I assume the flash has built in boost limiters.

anyone know the settings on these (at which the boost limiter cuts fuel):

Stock
91 Ocane (pump)
93 Octane Pump)
Race

Remember it's an X50 flash

Thanks!

 

I see 0.8 bar stock, and 1.1 bar (even 1.2 once) on 91. I haven't used 93 or race.

 

Either program should see 1.1-1.2 bar on a X50. The timing is the change in the octane.

 

sounds like your actuators may not be holdin' they're own!

 

will you get the 1.1-1.2 without "adjusting the wastegates" or is that mandatory on an x50?

 

You should, but we see the spec from the factory all over the place. Sometimes we have to adjust.

 

PORSCHE PHD - I have a question - here in So California, only 100 octane racing fuel is available - what happens if I run the GIAC "103" race fuel program with the 100? - can the ECU compensate when in the race fuel mode even though its 3 full points lower? - any detonation could be deadly at higher boost, etc. I also wonder if the race program can compensate for 91 if left in race mode (not that I would do it) just wondering the limits of octane compensation with the various settings (and if I can even use the 103 race program here in CA with the 100)

Thanks,

Bond

 

aint that the truth brutha! I swear to you... of the 8 GT2's we've done since September at the Stage IV level, I swear, EVERY single one had different measurements from the factory... Just like they were playing around for fun over there. Odd...

 

Many of the groupies on 6Speed (i'm a groupie too!) fret way too much on this octane issue...It may be one of the top ten topics on this site.
Theory dictates concern, reality is quite another matter!
Save the few long blasts from LaLa to Vag(ugly) or that one shot in Montana, our machines will rarely get an opportunity to significantly expose detonation as a source of engine failure.
Even in full race trim-cup cars all the way to 962's, Daytona (here in the states) was the rare times we need to be VERY carefull with octane quality. Of course we realize I'm discussing a minor octane disparity.
A few of my clients have been know to simply purchase a drum (55 gallons) of race fuel for a weekend "luvfest", when a challenge imposes itself.
a small momento-it's been my experience to say that whichever turbocharged version you run-when stuck for a lengthy time in heavy traffic, it would be VERY unwise to "let loose" with a heavy blast up to red line UNTIL you allow the intercoolers to do their job FIRST-that is-let several minutes of cool air rush through them before "stomping on it"!
The "knock control" cannot make up for that one- havenofundrivenoporschetakenochances-whylive? Mark

 

3 points down you would probably not get audible detonation but will have a knock count occurring. That in turn is going to pull the timing. Since the maps are not able to go as low in the race mode if the car continues to see knock it is going to force the throttle bodty closed to keep boost down in the intake. The car will continue to try and control the situation even though it is not favorable. If you are running the race program keep 100 octane in there. There is no other way to ensure the safety and longevity of the car if not.

 

Thanks Stephen - so even with 100 I will get a knock count? (3 points down) will it pull the timing even with 100 on the race program? At the end of your comments, you advise to keep 100 in there, but it sounds like even 100 will cause it to force throttle body closed, etc. on Race Program (GIAC)

Bond

 

No, not on a 100. There will be zero knock count. Try to run 95 on 100 program and yes, there will be knock count.

It will always pull timing if it needs to. There are several dozen ignition maps in the system to control knock and various issues.