I see about 8.5 PSIg in boost and 12.5 PSIg in overboost. I will reset the gauge to read down to .1 PSIg and see if I can narrow the reading down.

All research I have done indicates that overboost should only be 13 PSIg. Let me know where you are are getting your information from.

 

I have a stage 1 JCW setup with a few mods on top and my scanguage shows 18+ psi on overboost. I have reset the gauge and setup as well and it shows the same numbers. Not sure why mine is so different from yours.

 

Ahh, the Scangauge. The Scangauge it not a true reading as it includes atmospheric pressure. At sea level atmospheric pressure is about 14.696 PSIg.

Under normal boost my Scangauge reads about 22.1PSIg with the boost gauge reading about 7.4 PSIg. In overboost mode the Scangauge reads about 26.5 PSIg when I am pulling about 11.8 PSIg.

Just take the Scangauge reading and subract 14.696 and that should be your actual boost. Keep in mind that if you are at a higher altutude the 14.696 number will decrease.

 

Do you think your boost gauge and the scangauge may be measuring boost in different areas accounting for this difference? Scangauge measures it at the intake manifold. Where is your boost gauge taking its measurement from?

 

My boost gauge is also measuring from the intake manifold right at the Mass Air Pressure (MAP) sensor. The Scangauge takes the reading right from the MAP sensor which does not deduct the current atmospheric pressure.

The ECU has to use the combined atmospheric pressure plus boost pressure in order to correctly adjust air/fuel ratios and engine timing to provide the best performance/efficiency.

As you transit from varying altitudes the ECU adjusts these things as required to keep the engine running smoothly.

 

Just to be clear, does the scangauge measure boost. ?

 

ECU question:

Will the ECU after the JCW flash adjust for detected changes in the positive sense rather than throwing up ECLs
and going to safe mode?

Will the stock ECU behave the same and is there hard data supporting that?

 

Yes but you have to subtract your current atmospheric pressure from the reading. Atmospheric pressure at sea level is about 14.696 PSIg

 

I have had no CEL on my R56 with any of the changes I have done. I added the Alta turbo inlet tube since having the JCW flash and the ECU adjusted accordingly to the change (+5 to +7 HP on the scangauge).

 

Thank you Scott.

Did you install both Alta tubes at the same time? I am hoping that you may have tested them separately.

My new JCW suspension is quite nice BTW.

 

I put on the ALta intercooler and both boost tubes at the same time. I did not own the scangauge at the time. The turbo inlet tube is the last addition to the MINI.

 

So the measured gains are for all three Alta tubes?

Will the Alta turbo inlet tube fit my JCW air intake?

BTW did you consider the AutoEnginuity Scan Tool before you purchased the ScanGauge?

What wheel/tire do you run on and how do gearing changes impact ScanGauge readings?

 

The last measured gain was for the Alta turbo inlet tube of about 5-7 HP. The previous measured gain was the JCW Stage One Tuning Kit of about 16 HP. All mods prior to that were made before I purchased the scangauge for the MINI.

am not familiar with the AutoEnginuity Scan Tool.

I am running factory wheel set ups:

Summer - 205/45/17 (factory MCS wheels)
Winter - 195/55/16 (factory MCS wheels)

 

so let me get this straight, the 2009 JCW has a bigger turbo than the 2007/2008 MCS? -any other engine differences? (besides air intake)?

I had assumed that the JCW was basically a MCS w/ a stage 1 or 2 kit attached. (and other visual upgrades)

 

The head is also different along with some top end engine components. Still the same tiny intercooler...

 

scottab36
Was dealer installation optional for your kit (less software)?

 

Not that I am aware of. I got the full JCW Tuning Kit. There are only 3 parts to the kit:

Software Flash
JCW Intake
JCW Exhaust

 

Scottab36
One more question. A 16hp to 19hp bump is enough, that I would imagine it was a significant change in feel. Was it?

 

The Factory JCW besides having the same tiny intercooler also has the same non JCW airbox/intake....

 

With everything I have done to it the car feels great. IMO well worth the money for a safe and warrantied upgrade.
One of the guys I work with keeps complaining that he has trouble keeping his head off the headrest under heavy acceleration. I just laugh and slam the pedal to the floor.

 

Scottab36,

Thanks for the info. Sorry it took some time to answer but I have been away. I retested my boost and got 25.9 psi on scangauge on overboost at sea level (I am close to you in CT). I just have JCW stage 1, Mini-mania filter and a hot side silicon intercooler pipe. I was going to connect up the scanguage on my friends 09 MCS to see what he is boosting at stock. Like you I did not have the scanguage until afer I out on the JCW.

Do you have the intake temp versus outside temp difference from scanguage for your car? I insulated mine a little and the intake temperature shows about 3-6 degrees more at 60 mph.

Thanks

 

With running the Alta intercooler I do not see a difference in air inlet -vs- ambient air temperature at 60 MPH. If I am hard into the car I will see 6-8 degree increase but it quickly disappears as soon as I am off the pedal. Even while cruising at speeds higher than 60 MPH I see very little increase in air inlet.

The only time air inlet (AI) temperature greatly increases is while sitting in traffic. It quickly decreases as soon as the MINI starts moving again.

Here's a little secret for you. In the summertime just turn on the AC and the radiator fan will quickly lower your AI temperature while sitting in traffic.

 

Thats roughly 11.3 with the deduction?

 

Yes, And I was responding to Scottab36 who mentioned a 26.5 psi reading on his Scangauge with his mod list.

 

Thanks for the info, I don't have an uprated intercooler or the other tubes etc. I just want to avoid the dreaded P2187 running lean CEL light.

I think at this time I will concentrate on some suspension mods since I plan on tracking the car more this year.