Decel fuel delivery, stoich @ 0% tps? WTF!
#1
Decel fuel delivery, stoich @ 0% tps? WTF!
So, i just drove to Phoenix from Salt Lake, and noticed that when i am off throttle (0% tps) and the rpms are above 3k, my wb reads stoich (14.7 afr, 1.0 lambda). Once rpms drop below 3k, it goes dead lean (no fuel delivery).
Why?!
Why would it be this way? Shouldn't any 0% tps readings be dead lean, with no fuel delivery? I dont understand why mitsu would do this. Any thoughts?
I'm sure this can be remedied in an open loop table somewhere, but just thought i would bring it up to the crowd, hopefully it hasn't been covered already.
Why?!
Why would it be this way? Shouldn't any 0% tps readings be dead lean, with no fuel delivery? I dont understand why mitsu would do this. Any thoughts?
I'm sure this can be remedied in an open loop table somewhere, but just thought i would bring it up to the crowd, hopefully it hasn't been covered already.
#2
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It's normal to be at 14 to 15 at Idel and pretty much the same a crusing speed!!
If I 'm not mistaken......That's what my wideband reads..
If you want I'll take some video on idel mixture......
If I 'm not mistaken......That's what my wideband reads..
If you want I'll take some video on idel mixture......
Originally Posted by eficker
So, i just drove to Phoenix from Salt Lake, and noticed that when i am off throttle (0% tps) and the rpms are above 3k, my wb reads stoich (14.7 afr, 1.0 lambda). Once rpms drop below 3k, it goes dead lean (no fuel delivery).
Why?!
Why would it be this way? Shouldn't any 0% tps readings be dead lean, with no fuel delivery? I dont understand why mitsu would do this. Any thoughts?
I'm sure this can be remedied in an open loop table somewhere, but just thought i would bring it up to the crowd, hopefully it hasn't been covered already.
Why?!
Why would it be this way? Shouldn't any 0% tps readings be dead lean, with no fuel delivery? I dont understand why mitsu would do this. Any thoughts?
I'm sure this can be remedied in an open loop table somewhere, but just thought i would bring it up to the crowd, hopefully it hasn't been covered already.
#3
Originally Posted by ant_turbo
It's normal to be at 14 to 15 at Idel and pretty much the same a crusing speed!!
If I 'm not mistaken......That's what my wideband reads..
If you want I'll take some video on idel mixture......
If I 'm not mistaken......That's what my wideband reads..
If you want I'll take some video on idel mixture......
What i'm talking about is Deceleration. Foot off the gas pedal. 0% TPS!
#4
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Mine goes dead lean at 0% TPS regardless of RPM (other than idle). I wonder if this is something new with the IX. Can anyone else verify that this happens in their IX or does not happen in their VIII as in my case?
-Paul
-Paul
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#10
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He's saying that with the driveline rotating the engine and the rpm's at 3000rpm that his wideband still reads 14.7:1. IE: the injectors are still working when he is coasting in gear.
#12
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Originally Posted by eficker
So, i just drove to Phoenix from Salt Lake, and noticed that when i am off throttle (0% tps) and the rpms are above 3k, my wb reads stoich (14.7 afr, 1.0 lambda). Once rpms drop below 3k, it goes dead lean (no fuel delivery).
Why?!
Why would it be this way? Shouldn't any 0% tps readings be dead lean, with no fuel delivery? I dont understand why mitsu would do this. Any thoughts?
I'm sure this can be remedied in an open loop table somewhere, but just thought i would bring it up to the crowd, hopefully it hasn't been covered already.
Why?!
Why would it be this way? Shouldn't any 0% tps readings be dead lean, with no fuel delivery? I dont understand why mitsu would do this. Any thoughts?
I'm sure this can be remedied in an open loop table somewhere, but just thought i would bring it up to the crowd, hopefully it hasn't been covered already.
There are several things that can contribute to that, there are probably even decel tables that we haven't documented yet that might also contribute to this.
#13
Mods: TBE, MBC, WGA. Thats it.
Off throttle, in gear and above 3k rpm, fuel is being delivered to the tune of 14.7:1.
I am running my stock mapping with different timing, mivec, all else is stock.
Perhaps a IX thing? I dunno, i know its probly not a ton of fuel (since it isn't actually being burned) but any fuel delivered on decel is a waste imo.
Off throttle, in gear and above 3k rpm, fuel is being delivered to the tune of 14.7:1.
I am running my stock mapping with different timing, mivec, all else is stock.
Perhaps a IX thing? I dunno, i know its probly not a ton of fuel (since it isn't actually being burned) but any fuel delivered on decel is a waste imo.