Hi,
Just wondering if I could get a little feedback/insight into a couple issues I'm having with tuning. I'm self tuning my N54 (FBO with RBs) using a Cobb and Procede but I'm a very amateur tuner. Therefore I'm only really adjusting a few of the tables within the Cobb and Procede, mainly boost/load, timing, fuel, fuel scalar, OL fueling, methanol, etc. Not really touching much else and have left them on whatever the Cobb OTS E30 race map settings were.
I just recently did a map revision after finally fixing my AFR issue. I was getting consistently richer (by 1 point) AFRs in bank 2 even after replacing all 4 O2 sensors. I needed to get a workshop to reset my fuel trim adaptations using Autologic as neither the Cobb or Procede was able to do it.
Here's a link to the logs.
http://www.datazap.me/u/froop/201409...11&zoom=17-177
http://www.datazap.me/u/froop/201409...-6-7-8-9-10-11
Logs were done in 3rd gear. I'm targeting 21psi on the Procede between 4000 to 6000 RPMs, tapering to 18 at 7000 but I'm not taking the logs all the way to redline due to SMFW related misfires past 6200 RPMs. For timing on the Cobb, I'm targeting 14.5 degrees at redline, ramping up gradually from 10 at around 2000RPMs.
There are a few things to note/issues that I can see on the logs and I could use a little feedback/help for some of them with figuring out the causes and possible actions to rectify them.
1. I'm losing traction in the middle of the pull each time which unfortunately I can't do much about and doesn't help with getting a clean log.
2. I'm not always hitting the targeted boost. It doesn't stay at 21 when it should. I'm assuming for this I'll need to start fiddling with the WGDC map on the Procede and can probably leave the Cobb tables alone?
3. There is a fuel trim disparity which I can only assume is to do with uneven methanol flow however AFRs are quite even so I'm not too worried about it. The AFRs are a bit richer than I am targeting (e.g. 12.2 when they should be 12.5) which I think is because I'm flowing too much fuel before the OL fueling gets a chance to pull it. I plan on reducing the OL Fueling value in the Procede to compensate for this.
4. Whenever I begin a pull the car appears to run lean (16-17:1) before there is a sharp spike in the fuel trims to compensate and bring this back in line. What could be the cause of this?
5. I'm not meeting my timing targets, despite having no throttle closures and no ignition corrections (other than the drop on the 2nd pull which I think is due to loss of traction). They're about 0.5 to 1 degree lower than my target. What could be the cause and what can I change to help the car meet targets? Although I haven't logged IATs I am quite certain that this wouldn't be one of the causes as I flow quite a significant amount of meth and IATs typically drop from 70-90 degrees at the beginning of a pull to 40-50 degrees during the course of a normal pull.
Thank you in advance for any help :)
Alex
Just wondering if I could get a little feedback/insight into a couple issues I'm having with tuning. I'm self tuning my N54 (FBO with RBs) using a Cobb and Procede but I'm a very amateur tuner. Therefore I'm only really adjusting a few of the tables within the Cobb and Procede, mainly boost/load, timing, fuel, fuel scalar, OL fueling, methanol, etc. Not really touching much else and have left them on whatever the Cobb OTS E30 race map settings were.
I just recently did a map revision after finally fixing my AFR issue. I was getting consistently richer (by 1 point) AFRs in bank 2 even after replacing all 4 O2 sensors. I needed to get a workshop to reset my fuel trim adaptations using Autologic as neither the Cobb or Procede was able to do it.
Here's a link to the logs.
http://www.datazap.me/u/froop/201409...11&zoom=17-177
http://www.datazap.me/u/froop/201409...-6-7-8-9-10-11
Logs were done in 3rd gear. I'm targeting 21psi on the Procede between 4000 to 6000 RPMs, tapering to 18 at 7000 but I'm not taking the logs all the way to redline due to SMFW related misfires past 6200 RPMs. For timing on the Cobb, I'm targeting 14.5 degrees at redline, ramping up gradually from 10 at around 2000RPMs.
There are a few things to note/issues that I can see on the logs and I could use a little feedback/help for some of them with figuring out the causes and possible actions to rectify them.
1. I'm losing traction in the middle of the pull each time which unfortunately I can't do much about and doesn't help with getting a clean log.
2. I'm not always hitting the targeted boost. It doesn't stay at 21 when it should. I'm assuming for this I'll need to start fiddling with the WGDC map on the Procede and can probably leave the Cobb tables alone?
3. There is a fuel trim disparity which I can only assume is to do with uneven methanol flow however AFRs are quite even so I'm not too worried about it. The AFRs are a bit richer than I am targeting (e.g. 12.2 when they should be 12.5) which I think is because I'm flowing too much fuel before the OL fueling gets a chance to pull it. I plan on reducing the OL Fueling value in the Procede to compensate for this.
4. Whenever I begin a pull the car appears to run lean (16-17:1) before there is a sharp spike in the fuel trims to compensate and bring this back in line. What could be the cause of this?
5. I'm not meeting my timing targets, despite having no throttle closures and no ignition corrections (other than the drop on the 2nd pull which I think is due to loss of traction). They're about 0.5 to 1 degree lower than my target. What could be the cause and what can I change to help the car meet targets? Although I haven't logged IATs I am quite certain that this wouldn't be one of the causes as I flow quite a significant amount of meth and IATs typically drop from 70-90 degrees at the beginning of a pull to 40-50 degrees during the course of a normal pull.
Thank you in advance for any help :)
Alex