Drag Racing Discussions > Front Engine Dragsters

Wide Band O2 tuning for an FED

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dreracecar:
All those classes run gas, not alcohol
YouTube the video of a nitro fuel pump demonstration, alc is the same, just less volume

masracingtd1167:

--- Quote from: oldmanreo on January 09, 2016, 06:08:09 PM ---all pro stock team and many comp. racers use o2 to tune their engines
include pro mod also .if i had the money i would use o2.as for alh. being a liquid
in the cyl.chamber i belive tht it would hydraulic the engine

--- End quote ---
     When you run alcohol you have to be carefull that you don't close your intake valve too early . With all of the extra liquid in the cylinder it can raise your dynamic compression too high and cause engine damage . As far as the o2 goes the cost to monitor 02 for each cylinder would be through the roof ! The best method I have found for tuning is to monitor engine temp . If it won't build heat during a run it is too rich . If it builds too much heat it is too lean . Pretty simple but it works . Bill

JrFuel Hayden:
I have talked to at least 3 teams racing alky that have tried, with no sucess, or help with O2 sensores .
 They seem to help with gas, but not alky. 
 Still the best is reading spark plugs, and ET slips.
Yes, engine temps help, but you can build real good temp by leaning the barrel valve, but to check temp build up, check the engine temp with a temp gun after the run.
 I try to get my engine temp to 180° to 200° while staging the car, [ with water in the block/ heads, 160° dry]  alky burns better with a hot engine.
I know some bracket racers that change their engine temp to run the number, cooler to slow down, hotter to run quicker.

Jon Hansen, JrFuel Dragster Association

slingshot383:
You can do O2 with collector header and alcohol, but zoomies don't have enough length.  While temp probes are typically 2" from the head, O2 sensors are usually 8" or more from the head.

wideopen231:
what is this collector you speak of sligshot? Is it like one of those carb things? Urban legend.

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