I'm intersted in seeing what everyone is posting for boost pressures with vairous mods both WOT and Overboost.

 

mods in sig @ wot = 16psi. spike at 20 for a split second if only it would last lol

 

I just put my boost gauge on today. Only mod is an alta CAI. I hit 16.5psi. Kinda surprised me.

 

RMW Tune, Intake, Exhaust...

Typically ~16.5 -17.5 psi on WOT throttle...and it holds that, no spiking.

gotpho...how could you possibly be spiking at 20 psi with no tuning or UniChip?

 

I have similar mods to gotpho (minus hardpipe) and I am getting similar numbers.

16 psi on WOT and spiked to 18.5 and 19psi in overboost

I was suprised as well since no unichip or tune. I thought maybe the gauge was misreading since I just hooked it up and had trouble zeroing it out since I am at altitude (which I am unsure how altitude should affect boost. I would assume you would get less boost pressure since the air is thinner)

 

Thumper.... The 07 early MCS before Sept/Oct. build had a more powerful tune in the ECU.

If you have never had any ECU work done at the dealer for trouble or an upgrade, the early R56 were powerful little dogs and made wonderful boost.

The later 07s and 08/09 MCS ECU was toned down a little bit. Not sure why! Actually I can speculate, but not here.

My MCSa, today was showing my 12-14 on Rev. and one overboost @ 16.

My dealer does not touch my ECU nor wash my R56.

I need to learn how to use my new Plex wifi and Rev. it does datalog.

Don

 

Yea I'm aware, but we are talking 20 psi?? Lol, that's quite high...even more so for a stock car. I have held boost around 20-21 psi under certain circumstances, and I cannot imagine that happening on a factory tune. Kinda treading on a thin line when you're messing with boost levels that high on this motor.
Interesting though, especially when tuners like Mynes say the motor, "even the JCW motor" can't handle more than 18 psi .

**re-read his post....he said he spiked at 20 psi for a split second. Guess thats different than holding 20 psi throughout a pull...
That's one thing with the tune...I have no boost spikes....whatever boost I'm seeing on a particular pull, it holds for the entire pull.

 

i was like OHH ****WTFFFFFFF!! then it dropped back down hahaha i think ive hit it only 2 or 3 times, sadly its only a split second lol

 

Thumper, your right. a 20 psi contant load would grenade our little 1.6.

I will have to see what I can achieve with my 'stocker' 07 and the logging feature of Rev. I hope I can figure out the format of the log file.

Are you still have a great time with your RMW 1.5 tune? What is your boost in normal driving?

 

[quote=ThumperMCS;2782227]Yea I'm aware, but we are talking 20 psi?? Lol, that's quite high...even more so for a stock car.

I agree..my worry is when I have it tuned. Since I am already at 18-19 in overboost, the tune might push it up well past 20 psi. I guess Jan would keep it in the safe zone though, but would that limit my tuning potential?

 

Just like with Soccer your baseline will be higher than most so you will see less of a change. But it will not limit you, you are just starting out higher. I am so mad I am one of the people who the dealer re tuned de tuned. I didnt know until it was to late , AARGGHH

 

Yes, having a blast . Just went for a long drive up Angeles Crest and Mt. Wilson, (for those that know the area...) and I was smiling the whole time.

What do you mean by "normal driving?" I can drive around town and hardly have it be in boost at all, if thats what you mean. But WOT it usually is what I said above...about 16.5.

Got some things new things in the pipeline, so we're just going to wait until we're finished with that before we get it back on the dyno.

[quote=PoktRokt;2782423]Yes, just cuz you run 18-19 now, doesn't mean your going to be running 24 after the tune . If your boost is infact that high stock, your boost level is not going to change much.

^^^what he said

 

19lbs on JCW with mild tune.

 

Daily 15.5 to 16.5 with 17.1 on a spike.

 

Between 15 and 17.5 consistently with bolt ons and RMW tune WOT.

 

hitting 20psi with the latest tune @ 6krpm

 

Alta boost gauge shows me 13-13.5 psi at WOT and can spike to 14.5-15.5 psi.

 

18 to 19 steady at WOT

 

I've found this to be very car dependent. I've seen cars that have only made 12lbs and some that have made 17-18lbs. And when I tune I can get it to go up to whatever I want. We've had our test car at 20lbs and it was fast but not good on the internals longterm. The tuning software allows use to adjust the boost to whatever we want.

 

What do you use to tune?

 

Saw 20PSI via the scangauge (-14.6 map) on my 2009 Factory JCW - Stock.

 

Wow. Is 20 psi supposed to be stock? If so, nice!

But what values are you getting for MAP from the ODBII port? A value of 60 should be about 15psi, right?

 

JCW is 19 stock

 

MAP on the ODB port would be about 34~35 for 20PSI. Basically MAP minus atmospheric pressure (about 14.7) gives you boost preassure.

I do have to comment on how grosely slow and generally inaccurate a ScanGauge actually is.

I do have a basis for comparison from seeing a maximum of 13.5PSI on my old 2008 S - Stock on the same scangauge.

 

20psi is not too far off. I think the car can adjust a bit for craptacular air quality by raising the pressure a bit. In this case ~5% or it could be a scangauge error.