Hwy.Mode Fuel/Spark
Thread Starter
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Hwy.Mode Fuel/Spark
This is in the CONSTANTS table of TunerCats.
What is it?????
MIN Coolant Temperature For Highway Spark Advance.....151.3 c
MIN Vehicle Speed For Highway Mode Fuel.......................255 mph.
Whatever it is I don't think I can get it before my engine melts down.
And it's pretty hard to find a highway you can run 255mph on these days.
What are these parameters, boys and girls?????
What is it?????
MIN Coolant Temperature For Highway Spark Advance.....151.3 c
MIN Vehicle Speed For Highway Mode Fuel.......................255 mph.
Whatever it is I don't think I can get it before my engine melts down.
And it's pretty hard to find a highway you can run 255mph on these days.
What are these parameters, boys and girls?????
Melting Slicks
Joined: Apr 2001
Posts: 2,120
Likes: 223
From: Ca.
Re: Hwy.Mode Fuel/Spark (VetNutJim)
Hwy mode spark and fuel is in the tdf from GM-however the factory left it disabled by setting those parameters. As to why? Anybody????
I have enabled mine by decreasing the limits to where I wanted it to engage-and it did help a bit with mileage.
Note all the other parameters to enable it-map rpm etc. and also f/a vs map-just have to decide based on where you "hit cruise" conditions.
I have enabled mine by decreasing the limits to where I wanted it to engage-and it did help a bit with mileage.
Note all the other parameters to enable it-map rpm etc. and also f/a vs map-just have to decide based on where you "hit cruise" conditions.
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
Re: Hwy.Mode Fuel/Spark (drive it)
you can find some info on the "highway mode fuel & spark" on the Thirdgen site, just do a search in the "DIY prom section".
if you decide to turn it on be cautious (don't want to lean it out too much).
from one post I read on the thirdgen site they recommended not going over 15.2 to 1 on the air fuel ratio to stay safe.
RJ
if you decide to turn it on be cautious (don't want to lean it out too much).
from one post I read on the thirdgen site they recommended not going over 15.2 to 1 on the air fuel ratio to stay safe.
RJ
Thread Starter
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Re: Hwy.Mode Fuel/Spark (ol,RJ)
Hmmm. I don't know boys and girls.
If the GM Powertrain was afraid to fool with it.... maybe I better leave it alone also.:nonod:
Maybe I'd better go back to the fans or something simple. :steering:
If the GM Powertrain was afraid to fool with it.... maybe I better leave it alone also.:nonod:
Maybe I'd better go back to the fans or something simple. :steering:
Instructor
Joined: Aug 2002
Posts: 179
Likes: 1
From: Oxford AL
Re: Hwy.Mode Fuel/Spark (VetNutJim)
If the GM Powertrain was afraid to fool with it.... maybe I better leave it alone also.:nonod:
