KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc)

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PaulB

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	KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « on: September 24, 2018, 07:13:17 AM »

Hello!

I would like to make a confirmation for KRKTE and TVUB calculation ..

Engine : 1.8T 20V
Displacement : 1984cc (stroked engine )

KRKTE : 0.03905238 ( aprox )
TVUB : Is the FNPW_OFFSET on the TVUB.jpg file? Roll Eyes


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eg4

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	Re: KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « Reply #1 on: September 26, 2018, 02:16:47 AM »

you can use this calculator for krkte http://nefariousmotorsports.com/forum/index.php?topic=4021.0 and fnpw_offset is your tvub. But it depends from the fuelpressure


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nyet

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	Re: KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « Reply #2 on: September 26, 2018, 10:03:30 AM »

Note that both offset and krkte depend on pressure.


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PaulB

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	Re: KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « Reply #3 on: September 27, 2018, 07:16:13 AM »

Hello!!
Thank you !

I will keep the stock 3bar frp! So i suppose the TVUB will be ok..

Also , do i need to modify the Volt axis on the TVUB map ,so they correspond with the siemens deka ''fnpw_offset'' Values?


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nyet

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	Re: KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « Reply #4 on: September 27, 2018, 07:56:42 AM »

Quote from: PaulB on September 27, 2018, 07:16:13 AM

I will keep the stock 3bar frp! So i suppose the TVUB will be ok..

Note that not all FPRs are 3bar stock, 3 bar is only commonly used as a reference pressure for fuel injectors.

Quote

Also , do i need to modify the Volt axis on the TVUB map ,so they correspond with the siemens deka ''fnpw_offset'' Values?

Yes, or re-interpolate.

Also, like flow, TVUB also more or less scales linearly (albeit not quite) with the square root of fuel pressure (as a very rough approximation). Some injector datasheets come with a method for approximating TVUB with respect to voltage and pressure, some have complete charts.

eg. for ev14:
https://nyet.org/cars/info/ev14-latency/


« Last Edit: September 27, 2018, 08:02:52 AM by nyet »	Logged

PaulB

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	Re: KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « Reply #5 on: September 29, 2018, 11:42:02 AM »

I have the stock 3bar frp , thats for sure..

I Think i will start with the mentioned values and see the STFT..

maybe i will make FKKVS and HFM 1's .. No?


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nyet

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	Re: KRKTE and TVUB Confirmation - Siemens Deka 80lb (875cc) « Reply #6 on: September 29, 2018, 12:57:29 PM »

Quote from: PaulB on September 29, 2018, 11:42:02 AM

I have the stock 3bar frp , thats for sure..

I Think i will start with the mentioned values and see the STFT..

maybe i will make FKKVS and HFM 1's .. No?

More than one way to skin a cat, but in general, you can all ones FKKVS to start with, and if possible start with a known good stock HFM that matches your MAF and intake setup. If you have a cone filter or any other CAI setup, all bets are off.


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