Feedback on powerlogger file

crvogt

Member
Joined
Jul 6, 2017
Hi folks,

I've just made a lot of changes to my 87 GN and the car's running rich. Changes include TT chip, hotwire, 255pump, TA49, LT1 MAF, 42lb injectors, TAperformance headers and 3" dp, wideband A/F gauge,. I just installed a powerlogger and I'm not sure how to interpret it. A./F is dropping below 10 and less than half throttle, which makes me think MAF, O2, or major leak?

I've attached a log file, so if anyone has time (yeah right) and wouldn't mind helping me out, I'd appreciate it. Still learning and trying to work on the car myself.
 

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You guys are gonna drive me to drink. Your TPS is 46...bring it down to 42. BLM's are 118 at 850 RPM which is fine. My two race engines came in at 118 and 122...no biggie. You're not recording boost. Boost level? I'm seeing 3.5 for KR at 3500 but it falls off so it appears it 'heard' something. Fueling is all over the place. You need to verify FP is rising 1 to 1 with boost. What have you got all the switches set to in the Translator. Were you completely honest with Eric when you ordered the chip...as in you didn't suddenly go to a bigger turbo. You selected the correct WB in the drop down box. IDC is at 61 at 3600 RPM when you got out of it. What did you tell Eric was your max boost.
 
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You guys are gonna drive me to drink. Your TPS is 46...bring it down to 42. BLM's are 118 at 850 RPM which is fine. My two race engines came in at 118 and 122...no biggie. You're not recording boost. Boost level? I'm seeing 3.5 for KR at 3500 but it falls off so it appears it 'heard' something. Fueling is all over the place. You need to verify FP is rising 1 to 1 with boost. What have you got all the switches set to in the Translator. Were you completely honest with Eric when you ordered the chip...as in you didn't suddenly go to a bigger turbo. You selected the correct WB in the drop down box. IDC is at 61 at 3600 RPM when you got out of it. What did you tell Eric was your max boost.
I'm drinking already😂
 
You guys are gonna drive me to drink. Your TPS is 46...bring it down to 42. BLM's are 118 at 850 RPM which is fine. My two race engines came in at 118 and 122...no biggie. You're not recording boost. Boost level? I'm seeing 3.5 for KR at 3500 but it falls off so it appears it 'heard' something. Fueling is all over the place. You need to verify FP is rising 1 to 1 with boost. What have you got all the switches set to in the Translator. Were you completely honest with Eric when you ordered the chip...as in you didn't suddenly go to a bigger turbo. You selected the correct WB in the drop down box. IDC is at 61 at 3600 RPM when you got out of it. What did you tell Eric was your max boost.
Thanks for the reply.

- I'm wiring the boost in this week.
- Max boost is 15psi, which is what I'm seeing
- No reason to lie to Eric, but I did get a bigger turbo AND asked him if I needed a new chip. I would expect the car to go lean if the turbo was to big, no?
- Correct WB in drop down box? Missed that, but the values correspond to what I was seeing on the gauge.
- MAF Translator is set to ON ON ON OFF
-When you say fueling is all over the place, what are you looking at? Sounds like first step is to verify fuel pressure.

Well, send me your address and I'll send you some Scotch for your trouble :)
 
You went with a bigger turbo, so you're sucking the chip dry. The larger turbo flows more air so it needs more fuel via the chip. What version chip are you running? And what are the knobs set to in the Translator? Chip needs to be reburned for the new turbo.
 
You went with a bigger turbo, so you're sucking the chip dry. The larger turbo flows more air so it needs more fuel via the chip. What version chip are you running? And what are the knobs set to in the Translator? Chip needs to be reburned for the new turbo.
From Eric

"You should be able to use the same chip in your case. I’m showing you were using 91 octane, which will limit your boost to around 15psi or so. So we likely don’t need to add any fuel for the bigger turbo."

Why wouldn't a bigger turbo lead to leaner conditions, Ie., fuel system can't keep up with the amount of air?

The knobs are set to 0, but I attached an image just in case.
 

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Before you did all those mods, how did it run? Why did you go with 42lb injectors? 60s are the standard now and Eric has them down pat. They are also good for 11s, more with alky.
 
