22.9 psi good or bad?
 

so my Cobb AP register 22.9 psi when i drive very hard with the car, i though you could only get that psi with bigger turbos?, the car is tuned to stage 2 and my mod are below. is this too much boost or what?

yes that is bad. have you done maf cal yet? do you have atr?

Looks like you're boost spiking. The ECU can only read that much so you don't know if you're boosting higher so it's an uncontrolled situation/

I would bring boost down under control if you don't want to be replacing the motor

i bet it's a combination of having a catless DP and needing to dial in your MAF calibration. i'd recommend logging to see if your MAF tables are good and then readjusting your per-gear load tables (with special attention to load ramping up too quickly).

no havent done maf cal yet dont know how to , no i dont have ATR just the AP

you should definitely download ATR and start crackin away at it...or be willing to pay someone to tune it for you, because boosting that much isn't good for your car.

dont mind my ignorance but ATR? is there a link you could give me lol

ATR = access tuner race...it's the self-tuning software for the AP that you can get here: Cobb Tuning

thank you i submit the request

if you aren't familiar with tuning, though, you're going to want to be really careful and really read through the tuning section of our forums. you can also post up in your local area subforum and ask if there are any local ATR gurus that might help you for beer + food or something.

do not listen to these queers...get some meth and enjoy the ride.

OP: I'm not an AP user, so I hope you and other AP users will bear with me. I have a catless dp/rp and hit and hold 17-18 psi on stock tune. I read boost with a manual boost gauge. With it I can tell when and for how long I get boost. If AP will do that, then IMHO, what you need to know and need to be telling us is when and for how long you are getting those boost values.

For instance, I get spikes of 20-21 psi when I first come up on boost. They are very transient, just for a blink of an eye and then boost settles down to my target of 17-18 and holds to my 5,500 rpm shift point, falling after that as the throttle closes.

I do not think that quick spikes like this that immediately settle to a safe 17-18 are a problem. I've put over 25,000 miles on the car with the catless dp/rp and those transient spikes. I do think that if you are holding boost at 22.9 for any length of time and are on the stock K04 that you will soon join the zoom, zoom boom club.

If you are getting climbing boost where you hit your target and then see it continue to climb past that target of say 17 or 18, then you may be getting boost creep due to your wastegate maxing out. That is a completely different issue. Since it is a true overboost that wastegate cannot handle without mechanical mods, I don't think there is a tuning solution for that, but defer to the AP gurus here on what can be done.

the only time i seen 22.9 psi on the cobb AP is when i drive the car very very but i mean very aggressive and it doesnt stay at 22.9 it just hits that and gets down to 20-21, when driving normal or a bit hard it gets 20psi

Don't forget to measure KNOCK RETARD....................... Note that this isn't a direct insult unless I put a comma between the "knock" and "retard". Measuring your timing retard under that high boost will be critical. KR should never get beyond 2 on any car. 0 is optimal. If you are at 5+, well, cue the music.................... Sure hope you like rap with heavy base:

"Ya homie, you gotta a bad ride, but you're gonna get a rape, cause the rods on da motor gonna do a shake-shake-shake". Gonna put down da power til ya hear a big boom, and then it's time to pick up pieces with a brand new broom....."

JayZ should be calling me soon for a copyright......

Besides, I believe at 18+ PSI, I think you are well past the efficiency of the K04. I will try to find a good link on that. If you aren't operating in the efficiency range of the turbo, well, all you are doing is creating heat, raising exhaust temp values, and potentially detonation/knock...... If you are using meth, it will reduce the heat and cylinder pressure (I'm not a meth user, personally, or in the engine). But, generally, what is being done will shorten your motor life, your wallet, and your psychological ability to reason with the laws of physics. Math always wins over psychologic reasoning...... even if you pay $150 an hour for a therapist (like those on these boards) to tell you it's OK.

Yeah. Occasionally when I go WOT in 4th I'll get a spike to 22.9 psi for a split second and then it drops back down to 19 or 20 and holds it there.. (before it would drop down to 17-18 and hold it there before I went stage 2).

I didn't think I had anything to worry about since it's just for a split second but after going through this thread, maybe I do?

Just like MSMS3 said, not a big deal if its a quick spike, but constant 22-23 psi is not gonna be good for your motor, So you need to run a data-log and see how much boost your actrully "holding".........the stock k04 power happy spot without meth is right around 18-19 psi......Lenny runs meth, therefore 20+ psi is just fine and you make a decent mount of tq too.

As for ATR, feel free to download it for free of the Cobb website, but its obvious that your new to tuning,so I would try to read as much information and ask alot of questions before you start. Untill then..if you truly are making a constand 22+ psi, then its time to change to a different ots map..maybe stage 1. You are in Oklahoma, so maybe a day's drive from the Cobb facility in Plano,Tx?? if your done modding you could go down there and get a pro-tune..spendy..but your car will run safe and strong.

i actually do check the ratard (lol from the hang over) anyways and its always 0 or 2 never more. i like ur rapping btw :no: thats sarcastic...

22.9 = Zoom Zoom Boom

Glad you check it... Here's that link that discusses the stock K04, and basically the warning I posted earlier today:

http://www.mazdaspeedforums.org/foru...neuspeed-5250/

NOTE: 2. OPERATION

The K04 is designed to provide reliable, long-term service as long as its performance parameters are not exceeded. Driving the car at engine speeds above 5800 rpm with 15spi or greater boost significantly increases the exhaust temperature measured inside the K04 turbine housing. This signals that the maximum efficiency of the turbocharger has been exceeded, and that the energy produced by the turbine housing is now converting to heat rather than accelerating the compressor wheel faster. Unless a careful and extended idle-down is performed at the end of every hard driving session, the rapid heat build-up from high boost/high rpm operation causes the turbine shaft to soften, and allows the inconel turbine head to droop. The result is an imbalance that ultimately leads to a shaft failure.