I had an interesting email exchange with a very knowledgabel and astute racer that I thought I would share. I’m happy to see he noticed the differences:
I noticed an error in the “Superchargers for IHRA” article…
“One way of looking at where all of that power came from is to look at the
displacement of the blower. The 6-71 displaces a little over 400 ci per
revolution (6 x 71 ci).”
(more…)
Received this email from a knowledgeable racer:
Crew of an A-Fuel car (nitro)
Bought all your books. Excellent reading.
However, my calculated AFR number gives unreal value. How can I make this applicable to nitro?
You can download a 6 page index of terms from “5000 Horsepower on Methanol”. You can also download an index of names from this publication as well. Check the shopping page.
ALREADY AN OWNER: These indexes will help to find page numbers for various topics in the manual; such as octane, nitro, temperature, air to fuel ratios, and many others.
CONSIDERING A PURCHASE: These indexes reveal the extent of coverage and the broad range of topics throughout the publiication.
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…)
Dyno results just in from one of our customers on his new twin turbocharged alcohol Big Block: dyno’d 2,500+ HP at 25 psi boost with a turbo setup capable of 50 psi boost. He reports that the most boost that he is currently seeing in the installation is 35 psi, blowing the tires away on the drag racecar.
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…)