Will it work for an auto car or am I hoping for too much
I have my factory ECU working as a 2 step
I have my 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.
I just figured this out tonight so I have not been able to go to the track.
Hope this info helps some others. It really lets me concentrate on the launch and they have been much harder than before.
I just figured this out tonight
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.
I just figured this out tonight so I have not been able to go to the track.
Hope this info helps some others. It really lets me concentrate on the launch and they have been much harder than before.
I just figured this out tonight
Nope car pulls through the brakes with no problem, no boost built at all. Brakes are brand new as are the rotors. I have a Vigilante 3800 stall, and I'd thought brake boosting would be cake with it, but nope...car just pulls through its brakes and E brake too
it will go past the set point after you launch it right?
im having a hard time seeing how it will rev out to the entire RPM band with that setting? i trust it will can you explain to me how?
im having a hard time seeing how it will rev out to the entire RPM band with that setting? i trust it will can you explain to me how?
Originally Posted by frcefed98
Nope car pulls through the brakes with no problem, no boost built at all. Brakes are brand new as are the rotors. I have a Vigilante 3800 stall, and I'd thought brake boosting would be cake with it, but nope...car just pulls through its brakes and E brake too
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i was just taking wiht redhardsupra about this the other night and was going to try it. so just adjust the p/n settings and thats it? is it bad to be hitting the limiter on the line like that?
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Think I will wait for an A4 to try this first, if not, will attempt it Wed on the way to the track. I cant see how it will work, kind with Slowhawk on this one. I feel dupid....easel and crayons anyone?
Thinking out loud...fuel cuts off, at say 2200rpm, resume 2199. I step on the brake, slowly rev up to or beyond 2200, PCM maintains the 2200 as it is cutting fuel, and then I am supposed to be able to go WOT and launch. How do I get to WOT if the fuel is being cut after 2200rpm? And I am assuming A4's wouldnt need to adjust the P/N parameter since the A4 would be in gear sitting at the light?
Thinking out loud...fuel cuts off, at say 2200rpm, resume 2199. I step on the brake, slowly rev up to or beyond 2200, PCM maintains the 2200 as it is cutting fuel, and then I am supposed to be able to go WOT and launch. How do I get to WOT if the fuel is being cut after 2200rpm? And I am assuming A4's wouldnt need to adjust the P/N parameter since the A4 would be in gear sitting at the light?
thats the only thing im wondering about is the take off. ill give mine a shot today and see what goes on. i guess what really depends is what conditions have to be met to let it shut off. p/n, so does that mean as soon as you hit 1 mph it goes away? once the clutch is let our the rpms will drop and it shoudl be fine im thinking but an auto with a stall wont dip like that so they would be stuck i would think.
Originally Posted by WS6FirebirdTA00
so if i sit still with the clutch out i can rev normal then? or no. like i said ill try and post up if it works for me.
Last edited by Zombie; Aug 2, 2005 at 12:20 AM.
will this not cause a lean condition causing detenation?
and or possibly knock?
i tried this last night works like a champ, but just curious if it will hurt anything by cutting fuel.
and or possibly knock?
i tried this last night works like a champ, but just curious if it will hurt anything by cutting fuel.
TECH Enthusiast
Joined: Mar 2004
Posts: 697
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Originally Posted by fitz98ta
will this not cause a lean condition causing detenation?
and or possibly knock?
i tried this last night works like a champ, but just curious if it will hurt anything by cutting fuel.
and or possibly knock?
i tried this last night works like a champ, but just curious if it will hurt anything by cutting fuel.
Originally Posted by EightBallTTA
Read his first post again, it doesn't cut fuel... I would think using this method along with cataltic converters would cause a little bit of a..."firey"...situation??
I have not seen any detonation or any issues from doing this and my car is scanned all the time.
P.S. I did this to another STS car on a 67 turbo and he built 6 psi within 5 seconds.
TECH Enthusiast
Joined: Mar 2004
Posts: 697
Likes: 0
Originally Posted by Zombie
actually it does cut fuel under higher load. If you keep it light then it doesn't. At least that's what my log says.
I have not seen any detonation or any issues from doing this and my car is scanned all the time.
P.S. I did this to another STS car on a 67 turbo and he built 6 psi within 5 seconds.
I have not seen any detonation or any issues from doing this and my car is scanned all the time.
P.S. I did this to another STS car on a 67 turbo and he built 6 psi within 5 seconds.
