I wanna know: How is a chip designed without the car on a dyno?

[baloo]

I just realized that i do not understand how a chip gets designed.
I have several questions that I know there are a bunch of you who know the answers.

1) HOW can the chip-makers just ask you for the octane you use, and exhaust system, and injector size maybe, and a few other factors, and THEN design a chip for you.

2) Is there a software program into which one inserts a bunch of variables, and it then designs the chip? (Is this how Steve Wong does it -- distance-learning?)

3) Given the mods that most of us do to the car (including reducing car weight, tire size, etc.), how can there be a chip programmed for the car without the car actually being "measured", like maybe on a dyno??

4) How in the world do you know if the chip you got is the ideal design for your car?
Certainly one's seat-pants-dyno is pure guesswork.

Appreciate some insight.
Thanks.

[Tippy]

Very simple, they've made the tunes before from other vehicles, then saved the data.

Doubt a tune is estimated, but you could if you knew the VE difference one engine makes from the newer part(s).

Is it perfect? No, but even with say hypothetical 15% variance (would be extreme I'd imagine) between 2 different engines with the exact same parts and bits, it'll be good enough to drive fine.

[kenikh]

This is why customizable EMS are so nice. You can keep on tweaking.

[Miguel Antonett]

Chip, on a 930?

[baloo]

Originally Posted by Miguel Antonett

Chip, on a 930?

Sorry -- not 930 but a 3.2 Carrera turbo-to-be.

[Tippy]

Originally Posted by baloo

Sorry -- not 930 but a 3.2 Carrera turbo-to-be.

The chip I ran before on my turbo 3.2 was made by Protomotive. It did have some problem areas. PO sent it to them telling the issues, and they addressed these for about $100.

My understanding is Steve Wong offers the same, price unknown.

[baloo]

Thanks for the responses.
Customizable EMS makes the most sense, however, I think this will be far down the road, because this Porsche is just a project, never intended to race (and possibly never intended to drive! --- yah, it's one of THOSE cars).

[Tippy]

You can run an MSD BTM (boost timing master) to retard timing under boost and a BEGI (Bell Engineering) rising rate fuel pressure regulator to raise fuel pressure under boost not requiring a chip.