Initial tune woes with new manifold and TB on my 355

[Mr DOHC]

There is a tune in the $12P custom tune thread called VK355.bin.
The mods on that are similar but a few are bigger like the cam and compression.
I opened the bin, which runs Bosch 775 blue tops (260cc) and he’s running lower values in the VE table.

Something doesn’t add up

[Dylan]

That's my tune that one. From memory the fuel pressure is at 50psi maybe? Up from the usual 43.

[Mr DOHC]

Yeah yours says 45psi static. I wonder if that’s my issue, the vacuum signal on mine is pulling too much pressure?

[Mr DOHC]

Just set my fuel reg to a static 45PSI and went for another drive. made no difference really.

as you can see below i am at 101 on the VE, 2250RPM 18.9% duty cycle and i'm maxed out at 15.8: AFR.

[vlad01]

You need to up your injector rate by at least 20% looking at that, probably more.

[Dylan]

As mentioned by Vlad, up the injector rate, scale the VE table to suit and keep tuning.

[Mr DOHC]

You need to up your injector rate by at least 20% looking at that, probably more.

So you mean the kinjflow?
From 0.061 to 0.048 for example?

[Mr DOHC]

So i just took it for a drive, i did a quick log and it was still lean. stopped to make a few changes.
Now here comes the fuck up, rather than hit the upload button on that map, i hit the upload the whole bin. I didnt think there would be much different in the map but now when i hit the throttle, its just dead lean 19.5:1. The initial AE kicks a smidge of fuel in so i could blip the throttle over and over to get it to move but it took about 1.5km to get to 60kph.
What setting could be doing that?

i have confirmed the Kinjflow is right. The injector biases are right too.

[vlad01]

You need to up your injector rate by at least 20% looking at that, probably more.

So you mean the kinjflow?
From 0.061 to 0.048 for example?

The other way, 0.061 to 0.073. Just keep increasing until the AFRs and VEs are in a good range.

With my V6 engine my injector rates needed to be upped until it was almost stock value with 39lb injectors. The calculated half injector rate was way not enough for how much more fuel it wanted. Like I said, the Kinjflow calculator is only a very rough approximation and real life engine can want more or less fuel by a large margin. In my case it was somewhere like 70% more than calculated.

[Mr DOHC]

Ah. So by lowering the kinjflow to 0.48 I essentially took fuel out, then by cutting the VE values by 1/4 as well I took fuel out twice?