timing and fmu
09-16-2005, 08:59 AM
#3
3.0 BAR
Join Date: Jul 2003
Posts: 6,449
Re: timing and fmu
Originally Posted by tuname420
would it be ok to run my stock timing settings if im using a fmu and running around 5.5 -6.5 psi i have 1 step colder plugs gapped at .028?
09-16-2005, 10:01 AM
#5
3.0 BAR
Join Date: Jul 2004
Posts: 3,207
Re: timing and fmu
Originally Posted by xenocron
Originally Posted by tuname420
would it be ok to run my stock timing settings if im using a fmu and running around 5.5 -6.5 psi i have 1 step colder plugs gapped at .028?
i would listen to this guy, mr 300hp on a stock LS lol.
09-16-2005, 08:22 PM
#6
0.0 BAR
Join Date: Aug 2003
Posts: 37
Re: timing and fmu
Originally Posted by xenocron
Originally Posted by tuname420
would it be ok to run my stock timing settings if im using a fmu and running around 5.5 -6.5 psi i have 1 step colder plugs gapped at .028?
09-17-2005, 01:34 AM
#9
1.5 BAR
Join Date: Oct 2003
Posts: 1,454
Re: timing and fmu
Originally Posted by turboDA6
Originally Posted by xenocron
Originally Posted by tuname420
would it be ok to run my stock timing settings if im using a fmu and running around 5.5 -6.5 psi i have 1 step colder plugs gapped at .028?
i would listen to this guy, mr 300hp on a stock LS lol.
09-20-2005, 02:19 PM
#10
3.0 BAR
Join Date: Jul 2003
Posts: 6,449
Re: timing and fmu
Ok, the technical reason...
Leave the timing stock...dont run over 6 psi on an FMU.
In vacuum (part throttle) driving...you want everything the same. All of the fuel and timing maps will be affected if you retard at the distributor, leaving you slightly laggy and running richer off boost than what you should be doing.
Stock maps are severly safe on the timing end. Me and I know other tuners dont generally retard any timing until about 4 psi of boost from the stock maps...whats 2 more psi at such a low level of power. You will basically be running the timing from the last column of fuel maps from 0-6psi...which is fine. No major risk there.
Besides, how many fruit cakes are running around on the AFC hack which actuall ADVANCES your timing in that area just fine.
The major risk with an FMU is the high fuel rail pressures and the chance that an injector will fail or lock up under boost...not the timing.
Leave the timing stock...dont run over 6 psi on an FMU.
In vacuum (part throttle) driving...you want everything the same. All of the fuel and timing maps will be affected if you retard at the distributor, leaving you slightly laggy and running richer off boost than what you should be doing.
Stock maps are severly safe on the timing end. Me and I know other tuners dont generally retard any timing until about 4 psi of boost from the stock maps...whats 2 more psi at such a low level of power. You will basically be running the timing from the last column of fuel maps from 0-6psi...which is fine. No major risk there.
Besides, how many fruit cakes are running around on the AFC hack which actuall ADVANCES your timing in that area just fine.
The major risk with an FMU is the high fuel rail pressures and the chance that an injector will fail or lock up under boost...not the timing.
