How much boost do you think a mcs could max out on without a tune and being safe? My guess 15psi. I'm not going to push more boost without a tune but im jut curious.and who is pushing more boost than stock specs and how much? I think stock is 11.5psi

 

I'm pushing about 20 psi safely.

 

Any tuning? Diff spark plugs or timing ect. And how many miles approx have you been running 20 psi

 

i dont know how accurate the scangauge it with boost anyone could chime in but i read 15 for me... all i have is a k&n drop in

 

I'm running a Garmin Nuvi 1390 with a Ecoroute HD and it is showing up to 18psi with the JCW tuning kit.

 

I think that whatever boost you can get without any tune should be fine. I do not think you will be able to get too much above the 0.8 to 1.0 bar from stock mcs. Question is how are you thinking of gaining boost without a tune?

 

Your saying that if stock mini is 11.5 psi that i could push 22 to 25 psi? And technically tweaking the wastegate is a tune but i mean like a complete tune. Timing, diff spark plugs, diff fuel injectors. That kind of tune.

Big jim- your garmin reads pressure/vacuumn? Thats wierd and pretty neat. Hiw much did thr jcw kit cost if you dont mind me asking

 

Just trying to answer your original question: What boost can I run safely w/o a tune? I think it is doubtful you can get 25 psi boost without a tune.

Timing is part of a tune.
Spark plugs do not generally add boost.
Fluid injectors might by pumping more volume for HP but you need something else to really make a difference in boost.

Still not sure how you could push up boost w/o a tune.

 

Well 25 psi is 1 bar above stock pressure. And thats y i said technically closing wastegate longer is a tune. But thats how you get more boost, by changinf the duty cycle on the waste gate. Ans some people believe changing spark plugs to a step colder helps with added boost and you dont necesarily need to change timing for a small amount of added boost. I was just curious to see how many people have added boost wirh out a tune. And bigger fuel injectors are just to keep the 14.7:1 air fuel ratio. More boost equals more air so you need to add more fuel and tuning stock injectors arent always the safest thing

 

how can u raise your psi im runing 21-23 psi

 

oh, I missed the "without a tune" part. Well, if I remember correctly, I was getting about 16 psi before I got an AP. Doing the resonator delete also helps.

 

Go into a tuning program and you need to increase the percentage of the wastegate duty cycle. This will alow the wastegate to stay closed longer in order to build up more boost

And WAR, have you done any internal swaps? Like connecting rods or anything? And have you put it on the dyno yet? If so how much power do u have to the wheels

 

I have a ap can I c

 

Wow sorry about that other message but, I have a ap I don't think I can control the wastegate duty cycle... Or can I

 

Haven't gotten that crazy with it just yet. She's still my daily driver, so I can't do too much to it, just bolt-ons and suspension work. Haven't put it on a dyno either, but now that you mention it, I'll probably try to get some data for it soon!

 

cschues I recommend you spend some time reading through the Drivetrain section of the forum...

I'm not quite clear on what your intentions are but it sounds like you want to increase boost without a tune, just by toying with the wastegate?

While this works on other cars...it will not work on the R56. The ECU will go haywire trying to control the boost. Our boost is controlled by the ECU by a variety of realtime factors that it takes into account. Your only option is to get a complete tune, either from the AccessPort or Dimsport software.

You can see any boost level up to 22psi. Your car will cut any boost above 22 (unless you have a factory JCW). Most run 18-20 ish here.

Also please take note of all the piston failures...I'd recommend not going above 20psi.

 

Well i wouldnt go with out a tune. I was just curious to see what mini would allow their engines to go through. Basically seeing how well they will hold up

 

Ive looked into the accessport program. They have a monitor called WGDC which stands for waste gate duty cycle. Its listed as a percentage. Can you tweek it? Im not sure, but you can deffinatly monitor it

 

With the jb+ mod I'm safely running 25 26psi, and it's awesome.

 

Saying you're "safely" running 25-26 psi is pretty doubtful. Even on JCW, I have serious doubts that's safe. On an MCS (with stock bottom end), that's a timebomb (it's inevitable that will kill the engine).

I question whether your gauge is wrong, you're "misremembering" the boost, or you're getting ready to buy a new engine.

 

If you're actually getting 25-26 psi you won't be doing for long.

Something is not right for starters, the ECU cuts boost around 22 psi and the JB+ will not boost that high even if the dial is all the way maxed out.

 

Can't answer this post 'cause I bought my MCS just to build it up. Perrin Performance tells me 280 WHP is the max they build and tune for. RMW tells me taking the boost over the ECU limits of 22 is asking for serious trouble. I've ignored both and am currently running 30PSI to produce 300WHP. My kids no longer have much of an inheritance, but I'm having a blast with this thing.

There is still bad news --- the post-turbo hoses don't want to stay connected at 30PSI, and "engine rolling" under hard acceleration helps disconnect them. The NM lower engine mount is pretty much useless preventing the "engine roll", so I'm looking around for either a stiffer lower mount or a "snubber" of some sort --- TBD. PCV system has also been disconnected --- it can't handle the high boost. As a result, there's some extra oil consumption due to no crankcase vacuum, another issue I'm working on.

Some advice --- don't even think of building it up without first finding a tuner to work with. They're out there, but mostly in high-population areas.

 

Do you have stock engine internals?

Vibratechnics now makes a version for the lower mount.

 

Engine internals and other significant power-making mods are listed in my sig.

I'm holding off on Vibratechnics 'til I get a better handle on the way this mount functions. There's some interaction with the top passenger side mount too.

 

I'm safely running, and yes, im safely running 24 psi with stock internals. But I also have an amazing tune and better turbo.