I say no because ECU can't see anything above 14.7psi with a 2 bar map but
http://www.turbododge.com/forums/f4/...sket-p445.html
I looked at the calibration file, I didn't find anything...
ShelGame? 5DIGITS? Any input from anyone?
I say no because ECU can't see anything above 14.7psi with a 2 bar map but
http://www.turbododge.com/forums/f4/...sket-p445.html
I looked at the calibration file, I didn't find anything...
ShelGame? 5DIGITS? Any input from anyone?
The key word here is 'secret bleeding'. See this antiquated article on it:
http://www.thedodgegarage.com/turbo_map.html
I could imagine putting in one of these boost bleed devices on the car and the car assumes you are going the max boost (perhaps it only sees 14.7 psi) and going full rich. Sure, maybe the Stage II module will support it by going full rich for 10 seconds before hitting overboost shutdown. The problem still is the computer does not know what the boost is, nor does it have the proper fueling for it. So going 17 psi isn't a problem, just as long as you don't detonate.
Pretty sure I was running 16psi on a StageII GLHS w/ overboost disabled years ago. Might have been 15. I had no issues.
Ouch! Making a guy feel old!
FYI- With the advent of being able to go into the code and shut off the overboost or extend the timer function its a much better option than playing with a diode or bleed on the map sensor line.
Another FYI- The 87 GLHS, CSX and Shelby Z has a weak wastegate spring that prevents it from boosting much over 14 psi *in stock form*, think of it as an extra safety. You are not going to see big boost numbers which can hurt an engine fast compared to 89 big can wastegate.
Gary
Working on clearing the decks.
I have run considerably more boost than 14.7 PSI with my stage II DC 85 logic module (Spearco intercooled). Never being in any one gear for more than a few short seconds. I would lift during shifts, so the overboost timer would reset at each gear change. Early on, I would many times hit overboost just short of finish line when going through the lights in 4th gear. I learned quickly way back when to run a more RPM in each gear so I wouldn't hit overboost in 4th. This of course was aeons before the use of zener diodes or any custom calibration.
Mine and my friends 86 and 87 GLHS (with stage II LM) acted the same way. It would run pretty much as much boost as you could throw at it, but only for a very short time. IIRC it was less than ten seconds. No way would I have ever been in 4th gear for 10 seconds.
Todd
The GLHS Stage II is set for 13.7psi. But, it does seem to have overboost essentially turned off. You will never get to the point that the OB timer even starts.
So, yes it's possible the race teams 'bled' the boost up to 17psi. But, it never would shut down. I wonder if there's extra code in there I missed...
My experience with the STG2 LM in my GLHS mirrors Todd's, with the car shutting down after short while over 14 psi. A nice long 4th gear pull on the dyno at 17psi or shortly before the lights at the track the car would lay down.
FWIW the original/PO of the car, the service manager at the Omaha dealership where it was sold, said he picked up the LM as soon as they were being offered.
“If the people of the nation understood our banking and monetary system, I believe there would be a revolution before tomorrow morning.” -Henry Ford
I had an old Neil Emiro switch cal that had stock Stage II on one setting that had the overboost on and it did the same thing as you guys describe. On the other setting the overboost was disabled somehow and it would never hit it. Pretty sure I shimmed the small can wastegate and ran 16psi.
There are timers related to overboost and they were desensitized but not disabled in higher boost/performance cals.
Although, why would anyone run boost levels beyond the capable limit of the sensors and electronics when there are more available options today, to do it properly, vs the "yestertech" of a diode??