just got jet 2 issues

[Zygoat]

ok i just got my jet dst and im super excited. been playing with it and i have a couple of questions.
first (and hopefully the easiest)

in my normal torque reduction table there is an area where it randomly drops to 0%. this is how it was set from the factory. does anybody know whats up with this??? should i fix it? also brings up another question how does one average a cell to the surrounding cells?

here is a pic of the table and graph to give you an idea.


also is there any reason for torque management at all below a safety threshold. (ie. below 300ft/lbs, is there any way to damage any parts?) i realize it helps smooth out shifts but i am all for firm/hard shifts as long as their is no risk of breaking stuff. if this is true where would the cut off be?

[Zygoat]

second question

i recently modified my throttle body so that it essentially flows more air at the lower throttle angels than it did before but the same amount at wot or higher angles. (with out you knowing the specifics of the vehicle i cant tell you exactly what i did but i promise that is the result.)

the issue i am having is that from an idle if i give it a little gas (low throttle angle) it stumbles for a second and then revs up fine. it seems to be worse under load (ie driving) it bogs and stumbles for about a second before it revs up and takes of as normal. this does not happen if i peg the throttle (high throttle angle). i believe that i need to adjust the, main&backup ve tables, is this right? if so do i need to adjust anything else? what range/cells do i need to adjust. (it happens from idle to about 1000 rpm maybe a little over.)

another question my vehicle has 4 o2 sensors. yet when i look in the system calibrations their is a setting for "3rd o2 sensor enable" but it is turned off. why would this be? should i turn it on?

also there is a "high octane logic in p.e" option that is currently dissabled. i only ever run premium. should i enable this option? will there be any effect/ will i want to turn it back off when i go turbo?

i know i asked alot more than 2 questions but as i said i just got the software and am trying to figure everything out. i REALLY appreciate any help on any of the issues thanks in advance!

[camaro1]

just zero out the torque reduction table

[Zygoat]

anybody else have any ideas? i know its alot but if anyone can answer just 1 or 2 of the questions it will help.

[97K15004WD]

Originally Posted by Zygoat

second question

i recently modified my throttle body so that it essentially flows more air at the lower throttle angels than it did before but the same amount at wot or higher angles. (with out you knowing the specifics of the vehicle i cant tell you exactly what i did but i promise that is the result.)

the issue i am having is that from an idle if i give it a little gas (low throttle angle) it stumbles for a second and then revs up fine. it seems to be worse under load (ie driving) it bogs and stumbles for about a second before it revs up and takes of as normal. this does not happen if i peg the throttle (high throttle angle). i believe that i need to adjust the, main&backup ve tables, is this right? if so do i need to adjust anything else? what range/cells do i need to adjust. (it happens from idle to about 1000 rpm maybe a little over.)

Don't mess with the VE tables yet! What is the time delay in your PE tables? PE occurs after this delay is satisfied. Also, make sure your only increase at the correct cells....

[Zygoat]

well i already messed with the ve tables (trying to dial them in with the fuel trims) does the maf have to be disabled to do this? i got everything backed up so no big deal if i need to go back.

i looked at the pe delay table and it is 1 second only for 400rpm, which i think is probably too low for just off idle but its close. should i set them all to 0?

[rat]

Originally Posted by Zygoat

well i already messed with the ve tables (trying to dial them in with the fuel trims) does the maf have to be disabled to do this? i got everything backed up so no big deal if i need to go back.

Yes, maf needs to be disabled.

[97K15004WD]

yes, set to zero. then add to pe table a very small amout at a time until the stumble goes away. I would take your VE tables back to your saved values and start from there, AFTER you solve your stumble.

I have learned from many years of hard knocks, change one variable set at a time. This minimizes the complications of confounding variables....

BTW, have you ever tuned a carb vehicle? If so, this is a lot like that, but with different terminology and some combined. PE is similar to your pump squirter in a carb, provides momentary enrichment as the throttle opens....

[rat]

Originally Posted by 97K15004WD

yes, set to zero. then add to pe table a very small amout at a time until the stumble goes away. I would take your VE tables back to your saved values and start from there, AFTER you solve your stumble.

I have learned from many years of hard knocks, change one variable set at a time. This minimizes the complications of confounding variables....

BTW, have you ever tuned a carb vehicle? If so, this is a lot like that, but with different terminology and some combined. PE is similar to your pump squirter in a carb, provides momentary enrichment as the throttle opens....

PE doesn't provide a quick squirt, this is what causes the air fuel ratio to be richer than stoich at wot. Wot afr=14.7/pe value. It works any time the throttle is greater than the defined throttle value in the constants. It has nothing to do with the acceleration of the throttle, only the position.

[97K15004WD]

Agreed, not a quick squirt. It is analagous to a pump squirt, not a pump squirt. Without the separate pe tables, anytime there was a demand for additional instaneous fuel (beyond what the O2 sensors called for which was after the fact of the demand), the mixture would go momentarily lean and cause a stumble, after which the O2's would have corrected and the ratio should be back to whatever the tables are set for currently. In the carbs, the power shot (pump squirt) was adjusted by plastic cams and adjusted the delivery rate (and the total delivery was changed by the size of the pump itself; IIRC the RIO was 50 CC) and was a very painstaking procedure to get if defined properly. EFI is sooo much easier and less smelly!