Ok guys, been a while since I updated anything on the truck.
Quick Flashback:
Last season my PB was a 1.7ish 60’ due to a tuning issue, but ran 6.81 at 103 on tune 2.
Off-season Changes:
We swapped to a higher pressure rail sensor (thinking the other one having so many miles and being pushed so hard was starting to flake on us a little) and went to a 10 bar map to be able to read boost accurately.
Also, my s*** 60’ wasn’t due to traction. The truck was stuck in torque management. So when the tune was rewritten to accommodate the new sensors, we also addressed that.
The final change we made was we loosened up the converter to -200 looser than stock.
Current time:
We went out for a quick TNT session last weekend. Everything seems to have worked as it should, and it seems (fingers crossed) that we have all the bugs worked out.
First pass we got the 60’ down to a 1.60 and went 6.91@101, still on tune 2. Spun a little on the launch (I think there was some water on the tires due to not being able to get around the water box). Also, I was shifting at around 4K rpm, and I heard the head lift on the 2-3 and 3-4 shifts.
Second pass I turned it up to tune 3, and it just chirped the tires, and did a 1.55 60’, running out to a 6.79@103. Also, I shifted at 4500rpm, and the head stayed down.
I’m not sure why the truck is going slower than last season (down 2mph at similar track conditions), could just be a fluke or due to how I was shifting (fmvb), or possibly the looser converter?... but nonetheless it was a good day.
With the tuning adjustments we seem to have cleared up the launch issues, got rid of the pop at the top end of the track we had seen (hopefully) and cut spool up time by more than in half.
I do have Viking dual adjustable shocks on the rear set at 8-10, and the tires had a lot of air (25 front 30 rear). Next time out I plan to air down just a tad. If it still spins a little I may bump up the compression setting a couple clicks. It seemed like the truck transferred really good, but once the weight went back it allowed the front tires to unload. I’ll also be doing 625s very soon so that the head lifting will be a thing of the past...
Anyways, sorry for rambling. Feel free to check out the link below for videos of everything. Skip ahead to about the 12:40 mark for pass breakdowns, the first half is just videos of other cars out there.
First Track Day of the Year! - YouTube
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