Maf + Turbo + HP tuners?
11-23-2006, 10:14 PM
#1
Maf + Turbo + HP tuners? All of the 2-3bar upgrades on HP tuners are listed as SD.
Can you run 2 bar on an '04 ECU with a Maf? I live in San Diego and love to drive from the ocean where I live out to the desert and some times up into the high desert (where there can be snow) all in one day. I dig the idea of keeping my maf.
If I do go SD, can the intake temperature sensor react fast enough to keep a poorly intercooled set up working properly?
Can you run 2 bar on an '04 ECU with a Maf? I live in San Diego and love to drive from the ocean where I live out to the desert and some times up into the high desert (where there can be snow) all in one day. I dig the idea of keeping my maf.
If I do go SD, can the intake temperature sensor react fast enough to keep a poorly intercooled set up working properly?
11-23-2006, 10:37 PM
#2
short answer: no
longer version: maf has an limit to how much air it can measure (computer limit, not physical limit) so any FI application outflows it instantly.
don't worry about accounting for weather, the hot air from turbos will mess with it way more than ambient.
longer version: maf has an limit to how much air it can measure (computer limit, not physical limit) so any FI application outflows it instantly.
don't worry about accounting for weather, the hot air from turbos will mess with it way more than ambient.
11-24-2006, 02:48 PM
#3
Then how did the new LS7 that hot rod tested with a new cam handle 600 hp through a MAF?
Is it possible to make an SD turbo car run factory smoothe under all atmospheric conditions? Or is almost as close as most people are able to get their tunes?
Is it possible to make an SD turbo car run factory smoothe under all atmospheric conditions? Or is almost as close as most people are able to get their tunes?
11-24-2006, 03:00 PM
#4
the new LS7 computer is a VERY different beast from what we're used to.
the fact that people achieve great results with MAF, doesn't mean they do it right--that's the big difference.
the final formula for fueling (pulse width to be precise) in SD is:
IPW=(VOL* VE * MAP)/(AFR * IFR * R * TEMP)
VOL is cylinder volume
VE is volumetric efficiency
MAP is manifold absolute pressure
AFR is air fuel ratio
IFR is injector flow rate
R is a constant
TEMP is a blend between coolant and intake temps
so as long as your MAP can account for all turbo conditions (aka NOT stock 1bar), and IAT is quick and precise (look on the ls1gto board for omega IAT mod) you should have temperatures and pressures taken into account for.
most aftermarket engine managment systems are speed density, ie. AEM is SD, and there's many 1000rwhp+ supras out there with it. MoTeC can take up to 5bar MAP and is used in just about every real race car out there.
the fact that people achieve great results with MAF, doesn't mean they do it right--that's the big difference.
the final formula for fueling (pulse width to be precise) in SD is:
IPW=(VOL* VE * MAP)/(AFR * IFR * R * TEMP)
VOL is cylinder volume
VE is volumetric efficiency
MAP is manifold absolute pressure
AFR is air fuel ratio
IFR is injector flow rate
R is a constant
TEMP is a blend between coolant and intake temps
so as long as your MAP can account for all turbo conditions (aka NOT stock 1bar), and IAT is quick and precise (look on the ls1gto board for omega IAT mod) you should have temperatures and pressures taken into account for.
most aftermarket engine managment systems are speed density, ie. AEM is SD, and there's many 1000rwhp+ supras out there with it. MoTeC can take up to 5bar MAP and is used in just about every real race car out there.
