Okay, overdue recap from the IDI Roundup and a day of racing in the truck. Last time the truck made some passes at the track the axle hop was horrible, eventually I will be building some proper traction bars but I wanted to experiment with clamping the overload springs to tighten up the spring pack and get less rebounding when the leafs unload off the line. I used some simple 3" u-bolt trailer spring hardware to clamp the overload like how the factory clamps the front of the springs.
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That really helped tighten up the rear end and actually made a huge improvement in the axle hop. I filled the nitrous bottle and had it setup for a hundred shot, but never used it. When we made it to the track the DA was still pretty high, I pulled the grille off to get more airflow over the intercooler and fuel cooler. I didnt change the tuneup at all from what I daily drive with, the procomp tires I set at 45 psi and didnt need to do a burnout to heat them up, they stuck really well off the line but the clutch did not. First pass coming right off the street was the best all night since the clutch just got worse throughout the night even after taking some power out to try and get it to hold. I didnt beat my personal best but had a great time, the track stuck really well and other than the clutch slipping mechanically had no dramas, even with hot lapping it with no engine fan. Heres the time slip for the first pass, and a video courtesy of
@Frankenwintch!
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Depending on what calculator you use, using the trap speed and vehicle weight horsepower is estimated between 325 and 375 at the wheels, about a hundred more than what people say the stock turbo will support, and this is still fuel only. As soon as my dyno guy has his dyno back up and going Ill be running this truck, a few customer trucks and a new project truck Ill be starting on soon. I won't have time to replace the clutch before then, so we will see how much it can hold on the loaded dyno.
Moving forward, I am hoping to schedule a week or two to go through the truck. I have a 38 gallon tank I will be installing, deleting all the stock fuel lines, running a sump with big fuel ports, building traction bars while the bed is off, installing a 13" southbend clutch, replacing the broken plastic headlight supports, installing a new rad, mounting the 105p near the rear tank to supply the GSL392 in the engine bay, and redoing the intercooler piping. The front end is in desperate need of some work, with 300k miles on it the ride has gotten pretty rough. I plan on replacing the springs in all four corners, lowering the truck down a bit, replacing the steering shaft and box, the clunking radius arm bushings, and the sagging body mounts. It also needs some electrical work, I want to put a headlight relay kit back in, and improve my gauge setup, but we will see how much time I get for any of that.