ETC Area Scalar

[imaboa]

I'm working on a 99 Vette w/ a 90mm throttle body. The value in the stock file is 0.0255

What does the ETC area scalar value represent? Is there a good method for changing it for a larger throttle body? Or is it just some simple math?

[Higgs Boson]

simple math, smaller number for a bigger TB.

[oakley6575]

0.0192 is what I have in for my 90mm. It definitely changes idle characteristics.

[joshmith]

ls1tuningguide.com has some great writeups, including a spreadsheet for etc scalar resizing for various throttle body sizes

[printmanjackson]

how is this calculated?

I downloaded the spreadsheet "ETC Area Scalar Throttle Body Resizing"

how do you use this information?

going from a stock 78mm TB to a 90mm TB

[max1]

how is this calculated?

I downloaded the spreadsheet "ETC Area Scalar Throttle Body Resizing"

how do you use this information?

going from a stock 78mm TB to a 90mm TB

^^ same question , how do you use the spreadsheet?

[bigfatls6]

is this only something you change on drive by wire cars? Or does this need to be addressed on cable driven also?

[PitchblackC3]

etc -electronic throttle control. aka DBW

[gn2beatu]

I thought it was the surface area of the throttle blade in millimeters. Like 4391mm is the value for my stock LS2 Trailblazer. Im not 100% sure though if it is the surface area of the TB blade, or the opening where the TB sits (which is slightly bigger). Maybe someone from the HP team can chime in here.

[DSteck]

I thought it was the surface area of the throttle blade in millimeters. Like 4391mm is the value for my stock LS2 Trailblazer. Im not 100% sure though if it is the surface area of the TB blade, or the opening where the TB sits (which is slightly bigger). Maybe someone from the HP team can chime in here.

Check what section you're in.










OP... a 90mm uses 0.0192 in the ETC Area Scalar.

[Rinkrat456]

OP... a 90mm uses 0.0192 in the ETC Area Scalar.

If a stock throttle body has been ported, where would one measure to make sure the ETC area scalar is corrected?

[DSteck]

Porting doesn't usually intrude on the blade bore, so there's no need to change it.

[Rinkrat456]

Porting doesn't usually intrude on the blade bore, so there's no need to change it.

Would anything have to be altered as far as idle or low speed throttle transitions go?

[DSteck]

No.

[Chris@HPTuners]

the scalar is used to convert from Desired Effective Area (mm2) to Desired ETC %.

ie.

100% = TB WOT Area x scalar

[FastChevyRacers]

Who know how much etc scalar for 99 LS1 vette with NW102mm tb?
Thanks