Weather station ET predictor suggestions

[Mike Fuller]

My system just died and I need some opinions on what everyone feels about the available systems.

[Hacksaw]

I use a handheld Computech. Find it user friendly and accurate in the predictions.

[FireSale]

I have a PerformAIRE Eclipse, which a lot of my fellow racers swear by but I swear at. I routinely run 0.2-0.3 under the devices prediction.

Here are the predictions and my ETs from last Sunday:
13.18/12.858
13.14/12.835
13.146/12.817

I burned hours trying to come up with a number to subtract from the machine for my dial, but If I had ignored it and paid more attention to the free time slip I would have just dialed 12.80.

[Ed Wright]

Crew Chief Pro software in your laptop. Enter your weather data along with your runs, after three entered at a given track, it will predict dead nuts, if your car repeats well.

[Darrel Goheen]

Originally Posted by Ed Wright

Crew Chief Pro software in your laptop. Enter your weather data along with your runs, after three entered at a given track, it will predict dead nuts, if your car repeats well.

Do you use a different data file for each track?

[Lenny5160]

Originally Posted by Darrel Goheen

Do you use a different data file for each track?

I do.

Ed's statement about 'three runs' is a little misleading. The software only predicts ET based on one single run that you choose as your base.

Sometimes I'll flip it through a couple different 'base' runs to see if the predictions match.

I've spent a lot of time analyzing runs and tweaking the formulas, but the stock ones are pretty darned good. Probably gotten myself lost more than I've helped.

[Ed Wright]

Originally Posted by Darrel Goheen

Do you use a different data file for each track?

It asks you to. If your car dead hooks everywhere, I would think it would not matter. I just follow the instructions. Been married 52 years, learned to do that.

[cad]

Originally Posted by Darrel Goheen

Do you use a different data file for each track?

My buddy does use a unique database for each track.

[Mike Jones]

Originally Posted by FireSale

I have a PerformAIRE Eclipse, which a lot of my fellow racers swear by but I swear at. I routinely run 0.2-0.3 under the devices prediction.

Here are the predictions and my ETs from last Sunday:
13.18/12.858
13.14/12.835
13.146/12.817

I burned hours trying to come up with a number to subtract from the machine for my dial, but If I had ignored it and paid more attention to the free time slip I would have just dialed 12.80.

I don`t find my PerformAire to be much help predicting ET, either.
Thought it was just me
Guess I`m not alone.
Thanks
Mike A114

[Altronics]

Originally Posted by FireSale

I have a PerformAIRE Eclipse, which a lot of my fellow racers swear by but I swear at. I routinely run 0.2-0.3 under the devices prediction.

Here are the predictions and my ETs from last Sunday:
13.18/12.858
13.14/12.835
13.146/12.817

I burned hours trying to come up with a number to subtract from the machine for my dial, but If I had ignored it and paid more attention to the free time slip I would have just dialed 12.80.

We invented and have been manufacturing PerformAIRE weather stations for 25 years. I don't think we would have been doing it this long if our systems were not capable of working correctly.

In order for any car to be predictable with any weather system the car must be repeatable and jetted correctly to respond to air change. If your car will NOT run the same 60' (+/0.002) and ET(+/-0.005) on back to back runs in the with the same DA (+/-100DA), it will never be more predictable then its best back to back run.

Also very important is the Data you enter. Garbage in Garbage out.

Per our instructions: You need to have at least 1000' change in DA across 5 to 6 runs in order to generally get a good prediction. Entering 2 or 3 runs with only a few hundred feet change in DA will generally NOT give a good prediction.


We are always happy to take a look at your data and try to help you. You are free to email us directly with the run information you are trying to use, or if you like post it here and I will comment on it.