18.5 PSI??? What's going On???

[Stew]

I was driving around tonight and noticed my boost spiking on my boost gauge. So I decided to plug in my AP and double check. Sure enough, it was spiking to as much as 18.6 psi before settling back down to 16.5. I took a few logs so that I can see what is going on.

My mods are:
I just this week put on a Cobb SRI and Corksport TIP. I also have an AP of course
Corksport RMM, MT-90 trans fluid, Short Shift Plate
I am running the Stage1+SF+TIH 93 v231 map. One possible reason for the overboost could be that this tank is only 91 octane. Just wanted to see if anyone had input, cause as the map description states, Peak boost is supposed to be 16.5 psi.

[Pu Manchu]

post a log, goddamnit, not some screenshot, then maybe someone can help you.

preferably a solid 4th gear log.. 2500 - 6500 rpm.

[Stew]

Ok. Wasn't sure if I could upload an excel file. Probly should have read the valid file extensions.

Here are the actual logs.

[boostdmazda3]

boost spiking and holding are two very different things.

[6Y MAZDA]

WAIT...

You said you have a CS SRI but you are running a Stage1+SF+TIH 93 v231 map....Wtf.
You're supposed to run the Stage1+CS+TIH map...

[Stew]

No. I have a COBB SRI and a CS TIP. I reflashed the map to the correct 91 octane today when I filled up. MAybe that will fix the issue. I'll have to run a couple more logs and see.

[6Y MAZDA]

My bad, i swear i saw CS SRI lol. Reading fail.

Using the wrong octane shouldnt affect boost though. Probably just need to adjust your WGDC tables.

[Stew]

That's ok. Alright, so I'm totally new to the whole tuning thing. What are WGDC tables? I don't even know exactly what all the columns on the chart mean or what they should be. I have been trying to read up on it.
STewart

EDIT: I do know the basics, but I thought that WGDC tables were only for using ATR?

[6Y MAZDA]

Originally Posted by Stew That's ok. Alright, so I'm totally new to the whole tuning thing. What are WGDC tables? I don't even know exactly what all the columns on the chart mean or what they should be. I have been trying to read up on it. STewart EDIT: I do know the basics, but I thought that WGDC tables were only for using ATR?

Yes, you'd have to edit the WGDC tables in ATR.

EDIT: I just looked at the two logs you posted...i don't see 18psi anywhere. I see 14-16.5 psi. Looks right to me.
Only 2 cells of 17.5 but OTS maps are +/- 1.5 degrees of what they claim.

Your logs are fine. I wouldn't adjust anything...at least nothing to worry about. Like i said...OTS maps are +/- 1.5 degrees of what they claim. It even says that on the Map notes.

[Redline143]

If you are overboosting, lower your commanded WGDC to 5 below the values trend your logs show for each 1psi you're overboosting to see if it helps--most of the time this addresses the issue. 5 is just a starting point--each car responds differently...

[Stew]

Ok, thanks. How do I get ahold of a copy of ATR? I didn't get one with my AP.
You are right 6Y Mazda, it does say +/- 1.5, I was just worried about over boost. I have another log with a couple 18+ psi in it. Those were just a little shorter so I posted them. I'm going to try a couple more logs when I get a chance and see what happens with the map change.
STewart

[Hoyoman]

Go to cobb website press atr and submit application and they will send you your copy through email

[IlleztImportz]

Originally Posted by Stew Ok, thanks. How do I get ahold of a copy of ATR? I didn't get one with my AP. You are right 6Y Mazda, it does say +/- 1.5, I was just worried about over boost. I have another log with a couple 18+ psi in it. Those were just a little shorter so I posted them. I'm going to try a couple more logs when I get a chance and see what happens with the map change. STewart

You get ATR by going on the Cobb website. But before that, you should read a few of these stickies MazdaSpeed 3/6 - ECU Computer Tuning - Mazdaspeed Forums . I learned quite a bit before I actually started messing with ATR and calibrations.

[Stew]

I actually just started reading those last night. I downloaded a couple of the guides and when I get time, I'm gonna start trying to understand them. Will be ordering HPFP internals soon so that I can keep going with mods. And more mods is a motivation to learn about ATR. Thanks for the help.