Higher RPM after mods?
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New User
Joined: Mar 2004
Posts: 19
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From: Pearland, Texas
Higher RPM after mods?
I am using the SCMT and have installed a 4" exhaust system with a Mac intake. I noticed after the mods that at 70mph I am running about 300-400 more rpms. Is this normal? The 2000X sure seems to breathe easier but will the higher rpm's cost me gas milage? Also the EGT's after the turbo seem to be at 480-500 at the same speed, is this about right? Thanks for the responses.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,246
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From: Houston, Texas
The higher RPMs will indeed cost you on mileage. If you go too much over 1900 or 2000 rpms, for example 2200 or even 2100 you won't be getting great mileage. From what I gather, your RPMs should be the same, just with a little more power at whatever range. I'm not sure about the EGTs seeing as I myself don't have gauges, but if anything, they should be lower.
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
Not normal, your tach should be reading the same rpms as it did before the mods. Is it shifting normally? Does the torque converter feel like it is locking up? You should see a drop in rpms when it does. Could be a glitch in the programmer that is affecting the transmission shifts.
Posting Guru
Joined: Feb 2004
Posts: 2,248
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From: Elverson, PA
The SCMT does change tranny shifting a little bit but I don't think that the rpm's should be any different. Did you try returning it to stock and seeing if the rpm's go back to normal?? If so then it sounds like a programmer glitch. I had a SCMT for a while and saw no difference in rpm's either way - higher or lower.
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New User
Joined: Mar 2004
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From: Pearland, Texas
still searching
I tried returning the program to stock last night and still no difference. I read the dtc code and found (p0603 Internal Ctrl Mod KAM error) whatever that is. So I cleared it with the SCMT and still no change. When I got home I read the dtc codes again and p0603 was there again. Does anyone know what this is? I really think I must have some sort of trans. or torque converter problem because I am noticing a kick in the rear when shifting at low speed in the first two gears. I really don't know. Again the truck seems to run fine except now all of the sudden I am running about 2300 rpm at 70 mph when I used to run 2100 at the same speed. Still need help. Thanks in advance!!!
