Where are other latency values for RB30?

[RB30-POWER]

Hey Guys,

Was just wanting to know where the other latency values are for RB30 bin files.

What i have found is that if you increase the latency to take into account the larger injectors, when the voltage drops lower then 14V, the afr are to lean.

For example if i leave the standard latency values, when the voltage drops the afr stays spot on, no lean offs.

I feel that if you increase 14V value the rest of the table must also be changed to match the increased latency times.

I have looked at the location of the 14V value that is used in nistune,but that hex row of figures does not seem to be a complete table of latency, as the figures converted to dec are not logical for a latency vs voltage table?

Any ideas appreciated.

Its not a major problem at this stage, i just keep the standard injector values even with the larger injectors.

Im not sure how critical the latency values are with the low impedance injector drives, as i'm sure they use a peak and hold injector driver (high current to open injector then low to hold injector open without burning it out) rather then a saturated type driver that where the current is limited by injector impedance?

[Matt]

Z32/Q45 have two latency address. one for 14 volt and then there is another compensation value for when it drops off less than 14 volts... the following from the XDF for tunerpro

Injector Latency/TS
Delay between injector pulse and injector opening at an assumed 14volts.
Affects idle performance. Typically 0.75 - 0.85 ms depending on injector size and brand. ms. Address 0x7F88
[IGN_TIME,&H7F88,1,1,1,1,Void blast-off time]

Injector Latency/DTS
Coefficient used to calculate true injector latency at current battery voltage IF voltage is below 14V.... ms/Volt at address 0x7F87


So since R31/Z31/VLT code is very similar, I ran a routine locato over this code and found it... add the following to your address file

Z31: (0xBF73)
LATENCY_CHANGE,&H3F73,1,1,1,1,Latency Change ms/V

R31: (0xBF3D)
LATENCY_CHANGE,&H3F3D,1,1,1,1,Latency Change ms/V

VLT: (0xBF73)
LATENCY_CHANGE,&H3F73,1,1,1,1,Latency Change ms/V

Let me know how that goes

[RB30-POWER]

Nice work Matt.

Can't really try it properly until I do the headgasket on my car, but nice to know its there now

[Matt]

welll just found out that Z31 1984-85, 1986NA and 1986-1989 ECUs have different addresses for this....

1984-1985

#Void blast-off time
IGN_TIME,&H3F3E,1,1,1,1,Void blast-off time

#Coefficient used to calculate true injector latency at current battery
LATENCY_CHANGE,&H3F3D,1,1,1,1,Latency Change ms/V

1986 NA
#Void blast-off time (specific to dual rom Z31 86 model)
IGN_TIME,&H3F74,1,1,1,1,Void blast-off time

#Coefficient used to calculate true injector latency at current battery
LATENCY_CHANGE,&H3F73,1,1,1,1,Latency Change ms/V


1986-1989
#Void blast-off time
IGN_TIME,&H3F88,1,1,1,1,Void blast-off time

#Coefficient used to calculate true injector latency at current battery
LATENCY_CHANGE,&H3F87,1,1,1,1,Latency Change ms/V


Latency measured on scope reads 0.02ms change for each increment (measured 80 to 130 change makes 1ms difference)

Latency change measured on scope is 0.5ms when changed from 0 to 255 at 11.8v on bench