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Post by casias on Nov 3, 2012 20:58:35 GMT -5
Video of engine running will soon follow. Jared from Current Performance did a great job of fully integrating the GM harness into the existing Dakota Fuse block. Unfortunately, the transmission has decided to go into "limp mode" and lock into 3rd gear. It probably needs to be recalibrated. I am leaving that to Jared.
Scott
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Post by casias on Nov 3, 2012 22:02:21 GMT -5
But in the meantime, enjoy the video of the LS engine dropping in, set to the Metallica song "fuel".
Scott
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Post by casias on Nov 4, 2012 8:49:30 GMT -5
Discovered why trans went to "limp mode". Code was reset. First drive very nice. It has a much different acceleration than magnum-style motor. VVT keeps torque strong all the way through the curve. I am not really pushing it yet, and the transmission was pushing a heavier truck, with much different gear ratio. I am probably going to have to tune the trans, and maybe change rear gears to 3.60 or 3.70 range. Cruises 65 mph at 2200 rpm.
Calculations are in order.
Scott
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Post by casias on Nov 6, 2012 6:40:12 GMT -5
Found bug with transmission and limp mode. Engine starts and runs no problem. Plan for today is 100 mile drive for fuel mileage. This will give us a good indication of overall efficiency, and possibly point out any drag in the drivetrain.
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Post by casias on Nov 9, 2012 15:06:59 GMT -5
Issues with the transmission have to do with load and torque settings. The drivetrain came out of a 3500 HD, which is much heavier than the Dakota. I think it is not seeing a high enough load to downshift, and is shifting too early when running up through the gears. It will reach 4th by 40 mph unless I have more than 50% throttle. Max throttle has only been 85% on all runs. The video represents the torque management settings holding the throttle to 85% and not letting the motor reach high rpm.
The 6L90 is fairly new and complex, and there aren't that many people with experience tuning them.
For now, I would suggest a 4L80 transmission, and a tuner who is pretty well versed in tuning them, or the Tremec T56/6060 setup for a manual transmission.
Motor runs fantastic, however. Driveline angles are very fine, and allow for a drop in the rear by 2" or so with no angle adjustment.
For fuel mileage, I will probably decrease the ring and pinion ratio, and give up some acceleration. Right now it drives like a small block with a 4.56, except for the excess shifting.
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