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 assume that if the vehicle has fuel pressure at an idle it will also have fuel pressure going down the road, but this logic is flawed. A fuel pump too small for the setup, or
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 bank (Bank 2). This is an indication of a mechanical problem. We are unable to control fueling bank to bank, so we cannot purposefully make one side richer or leaner. Some of the causes of
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. There are tuning schools but even still there are so many different GM platforms that require special knowledge to get good results with. You can knock a build out quick, but will you waste the
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 because some continued to have this limit longer than others. We have a way to quickly and effectively scale the tune by a little more than 2. Around 120 lb/hr is about the effective limit
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 LSA/LS9 map sensor which has a scalar of 312.50kPa. E40’s were used in 2005 Corvette 2005 & 2006 V8 Trailblazer, Envoy, GMT360 V8 2005 & 2006 GTO
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 a place that supplies injector data. Without this data, the injectors will be useless to us. This data describes how the injector flows at different pressures, voltages, and time. It must be found in GM
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 blades, and have choked IAC passages. They also have problems returning to idle. They come to different throttle stops which drive idle learning crazy. The IAC passages are usually so choked up that they cannot deliver
P59 Reading & Writing (2003-2006 GM truck) can be a total pain. When you go to read it, you may find that the read time estimate might be 15 or more minutes. When you attempt to write it, it may take 15 minutes…or it may fail all together. To improve your chances of reading or writing, pull the radio and
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 (see below) Using a pushrod that you know the length of (stock is a good starting spot, it is 7.400”), tighten the rocker arm bolt down to zero lash. Do this with your fingers, when
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 the fuel line and can sense how much alcohol is in the fuel. Lots of OEM GM cars came with fuel composition sensors but many did not. If they didn’t come with this sensor but
