With a small increase from 6% to 9% nitro, in preparation we dropped the AFR to from 3.7 to 3.4. As a result, we picked up a tenth of a second and about 4 MPH over 6% nitro. (more…)

We added port nozzles and put about 60% of the fuel into the ports.
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We tested a low percentage of nitro last week in our blown alcohol drag race roadster. (more…)

Just a note about our test engine for this year. We put our blown alcohol engine back together for nitro testing this year.
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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).”
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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?

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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…)