Why wouldn't a bigger turbo lead to leaner conditions, Ie., fuel system can't keep up with the amount of air?
Unless you put on a huge turbo, at 15psi you won't be pushing enough air to need fueling much different from a stocker. As the boost goes up though it will need much more fuel. If you can only get 91, you will need alky or E85 to go much higher than 15 anyway.
 
MAF needs to be on 0 if it's an 3.5 LT1...if it's a 3 inch it needs to be on 3. WOT 0. In my experience going to a larger turbo it'll need to be reburned for the larger turbo for more fuel. Are you running 5.7 or 6.1?
 
Is the adjustment rod on the 49 threaded? If it is, have you got it backed off as far as possible? The HD actuators start off about 15-16 pounds.
 
Before you did all those mods, how did it run? Why did you go with 42lb injectors? 60s are the standard now and Eric has them down pat. They are also good for 11s, more with alky.
It ran as well as it does now, except I have gauges, powerlogger, and scanmaster :) To be fair I had the scanmaster on briefly and saw under WOT there was some knock. I went with the 42s because I didn't know any better at the time. 60s were out of stock, and living in California I thought I'd still be able to keep it smoggable with 42s (no longer an issue though). This was a couple years ago now and only recently installed them.

Unless you put on a huge turbo, at 15psi you won't be pushing enough air to need fueling much different from a stocker. As the boost goes up though it will need much more fuel. If you can only get 91, you will need alky or E85 to go much higher than 15 anyway.
It's a TA49 with the stock exhaust housing.
 
MAF needs to be on 0 if it's an 3.5 LT1...if it's a 3 inch it needs to be on 3. WOT 0. In my experience going to a larger turbo it'll need to be reburned for the larger turbo for more fuel. Are you running 5.7 or 6.1?
Huh. I didn't realize the dials needed to be changed. thanks. It's a 5.7 chip.

Is the adjustment rod on the 49 threaded? If it is, have you got it backed off as far as possible? The HD actuators start off about 15-16 pounds.
It is threaded, and I'm running a RJC boost controller. I set it such that I needed to pull the rod ~1/8in our to connect to the wastegate. Could it be it's not holding pressure -> richer A/F? Definitely got to get the boost logged...

Edit: I haven't seen boost go over 15psi, but I haven't experimented with the adjustment rod outside setting it as I mentioned.
 
Read your Translator instructions. Leave it at 15 PSI. I'm betting if you add 10 percent high gear fuel it'll richen up. If it does, then the chip hasn't got enuf fuel on default. I have a vid on my channel how to adjust fuel/timing with 5.7. Toss a new Denso 02 sensor in it. If it's not working correctly, then the ECM can't set the fueling correctly.
 
Read your Translator instructions. Leave it at 15 PSI. I'm betting if you add 10 percent high gear fuel it'll richen up. If it does, then the chip hasn't got enuf fuel on default. I have a vid on my channel how to adjust fuel/timing with 5.7. Toss a new Denso 02 sensor in it. If it's not working correctly, then the ECM can't set the fueling correctly.
Pfff, are you kidding, I love your channel. I've learned a ton (and clearly still only scratching the surface).

I'm just surprised at how rich it is currently running based on the wideband. I think O2 sensor's a good idea, and checking fuel pressure with boost. Yeah, I'll read the instructions... (or even just look at the cover which says set base to 3...)
 
What was the outside air temperature when you made this PL log? I'm seeing coolant around 153 and some IAT's in the mid 50's.
 
Pfff, are you kidding, I love your channel. I've learned a ton (and clearly still only scratching the surface).

I'm just surprised at how rich it is currently running based on the wideband. I think O2 sensor's a good idea, and checking fuel pressure with boost. Yeah, I'll read the instructions... (or even just look at the cover which says set base to 3...)
It's running rich
Because of the boost range
The stocker will move the air sooner than a 49.
 
Coolant on one of the times you brought it up to 3500 is only 142. I'm wondering if the low coolant temp is messing with the fueling in the chip. Eric brings the fan on about 165.
 
From Eric

"You should be able to use the same chip in your case. I’m showing you were using 91 octane, which will limit your boost to around 15psi or so. So we likely don’t need to add any fuel for the bigger turbo."

Why wouldn't a bigger turbo lead to leaner conditions, Ie., fuel system can't keep up with the amount of air?

The knobs are set to 0, but I attached an image just in case.
You wont move any more air at 15psi
It's the spool time that is different between the 49 and the stocker.
 
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