegate by sending pulsed signals to them. The length of time that the pulse is high (or low, depending on how its target device is actuated) is called its duty cycle. A higher duty cycle means the signal is high (or low) for a longer period, and a lower duty cycle means the opposite.

Knowing all of that: Cobb's acronym LWG stands for low wastegate duty cycle, which means that the map sends a shorter duration pulse from the ECU to the wastegate actuator. That in turn allows the wastegate to bleed off more exhaust gas, which reduces maximum boost.

Excellent!

VetteVert · 05-03-2006, 03:58 AM

Quote:

Originally Posted by wdb

According to wikipedia: All of the signals in an ECU are digital (as you might expect, seeing that it is a 'pooter). The ECU controls valve-style devices such as fuel injectors and the turbo's wastegate by sending pulsed signals to them. The length of time that the pulse is high (or low, depending on how its target device is actuated) is called its duty cycle. A higher duty cycle means the signal is high (or low) for a longer period, and a lower duty cycle means the opposite.

Knowing all of that: Cobb's acronym LWG stands for low wastegate duty cycle, which means that the map sends a shorter duration pulse from the ECU to the wastegate actuator. That in turn allows the wastegate to bleed off more exhaust gas, which reduces maximum boost.

This isn't completely correct. You are merging two components and their terminology. The wastegate actuator on our cars could be called a valve type device like you say, but it is controlled by boost pressure. When the boost pressure overcomes the wastegate spring, it pushes an "arm" attached to the wastegate door, opening it. The boost control solenoid is Tee'd off of the hose from the compressor outlet to the wastegate actuator. This solenoid is what has the duty cycle (as it is electronically controlled from the ECU), and bleeds off enough boost to keep the actuator from opening the door until target boost is reached...it then moderates the pressure to retain that boost (often causing the wastegate door to open/close rapidly...called wastegate flutter). Cobb calls their maps HWG and LWG in reference to the duty cycle (just as you say), but this is because of what the fields are called in the maps, not because the wastegate actually has a duty cycle. All the ECU controlls is the boost control soledoid....

Just wanted to give all the details I could...

VV

RumblingREX · 05-03-2006, 08:59 AM

Installed Stg1 93 Octane map last night. I agree, not too much of a noticeable difference. I did confirm that my Autometer Electronic Boost gauge was dead on with the live boost function! I am hitting 17.3 avg peak boost on 4,5,6 gears. High or not, that is what I was hitting stock. Scary? I think so......

Peleg · 05-03-2006, 09:03 AM

Quote:

Originally Posted by RumblingREX

Installed Stg1 93 Octane map last night. I agree, not too much of a noticeable difference. I did confirm that my Autometer Electronic Boost gauge was dead on with the live boost function! I am hitting 17.3 avg peak boost on 4,5,6 gears. High or not, that is what I was hitting stock. Scary? I think so......

Stock you should be hitting 14.5 psi, stage 1 should be 16.5 +/- .5 psi.

RumblingREX · 05-03-2006, 10:06 AM

Quote:

Originally Posted by Peleg

Stock you should be hitting 14.5 psi, stage 1 should be 16.5 +/- .5 psi.

Stock, I was blowing by the 14.5psi range. With Stage 1, I am above the higher tolerance of 17.0 psi. I think I am a canidate for porting the turbo before moving on to Stage 2. I have a TBE in the garage begging to go on.

SUBIRU · 05-03-2006, 11:16 AM

Quote:

Originally Posted by RumblingREX

Stock, I was blowing by the 14.5psi range. With Stage 1, I am above the higher tolerance of 17.0 psi. I think I am a canidate for porting the turbo before moving on to Stage 2. I have a TBE in the garage begging to go on.

yea, i had to use the LWG map to bring it down since i was peaking 17.5-18 psi in 5th, and 6th. thats on my defi's,.. i didn't get a chance to do a live boost read yet.

Peleg · 05-03-2006, 11:28 AM

Quote:

Originally Posted by RumblingREX

Stock, I was blowing by the 14.5psi range. With Stage 1, I am above the higher tolerance of 17.0 psi. I think I am a canidate for porting the turbo before moving on to Stage 2. I have a TBE in the garage begging to go on.

Try other maps like beesti did, may solve the problem.

Sounds like you got some boost creep.

