Any n/a guys w/gauges?
#26
Rotorhead
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Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
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The previous generation dual gauge manual states accuracy as follows:
Pressure +/-1psi over a 1-200psi range
Temperature +/-1degC at 25degC
Voltage +/-0.1v between 9-16v
http://www.spatechnique.com/
Gauge readings are great for tuning but you want warning lights or buzzers for actual driving. I would not consider any aftermarket gauge set that does not have some type of user-defined warning. Fortunately, more and more brands are offering this function on their electrical gauges. I see that even Auto Meter now has shift-mad-quick-yo Nexus ricer gauges that are programmable.
Too bad most EGT gauges are too slow to respond causing you to tune the wrong RPM ranges. Not to mention alot of people cut and splice the EGT probes wiring which moves the "cold juction" point to a place the gauge isn't expecting it making it useless. A wideband would be a better choice to tune the A/F ratio don't you think? Fast acting EGT probes are useful in tuning ignition timing when you can log them against RPMS so you know and can see what you're doing. I had an EGT gauge once a long time ago. I found it useless. A "good" one too, I had a Greedy.
http://www.exhaustgas.com/ProductDet...sketID=&RepID=
For those of you considering an EGT gauge, make sure you get one that reads at least 1700degF.
A 'wideband' refers to a fancy air-fuel ratio (AFR) gauge. A wideband sensor is fairly accurate between the air-fuel ratios of 10:1 and 20:1 (car engines usually operate in the 12:1 to 16:1 range). A narrowband sensor is only accurate at the stoich air-fuel ratio (about 14.7:1) and accuracy decreases above and below this value.
#28
Banned. I got OWNED!!!
Aircraft turbine engines are adjusted by EGT rather than AFR, so it is possible to get good response times from EGT. The type of EGT probe makes a lot of difference in response time. A good K-type thermocouple has a response time of about 300-750 milliseconds. A thermocouple with a thick sheath can have a response time as slow as 4-7 seconds. If you still have your Greddy gauge, see if one of these better probes will fit:
http://www.exhaustgas.com/ProductDet...sketID=&RepID=
http://www.exhaustgas.com/ProductDet...sketID=&RepID=
Now I'm running a k-type thermocoupler with a Motec Termocoupler Amp wired strait to the M820 so I can log EGT's. It keeps throwing an error though so sadly I need to get a second probe and see if that rectifies the problem or not so I'll definately be buying from them as opposed to the first pace. Thanks for the link.
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