Search found 50 matches

by RPM
Fri May 04, 2007 5:46 pm
Forum: Data Logging - Randy McMahon RPM Performance
Topic: Powerglide high gear ratio question.
Replies: 1
Views: 10631

Unless his glide is some new prototype that is no longer a glide, the output shaft cannot turn any faster than the input shaft. Due to the slippage in the converter when under load, the engine will always turn faster than the driveshaft. When decelerating, the driveline will turn faster than the eng...
by RPM
Fri May 04, 2007 5:31 pm
Forum: Data Logging - Randy McMahon RPM Performance
Topic: lm1
Replies: 1
Views: 9945

Fishman, If I understand you correctly, the confusion is that lambda and AFR are two different ways to express the same thing. The air fuel mixture can be expressed as a "lambda" measurement with 1 being the "ideal" mixture. The "AFR #" is the lbs of air, divided by the...
by RPM
Mon Jan 22, 2007 9:13 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: MSD 7531
Replies: 10
Views: 19542

Craig, The input frequency would be about 0 to 700 Hz for a 4 magnet collar at 10,000RPM. If you use the same sensor we use, the input would be 12v rectangular waveform with about 95% hi, 5% low pulses. For the output, you need to know what input range the MSD expects (probably 0 to 5 volts). The de...
by RPM
Sat Jan 20, 2007 9:51 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: MSD 7531
Replies: 10
Views: 19542

A 4 magnet collar at 500 rpm would provide 33 samples per second. If the logger is recording at 100 samples per second (a reasonable minimum for good Drive RPM data) the data would look like stair steps. The problem is due to the conversion method and the sampling of the second conversion. The first...
by RPM
Fri Jan 19, 2007 9:15 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: MSD 7531
Replies: 10
Views: 19542

Craig,

I don't know of one that has the correct input and range to do the Driveshaft RPM. Have you thought about a basic data logger or the Auto Meter 2 channel tach to get engine and driveline RPM?

Randy
by RPM
Thu Jan 18, 2007 9:19 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: MSD 7531
Replies: 10
Views: 19542

Craig,

What you would need is a frequency to voltage converter. This would probably give good results at drive RPM over 1000, but the low RPM readings would not look very good due to the mismatch in sample rates between the converter and the logging in the ignition.

Regards,

Randy
by RPM
Tue Jan 02, 2007 10:56 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: logging A/F ratio
Replies: 15
Views: 31116

Johnny,

Yes, all 8 O2s can be logged with 8 EGTs as well. The WEGO units for alcohol are specially calibrated. The sample rate is usually set at 50 S/S, which is faster than the O2 sensor will normally respond.

If I can help, my number is 405-495-0454

Regards,

Randy
by RPM
Mon Dec 18, 2006 9:23 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: O2 Sensor Reading High
Replies: 4
Views: 11686

O2 Senspr

I know of no way to clean an O2 Sensor. Reading lean is typical of a bad sensor. It could be a problem in the controller, but more likely its the sensor.
by RPM
Tue Sep 05, 2006 9:08 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: Autometer Ultimate II Tach & TachFacts Software
Replies: 2
Views: 10100

Craig,

I checked with Auto Meter, and a replacement CD can be supplied at no charge. Call customer service at 815-895-8141.

Regards,

RPM
by RPM
Wed Jul 19, 2006 8:36 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: logging A/F ratio
Replies: 15
Views: 31116

Todd,

Those are the correct cals. Also you need to go into Data Logger Setup and set the sample rate for the channel to 100 so it will record the channel.

Regards,

Randy
by RPM
Fri Jul 07, 2006 1:11 pm
Forum: Data Logging - Randy McMahon RPM Performance
Topic: logging A/F ratio
Replies: 15
Views: 31116

Todd,

Thats the right company, but that unit has built in logging and display. If you are going to log it in the data logger, you can use the less expensive version, which is the WEGO-INT or the dual channel which is the WEGO-2D.

Regards,

Randy
by RPM
Fri Jul 07, 2006 9:05 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: logging A/F ratio
Replies: 15
Views: 31116

Todd, Most of the aftermarket A/F kits have an analog output that is compatible with data loggers. We have several customers using the Innovate LC1. The Daytona Twintec kit also works well, (Warren Johnson has 8 of them on his prostock car). Daytona has a new "Dual" kit for a sensor in eac...
by RPM
Sat Jul 01, 2006 2:49 pm
Forum: Data Logging - Randy McMahon RPM Performance
Topic: one quick question
Replies: 2
Views: 10074

Todd, The instructions are not as clear as they need to be. The Engine RPM, Drive RPM and G meter settings in the Acquisition section of the setup are the Automatic Launch Detect function. You should set those values to a level that will not be reached until after you leave the starting line. The ot...
by RPM
Mon Jun 12, 2006 9:15 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: driveshaft RPM how to?
Replies: 5
Views: 14656

Todd, The Split Collar is .300" thick, so it probably won't fit between the seal and the step, but from your picture, it would fit in the "saddle" portion of the yoke. You may need to machine the ID of the collar some to get a good fit, but it should work fine. Then you would need to ...
by RPM
Thu May 11, 2006 8:44 am
Forum: Data Logging - Randy McMahon RPM Performance
Topic: Infrared Thermometer
Replies: 6
Views: 14264

Beyond,

The probes you found should work with a data logger, and if you get the one with 10mV/DegC it won't need a thermocouple amplifier.

RPM