The racer is one step closer to setting up a tuning plan for density altitude like we wrote about throughout our technical manuals; the racer can log onto www.airdensityonline.com and get current air density and density altitude for many race sites throughout the US; (more…)

Question: Different racers get different boost readings (more…)

In our drag racing, we did use air to fuel ratio as a controlled value to get the engine into a linear range. That task is an extensive explanation through out writings. The linear range is where the engine is completely predictable. We achieved that very well in our racing. (more…)

QUESTION: Do any of your books help in areas of tuning with using O2 sensors? I am needing some what of a baseline for a good tuneup using the correct nozzles, pills to help with getting the most or should I say most consistent in drag race ET’s. Of course everything being the same.

Thanks for replying, R. in Texas

Hi R in Texas,
Thanks for your inquiry. Our Jetting for Racing Mechanical Fuel Injection … book has info on O2 sensors including accuracy limits.

REPEATABILITY VS ACCURACY: O2 sensors are a great tool, however, the accuracy (especially for methanol or ethanol) and repeatability may be issues. Accuracy is less of an issue if they are repeatable. (more…)

Question: What is pure methanol?
Answer: If it is sold as pure methanol, it is supposed to be well over 99% methanol. It is a baseline compound that should behave the same regardless of supplier unless it is mixed with something else such as a top end lube or it is contaminated. (more…)

Congrats to Scott Williamson for great result reported as follows:

“… I raced last weekend at the Jegs Cajun Sports Nationals (more…)

A blown nitro ford combo was reviewed that was run for a year with no breakage, no burned pistons, and no other problems associated with nitro. An extensive analysis tech info may follow if there is interest. Let us know.

Question: Methanol for both IHRA and NHRA Drag Racing
Answer: Both organizations test methanol with different methods. If you have fuel that passes one organization, it may or may not pass the other organization all of the time. I met the fuel check supervisors for both organizations when I was developing 5000 Horsepower on Methanol, and they were both knowledgeable and helpful. Information from both sources is in our methanol book.

Question: Top lube?
Answer: Most racers I have talked to have good success with top lube to inhibit corrosion. Some previous info mentioned some accumulation over time. The reason NHRA and IHRA do not allow it in fuel checks is they cannot distinguish between power enhancing additives (illegal) and top lube in their tests. So you are stuck with the mostly pure stuff for the national and divisional class racing. More info on top lubes in 5000 Horsepower on Methanol.

Question: I turned my blower overdrive up. Why does my boost gage read higher boost for my blower size and overdrive than many of my competitors?
Answer: An increase in boost reading from higher blower speeds over another car with the same blower speed is not necessarily an indication of more air. It may be from more heating, (more…)