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Tractor Pulling Discussion Forum

Horsepower

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Steve M

06-04-2006 17:29:30




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Another greenhorn question. I see a temperature tester advertized as "better than a dyno". Anyone use one ? Is it a true statement ? What's the theory behind it ?




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temp

06-04-2006 20:39:08




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 Re: Horsepower in reply to Steve M, 06-04-2006 17:29:30  
i am guessing its an exhaust temperature guage...and the richer you have your tractor the cooler the temp and leaner the hotter your temp. it has to do with your air/fuel ratio. in my opinion nothing is better then a dyno.



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TurboS10

06-05-2006 18:54:59




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 Re: Horsepower in reply to temp, 06-04-2006 20:39:08  
Leaded Fuel will foul the oxygen sensor in short order. I may be crazy for saying this, but I would think if it is just for pulling unleaded would be fine and the O2 would work. The thing with O2 is you need a wide band to do any good. I dont care what anyone says, cause I been there, a standard narrow band sensor is COMPLETELY worthless for tuning. A WBO2 will require a controller to run the nearnst cell and heater in the sensor and will cost you about $500 for the complete setup with sensor and controller.

If you dont do that, a pyrometer is a good indicator as well. 1350-1400dF is a good starting point for max power. While this is right at the melting point for aluminum, for short burst you will be just fine here. If you are nervous with that number, stick to 1300. Remember, peak flame kernal temps can reach 4000dF +, and aluminum does not melt instantly...so you have a little lead time for the short time the engine is loaded at the end of the pull.

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superih

06-05-2006 06:46:57




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 Re: Horsepower in reply to temp, 06-04-2006 20:39:08  
Why not just use an O2 sensor instead of a temp sensor?



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G/MAN

06-06-2006 07:35:57




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 Re: Horsepower in reply to superih, 06-05-2006 06:46:57  
O2 sensors are used to measure the air/fuel ratio, which isn't necessarily an indicator of peak power. The air-fuel ratio at which an engine will produce max power can vary greatly depending on a number of factors. And as was mentioned, a common O2 sensor such as is used on cars and trucks is really no good for tuning, as the range of ratios they can measure is very narrow. You must have a wide-band sensor to do any good, and they're considerably more expensive than an OEM automotive sensor.

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Drew

06-05-2006 10:25:30




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 Re: Horsepower in reply to superih, 06-05-2006 06:46:57  
The leaded fuel that a majority of pullers use is not compatible with oxygen sensors.



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superih

06-05-2006 14:29:45




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 Re: Horsepower in reply to Drew, 06-05-2006 10:25:30  
Does the leaded fuel make the O2 sensor read inaccuratly or does the lead damage the sensor?



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D boll

06-05-2006 12:20:19




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 Re: Horsepower in reply to Drew, 06-05-2006 10:25:30  
you can check individual ports on the ex. manifold to find poor firing cyls.



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