I'm trying to figure out whats going on with my truck. A few weeks ago I went to the track and ran 3-13.3's on radials and a 13.2 on DR's all at 103 and almost 104 mph. This was done in 50 degree weather. Last week I put on my brand new ET streets only to run 13.6,13.7,13.8 all at 99 mph. The air was bad,but that is alot to lose from that alone. Tonight I ran a 13.8 at 98 with the ET's right out of the box. I decided to swap to my radials just to see. My first clean pass(broke lose at half track on first pass)I picked up to a 13.7 at 99,then a 13.5 at 100,and a 13.4 at 102.5. I did have to reset my computer because I got a check engine light after my first run on ET's. It's the only thing I can think of as the tempature only changed 3 degrees and it started at 81 and finshed at 78. So has anyone else had similar problems?? By the way my friend ran his bone stock(air filter removed)00 Auto LS1,to a best of 13.49 and best mph of 104. I thought that was excellent for him,at least I did manage to have the best ET.

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00 White Lightning
JL (2)Superchip
JL Air Filter
JL Driveshaft Loop
JDM Lower Blower Pulley
2001 90 mm Mass Air
2" Lowering Shackles
Custom built and designed single 3.5 exhaust with Flowmaster Race Muffler

93 Ford Ranger
FI 302 with 185 AFR heads
GT-40 intake w/ported lower
65 mm TB
66 lb injectors controlled by Western Motorsports SDS fuel injection
TDC Stage 2 twin turbos
AOD trans w/Lentch strip valvebody
10 inch convertor and single input shaft
8.8 rearend w/mosier 31 spline axles and 3.08 gears
Chassis Tech Ladder bar suspension
and plenty more !!