[DoctorSTi]

I went to stage 1 about a month ago and at first I didn't notice a whole lot. The car did seem to spool up a little faster to higher boost. I did datalog the car at this point and I was hitting the target boost in at least 4,5, and 6th gears. I don't know if the car is crazy faster or not. I didn't do the hard reset method some talk about (unplug battery and pump brake pedal a couple times) as I figured any flash memory or ECU learning has to be wiped out when the AP is initially installed. Anyway I am going to wait a while to get stage 2. I am happy with how fast the car is since I don't get the track a whole lot I am not looking for more power.... yet. I do wish the highway passing speed would improve a little. I would love to drop it into fifth and just go like crazy.

Biggest changes for stage 1 I noticed what smoother idle and slightly faster spool to peak boost.

[SUBIRU]

no fried ecu. SUCCESS!




stock peak!


AP Stage 1 peak!

Originally Posted by DoctorSTi

I went to stage 1 about a month ago and at first I didn't notice a whole lot. The car did seem to spool up a little faster to higher boost. I did datalog the car at this point and I was hitting the target boost in at least 4,5, and 6th gears. I don't know if the car is crazy faster or not. ... ... I do wish the highway passing speed would improve a little. I would love to drop it into fifth and just go like crazy.

Biggest changes for stage 1 I noticed what smoother idle and slightly faster spool to peak boost.

its pretty much on the money with what doctorSTi said. but, i can't really tell if the car spools up faster (since its just an ECU mod), but i did hit higher boost levels. and 4,5,6th gears on the freeway is a much smoother harder pull. when i was able to glance i know i hit 16.5psi consistently when i was watching the playback on the defi, and somewhere along there i was able to hit a peak of 18psi.

but like wdb said, stage 1 is good, but not for its money's worth. stage 2 is more ideal with the AP. yet i don't see myself with stage 2 for while. i still in process of tinting and purchasing new tires.

oh well! i'm still happy overall that the whole initialization process went smoothly as it did. thats wdb and all members that post q & a's on iwsti.

[tinamina]

I'm waiting for the ups man to get here cause my stage 1 ap comes today!! My dp is on backorder and it is supposed to ship out tomorrow, hopefully it does!!

[DoctorSTi]

Beesti, you sure your Defi's are calibrated because stock you shouldn't be hitting more then 15 and i am pretty sure that target for stage 1 is 16.5 + or - 0.5 lbs.

[Peleg]

Originally Posted by DoctorSTi

Beesti, you sure your Defi's are calibrated because stock you shouldn't be hitting more then 15 and i am pretty sure that target for stage 1 is 16.5 + or - 0.5 lbs.

He can also check the boost level with the AP itself or with the TARI software.

[SUBIRU]

i read that electronic boost recalibrates themselves on start up. should i be worried that i hit 18psi? i'll reset the defi and get another reading for peak. i don't have anyone to read the AP for me and i think it would be dangerous for me to take my eyes off the road at high speeds.

when i was doing a playback of my run, in 2nd, 3rd, 4th, i hit no more than 16.5. i'll check if 5th or 6th is giving me the high boost spikes.

[wdb]

Hey, that AP looks familiar...

Well now I can breathe a sigh of relief, knowing that your install went smoothly. After all, how embarassing would it be if the author of the FAQ on buying and selling AP's didn't unmarry it correctly before selling his own???

Glad you're liking it. Now I'm off to spend your money.

[SUBIRU]

Originally Posted by wdb

Hey, that AP looks familiar...

Well now I can breathe a sigh of relief, knowing that your install went smoothly. After all, how embarassing would it be if the author of the FAQ on buying and selling AP's didn't unmarry it correctly before selling his own???

Glad you're liking it. Now I'm off to spend your money.

not so fast buddy boy. i got a few comments and questions. 1) i like the ap. ty. 2) do you remember what boost readings u were getting in all the gears?

from what i can see (on the defi) gears 1,2,3,4 < 16.5ish PSI

BUT, in gears 5 and 6, i seem to hit 17.5-18PSI, but never exceeeding 18. the defi when started seems to be 1 needle above 0, but i wouldn't constitute it being .5 off. so is 18 too high for california gas stage 1?

[aldouse]

hey! pick me up lets go for a drive bEesti!

[DoctorSTi]

Yes 18 is too high. Search but I think the answer is to flash the LWG real time map and see if that lowers you a bit. I am also pretty sure Cobb's website and forum would be helpful to take a look at.

[SUBIRU]

Originally Posted by DoctorSTi

Yes 18 is too high. Search but I think the answer is to flash the LWG real time map and see if that lowers you a bit. I am also pretty sure Cobb's website and forum would be helpful to take a look at.

just sent a the cali lwg stage 1 map to car. hit about 16 - 16.5 psi in all gears. looks like that's about right for stage 1. thanks doctorsti for the help.

[Peleg]

Originally Posted by aldouse

hey! pick me up lets go for a drive bEesti!

Why don't you come to the May 6th meet in Fremont?

[Peleg]

What happens with the wastegate with the LWG duty map? Can someone explain that....

[SUBIRU]

Originally Posted by Peleg

What happens with the wastegate with the LWG duty map? Can someone explain that....

from my understanding, a wastegate just bypasses some of the exhaust gases. therefore, if the turbo is spinning too quickly (building up too much boost), the wastegate will open and bypass some of the gas, allowing the turbo boost to stabilize.

i guess this tells the wastegate to allow some gas to bypass and letting the turbo build only a certain amount of pressure.

[wdb]

According to wikipedia:

A wastegate is a valve that diverts exhaust gases away from the turbine wheel in a turbocharger. Diversion of exhaust gases causes the turbine to lose speed, which in turn reduces the rotating speed of the compressor. The primary function of the wastegate is to stabilize boost pressure in turbocharger systems. The wastegate is controlled pneumatically by a wastegate actuator.

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.