SUBIRU · 05-03-2006, 06:41 PM

i went back to the regular stage 1 map. my defi's are 1 psi off. =(

Peleg · 05-03-2006, 06:55 PM

Quote:

Originally Posted by beesti

i went back to the regular stage 1 map. my defi's are 1 psi off. =(

Oh.

I'd like to see this setup this Saturday.

***wdb*** · 05-04-2006, 04:31 AM

Quote:

Originally Posted by VetteVert

Just wanted to give all the details I could...

Thanks for the more thorough explanation. More is better!

SUBIRU · 05-04-2006, 07:56 PM

ok. i got a ECU Tari Reading of 17.269 PSI (Manifold Absolute Pressure *minus* Atmospheric Pressure). This is what i get on the Stage 1 California Map.

QUESTION:

is 17.3 PSI too high for stage 1 occuring in 5th and 6th gear only?

i keep seeing ppl post that it should be 16.5 +- .5 PSI. but is this too dangerous?

Peleg · 05-04-2006, 08:19 PM

Quote:

Originally Posted by beesti

ok. i got a ECU Tari Reading of 17.269 PSI (Manifold Absolute Pressure *minus* Atmospheric Pressure). This is what i get on the Stage 1 California Map.

QUESTION:

is 17.3 PSI too high for stage 1 occuring in 5th and 6th gear only?

i keep seeing ppl post that it should be 16.5 +- .5 PSI. but is this too dangerous?

Someone please correct me if I'm wrong, but 17 psi should be max boost for stage 1?

Beesti , r u running intake? Cobb's website says they got some maps for intakes, I emailed them but haven't heard anything.

Perhaps you can try the LWG or California Stage 1 map and see if it helps.

SUBIRU · 05-04-2006, 08:22 PM

i did try the LWG map.. with that map.. i had a hard time getting 15.5-16. i just have a k&n filter, stock air box.

SUBIRU · 05-04-2006, 09:58 PM

BAH!!! screw it. back to the LWG map. better safe than sorry.

Peleg · 05-04-2006, 10:12 PM

Quote:

Originally Posted by beesti

BAH!!! screw it. back to the LWG map. better safe than sorry.

Try the California 91 Stage 1 map....

I'd call cobb tomorrow and chat with them.

05-04-2006, 07:56 PM	#41
SUBIRU Silver Member Car: 05 STi Fav Mod: fix-it tickets Location: sj, ca Posts: 876 Join Date: Oct 2005 Trader Rating: (3)	ok. i got a ECU Tari Reading of 17.269 PSI (Manifold Absolute Pressure minus Atmospheric Pressure). This is what i get on the Stage 1 California Map. QUESTION: is 17.3 PSI too high for stage 1 occuring in 5th and 6th gear only? i keep seeing ppl post that it should be 16.5 +- .5 PSI. but is this too dangerous? Last edited by SUBIRU : 05-04-2006 at 08:00 PM.

05-03-2006, 08:59 AM	#33
RumblingREX Amateur STI Driver Car: 05 STi Location: Southern New Hampshire Posts: 36 Join Date: Nov 2004 Trader Rating: (0)	Installed Stg1 93 Octane map last night. I agree, not too much of a noticeable difference. I did confirm that my Autometer Electronic Boost gauge was dead on with the live boost function! I am hitting 17.3 avg peak boost on 4,5,6 gears. High or not, that is what I was hitting stock. Scary? I think so......

05-03-2006, 06:41 PM	#38
SUBIRU Silver Member Car: 05 STi Fav Mod: fix-it tickets Location: sj, ca Posts: 876 Join Date: Oct 2005 Trader Rating: (3)	i went back to the regular stage 1 map. my defi's are 1 psi off. =(

05-04-2006, 08:22 PM	#43
SUBIRU Silver Member Car: 05 STi Fav Mod: fix-it tickets Location: sj, ca Posts: 876 Join Date: Oct 2005 Trader Rating: (3)	i did try the LWG map.. with that map.. i had a hard time getting 15.5-16. i just have a k&n filter, stock air box.

05-04-2006, 09:58 PM	#44
SUBIRU Silver Member Car: 05 STi Fav Mod: fix-it tickets Location: sj, ca Posts: 876 Join Date: Oct 2005 Trader Rating: (3)	BAH!!! screw it. back to the LWG map. better safe than sorry.