Tuning Information and Common Questions

If we have flagged your car for possibly having low fuel pressure, you should take the time to actually check the fuel pressure.  Most people

When you are datalogging, you may notice that the fuel trims are quite different from the driver’s side bank (Bank 1) to the passenger side

Tuning cars can be a real hassle.  There are no set how-to’s, and it’s difficult to know all of the nuances without years of experience.

Early Gen IV GM ECM’s from 2005 till 2008ish have a small injector limit hard coded in at 63.5 lbs. This year range is vague

E40’s cannot use more than 256 kPa of manifold pressure. It is a hard code limit.  Because of this, an E40 cannot use the popular

Injector shopping can be overwhelming. If you are buying a set of injectors for your build, it is absolutely crucial that you buy them from

The internet is flooded at the moment with knock off aftermarket cable throttle bodies made overseas.  These throttle bodies fit poorly, have binding throttle body

P59 ECM Reading & Writing (2003-2006 GM truck) can be a total pain. You may find the estimated read time might be 15 or more

How to Measure Preload and Determine Pushrod Length: Adjust the lifter to the base circle of the cam for the valve you want to measure

Some GM vehicles are “E85 capable” but do not use a flex fuel sensor, or fuel composition sensor. A fuel composition sensor is installed in

If you are swapping to a 4l80 in a vehicle with a factory 4 speed (either 4l60, 4l65, or 4l70) consider our 4l80 swap harness. 

Why buy HP Tuners for mail order tuning? Typically the process for getting a mail order tune is to send us your stock computer, we