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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 10-04-2011, 08:34 AM   #1
oakaro68
 
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Drives: 2011 Camaro SS/RS M6
Join Date: Aug 2010
Location: San Antonio, TX
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Talking HP Tuners scanning after Magnuson S/C install

First off, I'd like to thank Jannetty Racing for giving me a good deal on a Magnuson s/c with their own *free* custom tune. Other companies I called would tell me they won't tune for long tubes or I would have to mail in my ECU (lame) for them to give it their special tune. Jannetty Racing EMAILS you a FREE custom tune and responds quickly to any questions you may have. I've been tuning the car with HP Tuners before, but will leave the forced induction tuning to the pros. I think JRE knows what they're doing

So, this post is a very general observation of a few tables in HP Tuners Scanner while driving to work this morning, mostly for my entertainment.

Outside temp: 48F
Engine temp:190F

The kit relocated my IAT (intake air temp) sensor FROM right behind the air box TO inside of the s/c so it's reading intake temps (more than likely) before it's compressed **could be wrong**. I expected the air temps to be higher than ambient, but that was only the case by MAYBE 1 or 2 degrees. Sometimes it would read ambient temps (same as outside temp). After about 5ish seconds of being in boost (aggressive part throttle) the temps went up from 48 to 61 degrees. Again I'm not sure where the IAT is pulling this reading, but I'd like to find out.

The spark table was reading much lower than normal n/a (naturally aspirated) timing which was what I expected. At low rpm (around 2,000) full throttle, the timing was only 11 - 15 degrees, and up to 6,000 rpm I was only running around 15 - 18 degrees on average. Huge difference from what the n/a tune was. We tuned the LS1 in the Trans Am to run around 30+ degrees, n/a of course. I get it, more cylinder pressure = less timing. This is just a general observation because I enjoy this stuff.

Another thing to note was the Cylinder Airmass measured in g/cyl went from (before s/c install) .82 - .86 g/cyl (rough peak average) to 1.16 g/cyl (rough peak average)! For a quick referrence, adding Kooks long tube headers 1 7/8" primaries gave me about .4 g/cyl more air flow so jumping from .86 to 1.16 is a huge improvement.

Could anyone chime in on where the IAT sensor is pulling it's reading (before or after being compressed)?

First and only time to the track in my Camaro I ran 13.004 @ 111mph, can't wait to see what it does now
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Old 10-04-2011, 09:36 AM   #2
Padre
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Drives: 11 2SS/RS, Black/Inferno, L99 A6
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HP Tuners is fun.

You are 13* above ambient, which is similar to my experience with both the IAT at the MAF and at the filter (I'm NA). Mine is usually about 9* above ambient, which comes from engine bay heat.

But I'm sure Jannetty will chime in on where the IAT sensor is. I don't see why it wouldn't be after compression.

But if you're at 13* above ambient, that's great. You need to test it now for heat soak (staging lanes, back to back passes, all that). That'll be key for consistent racing.

Good luck with your new toy!

Padre
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Old 10-04-2011, 09:56 AM   #3
oakaro68
 
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thanks padre! when i go to the track next i'll take the computer with me to see what's going on
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