More Tuning Questions!!!!
With the 110 LSA you need to set it up to idle in open loop. Do a search on HPtuners forum. The info is on there.
The starting is another issue.
Idle airflow needs to be correct. You may be opening the throttle blade enough for the IAC counts to be right, but the TPS voltage is too high, which adds more fuel, which causes it to surge. Viscous cycle. As FROST stated, the PCM will learn the new voltage as 0% closed throttle, but the voltage will bee too high, and still throw stuff off even if your scanner is reading 0% throttle opening. We still drill the throttle blades. Gets the IAC counts right, and doesnt throw off the TPS. Just my preference.
The starting is another issue.
Idle airflow needs to be correct. You may be opening the throttle blade enough for the IAC counts to be right, but the TPS voltage is too high, which adds more fuel, which causes it to surge. Viscous cycle. As FROST stated, the PCM will learn the new voltage as 0% closed throttle, but the voltage will bee too high, and still throw stuff off even if your scanner is reading 0% throttle opening. We still drill the throttle blades. Gets the IAC counts right, and doesnt throw off the TPS. Just my preference.
Originally Posted by edcmat-l1
With the 110 LSA you need to set it up to idle in open loop. Do a search on HPtuners forum. The info is on there.
The starting is another issue.
Idle airflow needs to be correct. You may be opening the throttle blade enough for the IAC counts to be right, but the TPS voltage is too high, which adds more fuel, which causes it to surge. Viscous cycle. As FROST stated, the PCM will learn the new voltage as 0% closed throttle, but the voltage will bee too high, and still throw stuff off even if your scanner is reading 0% throttle opening. We still drill the throttle blades. Gets the IAC counts right, and doesnt throw off the TPS. Just my preference.
The starting is another issue.
Idle airflow needs to be correct. You may be opening the throttle blade enough for the IAC counts to be right, but the TPS voltage is too high, which adds more fuel, which causes it to surge. Viscous cycle. As FROST stated, the PCM will learn the new voltage as 0% closed throttle, but the voltage will bee too high, and still throw stuff off even if your scanner is reading 0% throttle opening. We still drill the throttle blades. Gets the IAC counts right, and doesnt throw off the TPS. Just my preference.
Hey, I was really excited to find that info on HPTuners forum a little while ago... but I haven't had a chance to try it yet, and know lots that could benefit from it. Since I'm guessing you may have done it, I have a question..
I can see the open-loop idle thing working well on a stalled auto, but how is the transition back to closed-loop at 1200 or 1400 RPMS (1200 I'd imagine) with a 6-speed car? I wonder if it would stumble or feel odd? I've read that some have an issue with it not reporting OL when it settles back down to idle (monitoring status bit) after the initial climb out... are there any gotchas there?
Sorry for bending the topic around to answer my own question guys...
Originally Posted by Frost
Hey, I was really excited to find that info on HPTuners forum a little while ago... but I haven't had a chance to try it yet, and know lots that could benefit from it. Since I'm guessing you may have done it, I have a question..
I can see the open-loop idle thing working well on a stalled auto, but how is the transition back to closed-loop at 1200 or 1400 RPMS (1200 I'd imagine) with a 6-speed car? I wonder if it would stumble or feel odd? I've read that some have an issue with it not reporting OL when it settles back down to idle (monitoring status bit) after the initial climb out... are there any gotchas there?
Sorry for bending the topic around to answer my own question guys...
I can see the open-loop idle thing working well on a stalled auto, but how is the transition back to closed-loop at 1200 or 1400 RPMS (1200 I'd imagine) with a 6-speed car? I wonder if it would stumble or feel odd? I've read that some have an issue with it not reporting OL when it settles back down to idle (monitoring status bit) after the initial climb out... are there any gotchas there?
Sorry for bending the topic around to answer my own question guys...
As far as feeling the transition, on some cars, especially the ones that revert late, after stopping and idling, you can feel a slight change in idle. Not too bad.
I can understand if it doesn't revert till idle on the fall, I'm more curious as to how it feels accelerating normally from a stop. There's no stumble on an M6 (assuming spark transition is smooth and steady, etc)...?
Originally Posted by Frost
I can understand if it doesn't revert till idle on the fall, I'm more curious as to how it feels accelerating normally from a stop. There's no stumble on an M6 (assuming spark transition is smooth and steady, etc)...?
Originally Posted by Frost
Oh yeah, I agree, I want it in my pocket for the big cams with wild +trims down low.
There's several ways to get them to calm the fuel trims down. The open loop way is just one. You think ls1s are hard, try calming down a TPI speed density with 8 inches of manifold vacuum at idle. Holy shiznit!!! What a pain!! Once you figure it out though, its a "V8" moment!
Definitely a goody for the "bag o' tricks".....
