Nissan 370Z Forum - View Single Post

Denny McLain · 10-09-2009, 07:40 PM

Speechless again.

Spent 3.5 hours on the dyno again this afternoon. Not sure if the dyno sheet will download as it's a larger BMP that's giving me a hard time converting to a smaller JPEG. However, the car AFTER TUNING made 330.3 hp and 262.2 (std). A gain of over 13 hp from last session.

Man, was getting a complex about the car being an underachiever. Lots of smack, with nothing to back it up so this helps.

Basically made too many changes to put my finger on exactly what helped the most:

Under drive pulley
Opened up the front bumper so more air reached the Gen 3 filters
Oil cooler (99% chance of nothing at all)
downloaded new Cobb software
55 degree weather

The bottom line is for a change and this is the real good news, the car actually seemed to respond to different input. Going to go way out on a limb and say Cobb made some improvements.

All except two runs were fine tweaking the fuel/air (still needs some) but on two other runs we tried adding two degrees in which the car lost power and on another we took out two degrees and the car lost power again. Could be coincidence or something could be actually happening timing wise. Need to review the logs to see what happened.

Brought in reinforcements to help tune the car from a buddy whom has done this for a living for ten years and together we are going to go a little deeper into the software. An old dog can learn new tricks and pulling out timing around peak torque is normal and he usually plays a lot with the timing in that range. The car is still pulling out some in that range and the general consensus was detonation. Need to log the knock sensors to see what they are doing but next session we are going to focus on details and timing issues.

No time now, but tomorrow I'll go through the logs trying to connect the dots to see if changes in the timing really actually affect what was going on or it was simple an accident. The fuel/air worked for sure!!

10-09-2009, 07:40 PM	#128 (permalink)
Denny McLain Enthusiast Member Join Date: Feb 2009 Location: Double Oak Tx Posts: 255 Drives: 370Z, 96CE hotrod Rep Power: 16	Speechless again. Spent 3.5 hours on the dyno again this afternoon. Not sure if the dyno sheet will download as it's a larger BMP that's giving me a hard time converting to a smaller JPEG. However, the car AFTER TUNING made 330.3 hp and 262.2 (std). A gain of over 13 hp from last session. Man, was getting a complex about the car being an underachiever. Lots of smack, with nothing to back it up so this helps. Basically made too many changes to put my finger on exactly what helped the most: Under drive pulley Opened up the front bumper so more air reached the Gen 3 filters Oil cooler (99% chance of nothing at all) downloaded new Cobb software 55 degree weather The bottom line is for a change and this is the real good news, the car actually seemed to respond to different input. Going to go way out on a limb and say Cobb made some improvements. All except two runs were fine tweaking the fuel/air (still needs some) but on two other runs we tried adding two degrees in which the car lost power and on another we took out two degrees and the car lost power again. Could be coincidence or something could be actually happening timing wise. Need to review the logs to see what happened. Brought in reinforcements to help tune the car from a buddy whom has done this for a living for ten years and together we are going to go a little deeper into the software. An old dog can learn new tricks and pulling out timing around peak torque is normal and he usually plays a lot with the timing in that range. The car is still pulling out some in that range and the general consensus was detonation. Need to log the knock sensors to see what they are doing but next session we are going to focus on details and timing issues. No time now, but tomorrow I'll go through the logs trying to connect the dots to see if changes in the timing really actually affect what was going on or it was simple an accident. The fuel/air worked for sure!! Last edited by Denny McLain; 10-10-2009 at 10:36 AM.