ArtieParty

iTrader: (1)

I've been trying to google the difference in the 2 and can't really seem to find any formula's or anything except people on forums talking about it which one is accepted.

Can someone shed some light on the subject and tell us exactly what goes into each?

Reason I ask is because I noticed something in the dynojet files that we use in Newark, DE and was wondering if that made a difference in the numbers or not.

hustler

iTrader: (6)

In for answer.

therieldeal

iTrader: (2)

SAE correction "corrects" your dyno numbers to standardized temp, atmospheric pressure, etc in an attempt to make dyno runs from one day comparable to dyno runs on a different day with totally different weather conditions.

it actually works pretty well... for n/a cars. for turbo cars the air actually going into the engine is so far seperated from the actual atmospheric conditions, that SAE corrections tend to wildly overcompensate.

personally i always go by the actual uncorrected numbers...

ArtieParty

iTrader: (1)

This is exactly what is on every other forum which gives almost no info. I'm looking for an actual explanation, not just "it uses etc and it corrects".

Braineack

iTrader: (62)

I just look at the number it gives my run and I can see it'll correct it by 1.02 or .98 I've never seen much more than that.

harleybutter

iTrader: (34)

Try this link:
Equations: Dyno Correction Factor and Relative Horsepower

Seems to give some equations and reasoning behind it.

Braineack

iTrader: (62)

hey look at that: exactly what he was lookin for.

ArtieParty

iTrader: (1)

That is exactly what I was looking for. Except that it didn't touch on STD correction factors. But I think that's ok.

What I was really looking for is if elevation was part of the equation at all. Because the elevation the dyno has set in WinPEP is wayyyyy off for Newark, DE.

Thanks guys!

harleybutter

iTrader: (34)

Changes in elevation should make a difference in:
Pd = the pressure of the dry air, mb.

ScottFW

iTrader: (4)

Insert comment about FM corrected dyno numbers here.

therieldeal

iTrader: (2)

physical elevation is irrelevant, what's important is density altitude. that could be the number your looking at...

y8s

iTrader: (8)

just as a point of reference, most plots brain and i post are set to STD correction, smoothing at 5.

ArtieParty

iTrader: (1)

No, I'm looking at physical elevation.



If it's a field there, I'm going under the assumption that it may be part of the correction. It says elevation 4500ft, but if you actually google Newark, DE it says average 75 ft.

ArtieParty

iTrader: (1)

Yup, that's what Paul and I do too.

Braineack

iTrader: (62)

weird my runs show 0ft. my SAE correction is .98. yours is the same correction.