I have a 800 improver 97 mach z. I have FAST pipes, v force reeds, head cut and .060 gasket. I tried a 310/510 spring with 22.5 grams weight and b5 on secondary. Then I tried 250/380 with 19 grams and b6 on secondary and I get good rpm's off the line and then it drops to about 7000 rpm's and barely gets to 8000 at the 1/8 mile mark. Should I lower the tension on the secondary. I am running 9 tooth drivers with 25//44 gearing. I was told to run 23/43 and also 25/43. would it also help to switch to 10 tooth drivers?  Any help would be GREATLY appreciated. Doing more testing this weekend

You are running a very aggressive set up, that is something similiar that I tried on a 1000 Pro stocker. 230/380 spring clicker in 3 or 4, 52/47 helix with 22-24lbs in the secondary, 23/43 gearing and I would use the 10 tooth drivers for better rolling resistance.

Are the 280 ramps too steep. I get good take off then the RPM's drop to 7000 and feels like the motor is pulled down

went to a 250/380 spring, 19 grams, 50/47 helix and went 6.65 in the 1/8. Trying to get a little faster yet  

what ramps?