AZtrophy
Member
- Thread starter
- #1
Hey everyone. I'm new to the S550 platform/the forum and was hoping to get some of the experts here to help focus my debug efforts.
In my case there are a few things going on:
[Background Info]
I recently purchased a 2015 GT with a stage 2 Procharger (P1SC) setup. I also have a Charger Hellcat (PD supercharger vs centri) so I'm used to entirely different driving characteristics.
The car seems to have been a relatively early S550 build (Procharged in June 2015) then sold to the guy I bought it from who only put ~2k miles on it over the next 3 years.
I've been reading as much as I can on the forums and it seems that the early tunes had some bucking issues, but that was also fixed around the same time* the build was performed. *(June 1st per the referenced thread).
Supercharger Config (P1SC Stg2)
In my case there are a few things going on:
- On cold start, the car idles @ 750rpm but after ~20 seconds it dips down to ~500 and rises up to 1k+ before settling at 750 again. It may repeat the cycle at varying times thereafter.
- When warm, the idle still varies quite a bit with vacuum bouncing between -17inHg to -20+inHg & AFR between 13.x to as high as an instantaneous ~16.x, based on the gauge cluster readout.
- Under moderate throttle the car will begin to build boost and without modulating the throttle, will bounce back to somewhere around 3psi, never really seeming to rise above 6psi (again, at partial throttle). As you can imagine, the car bucks a ridiculous amount during this process.
- WOT seems to perform as expected though I just got the car so testing hasn't been exhaustive.
- MAF located in FMIC
- Tuning related (ie. early tuning issues per the referenced thread)
- Vacuum/boost leak (I suspect that the variations in vacuum and AFR are more likely a symptom of the issue rather than the cause, but what do I know?)
- A combination of these
- Something else entirely?
[Background Info]
I recently purchased a 2015 GT with a stage 2 Procharger (P1SC) setup. I also have a Charger Hellcat (PD supercharger vs centri) so I'm used to entirely different driving characteristics.
The car seems to have been a relatively early S550 build (Procharged in June 2015) then sold to the guy I bought it from who only put ~2k miles on it over the next 3 years.
I've been reading as much as I can on the forums and it seems that the early tunes had some bucking issues, but that was also fixed around the same time* the build was performed. *(June 1st per the referenced thread).
Supercharger Config (P1SC Stg2)
- FMIC MAF location
- 4.13 pulley
- Tial BOV (Q 50mm)
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