Archives: Reader Correspondence

This section features correspondence between readers and Bob. We hope that others in a similar position will be helped by reading these entries.

CHANGING BLOWER OVERDRIVE DOWN FROM 50 OVER

Question: Effect of lowering blower overdrive?? More or less power? Bob?s answer: A trend now is gearing the blower to the racetrack. That is done with rear end gearing, tire size, shift point, and blower overdrive. Adjustment of any of those will change the speed attained by the blower at the end of the drag […]

FUEL INJECTION & TORQUE CONVERTER

Question: Fuel injection adjustment with launch controls for a torque converter racecar Answer: When a mechanical fuel injection throttle is part open, such as in preparation for launching from the starting line using throttle control setups, the air to fuel ratio is dependent on that throttle position at the time just before the launch.

METHANOL, BLOWER, & REAL HIGH COMPRESSION

Question: Can we put an 8-71 blower on a high output, normally aspirated Big Block V-8 with very high compression ratio (15 to 1)? Answer: The detonation can be controlled with enrichment and air to fuel ratio control, theoretically regardless of the compression ratio. However, I am not sure about the mechanical strength of the […]

MORE ON BRACKET RACING TUNE-UP FOR FUEL INJECTION

Question: How did you dial in your mechanical fuel injection setup for bracket racing? Answer: Our tune-up is set up to be in a linear range. That is when we increase the shift point, our ET is proportionately lower. When we lower our shift point, our ET is proportionately higher. That is a result of […]

Customer Math from Fuel Injection Racing Secrets Book

In addition to the math in the FI book, a lot of text and editorial are provided about fuel injection. However, the correspondence that follows is from a ‘Fuel Injection Book’ customer. It is a demonstration of the extent that a tuner can get into from the FI book math section.

Fuel Injection / Air Filters on the street

Below is an email correspondence I had with Jimmy: Hi Bob, I talked to you last week through email about doing a MFI Enderle Birdcatcher on gas on the street … I will use your book to set up and tune my system. But i have a question that may not be covered in your […]