[nittany]

For those who are stock and running a COBB AP stage 1 flash, what's your highest boost you hit?

I did some runs yesterday with the AP installed and using the boost monitor function (which shows your lowest/highest boost during a run) and noticed I hit 17.7 psi!

Is that even possible when I don't have any other major mods? I only have a DCI along with the map 1 - oct 91 latest flash. I didn't do any data logs, I was just playing around with the monitor function on the AP.

Maybe the boost monitor function isn't 100% accurate on the AP? Or am I interpreting this boost function wrong? Elevation isn't too high about 300 ft above.

Curious what you guys are hitting your boost at...and confused why my car is hitting that much boost.

[blisstik]

Most likely a spike with a ton of heat soak. How many high rev runs did you do?

[Alan l.]

Its probably shift spike. I've seen mine as high as 20psi during a shift.

[nittany]

Originally Posted by blisstik

Most likely a spike with a ton of heat soak. How many high rev runs did you do?

Okay, that could be it, I did about 3 or 4 runs prior.

[Bimmer This]

Originally Posted by Alan l.

Its probably shift spike. I've seen mine as high as 20psi during a shift.

this!

[Litos]

is it spiking 17 and holding it for more than a second or so.

if so, i'd be a little hesitant to WOT any more before sending in some logs.

[Proper Motion LLC]

6MT?

[nittany]

thx fellas, still learning all of this..

[cstmx_ryder]

Most likely a spike like others have said.....if there's a way for you to hold that AP unit close to eye level during WOT, then you can peak over and see the 'sustained' boost which should be close to whatever stg1 boost target is.....

I've gotten spikes as high as 18 psi and i have an AT.

[cstmx_ryder]

*peek

[nittany]

Originally Posted by Litos

is it spiking 17 and holding it for more than a second or so.

if so, i'd be a little hesitant to WOT any more before sending in some logs.

It's just instant, and I was just surprised to hit over 17psi.

Btw..it's AT.

[Litos]

yeah, it's just spike. should settle @ 14psi after the initial surge.

[Proper Motion LLC]

Just to give u an idea, here is a 2-3 shift spike while running a 14.5 psi map.

[nittany]

Originally Posted by Rysandro

Just to give u an idea, here is a 2-3 shift spike while running a 14.5 psi map.

Thanks man, this makes it easier to understand it.

[Proper Motion LLC]

Yah and that's also a 6AT car (mine)

[Litos]

my STi did the same with the Stage 2 Map

[dzenno]

most likely a shift spike if you're 6mt BUT you won't know for sure unless you can properly datalog the run

[Clap135]

It's a shift spike 100 percent, how are people still confusing this for actual boost is beyond me. Your engine never even sees that boost pressure.

[ZTUNER]

Don't go by the peak hold in the ap, even with an auto when you get off the boost there is a momentary spike due to the delay of the bovs reacting. First time i saw it i was shocked, then i looked at the logs and it made sense. With the stock ic the ap was showing significatly higher boost hitting 15.5 to 16 psi when you got on the gas then dropping immediately to low 15s and tapering off to low 12's by redline.

My suggestion is to log requested boost vs actual boost and see if there is too much difference.

Harry

[SennaZ]

What Harry said.

I suppose Cobb could do a smoothing function so those spikes wouldn't bias the peak boost reading on the display, since as it is, it has little to do with reality.

[nittany]

Thanks everyone for the knowledge!

I'll have to do some data logs later on to get the bigger picture, but now I understand what happened.