Excellent, thanks for sharing. One more question, how do those numbers compare to what the performance pages reported on any of those runs? FYI, your numbers are very close to mine when I've used just a little bit of power braking.
11.4s you say. Mom driven with baby seat in the back...lolSame conditions, I’d wager I could have knocked full tenth or more off that ET.
11.4’s with this truck will be the norm. Just didn’t have the time.
I drove an hour to track, went thru tech and within 15 minutes of arriving, ran that [email protected]
This truck is remarkably consistent and doesn’t seem to suffer heat soak, at least in these conditions.
Yes.........DA (Density Altitude) has a lot to do with it.I am in Tucson and ran consistent 12.2's @ 113 mph at 68 F. I didn't have RH or barometric pressure, but the dragstrip track is at 3000 ft.
It seems everyone else is running mid 11's! Could it be temperature and altitude make that much of a difference?
So that means the equivalent air density would be greater than the standard altitude by 1443 feet, which translates to about 2.25 psi, or 4.5 in-Hg increase.The DA with my slips above was -1443.
So that means the equivalent air density would be greater than the standard altitude by 1443 feet, which translates to about 2.25 psi, or 4.5 in-Hg increase.
This makes sense to me. Using the calculator link below, that should increase the air density by 15%, which would add about 80 HP to the rated power, which should give you 119 mph in the quarter.
I feel better about my 12.2 sec in the quarter now.
Firstly, awesome web page calculator. Thanks. I wondered what the difference would be between a non- and supercharged engine effect. On reflection I think the impact of barometric pressure change on a SC engine maybe due to it being a smaller percentage of SC manifold total pressure than a non-aspirated engine (e.g. 1 psi change to 14.7 psia > 14.7+ 8 psia thus larger impact).I wouldn’t put to much faith in those calculations.
You can correct any run, with either a negative DA or a positive one, to a 0 DA level. It’s called a corrected run, much like a sae corrected dyno run, and it let’s you compare two runs apples to apples. It’s a correction factor that is widely accepted. I believe even the NHRA uses this correction.
Just to be clear, even with the negative 1440 run above, the correct run to 0 DA is only about a tenth and 1-2 mph slower for a Supercharged engine.
DA Calculator - Density Altitude Calculator - DragTimes.com