[Bubbles]

Originally Posted by jprall

There is a question of power falling off after 6K RPM. The short answer is yes. In fact because of the size of the turbos, revving past 6K has been described as simply making noise. Who knows, maybe someone else has figured out past 6K, but I figure I would confirm that question from my experience. Shift points and power band are really nice matched shifting at ~6K

I have not asked Steve directly but I don't think this is because he's playing it safe. I've seen my PSI at 13.8. If I had to describe it, I would put it as the software lets the turbos go full bore as soon as they can and as long as they can but they cannot continue to feed that kind of pressure past 6K. It's just my opinion, take it for what it is worth.

I do run 100 Octane Union 76 Gas exclusively (5.39/gal). Steve dynos with 93 octane which is what the rest of country gets. That's the dyno sheet I have. I haven't done a dyno run with 100 octane, but I will say the car absolutely loves the good stuff.

I have been glued to the bumper of a new 911 turbo all the way to 150mph (yeah, I looked down and said Holy S__t). A souped up GTO 6.0 was completely smoked from 60 to 130 twice. He just had to talk to me on the freeway about what I had. I told him it was too much to explain but turbos are cool.

Nice post. So you run 100 octane exclusively? How long does the car take to adjust to the 100 octane, as I may Dyno a tank of 100 octane this weekend.

[BoostedInPhx]

I am sorry my earlier post was not as clear as it should have been about bypassing the turbo since it was very late at night. It should have said the boost control solenoid for one of the turbos was bypassed. This means that the one turbo has all of the exhaust for its 3 cylinders driving the turbine all the time instead of bypassing some of the exhaust to regulate its speed and output. I believe v1.47 and JB2 both do this. The second turbo is then used to control the boost value. This was done to eliminate the CEL caused when the ECU was driving the boost solenoids at too high of a level and thinking there was a leak.

[WilyB]

Originally Posted by jprall

I have my own dyno sheets which came from Dinan's DynoPacks which are _____ than DynoJet. Insert higher or lower, depending on how your day is going.

You mean "DynaPack", not DynoPack I suspect?


http://www.mrtrally.com.au/performance/DynaPack.htm
http://www.dynapack.com/dynapack.html

[stressdoc]

Here is the explanation provided by Dinan for the power curve:

"- At higher boost settings in the higher RPM range the turbo exceeded the design RPM limit, shortening the lifespan of the turbo. Dinan addressed this problem by tapering boost gradually at high RPM. Future plans include adding larger turbo’s that can handle higher boost pressures at high RPM’s without compromising the durability of the turbo.

- At high boost, the compressor air temperature would exceed the intercoolers ability to cool the intake charge resulting in loss of power and compromising the long term durability of the engine. Dinan addressed this problem by tapering boost gradually at high RPM. Future plans include adding larger turbo’s and a more efficient intercooler so we can increase boost at high RPM’s without compromising the engine’s durability as well as dramatic additional increases in power."

[e46e92love]

Originally Posted by BoostedInPhx

I am sorry my earlier post was not as clear as it should have been about bypassing the turbo since it was very late at night. It should have said the boost control solenoid for one of the turbos was bypassed. This means that the one turbo has all of the exhaust for its 3 cylinders driving the turbine all the time instead of bypassing some of the exhaust to regulate its speed and output. I believe v1.47 and JB2 both do this. The second turbo is then used to control the boost value. This was done to eliminate the CEL caused when the ECU was driving the boost solenoids at too high of a level and thinking there was a leak.

Wow, my ignorance of the details of how these piggybacks work is exactly why I haven't bought one. Wow, now that you explain it that way I can't believe that is at all good for either Turbo.

[Helix Wildebeest]

Originally Posted by stressdoc

Here is the explanation provided by Dinan for the power curve:

"- At higher boost settings in the higher RPM range the turbo exceeded the design RPM limit, shortening the lifespan of the turbo. Dinan addressed this problem by tapering boost gradually at high RPM. Future plans include adding larger turbo’s that can handle higher boost pressures at high RPM’s without compromising the durability of the turbo.

- At high boost, the compressor air temperature would exceed the intercoolers ability to cool the intake charge resulting in loss of power and compromising the long term durability of the engine. Dinan addressed this problem by tapering boost gradually at high RPM. Future plans include adding larger turbo’s and a more efficient intercooler so we can increase boost at high RPM’s without compromising the engine’s durability as well as dramatic additional increases in power."

Here is what we saw:

[stressdoc]

That's it, I'm moving to Canada. My baby deserves cool weather.

[jprall]

Per Steve, the car takes 3 full 'idle to close to redline' pulls to figure out what kind of go juice it has in the tank. It figures it out really quickly. I screwed up yesterday and had to put exactly 1 gallon in to get to work today. 17 miles to get to work and it definitely lost some punch until I got back to spend my 75 bucks(!) to fill up. California gas sucks, really badly. I'm highly jealous of everyone else's 93.

[Bubbles]

Originally Posted by jprall

Per Steve, the car takes 3 full 'idle to close to redline' pulls to figure out what kind of go juice it has in the tank. It figures it out really quickly. I screwed up yesterday and had to put exactly 1 gallon in to get to work today. 17 miles to get to work and it definitely lost some punch until I got back to spend my 75 bucks(!) to fill up. California gas sucks, really badly. I'm highly jealous of everyone else's 93.

Three pulls to red line. Thanks for the info, however now I am having second thoughts about filling with 100 octane due to disappointment you are experiencing with regular gas (91), of course I will be heading back to 93 oct. Sounds like you opened Pandora's Box.

[jprall]

I think there is a big difference between California 91 and out of state 93(someone mentioned it was worth 25hp (crank/wheel dunno) in our cars). I bet the difference between 93 and 100 isn't relative to the octane numbers.

I would be stoked to see what you get with 100. I should dyno mine because I'm curious what the difference is. Remember Steve dynos with 93, I have that dyno sheet. His advertised numbers are also based on that.