FAST XFI 2.0 Question

John Nechiporchik · 05-02-2016, 01:08 PM

When changing the tune up mode from Speed Density to ALPHA N on the FAST XFI 2.0 system, what changes, besides the configuration parameters, are needed to facilitate the switch? The application is a 350 LT1 stock eliminator car. We are dyno testing the motor tomorrow so I would like to develop a base tune for Alpha N , open loop.
It is my understanding that the MAP sensor should be removed from the manifold and allowed to see atmosphere with the electrical connector attached and the hole in the manifold where sensor was removed should be plugged.
Is this the correct process?
Also, I have fuel and timing tables from another LT1 stocker that I can use as a starting point.
Thanks for your help.
John

Ed Wright · 05-02-2016, 04:08 PM

I have to wonder why you would want to use AlphaN, instead of Speed Density?

Greenlight · 05-02-2016, 04:37 PM

What size injectors are you using?

John Nechiporchik · 05-02-2016, 07:32 PM

Ed, Based on comments of several LT1 racers running similar combos and reading the previous threads on this site.
Greenlight, 30 Lb. injectors.

Greenlight · 05-02-2016, 07:55 PM

John,

Please check your P.M.

John Nechiporchik · 05-02-2016, 08:22 PM

Greenlight, Got the message and sent response.
Thanks,
John

05-02-2016, 01:08 PM	#1
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 316 Likes: 84 Liked 13 Times in 7 Posts	FAST XFI 2.0 Question When changing the tune up mode from Speed Density to ALPHA N on the FAST XFI 2.0 system, what changes, besides the configuration parameters, are needed to facilitate the switch? The application is a 350 LT1 stock eliminator car. We are dyno testing the motor tomorrow so I would like to develop a base tune for Alpha N , open loop. It is my understanding that the MAP sensor should be removed from the manifold and allowed to see atmosphere with the electrical connector attached and the hole in the manifold where sensor was removed should be plugged. Is this the correct process? Also, I have fuel and timing tables from another LT1 stocker that I can use as a starting point. Thanks for your help. John

05-02-2016, 04:08 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: FAST XFI 2.0 Question I have to wonder why you would want to use AlphaN, instead of Speed Density? __________________ Ed Wright 4156 SS/JA

05-02-2016, 04:37 PM	#3
Greenlight Member Join Date: Dec 2004 Posts: 215 Likes: 16 Liked 79 Times in 22 Posts	Re: FAST XFI 2.0 Question What size injectors are you using?

05-02-2016, 07:32 PM	#4
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 316 Likes: 84 Liked 13 Times in 7 Posts	Re: FAST XFI 2.0 Question Ed, Based on comments of several LT1 racers running similar combos and reading the previous threads on this site. Greenlight, 30 Lb. injectors.

05-02-2016, 07:55 PM	#5
Greenlight Member Join Date: Dec 2004 Posts: 215 Likes: 16 Liked 79 Times in 22 Posts	Re: FAST XFI 2.0 Question John, Please check your P.M.

05-02-2016, 08:22 PM	#6
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 316 Likes: 84 Liked 13 Times in 7 Posts	Re: FAST XFI 2.0 Question Greenlight, Got the message and sent response. Thanks, John