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First, thanks to Donald for a great race, SGMP for a great track and ALL the racers, both our customers and others for a great race. The nitrous racers, be they my customers, Steve's, Prock's, Kevin Neal's, whoever, put on a good show and made the nitrous faithful proud.
As for our results with Chad Henderson's car, they were both good and bad. This was our first race with the 738 in the car with the new chassis setup. The car has been fast with the small motor 4.41, but this is a totally new deal, as the 738 had several changes. We also had ZERO testing and actually had pushrods delivered to track, so the motor had not even been run when we got there.
Our first test past, resulted in a pedaling 4.80, after the car did a powerstand and he had to peddle the throttle twice and the car came down pretty hard. We inspected it and found no damage, so we carried on........but...........from that point on, our weekend was crap pretty much. The next pass it struck the tires early, but he did get back in it and it ran clean and we got to look at the tune a little. First QF for RVW was Thur night and the car died when he turned loose of the brake. WTF. Data showed a cam sensor issue, so we looked into that.
Friday morning after some cam sensor diagnostics, the car would not even do a burnout and was pushed off. And so went our Friday. ALL DAY, the car would not run. It was perfect in the pits, but get it on the track and it would die at the release of the brake. We changed EVERYTHING and the problem persisted and I think this went on for 4 or more runs.
So Friday night, we replaced both cam and crank sensors(for second time), as well as ran all new wires to ECU for those two items. Sat morning, with a soft "get it down" tune....... our problem seemed to be resolved with a 4.45 ET which put us in ODR at the number 4 spot. Now seeing as we had wasted the week trying to just get the damn thing to run, we had NO data on making the car go down the sometimes tricky SGMP surface in the heat and the 4.45 was our only bright spot, but we KNOW it will run, as it went the 4.45 with only a 1.17 short time and 2.98 to 330 @ 167 so it was hauling good out the back on 3 fairly small kits and a really soft timing number.
Now..........as to WHAT was the electrical issue, as this car has NEVER given us this kind of problems with the EFI, as I have stated here on numerous times. After a lot of thought, I think it was the wheelstand. The cam/crank sensor harness runs inside the right front frame rail and passes behind the shock. I think when the car slammed down it possibly pinched the wires between the spring on the shock, between shock and frame or something similar. I just ran new wires at the track and the problem was fixed and I can't see up in the frame without taking some of the car apart, which I will do this week.........but at this point, some damage to that wiring seems a logical conclusion. Pretty confident I will find a pinched spot. Obviously it did not cut it in two, or the car would not have run at all............BUT.......if it nearly cut it in two, that would explain why the car would run in the pits, but not on the track under load.......Maybe......lets hope......LOL!!!
Long, exhausting week, but maybe we did learn a LITLLE something........
Monte
As for our results with Chad Henderson's car, they were both good and bad. This was our first race with the 738 in the car with the new chassis setup. The car has been fast with the small motor 4.41, but this is a totally new deal, as the 738 had several changes. We also had ZERO testing and actually had pushrods delivered to track, so the motor had not even been run when we got there.
Our first test past, resulted in a pedaling 4.80, after the car did a powerstand and he had to peddle the throttle twice and the car came down pretty hard. We inspected it and found no damage, so we carried on........but...........from that point on, our weekend was crap pretty much. The next pass it struck the tires early, but he did get back in it and it ran clean and we got to look at the tune a little. First QF for RVW was Thur night and the car died when he turned loose of the brake. WTF. Data showed a cam sensor issue, so we looked into that.
Friday morning after some cam sensor diagnostics, the car would not even do a burnout and was pushed off. And so went our Friday. ALL DAY, the car would not run. It was perfect in the pits, but get it on the track and it would die at the release of the brake. We changed EVERYTHING and the problem persisted and I think this went on for 4 or more runs.
So Friday night, we replaced both cam and crank sensors(for second time), as well as ran all new wires to ECU for those two items. Sat morning, with a soft "get it down" tune....... our problem seemed to be resolved with a 4.45 ET which put us in ODR at the number 4 spot. Now seeing as we had wasted the week trying to just get the damn thing to run, we had NO data on making the car go down the sometimes tricky SGMP surface in the heat and the 4.45 was our only bright spot, but we KNOW it will run, as it went the 4.45 with only a 1.17 short time and 2.98 to 330 @ 167 so it was hauling good out the back on 3 fairly small kits and a really soft timing number.
Now..........as to WHAT was the electrical issue, as this car has NEVER given us this kind of problems with the EFI, as I have stated here on numerous times. After a lot of thought, I think it was the wheelstand. The cam/crank sensor harness runs inside the right front frame rail and passes behind the shock. I think when the car slammed down it possibly pinched the wires between the spring on the shock, between shock and frame or something similar. I just ran new wires at the track and the problem was fixed and I can't see up in the frame without taking some of the car apart, which I will do this week.........but at this point, some damage to that wiring seems a logical conclusion. Pretty confident I will find a pinched spot. Obviously it did not cut it in two, or the car would not have run at all............BUT.......if it nearly cut it in two, that would explain why the car would run in the pits, but not on the track under load.......Maybe......lets hope......LOL!!!
Long, exhausting week, but maybe we did learn a LITLLE something........
Monte
