FAQ's
Why can't i pass the emissions readiness test?
There are two main reasons. If you have an older tune your readiness test has been disabled. This was done because prior to 2008 the inpsection tests looked for and engine light only. If you have a recent tune then there are some tests that have been disabled. With our custom tunes you'll pass the test, guaranteed!
How does SAE correction work?
SAE correction factor takes the raw dyno readout and corrects it for 29.32 inches of Absolute barometer, 77 degrees and 0% humidity. That means if it's 90 degrees out and it's humid with low pressure (stormy) you'll show lower raw numbers. The SAE correction will enhance the number based on the SAE condition. If it's 40 degrees at the dyno then the SAE correction will deduct from that number. There are a few exceptions, though. Supercharged motors depend a little bit on the atomospheric conditions to make peak boost. It it's warmer and humid you'll literally make less boost than on cold sunny days. That will greatly affect the dyno numbers and SAE will not be able to correct for that.
How come some dynos read higher than others?
There are a couple of factors. Many shops haven't been properly trained and just don't know how to properly strap down the vehicle. Also the placement of the dyno electronics is critical. If the "stack" is too far away or in a seperate closet then the atomospheric condtions won't be accurate. One thing to check is the absolute barometer reading on your sheet. Here is a good baseline of what the reading should be based on the shop's altitude: http://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html. As you can see, if the altitude at the shop is near sea level and the absolute barometer on your sheet should read about 29.92 or higher. It it reads 28.6 in.hg then the corrections factors will be wrong, more than likely raising your raw number incorrectly.
What's the max RWHP my engine can handle?
Cobra Internals RWHP Rating
88-95 5.0L 500
96-04 4.6L 450
96-01 4.6L Cobra 400
|03-04 Cobra 750+
05+ GT 450
GT500 650
Lightning 400
LSx GM 550
Here's some general guidlines for driving. If you race heavily and are a very agressive driver who routinely breaks the speed limit by 50-100mph+ then the numbers may be lower: Now I've seen 99 GT's survive on 500 rwhp and low 600 rwhp GT500 lose connecting rods. When you nearly double the rear wheel power of a motor than you don't have the safety factor anymore. That means bad fuel may do you in.