Idle AFR changing whilst Idling

[Terminal_Crazy]

Thanks for the input & feedback guys.

I think i'm going to bin these injectors off & get some new ones if anyone has any good suggestions.

I've set the voltage offsets up as per the calcs i was given.
This got the PW up into the 2ms range for idle but the VE tables went to pot.
As I played with VE the tables keep maxing out and I'm back lying to the system with 38 for the INJ Constant with 42's in.

The RHS is going progresivly leaner the more I play.
When the motor is pig rich it's fine.
As I lean it back out it's less happy. It buzzes and vibes more.

I was going to play & swap them over or piss about with the older ones but then I've just got to waste more time doing that again so i'm biting the bullet and get another set.

Thanks
Mitch

[Terminal_Crazy]

The new injectors have arrived and i'm still dialing them in.
The car is definately feeling different.
The low speed surge is back but the current .bin is heavly copied from the LT4 .bin i have rather than my previous setup.

It feels to have more power up top.
It was spinning the wheels in third around 78mph without much effort.
The fastest RPM i wound it to was 5500 at 67mph.
It felt higher but the roads are just above freezing.

The idle isn't as sweet yet as before.
Fueling is still a bit off on the Individual injector settings, but the VE table is a much smoother shape and has a much wider spread of values than previously.

So so far looking good.

Thanks
Mitch

[kur4o]

Do you have some data sheet for the new injectors?
If you have ls1 style injector data you can try my newest patch.

What is that lt4 bin you have? As far as I know lt4 was introduced 1996.

[Terminal_Crazy]

Do you have some data sheet for the new injectors?

Hm, only the usual...
Static flow @ 3, 3.5 and 4 bar
Dyn flow 50% duty, 3000 pulse/min 10ms ' 3 bar
Dyn flow Idle duty, 800 pulse/min 1.5ms @ 3 bar

And a list of Dead times (Latency) - Voltage vs ms

So far the VE tables are settling down nicely using Steveo's Trimalyzer, so a happy camper.

If you have ls1 style injector data you can try my newest patch.

Maybe when i get these up to par.
Is that the fixed fuel pressure one?
I presume i could extrapolate the data from the other Fuel pressure data?

Would that work by disconnecting the vac line to the fuel regulator?
What's your opinion on the Aeromotive one as I was looking at them this last week esp. with a fuel gauge.
How good is the stock unit (23 years old now)?
What sort of power would the stock fuel pump be rated for?

I think I remember reading Steveo damping the map sensor response down to smooth the pulses to the Fuel regulator, Any thoughts on that?

What is that lt4 bin you have? As far as I know lt4 was introduced 1996.

That was in the recent attachment on the LT1 diss zip.
I can't remember who posted it.
I just picked bits of the LT4 tables out that I liked compared to the stock Z28 vs my recent tunes.

Thanks
Mitch

[dzidaV8]

What's your opinion on the Aeromotive one as I was looking at them this last week esp. with a fuel gauge.

From my experience, those are overpriced and not reliable, one leaked right out of the box, the other started losing pressure after a few weeks...

[kur4o]

I am glad your getting closer to the perfect tune.
I only idle the car twice with the regulator so don`t have any usable data how good it is.
I put aeromotive 13107 since I have it from a long time. It is marked as 07/2011 unit, so shouldn`t give any real hints of the unit produced today.
Stock one looked pretty good and as long it keeps constant 3 bar pressure I wouldn`t bother replacing it.
I have plans to bump the pressure to 4 bars and installed it since the rail was off anyway.
I read somewhere that stock pump is good for 450hp, but I am not sure it will handle increased 4 bar pressure.

Patch will work with vacuum disconnected and constant fuel rail pressure.
You will need to have a good injector data though.

I checked a company called Injector Dynamics. They seem to provide good data, but are really expensive.
If you know how much hp you are making you can calculated the size of injectors needed. Bigger doesnt always mean better.