Performance Trends, Inc.

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1)  Accu-Force (tm) Shock Dyno Retrofit Kit  One of our customers (Jeff Patterson of Dallas Tx) added one of our Shock Dyno Retrofit Kits to his  Accu-Force ^tm shock dyno.  The blue arrows point out our kit components in the picture below.

Jeff told us:  First I want to say this product is awesome. I am running at 3" of stroke and the Accu-Force ^tm only goes up to 13"per second is the fastest it goes but it does exactly what I need it to. I compared it with a Maxwell ^tm dyno and it's very close. But my RPMs are low. In the 70 range by what the software is telling me. But it's still seems to be measuring the load correctly.

  to email Jeff if you have questions about what he did

  to read more about what Jeff had to say

  for more info on our Shock Dyno and Shock Dyno Retrofit Kit

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2) Land & Sea Retrofit Features  We've fitted about 1500 dynos with our DataMite loggers and software, starting back in 1994.  Many of these include retrofitting dynos like Mustang ^tm, Clayton ^tm, SuperFlow ^tm, DynoJet ^tm, Stuska ^tm, Land and Sea ^tm, and others.  A couple of customers who fitted our Dyno DataMite to their Land and Sea dynos sent in some pictures to share their experience with torque and RPM sensors.

    click load cell images to enlarge

for more pictures and info on retrofitting Land and Sea dynos

for info on our Dyno DataMite Datalogger and Software

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3)  July 4 Holiday  We will be closed Friday, July 3 to celebrate America's Independence Day on Saturday, July 4.  Have a great holiday weekend!

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4)  Featured Product - Spring Wiz  Our Spring Wiz program lets you analyze design details about valve springs.  It will give you some idea about the stresses within the metal, coil bind, natural frequency, spring rate and forces at various lifts and much more.  Then you can add in some valve train weights and cam profile info and it will give you some idea if the spring pack you are designing will keep the valve train under control at various RPMs.

The Analysis Screen shows the analysis of the cam profile combined with the spring data and other valve train specs, including such things as:

• Frequency analysis.   Frequency analysis is done by FFT (fast fourier transformation) and is used to determine the likelihood of spring surge at various RPMs.  
• Required Force and Safety Margin which determines if you have enough spring to control the valve train mass for the rpm range you want to run.
• Pointing out if the stress in the spring is very high.
• Pointing out if the valve's seating velocity is too high.
• And much more.

"Find a Spring"

The powerful and easy "Find a Spring" feature lets you find several combinations of valve spring specs to meet your engine's requirements.  You will enter info about your engine's valve train and camshaft, and enter a few simple inputs as shown below, and then the program will find a valve spring to control this valve train at the RPM you have specified.

The results from "Find a Spring" are shown below, and consist of 20 combinations of Seated Force (installed force) and Spring Rate which will control the valve train.  That means it will keep the valve train in contact with the cam profile at the specified RPM.  The Safety Factor is how much more spring force the program suggests over the bare minimum needed.  For example, if 400 lbs is needed, but you have specified a 20% safety factor, the program will suggest a spring combination which produces 480 lbs at the critical valve lift.  The program also suggests a minimum valve spring natural frequency to avoid valve spring surge.

Once you have these suggestions, now you can go back and build your spring pack which produces the performance you require.

for more info on our Spring Wiz

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5) Last May's Newsletter Here are the topics covered in our previous newsletter.  If you would like another copy of May 2020's newsletter (or any previous newsletter) for detail on these topics, visit our website at: Performance Trends Newsletters 

1. Gen 2 SuperFlow Dyno Control Valve
2. Shock Dyno IR Temp Sensor Flex Bracket
3. Smokey's Smarts
4. Featured Product - Land Speed Software
5. Last April's Newsletter

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