Well, I have good news and I have bad news about the 63 mm throttle body.
The good news, I was able to run consistently faster with the 63mm TB, on average about .110 quicker. The bad news is, I had to manually shift at about 6,000 RPM as opposed to the automatic shift at 5,800 RPM. I made 5 to 6 runs with each of the following configurations. The times are the best ET's with each configuration.
60 mm TB automatic shifting@5800 RPM 16.262
63 mm TB automatic shifting@5800 RPM 16.283
60 mm TB manually shifting@6000 RPM 16.312
63 mm TB manually shifting@6000 RPM 16.138
This would suggest, it's making more HP, but's it's moving the powerband slightly higher. So in order to really take advantage of the extra power, you'll need to either buy a chip to change shift points, or manually shift. By the way, the manual shift was only 1-2, the 2-3 shift was automatic for all configurations.
The good news, I was able to run consistently faster with the 63mm TB, on average about .110 quicker. The bad news is, I had to manually shift at about 6,000 RPM as opposed to the automatic shift at 5,800 RPM. I made 5 to 6 runs with each of the following configurations. The times are the best ET's with each configuration.
60 mm TB automatic shifting@5800 RPM 16.262
63 mm TB automatic shifting@5800 RPM 16.283
60 mm TB manually shifting@6000 RPM 16.312
63 mm TB manually shifting@6000 RPM 16.138
This would suggest, it's making more HP, but's it's moving the powerband slightly higher. So in order to really take advantage of the extra power, you'll need to either buy a chip to change shift points, or manually shift. By the way, the manual shift was only 1-2, the 2-3 shift was automatic for all configurations.
