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Old 07-30-2006, 03:32 PM   #1
elohdaeh78
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Default Cobb Stage II boost question

Well i have had my car stage II for a while now but never bothered to check the boost readings from my accessport. The other day i decided to check them and i noticed i was not hitting the boost i should have been the most i could muster was

3rd - 14.7
4th - 15.0

So i decided to fiddled with the waste gate arm now im seeing

3rd - 16.0 falling down to 14.8-15.0 and holding
4th - 16.9 falling down to 16.1-16.3 and holding

I know the peak boost is supposed to be between 15.3-16.3 but is it ok if i shoot up to 16.9 for a second then it falls and holds at 16.3 or is that bad for the car when it spikes to 16.9 for that brief moment?

It is also around 80 degrees here so i am wondering if when it cools down in the winter is my boost going to be to high or does the ECU compensate for that?
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Old 07-30-2006, 08:13 PM   #2
Bbasso
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What else do you have done to the car, Start with that.

But your motor would have a better chance of longevity if you turned it down a hair. (max- 16.3)
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Old 07-30-2006, 08:22 PM   #3
elohdaeh78
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Quote:
Originally Posted by Bbasso
What else do you have done to the car, Start with that.

But your motor would have a better chance of longevity if you turned it down a hair. (max- 16.3)
your basic catless downpipe, catless up pipe, third cat in place, catback exhaust, lightweight pulley, thats about it i guess.
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Old 07-30-2006, 10:34 PM   #4
boundy3
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I would loosen the wastegate a bit untill it stops spiking.

How many turns did you tighten the wastegate?
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Old 07-30-2006, 11:52 PM   #5
roback7
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Im having the same problem. I am only seeing about 14.5 at best. I am goign to play with the wastegate a little sometime soon. How many turns did you put on it? Im looking for a good starting point to get up to where I should be.
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Old 07-31-2006, 10:01 AM   #6
elohdaeh78
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I started with 2 full turns (360 degrees) , then i tested it and i was running 15.6 psi in 3rd and 16.0 in 4th, so i wanted to get to that 16.3, so i tightened it 2 more turns and it really didn't make any difference, i went back and did an additional turn and now im hitting and holding 16.1-16.3 in 4th. So a total of 5 turns, but once you do it the first time its cake to do, so you might as well just do it two turns at a time.
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Old 07-31-2006, 02:36 PM   #7
Abetoy
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Im running into the same situation as well so i decided to try turning the wastegate arm also..gave it 2 full turns to the left and went for a drive

I ran into a small problem; the readout on AP's live boost shows im at 14 psi in 3rd and 15 psi in 4th, but my autometer mech gauge shows about 15 psi in 3rd and 16-17 psi in 4th

Which psi do I follow? Im guessing there's also something wrong with my boost gauge

btw my current mods are: Stg 2 CA map, txs catless uppipe, full catless turboback w/ prodrive oval-tip
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Old 07-31-2006, 03:48 PM   #8
roback7
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Awesome. I just went and gave it 2 full turns. I am now hitting 1.07 (so whatever that is 15.5ish). Im going to crank it out one more turn once it cools down and that should do the trick
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Old 07-31-2006, 04:23 PM   #9
elohdaeh78
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Quote:
Originally Posted by Abetoy
Im running into the same situation as well so i decided to try turning the wastegate arm also..gave it 2 full turns to the left and went for a drive

I ran into a small problem; the readout on AP's live boost shows im at 14 psi in 3rd and 15 psi in 4th, but my autometer mech gauge shows about 15 psi in 3rd and 16-17 psi in 4th

Which psi do I follow? Im guessing there's also something wrong with my boost gauge

btw my current mods are: Stg 2 CA map, txs catless uppipe, full catless turboback w/ prodrive oval-tip
go by the accessport.
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Old 08-01-2006, 02:01 AM   #10
Bbasso
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Quote:
Originally Posted by Abetoy
Im running into the same situation as well so i decided to try turning the wastegate arm also..gave it 2 full turns to the left and went for a drive

I ran into a small problem; the readout on AP's live boost shows im at 14 psi in 3rd and 15 psi in 4th, but my autometer mech gauge shows about 15 psi in 3rd and 16-17 psi in 4th

Which psi do I follow? Im guessing there's also something wrong with my boost gauge

btw my current mods are: Stg 2 CA map, txs catless uppipe, full catless turboback w/ prodrive oval-tip
Yup, I agree Use the AP and just let your passengers think you are super boosting
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