blues2k3

Dan,

I know you know that, but not many people might. Sometimes folks might just question tuning skills based upon that single error thus the post...

twohoos

If the ambient conditions shown on the plot are accurate, then according to this site the CF of 1.20 is correct:
http://wahiduddin.net/calc/calc_cf.htm

mxt_77

Good find... but I'm pretty sure that the atmospheric pressure is not accurate on the chart. I think 25.7in-Hg is below "eye-of-the-hurricane" level low-pressures.
Weather Underground says Orlando was seeing a barometric pressure of 29.92in-Hg that day... which makes the correction factor 1.005, not 1.20.

Someone might want to inform Titan that their barometric pressure sensor is hosed.

Silver9k

[QUOTE=mxt_77,Oct 25 2004, 07:27 PM] Good find... but I'm pretty sure that the atmospheric pressure is not accurate on the chart.

S2000_Europe

So summarizing:

- 1.2 Correction factor is wrong should be 1.005 becasue Florida atomospheric pressure

- Spoon Engine is making 250/1.005 = 247WHP not 208 WHP

- Spoon engine is Stock except Spoon Headgasket

turbo_pwr

I think you got this line backwards. If the CF is wrong (should be 1.05 not 1.20) then the car should be making 208whp not 247whp.

mxt_77

Correct.

Nope. The formula would be:
(measured whp) * (real CF) = (corrected whp)

Instead, we have:
(measured whp) * (invalid CF) = ("incorrected" whp)

So, we need to work backwards to find the measured whp, and then we can use the true Correction Factor to determine the appropriate "corrected whp".
(measured whp) * (1.2) = (248whp)
(measured whp) = (248whp) / (1.2) = 206.7 whp <-- Measured wheel hp

Now, we need to re-correct that for atmospheric conditions:
(measured whp) * (real CF) = (corrected whp)
(206.7) * (1.005) = (corrected whp) = 207.7 whp <-- Corrected wheel hp

Hmm... sounds like you are making a bit of an assumption there. I haven't seen anyone post anything conclusive that indicates exactly what parts this engine contains. From what I understand, it is all OEM parts... it's simply balanced and blueprinted. However, since I believe this motor may have been sourced in Japan, OEM could include the JDM headgasket, which provides slightly higher compression.

brogers

What is a realistic environment that would give a CF of 1.2?

mxt_77

Maybe the top of Mount Everest on an unusually warm day.

Elistan

Assuming 29.92 inches Hg air pressure (standard sea level) it'd have to be 309 degrees F in order to produce a correction factor of 1.20.

Category 5 hurrican Andrew in 1992 produce pressures as low as 27.23 inches. (Third lowest ever recorded.) At 77 degrees F, that'd produce a correction factor of 1.087.

To sum up, we will never ever see a correction factor of 1.2.