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What Is Too Lean for S/C?

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Old Oct 7, 2010 | 07:32 PM
  #11  
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Originally Posted by Moddiction,Oct 7 2010, 03:14 PM
I see mid to high 12's with my vortech at redline. Would like it to be a bit richer but I'm not TOO worried with it as long as it doesn't get any leaner.
Mid to high 12s seem kind of high no?
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Old Oct 7, 2010 | 07:40 PM
  #12  
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I think it is a bit lean but i don't think it is at a dangerous level yet. Especially at only 7 lbs of boost but I could be wrong.
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Old Oct 7, 2010 | 07:46 PM
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Originally Posted by JawKnee,Oct 7 2010, 11:32 PM
Mid to high 12s seem kind of high no?
thats too lean for me. id richen it up personally
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Old Oct 7, 2010 | 07:47 PM
  #14  
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Thanks for the input everyone.

I have a plan and we shall see what my weak base SC puts down
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Old Oct 7, 2010 | 08:12 PM
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Mid to high 12's is perfectly fine with these types of superchargers, so 12.2 to 12.3 is fine IMO...
I ran my comptech non aftercooled kit when I had it at 8.7 pounds of boost and I was runnning high 12's in vtec.. I ran that way for 2 years daily driven and thousands of miles with zero problems.

I now currently run 18 pounds of boost on the same bottom end (Been boosted for close to 30K now) but with my Inline Pro turbo kit and I see AFR's in the 11.6 to 12.1 range normally.
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Old Oct 7, 2010 | 08:14 PM
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^Sweet. Thats good to hear! Mine was all messed up and actually ran mid 15's for a little while. Was very dumb but engine never had an issue somehow haha. Some engines these cars have!!
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Old Oct 7, 2010 | 08:27 PM
  #17  
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Originally Posted by TRBOKEV,Oct 7 2010, 08:12 PM
Mid to high 12's is perfectly fine with these types of superchargers, so 12.2 to 12.3 is fine IMO...
I ran my comptech non aftercooled kit when I had it at 8.7 pounds of boost and I was runnning high 12's in vtec.. I ran that way for 2 years daily driven and thousands of miles with zero problems.

I now currently run 18 pounds of boost on the same bottom end (Been boosted for close to 30K now) but with my Inline Pro turbo kit and I see AFR's in the 11.6 to 12.1 range normally.
I concur.

Your great where you are Johnny, but if you want to experiment leaning out a bit to see if you make more power, I would feel comfortable doing this as long as your above vtec afr is steady bellow 13's. Lower 12's is optimum and gives you a little leeway on the colder days. Unless you want to fiddle with your tune on the street depending on the seasonal temps, your going to have to find a happy medium, which my suggestion would be low/mid 12's on a 50-60 degree day like current. Ignore the afr spikes around vtec (unless they are touching mid 13's, which may trigger some slight detonation) If you take it out on a cold winter day in the 30-40's you will be in the upper 12's ...and on a hot summer day you will be mid 11's, this is my best estimation from my experience with a target in the low 12's about this time of year. From the coldest to the warmest months, you will fluctuate about a full point.
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Old Oct 9, 2010 | 01:45 PM
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Johnny post up your dyno and specifics.
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Old Oct 9, 2010 | 09:50 PM
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Results
WHP: 315 uncorrected / 313 STD
WTQ: 207 uncorrected / 205 STD
* 68.5 degrees, 45% humidity

I had baselined there 4 months ago and the temp was 66.92, and 57% humidity and only difference besides the SC, was 10W-40 oil now instead of 0W-30 oil and 1 range colder plugs and the delta was ~92 whp and ~48 wtq.

MY2005
Supercharger Kit: SOS Base/Stage 1 6 psi with AC
Supercharger: Paxton Novi 1220 oil-fed
Motor: F22c
Compression: 11:1 (Stock)
EMS: SOS FVM (piggyback)
Fuel: Chevron 92 octane with up to 10% ethanol
PSI: 5.89 according to dyno for this run
WHP: 315 uncorrected / 313 STD
WTQ: 207 uncorrected / 205 STD
Dyno: Dynojet 424xLC2
Additional Specs: ProFlow 64.25mm/70.1mm throttle body, Berk Technology 63.5mm test pipe, HKS Hi-Power 60mm dual exhuast, SOS sport clutch kit with AP1 flywheel, AMSOIL 10W-40, NGK Iridium IX Spark Plug BKR8EIX #2668, 18x9.5 BBS LMs with 255/35-18 Bridgestone RE-01Rs

I assume that's probably average/typical?
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Old Oct 9, 2010 | 09:56 PM
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Did you play around with your afr at all? If so what kind of gains did you see and what ratio did you end up with?
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