hi guy s how much boost is the car running stock and thas it hold the boost until red line?

 

i hit a peek of 15 the otherday

 

I believe its 15 peak boost at stock boost levels.

 

My peak has only been about 13.5 psi.

 

According to the Mini info,

Stock MCS boost is .8 bar which is approx 11.6 psi
JCW stage 1 boost is .9 bar which is approx 13.1 psi

 

i get 15 all the time. defi gauge. maybe some gauges are ''off''

 

Do these figures include the "overboost" feature, or does the overboost take it even higher?

 

Scott, those figures are reported in the Mini literature and Mini writeups including car & driver, road & track etc. I am not sure about overboost which makes these numbers tricky.

 

'07's that haven't been to the dealership for updates will see ~15.5PSIg
'08's will see ~12PSIg
'08 w/ JCW Stage 1's will see ~14PSIg

^^^That's all "Overboost". Normal boost is a paltry 8.5-ish PSIg. YMMV depending on climate and mods.

The MCS's all taper to about 8PSIg at 6500 RPM, whereas the JCW Stage 1 tapers to 9PSIg at redline.

 

I've wondered about this too. I took my 07 to the dealership last year for the installation of the multifunction wheel (it's an early 07 ) and performance was noticeably lower ever after. I'd swear the overboost is no longer there. The lower level of performance definitely reduced the torque steer, but I'd rather have it back .

Any more details on why this was done?

-JL

 

I could only speculate it was to increase the performance gap from Cooper S to JCW models. As it stands now you need to buy the JCW Tuning kit to get back the bulk of the '07 MCS ECU tune. Another possibility is some high-up party pooper found out the MCS puts out significantly more power and torque than advertised and wanted to pull it back to reduce the potential for warranty work. The irony is BMEP has nothing to do with the two main design problems of the Prince engine [HLAs and chain tensioner]. The only backlash is on the grassroots level when guys like us find out MINI lowered the torque output.

 

Running 15.5psi on overboost on 93 octane...
-16.5psi on overboost on 98 unleaded octane...

 

well...finally after connecting my boost gauge.....im running an un"branded : software..its 15psi...fluctuates to 16-17psi... on stock i/c..tomorrow is d-day with that software, trying to resolve the mystery misfire at 6k rpms....will update tomorrow night..stay in touch

 

Hows the tyrolsport intercooler coming along minipolack?

 

2007 MCS with NM Eng Intake mods.

I boost to just under 16.

Idle at -20

upon gas release and slow down -22

easy riding -10

and, not sure if this is obvious, but, i am at about 0 when i hit the gas, and right before the turbo starts spooling

 

the 07 seems a lot better than the 08. you get more boost and a LSD

 

IIRC, the boost pressure can vary based on the atmospheric pressure(altitude), which is why some people see higher boost than others.

 

and temp haha

 

 

Correct. The car runs off the absolute manifold pressure which is atmospheric pressure + boost. The car will peak at the same manifold pressure under all conditions.

At sea level atmospheric pressure is 14.7psi. With altitude this drops significantly, meaning cars running at altitude will be able to make more boost. This does not mean they are making more power, as the manifold pressure will still be the same.

Likewise, atmospheric pressure can vary quite dramatically if depending on prevailing weather conditions, ie if you are currently having a high pressure or low pressure weather system.

Robbo