Cobb AP: ?s on product, features, and various maps incl Perrin maps go here [merge]
Newbie
Joined: Oct 2008
Posts: 72
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From: Roanoke, Va
I just got the AP and installed it yesterday. I was trying to check the boost and was wondering do you take the boost reading it gives and subtract the barometric pressure reading? Also, there was a third boost reading (i think absolute). It was reading like 5.3, what is that?
Im also curious on how close to real numbers the dyno estimater is on that thing. If you are on a perfectly flat road and did say 5 runs with it and averaged them, would it be a pretty reliable set of numbers?
What other indications would you be looking at to see if the car has accepted the thing well.
1) I already think I should be looking to be sure the boost is hitting the stated max and taper numbers
2) The knock count? I ran the car for an hour normal and high rpm. Got 1 count while running normal at around 2500 rpm.
3) Advance? Dont have a clue what readings are telling me here or how I should take them.
Im also curious on how close to real numbers the dyno estimater is on that thing. If you are on a perfectly flat road and did say 5 runs with it and averaged them, would it be a pretty reliable set of numbers?
What other indications would you be looking at to see if the car has accepted the thing well.
1) I already think I should be looking to be sure the boost is hitting the stated max and taper numbers
2) The knock count? I ran the car for an hour normal and high rpm. Got 1 count while running normal at around 2500 rpm.
3) Advance? Dont have a clue what readings are telling me here or how I should take them.
I just got the AP and installed it yesterday. I was trying to check the boost and was wondering do you take the boost reading it gives and subtract the barometric pressure reading? Also, there was a third boost reading (i think absolute). It was reading like 5.3, what is that?
Im also curious on how close to real numbers the dyno estimater is on that thing. If you are on a perfectly flat road and did say 5 runs with it and averaged them, would it be a pretty reliable set of numbers?
What other indications would you be looking at to see if the car has accepted the thing well.
1) I already think I should be looking to be sure the boost is hitting the stated max and taper numbers
2) The knock count? I ran the car for an hour normal and high rpm. Got 1 count while running normal at around 2500 rpm.
3) Advance? Dont have a clue what readings are telling me here or how I should take them.
Im also curious on how close to real numbers the dyno estimater is on that thing. If you are on a perfectly flat road and did say 5 runs with it and averaged them, would it be a pretty reliable set of numbers?
What other indications would you be looking at to see if the car has accepted the thing well.
1) I already think I should be looking to be sure the boost is hitting the stated max and taper numbers
2) The knock count? I ran the car for an hour normal and high rpm. Got 1 count while running normal at around 2500 rpm.
3) Advance? Dont have a clue what readings are telling me here or how I should take them.
From Cobb Forums:
Hi everyone, my name is Chris, and I am the engineer working on this bug. I apologize for the AP displaying inaccurate values for Boost Pressure. The fix will be up very soon.
To be exact:
Boost Pressure = Absolute Pressure - Barometric Pressure
The problem has been diagnosed to the AP failing to get the correct Barometric value, only if paired with Absolute Pressure, from the ECU. That is, Absolute Pressure and Barometric Pressure individually work great, but when polled together, baro falls out. The 5.8 psi value is the default value the AP shows in the event of an unintelligible barometric value.
Again, sorry for the confusion and inaccuracy, I am wrapping up the solution as we speak.
-Chris
To be exact:
Boost Pressure = Absolute Pressure - Barometric Pressure
The problem has been diagnosed to the AP failing to get the correct Barometric value, only if paired with Absolute Pressure, from the ECU. That is, Absolute Pressure and Barometric Pressure individually work great, but when polled together, baro falls out. The 5.8 psi value is the default value the AP shows in the event of an unintelligible barometric value.
Again, sorry for the confusion and inaccuracy, I am wrapping up the solution as we speak.
-Chris
Any Info or Experiences: Perrin Stg.1 vs. Cobb Stg.1 93oct
I just ordered a Cobb Acessport Tuner with Cobb Stage 1 map & Perrin Stage 1 Map. Does anyone have experiences with either of these maps and how they compare against each other. Any input is greatly appreciated. 
Which produces more numbers or better drive ability etc...
Which produces more numbers or better drive ability etc...
Last edited by Clipse3GT; Apr 5, 2009 at 09:23 PM.
I just ordered a Cobb Acessport Tuner with Cobb Stage 1 map & Perrin Stage 1 Map. Does anyone have experiences with either of these maps and how they compare against each other. Any input is greatly appreciated. Which produces more numbers or better drive ability etc...
Which produces more numbers or better drive ability etc...
Thanks!
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verkion
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Rob
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