IFR table
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
IFR table
For anyone running 80lb injectors; would you mind looking at your IFR table and give me the 1st (0) and last (80) numbers?
I am trying to make sure my table is set up correctly. Seems high
Thanks
I am trying to make sure my table is set up correctly. Seems high
Thanks
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
True; But looking for a pattern and a few quick calculations based on the injector size they are running and it "seemed" mine were et up a little high
Just having some AFR issues and trying to look at everything.
Just having some AFR issues and trying to look at everything.
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
Posts: 8,124
Likes: 53
From: Earth, United States
Because an injector rated at 80 Lbs @ 43.5 psi is going to flow more @ the LS1 base fuel pressure of 58 PSI. Looks like your IFR numbers you have in your table are at 58 psi. (Base LS1 fuel pressure)Check this out..
Last edited by MVP'S ZO6; Oct 24, 2015 at 02:42 AM.
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Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
Yes guys, thanks
They are rated at 80 at 43.5 and I'm running 58psi. I calculated them with the hp tuner tool and got the 92 at zero. It seemed high per others but close) The spread was also got my attention. Per my tuning manual, I take the spread from high to low of my original table (2.79) and add that to the 92.x and put in the 80 area and interpolate between. My 80 table was originally 104, for a difference of 12.xx), thus my concern
I am having an issue with the AFR going back and forth (slowly) from about 11.xx to 18 at steady throttle. It appears my O2s (brand new) are not oscillating fast enough, but instead, SLOWLY go from high to low causing the rich lean condition.
Always something
They are rated at 80 at 43.5 and I'm running 58psi. I calculated them with the hp tuner tool and got the 92 at zero. It seemed high per others but close) The spread was also got my attention. Per my tuning manual, I take the spread from high to low of my original table (2.79) and add that to the 92.x and put in the 80 area and interpolate between. My 80 table was originally 104, for a difference of 12.xx), thus my concern
I am having an issue with the AFR going back and forth (slowly) from about 11.xx to 18 at steady throttle. It appears my O2s (brand new) are not oscillating fast enough, but instead, SLOWLY go from high to low causing the rich lean condition.
Always something
Melting Slicks
Joined: Jan 2008
Posts: 2,590
Likes: 48
From: Nathalie VA
St. Jude Donor '15-'16-'17-'18
I remember reading something a while back about a guy who replaced his O2's with some brand from the parts store and something similar happening. Don't quote me on this, but maybe someone will chime in that has more knowledge than me.
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
Posts: 8,124
Likes: 53
From: Earth, United States
Not all replacement 02 sensors are created =. That's for sure.
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
If you command OL what's your error% looking like?
I have not tried commanding an AFR. I didn't have the wideband hooked up to HP. I was noticing the big AFR swing so I hooked up HP to take a look at the STFTs and noticed my O2s were barely moving. I purchased the new ones and then noticed that they were completely opposite and just swinging high and holding, then swinging low and holding. Figured I needed to figure out that issue or it would never run correctly
Burning Brakes
Joined: Aug 2010
Posts: 771
Likes: 40
From: killeen TX
No chance of that. I have the harnesses zip ties right above the header with no room for them to reach the other
If you command OL what's your error% looking like?
I have not tried commanding an AFR. I didn't have the wideband hooked up to HP. I was noticing the big AFR swing so I hooked up HP to take a look at the STFTs and noticed my O2s were barely moving. I purchased the new ones and then noticed that they were completely opposite and just swinging high and holding, then swinging low and holding. Figured I needed to figure out that issue or it would never run correctly
If you command OL what's your error% looking like?
I have not tried commanding an AFR. I didn't have the wideband hooked up to HP. I was noticing the big AFR swing so I hooked up HP to take a look at the STFTs and noticed my O2s were barely moving. I purchased the new ones and then noticed that they were completely opposite and just swinging high and holding, then swinging low and holding. Figured I needed to figure out that issue or it would never run correctly
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
I highly recommend getting your wideband plugged into the EIO and setting up an AFR error % histo. When I say commanding OL. That means forcing it to stay in open loop mode and taking the narrowbands out of the equation. If you're chasing your tail in OL mode then it's something in the calibration. I already have a few ideas what I think it is, but good logs are needed to verify.
I will be back Friday, and Ill try to get a chance to work on it and get a log.