fritts

iTrader: (5)

I found a website with quite a few injector lag times. I am running 1600 lb/hr Bosch blues and used the Bosch 1545's lag times as it is probably the same injector based on the resistance. I am wondering these values seem extremely high for a dead time, I understand they are large but was kind of surprised about the dead times. What is everyone else using for their large 100- 160 lb injector dead times?
http://injector-rehab.com/kbse/lag.htm

C. Ludwig

iTrader: (27)

I haven't read the new manual (need to get on that) but I assume the new firmware uses the lag time data to interpolate a new on time. Where the old firmware simply added a programmed amount of on time to the base map I'm guessing the new firmware isn't actually adding the lag time value to the base map. So if you program 1.5 ms lag time at 11v the ECU isn't necessarily adding 1.5 ms to the base map which I take it is what you assume is happening.

That's what I would guess without reading the manual.

crispeed

Vechicle specifc.
Every vechicle is different. Electrical load varies a lot. Charging system also varies. Injector dead time at idle and higher rpm also varies. I never tune based on a certain value because from I've experience with many different vechicles is does not work. When you're dealing with small injectors and exact same combinations(stock vechicles) then values can be close.
I have always wanted two maps for this. One for idle conditions and one for higher rpm use. I've seen many charging systems have problems dealing with electrical load at idle only and if you compensate for that then at higher rpms the af'rs are going to be a little off.
Many factory and some other aftermarket ecu's have electrical load compensation for diffeent situations to solve that problem.
You just have to find the happy medium.
Electrical load not only effects the perfomance of injectors. The response of the wastegate solenoid, idle/bac valve, O2 etc. just to name a few are also effected. Some ecu's have voltage compensation for all those systems also.

crispeed

The Haltech ECU uses intelligent fuel injection driver circuitry that compensates for changes in battery
voltage. As the battery voltage falls, the injectors will take longer to turn on and so reduce the effective
open time. To compensate, the ECU applies the Battery Voltage Map to increase the injector ‘on’ time as
the voltage drops. This map can also be considered as an injector dead time map.
Battery Correction Map (Injector Dead Time)
This map should not be used to compensate for a deficient electrical charging system on a vechicle.

classicauto

iTrader: (3)

From the data I have on my 1600's that I got from Yaw power, those times seem in line - but as Crispeed said it varies from vehicle to vechile. (injector to injector)

IIRC I posted my times a in thread in this section. But the actual value I used was different from the specific value for a given voltage due to, as crispeed has stated, the voltage differences throughout the rev range. My alt didn't seem to hold much over 13.7-13.8 with everything on while idling, but would make 14.1 anywhere above 950rpm, so I had to alter the values to find the best middle gorund given what the Haltech's compensation can do (no rpm ranges)

Claudio RX-7

iTrader: (1)

Am i the only one that noticed that both maps on both versions of software is the same exact thing? scales, axis and all?

Claudio RX-7

iTrader: (1)

Shame they dont have the freaking scaling for the 550 stock high imp. from the S5

imdrax

iTrader: (1)

or the 460's......?

Claudio RX-7

iTrader: (1)

Anybody got a way of calculating this? Ive looked around the internet, but i dont think i have found anything useful.

I guess it isnt so important, since most people always upgrade their stock injectors.