As long as the engine isn't knocking there shouldnt be any problems. Theres plenty of people that have been running increased boost with no mechanical problems to speak of. Seeing as how the car will pull timing and boost if it detects any detonation, I dont really see how there's anything to worry about.

 

Keep in mind pressure, volume, direct injection, spark advance etc all have to be balanced together. No stress my friend!

 

This is VERY true, even with a piggy, timing can still be pulled!

 

The car will pull timing to a point, after that point it will ping until the piston finally fails (It's happened to numerous people, including myself), and it has to knock first before it can pull timing, at which point, damage has already been done.

Regardless of whether the car is knocking or not, higher boost stresses engine components more, running 21 psi of boost on a car with an aluminum block is asking for trouble. Running it on a car with a 10.5:1 compression ratio is asking for even more trouble.

Yes, DI cools things down a bit, but not THAT much.

Mechanical issues with running high boost aren't going to manifest themselvesright away. Things like that take time to show up. How does 40-50k mile engine life sound?

 

Sounds like 4 to 5 times the number miles I would put on before ripping apart the engine to upgrade the internals and start looking at running a bigger turbo.

Or 2 to 3 times the lifetime of any toy car I ever owned...

 

I honestly some additional research should be made on your end. Direct Injection makes a HUGE difference on cylinder conditions under boost. Also, the 21 psi is a peak reading and bleeds down to 14 psi at redline.

More info coming from JEff as well. Hope that helps!

 

HAHAHAHAHA!

 

I know it helps, DI is great for boosted motors, but as Thumper said, there's a reason JCW chose to lower compression for boosting 18 PSI. That reason was probably because it wasn't a good idea to be boosting 21 psi on the stock compression ratio.

As for boost tapering off, that has more to do with the stock turbo being too small to keep up after 5k rpm's or so and less to do with the design of the tune.

 

Sounds like you definitely represent the majority of R56 owners then...

 

Running 21 psi of boost on 10.5:1 compression would only be asking for trouble if the engine was knocking to begin with, but its not. With my current Alta map and 93 octane I have experienced NO pinging or knocking whatsoever, no matter how aggressively I drive the car. To me 40k-50k sounds a little pessimistic considering there are no problems with detonation.

 

GOOD POINT AGAIN!

 

Ok .

 

I think what hes saying is that you gotta pay to play, and we're all adults here that understand modding your car can have adverse affects on your engines lifespan. However, I highly doubt the Alta Ecu will cause any premature mechanical failures.

 

Have you dyno'd a car with this system on it to see the a/f ratio?

 

So what problems have you had? I have yet to see any posts about people having problems with the Alta ECU and detonation. Yes, there was a whole bunch of issues with harnesses etc , but other than that the other stuff seemed to be people using the wrong octane or running maps meant for aftermarket intercoolers on their stock intercooler. If you get the right map for the right mods, I dont see how there would be a problem.

 

I would LOVE to dyno my car, but im a little out of my element here in Germany. Theres a couple of tuning shops with dynos within a couple hours of me, but they are ridiculously overpriced. I'll wait till i get a few more mods and I'm home in Cali next year. However, there's a few dyno sheets floting around this site from people running mostly the same setups.

 

let me know when you get back to Cali....
you can stop by the shop and we will toss it on for free

thanks for serving!

 

Hmm, I have!



I'm pretty sure even Direct Injection cars that run 10.5:1 compression don't like air fuels of 15. Hell, NA Engines don't like air fuels of 15...

Oh, and the car wasn't audibly pinging! There is such a thing as inaudible pinging you know.

 

Hey no problem. Im from Fullerton so I'll definately be in the area. Thanks for the offer

 

Just curious, but are you guys at Rev Mini working on any sort of R56 tune?

 

we believe in ONLY changing the factory hex code as piggy backs have NEVER worked for us

our software manufacturer are working on the software now

 

Nice, good to see some other options coming out. Hope everything turns out well. I opted for the Piggyback because I obviously dont have access to a reliable tuning shop, and I wanted to be able to remove all traces of aftermarket mods when I ship my car back stateside. Iv'e heard good things about you guys with the r53 community so im anxious to see what kind of r56 stuff youll be offering in the near future.

 

You Alta guys got any input on this? Rustyboy does make a good point. Should I be worried about afr's even running a fairly conservative map? Theres been talk about AFR's before, but it always seems nobody can get consistant numbers

 

Ok, nice photo, how about some details... what am I looking at? Where was the probe, where is calibration data, something... other than than round up from 14.94 to 15... or round down from 15.6 to 15...

 

The 15.6 was at low RPM's, hence I wasn't using those figures. As for "rounding" if you notice, the 14.94 was from the green graph, the blue graph is even leaner, so yes, rounding up 6 hundreths of an air fuel is probably ok in this case. The graph is right there, dunno why you can't read it yourself. For the record the car in question had a few other things done to it, though nothing that should affect air fuels (Intake, Alta Turboback). I'm not going to give too much information about it because I don't want to start up a sh*t storm, just making the info available.

The probe was in the tailpipe (Where else do you probe for air fuels during a dyno?). I have no information on dyno calibration other than other cars that ran that day with completely normal AF's.

As for what you're looking at, I think it's fairly obvious, a dyno graph showing air fuels on a car with a Unichip. If it helps, the car was "Tuned" by Alta at AMVIV.

As far as whether or not it's an anomaly, that's completely subjective, and beyond my scope of knowledge with R56's. I don't own one, and don't really follow all the threads with info on them. I happened across information, and posted it for public consumption. I didn't generate the dyno, nor was it my car.