To start this off I made two changes to the car before this happened. The first change was the purchase of 2 new Mickey Thompson 255/60R15 ET Street drag radials for the rear. Thanks to my friend Pat (SloGN) for lending me a pair of 15X8 rims for the tires so I don’t have to drive with them all the time.
The second change was draining all the 93 octane gas out of the GN that I could get into the Scirocco. I believe I had around 4 gallons of 93 left in the GN. I then added 9 gallons of 110 race gas to the tank.
Before going to the track a turned the boost up a tad, raised the timing up about 1 degree and leaned out the fuel about 2 tenths. The whole idea was the race gas was going to help me do all those without any knock.
Run 1 with the above combo and settings my ET was 8.05 and MPH was about 87 and my 60’ was a 1.8. After the run I checked the Powerlogger and I definitely had some knock. Boost peeked at around 25 psi.
I brought the boost down a tad and lowered the timing about .5
Run 2 with new lowered boost and timing my ET was 8.02 and MPH was about the same (87), my 60’ was still in the 1.8 range. I reviewed the powerlogger again and I was still getting knock, but not was bad as the first run. My boost was at around 24 psi.
Again I brought the boost down a tad and lowered the timing .5
Run 3 was my best ET 7.88 and MPH was still 87. What happened was the knock went down some more and my 60’ was a 1.69. I’d finally figured out what it’s going to take to 60 foot my car (although I’m still learning). I was still getting knock, but if I remember correctly it was about 1 degree.
This time I left the timing alone and dropped the boost a hair.
NOTE: This is where I found my problem!!!! While waiting to bikes and a 7.49 class to run, I was standing looking at the engine and noticed one of the plug wires on the coil was sitting up a bit higher than the others. I reach over and push down on it and feel the familiar CLICK. Lord knows how long I’ve been running my car with one of the cylinders at about half power (I figure that it was arcing and still firing the plug, but not a full strength). The last time those wires were messed with was when we put the new heads in, so I suspect my Dyno tuning was even off.
Run 4 was probably my best run, however I red lighted and didn’t get a time (F#!$%ing track). I was lined up against a nice IC T-Type and I was building as much boost as I could. The brakes weren’t holding and the car started inching forward, by the time I got the green I broke out of the beams. I got the jump on the T-Type and my back bumper was on his front bumper. By the time we shutdown my front bumper was at his door, so he ran me down for sure. The slip I received didn’t show anything about my times, but his time was 7.3 at 93 MPH. This run I had zero Knock!
Run 5 was my worst time. I may have raised the boost a hair, but left everything else alone. Two cars up from me a Mustang had finished burning out and was in the process of staging when they shut him down. He was pouring fluid out onto the staging lane. They pushed the car out and mopped up the fluid, but I’m positive they didn’t get everything up. I spun at the line and ran 8.1 at 87 MPH.
That was all the runs I got in. I suspect that I can now start building on this base tune and get the car to 60’ and MPH better now that the plug wire issue was found.
That’s it in a nutshell
The second change was draining all the 93 octane gas out of the GN that I could get into the Scirocco. I believe I had around 4 gallons of 93 left in the GN. I then added 9 gallons of 110 race gas to the tank.
Before going to the track a turned the boost up a tad, raised the timing up about 1 degree and leaned out the fuel about 2 tenths. The whole idea was the race gas was going to help me do all those without any knock.
Run 1 with the above combo and settings my ET was 8.05 and MPH was about 87 and my 60’ was a 1.8. After the run I checked the Powerlogger and I definitely had some knock. Boost peeked at around 25 psi.
I brought the boost down a tad and lowered the timing about .5
Run 2 with new lowered boost and timing my ET was 8.02 and MPH was about the same (87), my 60’ was still in the 1.8 range. I reviewed the powerlogger again and I was still getting knock, but not was bad as the first run. My boost was at around 24 psi.
Again I brought the boost down a tad and lowered the timing .5
Run 3 was my best ET 7.88 and MPH was still 87. What happened was the knock went down some more and my 60’ was a 1.69. I’d finally figured out what it’s going to take to 60 foot my car (although I’m still learning). I was still getting knock, but if I remember correctly it was about 1 degree.
This time I left the timing alone and dropped the boost a hair.
NOTE: This is where I found my problem!!!! While waiting to bikes and a 7.49 class to run, I was standing looking at the engine and noticed one of the plug wires on the coil was sitting up a bit higher than the others. I reach over and push down on it and feel the familiar CLICK. Lord knows how long I’ve been running my car with one of the cylinders at about half power (I figure that it was arcing and still firing the plug, but not a full strength). The last time those wires were messed with was when we put the new heads in, so I suspect my Dyno tuning was even off.
Run 4 was probably my best run, however I red lighted and didn’t get a time (F#!$%ing track). I was lined up against a nice IC T-Type and I was building as much boost as I could. The brakes weren’t holding and the car started inching forward, by the time I got the green I broke out of the beams. I got the jump on the T-Type and my back bumper was on his front bumper. By the time we shutdown my front bumper was at his door, so he ran me down for sure. The slip I received didn’t show anything about my times, but his time was 7.3 at 93 MPH. This run I had zero Knock!
Run 5 was my worst time. I may have raised the boost a hair, but left everything else alone. Two cars up from me a Mustang had finished burning out and was in the process of staging when they shut him down. He was pouring fluid out onto the staging lane. They pushed the car out and mopped up the fluid, but I’m positive they didn’t get everything up. I spun at the line and ran 8.1 at 87 MPH.
That was all the runs I got in. I suspect that I can now start building on this base tune and get the car to 60’ and MPH better now that the plug wire issue was found.
That’s it in a nutshell
