Factory ECU working as a 2 step
08-02-2005, 06:28 PM
#1
Factory ECU working as a 2 step I've seen people discuss this before but it seems like no one has ever gotten it to work. I'm not sure why, but here is what I did.
in HP tuners:
1. go to the fuel control tab/fuel cutoff DFCO
2. set the p/n cutoff RPM to desired rpm and resume to 1 rpms lower than it
3. go into cutoff RPM vs Gear and set the same for the p/n cuttoff and resume.
This is how it works. When you are light on the throttle it will come up to it's desired rpm and hold WITHOUT CUTTING FUEL. It acts like a soft limiter and works pretty well for street launches,. It won't build boost this way though. I see around 20" of vacuum when this way. As soon as I let the clutch out it goes into boost though and my launches are A LOT easier now.
If you go wide open throttle it will put a load on the engine and I'm able to build about 2psi at 3700 rpms bouncing off fuel cut. Doing a quick slip of the clutch the car leaves the line on about 6 psi and quickly shoots up from there, hard to keep it from spinning even on ET streets on the street unless I do a very quick slip. I get a little spin but no bog.
Clutch IN while stopped or moving = p/n limiter
Clutch OUT while moving = normal limiter setting
Clutch OUT while stopped = p/n limiter
in HP tuners:
1. go to the fuel control tab/fuel cutoff DFCO
2. set the p/n cutoff RPM to desired rpm and resume to 1 rpms lower than it
3. go into cutoff RPM vs Gear and set the same for the p/n cuttoff and resume.
This is how it works. When you are light on the throttle it will come up to it's desired rpm and hold WITHOUT CUTTING FUEL. It acts like a soft limiter and works pretty well for street launches,. It won't build boost this way though. I see around 20" of vacuum when this way. As soon as I let the clutch out it goes into boost though and my launches are A LOT easier now.
If you go wide open throttle it will put a load on the engine and I'm able to build about 2psi at 3700 rpms bouncing off fuel cut. Doing a quick slip of the clutch the car leaves the line on about 6 psi and quickly shoots up from there, hard to keep it from spinning even on ET streets on the street unless I do a very quick slip. I get a little spin but no bog.
Clutch IN while stopped or moving = p/n limiter
Clutch OUT while moving = normal limiter setting
Clutch OUT while stopped = p/n limiter
08-02-2005, 08:03 PM
#2
Launching!
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a buddy of mine tried the same thing in his turboed lightning except wired the p/n switch to a toggle so it would think it was in neutral but i think he had problems with reacting fast enough. I was thinking of trying it with my a4 but gave up glad to see yours working
