Quote:
Originally Posted by iamheretolurk
Al, you're spot on! Stock 2.7 motor aside from full bolt ons 
The whole setup has definitely woken the car up from the dead, its a hoot to drive. |
you made some good choices.....headers and a sport muffler will typically get you to about 180 on a stock CIS 2.7S.....when you added ITBs you got another nice bump. That is awesome.
The start up files are typcailly good to get you up and running and then the tuning really begins.
The o2 controller/sensor, i provide either an Innovate or a 14point7, both use Bosch sensors and need to be setup properly in the Tunerstudio program. i prefer the 14point7, it tends to be more accurate and durable.
This is the setup for the 14poimt7 unit. Check to see that your setup matches this...i expect that it doesn't and that is causing the offset from the dyno unit. (the TunerStudio 14point7 defaul appears to be incorrect)
When it comes down to the choices between tuning modes, I will choose Speed Density (MAP/RPM) if there is a good MAP signal, which you will likely have with your mild cams. MAP is a better indication of engine load vs. Alpha-N which just uses the position of the butterflies (throttle), regardless of engine load. If the MAP signal is weak, I tune with Alpha-N.....both methods work well. For Accel Enrichment, I tend to use TPSdot, sometimes with a bit of MAPdot blend.
Nice job with the project Nick......your tune, although a little rough running/rich, dynoed at 168.6HP/153.4TQ....your tuner smoothed out the tune/AFRs and the after dyno run was 171HP/145.2TQ.......so not a big power gain, but much better drivability I'm sure. And that in my opinion, is the most important aspect of the tune...get as much power as you can....with good drivability. I've seen too many people go after the highest numbers they can get, for bragging rights, but sacrifice the tune somewhat where you use it most......your tuner was smart and did a great job.
Note: unless you have the EGO control turned on for closed loop control, the o2 sensor has no effect on how the engine runs....as it just reports the measured AFRs. ......Once you have the engine tuned, using the o2 sensor for tuning purposes, you could completely remove the o2 sensor and not effect the tune.
regards,
al