tillman speed
Member
That's exactly it. It's all that's left. I wanna go over the wiring on everything with a fine tooth comb.
Intermittened power loss (HP)
- Thread starter 05bluestang
- Start date
That's exactly it. It's all that's left. I wanna go over the wiring on everything with a fine tooth comb.
69Mach1-409
Senior Member
Sounds like fun! Good Luck Chris!
tillman speed
Member
Ugh, thanks! LOL
You ready for big Whipple numbers?!
You ready for big Whipple numbers?!
69Mach1-409
Senior Member
I've been reading threads and watching dyno Vids sense last week! Cannot wait! 
*Sorry for the mini threadjack*
*Sorry for the mini threadjack*
05bluestang
Resident Riceburner Kille
05bluestang
Resident Riceburner Kille
CR, what about the comment on the O2 sensor? Think it may be possible?
I just want to knock as many things out as possible before I bring it back to you (for both our sanity)
tillman speed
Member
CR, what about the comment on the O2 sensor? Think it may be possible?
I just want to knock as many things out as possible before I bring it back to you (for both our sanity)
Maybe it's because it's the last half of the week and I'm retarted by Wednesday evening, but I just read through the whole thread and couldn't find the o2 sensor comment. The o2 sensors from what I see are fine, they're switching during closed loop, warm up pretty quickly, show commanded air/fuel ratio at WOT, etc. I think they're doing good. I didn't monitor actual o2 voltage, but the trims usually reflect any o2 issues. Yours are consistent, tight bank to bank, good to go IMHO.
Chris
05bluestang
Resident Riceburner Kille
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69Mach1-409
Senior Member
05bluestang
Resident Riceburner Kille
That may be a good idea...................Maybe I should reschedule my dyno run for Monday!
tillman speed
Member
Ahh... this?
I wish it were that easy.
Your o2 sensors send feedback to the PCM which generates what we call "fuel trims". These are the percentages that the computer calibration is off in order to obtain a perfect air fuel ratio at part throttle and idle (called "closed loop"). Basically your "fuel trims" are what the upstream 02 sensor reads and thats why you'll hear it called a "narrowband" o2 reading, because it's only accurate for such a short window. They're working great because your "fuel trims" are within 3% at all times throughout the whole scale. This is very good. It's because we took the transfer function (the table that controls the fuel trims accuracy) from TECHCO who built their transfer function in a labratory, so it's dead-nuts accurate. We had to skew it lightly for a few of your modifications, but the curve was right, just needed to be shifted a few percent.
The WOT air/fuel ratio isn't controlled by the upstream oxygen sensors. Regardless, the air/fuel ratio at WOT is perfect, so we don't have to worry about it. Fuel pressure was good, everything else looked wonderful.
I think we're going to laugh when we find out what it is. Your datalogs are picture perfect, though. I'd be willing to post them up if you don't care so that everyone can see that it was calibrated correctly.
Chris
tillman speed
Member
LOL thats reaaaaaaaaaaal nice, fellas! 
05bluestang
Resident Riceburner Kille
Ahh... this?
I wish it were that easy.
Your o2 sensors send feedback to the PCM which generates what we call "fuel trims". These are the percentages that the computer calibration is off in order to obtain a perfect air fuel ratio at part throttle and idle (called "closed loop"). Basically your "fuel trims" are what the upstream 02 sensor reads and thats why you'll hear it called a "narrowband" o2 reading, because it's only accurate for such a short window. They're working great because your "fuel trims" are within 3% at all times throughout the whole scale. This is very good. It's because we took the transfer function (the table that controls the fuel trims accuracy) from TECHCO who built their transfer function in a labratory, so it's dead-nuts accurate. We had to skew it lightly for a few of your modifications, but the curve was right, just needed to be shifted a few percent.
The WOT air/fuel ratio isn't controlled by the upstream oxygen sensors. Regardless, the air/fuel ratio at WOT is perfect, so we don't have to worry about it. Fuel pressure was good, everything else looked wonderful.
I think we're going to laugh when we find out what it is. Your datalogs are picture perfect, though. I'd be willing to post them up if you don't care so that everyone can see that it was calibrated correctly.
Chris
I don't care you can post them if you want. I agree, it's most likely something stupid that nobody would have thougt of looking at in a million years
irishpwr46
Official Site Vandal
any luck with this yet?
05bluestang
Resident Riceburner Kille
Nope, not yet. I found some bare wires on the TB Motor plug, but that was not it
. I a little while I am going to put a KB Boost-A-Spark module on it and see if it changes anything when the coil voltage goes up. 
tillman speed
Member
http://www.tillmanspeed.com/boards/htechco/Retune_WOT_3.csv
Here is the datalog you asked for on the last time you were here. These runs were at almost 22 degrees of timing trying to find out why you weren't making power. You're back down to about 18-19 degrees now.
I'll post the dynojet run here shortly.
Here is the datalog you asked for on the last time you were here. These runs were at almost 22 degrees of timing trying to find out why you weren't making power. You're back down to about 18-19 degrees now.
I'll post the dynojet run here shortly.
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69Mach1-409
Senior Member
Hey Chris, you got my dyno sheet and stuffs from my run buddy?
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