Several tunes, boost degrades over time?
Hello, I’ have 3 tunes. GMS1, Trifecta and ZZPs Hp tune and all started fresh with high boost of 20psi for GMS1 and 26psi for Trifecta and ZZP. But over time (4-6 months) they degraded down to 15psi boost? When this happed with the Trifecta tune I called them and they said they have seen this happen before this the Auto trans models and sent me a special tune. But it didn’t work. Not sure if the adaptive learning was in place I pulled the fuses for the ECM and TCM and that didn’t work either?
Any idea why this is happening? thank you. |
First I’ve read about this, perhaps contact ZZP and get their input, for their tune. I don’t think Trifecta still supports the HHR SS tune. The boost loss could be a pressure problem, leaking connections in the charge pipe, intercooler check the clamps.
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Are you losing boost with the GMS1 ? Had mine for 10+ years and never lost any. It's always been around 19-20 max.
If it's affecting all 3 tunes, I would think it's something besides the tunes themselves. What,,,I don't know. How many miles on this SS ? Maybe you've got a turbo getting worn. |
Originally Posted by Oldblue
(Post 925462)
First I’ve read about this, perhaps contact ZZP and get their input, for their tune. I don’t think Trifecta still supports the HHR SS tune. The boost loss could be a pressure problem, leaking connections in the charge pipe, intercooler check the clamps.
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Originally Posted by firemangeorge
(Post 925470)
Are you losing boost with the GMS1 ? Had mine for 10+ years and never lost any. It's always been around 19-20 max.
If it's affecting all 3 tunes, I would think it's something besides the tunes themselves. What,,,I don't know. How many miles on this SS ? Maybe you've got a turbo getting worn. |
I have not gone backwards on the tunes. Will load Trifecta and see what happens.
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It's always a mechanical issue 100% of the time.
Don't blame the program, the 'tune' Think of a 'tune' as just a change of 'torque' allowed at any & every operating point of your engine, whatever the 'tuner' wants, he can do, he can change. Losing boost means 1 of 2 conditions of your engine. Condition 1 = you just increased the efficiency of your engine. Example: You replaced your exhaust catback with a 3" system, which means your boost pressure will be less, as you won't need as much 'boost' to reach the 'tunes' 'torque' allowed programmed conditions. Condition 2 = A mechanical issue. Examples: Worn parts, engine, turbo, sensors, or a leak somewhere in the pressurized turbo system caused by worn parts, failure of parts, or a loosing of parts, (leaks). If your program, whether it's stock or changed, allows you to see 'X' amount of boost, & it's decreasing over time, you have a mechanical issue as the program hasn't changed. "Learn Down" is really a misunderstood concept. It is just your program trying it's best to give you whatever 'torque' values that it has been programmed to give you, at any & all programmed conditions. If something changed, good or bad, the program will 'learn' quickly, to give you the 'torque' values that are called for in your 'tune'. Example: You just installed a better turbo on your engine without changing your program. Your added power boosting turbo will overwhelm your program, & your program will do its best to 'Learn Down' to the allowed programmed 'torque' setting in your program. A neat 'trick' at the dragstrip is to reset your ECM just before every run. Try it, you'll like it. LOL "Learn Up" = when you put a 'tune' in your ECM, as a 'tune' is always causing a increase the 'torque' values allowed, somewhere in your program. LOL A good 'tune' is always the best thing you can do to your 'buggey' whether it's totally stock or modified. |
Sounds to me like it is adapting to a gentle driver.
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Sounds like a leak. Bypass valve, vacuum tank, etc
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Originally Posted by donbrew
(Post 925576)
Sounds to me like it is adapting to a gentle driver.
Our ECM is a 100% 'torque' based unit. Now the automatics TCM 'adapts' to the slow wearing of the clutches & bands over time.
Originally Posted by Pretzel
(Post 925460)
When this happed with the Trifecta tune I called them and they said they have seen this happen before this the Auto trans models and sent me a special tune.
The ECM & the TCM have separate jobs to preform, & don't 'talk' to each other. LOL |
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