Updated dyno numbers
03-23-2005, 08:16 AM
#13
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Thanks guys, can't wait to get back to the track now. Plus I really feel like with a little more tuning that there is a little more to be had out of this cam. I know I need to adjust the shift points a little and just various items here and there. But overall I am impressed. The truck pulls like a beast from a slow roll to like 85-90. I lost a little low end, but nothing major. I would definitely not want any less of a stall though.
I am having one issue that maybe someone can chime in with though. When the truck is cold, in park and neutral it idles low, not dieing low but it has a nice lope to it, once you put it in a drive gear it idles higher. This is not a problem. But once I drive the truck for a while and get it warmed up and then put it into park or neutral, it wants to sputter, cough, and die on me. I have to keep the gas in it to keep it alive. In the same sequence I can go from park with it almost dead, just barely idling, and shift to any of the drive gears and it perks right up and never misses a beat. Now mind you, it has not thrown any codes whatsoever. I am sure it has to be a tuning issue, but I am not sure what. Too low idle, or maybe false knock? I would think a false knock would throw a code though. Anyways, I am going to be going back after work today and have them look at my tuning to see what the issue is.
I am having one issue that maybe someone can chime in with though. When the truck is cold, in park and neutral it idles low, not dieing low but it has a nice lope to it, once you put it in a drive gear it idles higher. This is not a problem. But once I drive the truck for a while and get it warmed up and then put it into park or neutral, it wants to sputter, cough, and die on me. I have to keep the gas in it to keep it alive. In the same sequence I can go from park with it almost dead, just barely idling, and shift to any of the drive gears and it perks right up and never misses a beat. Now mind you, it has not thrown any codes whatsoever. I am sure it has to be a tuning issue, but I am not sure what. Too low idle, or maybe false knock? I would think a false knock would throw a code though. Anyways, I am going to be going back after work today and have them look at my tuning to see what the issue is.
03-23-2005, 09:29 AM
#14
Its definitely a tuning issue. There are several tables that need to be adjusted for electric throttle trucks. They each control a different function, but work together. Idle airflow in park and in gear, running airflow, idle speed, IAC, etc... The electric TB trucks don't have IAC, but the PCM calculated IAC functions into degrees to open the throttle blade for idle. Typically colder temps have a higher idle and more airflow in the tune. Once hot, those numbers are reduced. Thats why you have the issue.
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