A/F ratio for LS-Turbo
06-01-2005, 07:17 AM
#1
1.0 BAR
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Join Date: Nov 2004
Posts: 474
A/F ratio for LS-Turbo
I have a ls-turbo with 450 injectors,apexi v-afc, and I just got my LM-1 wideband. I was wondering what was the best a/f ratio to run. Should I shoot for the same a/f ratio across the board
? And also im running a V-afc which advances your timing should I retard my timing some or just leave it at TDC?? I was also wondering if when street tuning will the A/F ratio be different in every gear or if you tune for one you tune for all? Thank for anything
? And also im running a V-afc which advances your timing should I retard my timing some or just leave it at TDC?? I was also wondering if when street tuning will the A/F ratio be different in every gear or if you tune for one you tune for all? Thank for anything
06-01-2005, 08:19 AM
#2
3.0 BAR
Join Date: Jul 2003
Posts: 6,449
Re: A/F ratio for LS-Turbo
14.7 at cruise, light load
13.5 - 14.0 under a bit of load and acceleration conditions
13.0 at you cross the Vac/Boost threshhold...
12.0 - 12.5 in boost up to 5 psi
11.7 - 12.0 from 5 psi and up (to 10psi)
Those are 'safe' recommendations...
Retarding the base timing at the distributor will help slightly with the advanced timing the Hack creates...not optimal IMO though
13.5 - 14.0 under a bit of load and acceleration conditions
13.0 at you cross the Vac/Boost threshhold...
12.0 - 12.5 in boost up to 5 psi
11.7 - 12.0 from 5 psi and up (to 10psi)
Those are 'safe' recommendations...
Retarding the base timing at the distributor will help slightly with the advanced timing the Hack creates...not optimal IMO though
06-01-2005, 10:07 AM
#3
3.0 BAR
Join Date: Apr 2003
Posts: 2,260
Re: A/F ratio for LS-Turbo
Originally Posted by philly sleeper
I was also wondering if when street tuning will the A/F ratio be different in every gear or if you tune for one you tune for all? Thank for anything
? Thank for anythingOBD1 has a gear ratio table that has "multipliers" for each gear you're in. These multipliers are geared for the stock transmission that drives that ECU (I.E., P28 -> Z6, P30 -> B16, P75 -> LS) so on and so forth.. Dan, Nick, and I had a good conversation about this table, and possibly disabling it, or at least "zeroing" it out so no correction is made, however, at this time, we do not know the impact that doing this will have on the fuel interpolation routine, and overall drivability.
06-01-2005, 02:22 PM
#4
1.0 BAR
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Join Date: Nov 2004
Posts: 474
Re: A/F ratio for LS-Turbo
oh my motor is OBD0. I was also wondering where the best spot to put the wideband o2 sensor? I heard closes to the turbo is best. And thanks to both of use you have answered all my questions great.
06-02-2005, 09:27 AM
#6
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Join Date: Jul 2003
Posts: 6,449
Re: A/F ratio for LS-Turbo
Originally Posted by philly sleeper
oh my motor is OBD0. I was also wondering where the best spot to put the wideband o2 sensor? I heard closes to the turbo is best. And thanks to both of use you have answered all my questions great.
06-02-2005, 11:34 PM
#7
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Join Date: Dec 2002
Posts: 3,830
Re: A/F ratio for LS-Turbo
Originally Posted by xenocron
14.7 at cruise, light load
13.5 - 14.0 under a bit of load and acceleration conditions
13.0 at you cross the Vac/Boost threshhold...
12.0 - 12.5 in boost up to 5 psi
11.7 - 12.0 from 5 psi and up (to 10psi)
Those are 'safe' recommendations...
Retarding the base timing at the distributor will help slightly with the advanced timing the Hack creates...not optimal IMO though
13.5 - 14.0 under a bit of load and acceleration conditions
13.0 at you cross the Vac/Boost threshhold...
12.0 - 12.5 in boost up to 5 psi
11.7 - 12.0 from 5 psi and up (to 10psi)
Those are 'safe' recommendations...
Retarding the base timing at the distributor will help slightly with the advanced timing the Hack creates...not optimal IMO though
06-18-2005, 04:42 PM
#9
0.5 BAR
Join Date: Feb 2004
Posts: 198
Re: A/F ratio for LS-Turbo
Originally Posted by philly sleeper
how will i know if im running to lean in a certain RPM??
personally i wouldnt really take time out at the dist, especially anything over a couple degrees. conversely, i might make the a/f in boost just a little bit richer to attempt to compensate for the increased timing, perhaps somewhere around 11.5:1 or so
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