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Tuning/CMR/Dyno/DataLogging/Gauges This section is for all discussions related to hand held tuners, CMR tuning, Dyno Tuning, Data Logging & Gauges.

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Old 11-18-2012, 02:14 PM   #1 (permalink)
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help with predator tune

2006 300 SRT8
Mopar Intake
Kooks Long Tube Headers
fulle header-back exhaust (mopar tips, unsure of the exhaust itself)
Predator

So I purchsed my 300 SRT8 with the above listed mods already in the car. It was running the "canned" 93 octane CAI performance tune" when i got it. I've done a little reading here and it seems like the headers and exhaust may require more in depth tuning that just the canned tune has.


I've looked in the "custom tunes" thread and honestly Im not finding it very helpful because it basically is just people taking about their tune, but not the results or data they are seeing.

Last edited by Lunchbox660; 11-28-2012 at 03:24 PM.
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Old 11-18-2012, 03:42 PM   #2 (permalink)
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Each car seems to tune a bit differently so there's no cut and dried tune parameters to suggest. A custom tune, on a dyno by a DSP authorized CMR tuner, is done in phases, balancing quite a few engine parameters including STKR and a whole host of others. The run the car, tweak the program, run it again, tweak it again and eventually settle in to the optimum tune. This procedure is similar to how you do email tunes. You log some WOT, normal driving at different speeds, etc...then send the logs + a copy of your stock tune to someone. They tweak on the tune, send it back to you and you load it. You do more dirivng, logging and send that info back to the tuner. They tweak and send a new tune to you. I initially did some tunes by email with Bob at SVS and we did this process 4 times before we were both happy. Later, with more mods, I went on to a local CMR tuner and had the tune redone.

If you add another 5% but see no change in the STKR at WOT then you've hit the max the injectors can handle. IF it does change, then you are on the right track. To get it lower, and be able to handle more fuel, some SRT4 injectors may be in your future.

One key measurement you can't log unless you are on a dyno or have a wide band sensor in the exhaust stream behind the O2's is Air/Fuel ratio. That measurement is something you should get as you can go too far and see the A/F drop too much at WOT which is too rich.

Frankly, I think it's time to get on a dyno.
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Old 11-18-2012, 07:32 PM   #3 (permalink)
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yea, i have dyno tuned before with numerous cars, im well aware of the process. the problem is i dont know where i can go to do this since i am new in this town and unfamiliar with CMR tuning. i just am looking to make it as safe as possible for the time being until i find a shop and can take the car there, thas all
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Old 11-18-2012, 07:40 PM   #4 (permalink)
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trying to find a CMR tuner on DIablo's website and the results i get are only on the east coast, one in MO, one in CA, and one in Canada.... that cant be right?
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Old 11-18-2012, 08:19 PM   #5 (permalink)
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My point is that you have limited capability to tune or monitor engine parameters while you tune so there's no way to be absolutely sure what's going on at any given moment. Logs are always after the fact. And there's no magic bullet tune that works for everyone every time.

You'll have to call DS to get info on tuners in your area. Their website is not always up to date.
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Old 11-19-2012, 06:03 AM   #6 (permalink)
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Understandable. Thank you. I'll give them a call


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