get re-flashed and still use 91?????
Jun 20, 2005, 11:30 PM
#1
Evolving Member
Thread Starter
Join Date: Jun 2005
Location: RIALTO,CALIFORNIA
Posts: 107
Likes: 0
Received 0 Likes
on
0 Posts
get re-flashed and still use 91?????
ok i was just wodering i sent my car for the reflash but is it ok to put 91 octane i heard only 93 octane and up could be use with reflashes what about a 100 i know where to get that need opnions thanks guys 
Jun 21, 2005, 07:39 AM
#2
Evolving Member
iTrader: (1)
Join Date: Jan 2005
Location: Northern Virginia
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by EvOJoHnY0312
ok i was just wodering i sent my car for the reflash but is it ok to put 91 octane i heard only 93 octane and up could be use with reflashes what about a 100 i know where to get that need opnions thanks guys
but i can make out what your saying. if thats the case whynot opt for a s-afc...
it only makes more sense to go the s-afc route.
Jun 21, 2005, 09:33 AM
#3
Account Disabled
iTrader: (91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,850
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by temps
rofl that doesnt even qualify for a run-on sentence.
but i can make out what your saying. if thats the case whynot opt for a s-afc...
it only makes more sense to go the s-afc route.
but i can make out what your saying. if thats the case whynot opt for a s-afc...
it only makes more sense to go the s-afc route.
If a reflash is set for 91 octane that would be the best approach.
Using a SAFC only results in overly advanced ignition timing and the ecu pulling a lot of timing in an uneven manner as a result.
Jun 21, 2005, 10:25 AM
#5
Evolving Member
iTrader: (1)
Join Date: Jan 2005
Location: Northern Virginia
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DynoFlash
Actually that is not correct.
If a reflash is set for 91 octane that would be the best approach.
Using a SAFC only results in overly advanced ignition timing and the ecu pulling a lot of timing in an uneven manner as a result.
If a reflash is set for 91 octane that would be the best approach.
Using a SAFC only results in overly advanced ignition timing and the ecu pulling a lot of timing in an uneven manner as a result.
Jun 21, 2005, 11:32 AM
#6
Account Disabled
iTrader: (91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,850
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by temps
Could someone explain that for a layman.
SAFC adjusts this by reducing the mass air flow KARMAN signal by a fixed percentage - e.g. say 7 % less. This results in the ecu running on a lower load zone in the ignition timing mapping - a zone you would usually run under partial boost. The stock ecu mapping runs more advanced timing in the lower load zones.
Particularly with 91 octane fuel a leaner a/f and more highly advanced timing causes knock activity (detonation) which causes the ecu to pull timing. The problem with this apporach is you wind up with a lean mixture and retarded timing = high egts and very low tq.
SAFC can get decent results but it is no match for a reflash which has the ability to indepenadntly set a/f targets and ignition timing, adjust both main fuel and ignition maps and also adjust various other parameters.
Jun 21, 2005, 12:13 PM
#7
Evolving Member
iTrader: (1)
Join Date: Jan 2005
Location: Northern Virginia
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DynoFlash
The stock evo a/f targets are overly rich (too much fuel - especially after 5,000 rpms).
SAFC adjusts this by reducing the mass air flow KARMAN signal by a fixed percentage - e.g. say 7 % less. This results in the ecu running on a lower load zone in the ignition timing mapping - a zone you would usually run under partial boost. The stock ecu mapping runs more advanced timing in the lower load zones.
Particularly with 91 octane fuel a leaner a/f and more highly advanced timing causes knock activity (detonation) which causes the ecu to pull timing. The problem with this apporach is you wind up with a lean mixture and retarded timing = high egts and very low tq.
SAFC can get decent results but it is no match for a reflash which has the ability to indepenadntly set a/f targets and ignition timing, adjust both main fuel and ignition maps and also adjust various other parameters.
SAFC adjusts this by reducing the mass air flow KARMAN signal by a fixed percentage - e.g. say 7 % less. This results in the ecu running on a lower load zone in the ignition timing mapping - a zone you would usually run under partial boost. The stock ecu mapping runs more advanced timing in the lower load zones.
Particularly with 91 octane fuel a leaner a/f and more highly advanced timing causes knock activity (detonation) which causes the ecu to pull timing. The problem with this apporach is you wind up with a lean mixture and retarded timing = high egts and very low tq.
SAFC can get decent results but it is no match for a reflash which has the ability to indepenadntly set a/f targets and ignition timing, adjust both main fuel and ignition maps and also adjust various other parameters.