LS3 engine Injector Bank assignments..... letters versus numbers

[Blue70SS]

Question regarding this table...... does anyone know if A=cylinder1, B=Cylinder 2, C=Cylinder 3, etc. Seems like it should show Bank 1 injectors as A-C-E-G for 1-3-5-7. Instead it looks like bank 1 and bank 2 injectors don't correspond to bank 1 and 2 cylinders.

This is in a 2010 Camaro, 18 lbs boost on a TVS2300, squash twin fuel pumps on a return system, wet nitrous with direct port injection.

[Blue70SS]

The problem I'm trying to correct is bank 2 wideband AFR runs about .5 AFR higher than bank 1 only on WOT during 1/4 mile data logging. Narrowband sensors are off about the same percent. Narrow band sensors were swapped and the problem doesn't follow. Both wide bands have been recalibrated. Next step is to swap widebands and recalibrate to open air for about the 4th time, but not expecting a change since the narrowband swap proved the difference I think. I was thinking of doing an individual injector correction, but stumped by the letter to number correlation. Exhaust and intake have both been smoke tested for leaks and everything is sealed up good.

[Blue70SS]

My theory is fuel is supplied to bank 2 fuel rail and then flows out both ends to bank 1.... I think bank 2 gets a scavaging effect that lowers the fuel flow versus the dead ended bank 1 under higher flow conditions. Problem occurs with or without nitrous on..... so nothing to do with nitrous jetting.

[statesman]

Question regarding this table...... does anyone know if A=cylinder1, B=Cylinder 2, C=Cylinder 3, etc. Seems like it should show Bank 1 injectors as A-C-E-G for 1-3-5-7. Instead it looks like bank 1 and bank 2 injectors don't correspond to bank 1 and 2 cylinders.

I think the A-H follows the firing order.

[Blue70SS]

Thanks Statesman,!

So sounds like this: (the "2-6" in the firing order explains the odd diagram)
1-8-7-2-6-5-4-3 Firing Order LS3
A-b-C-d-e-F-g-H Letter assignments
1-2-1-2-2-1-2-1 Corresponding Bank Assignments

So for "injector individual correction" based on lettering A through H,
to add fueling to bank 2:
Increase the numbers for b-d-e-g injectors

Sound correct?

[statesman]

Sounds good to me.

[joecar]

This is what I have in my notes:



Cylinder Labels:
2 4 6 8
<-Front
1 3 5 7

Coil Labels:
D G E B
<-Front
A H F C

Injector Labels:
5 2 4 7
<-Front
8 1 3 6

Firing Sequence:
Cylinders: 1-8-7-2-6-5-4-3 (firing order)
Coils: A-B-C-D-E-F-G-H
Injectors: 8-7-6-5-4-3-2-1

[statesman]

So for the injectors, A-H = 8-1 ?

[Blue70SS]

Thanks for info joecar! The 8-1 for injectors seems odd, since the "individual injector correction" page shows letters. The correction factor starts at 1.0 and goes from 0 - 2, which looks like 2=100% more and 0 = 100% less.

So if the A-H = 8-1 holds true, to adjust by letter in the screenshot below - I would need to adjust B-D-E-G higher to compensate for bank 2 (2/4/6/8 cylinder #s)being leaner than bank 1?

18635

[joecar]

So for the injectors, A-H = 8-1 ?
Yes, injector # follows reverse firing order.

[joecar]

Implication is that injector # is different than cylinder #.

[wwaveforms]

Implication is that injector # is different than cylinder #.
I know this is an old thread but I have to be certain of this and the injector number being different is throwing me off. Which letter in b1520, the individual injector correction table, would I alter to affect cylinder 4 for example, E? I asked the same question of Paul of Efilive and he said that the leters follow the firing order, so cylinder 4 would be G. I have to get this right and am thoroughly confused.

[Blue70SS]

I know this is an old thread but I have to be certain of this and the injector number being different is throwing me off. Which letter in b1520, the individual injector correction table, would I alter to affect cylinder 4 for example, E? I asked the same question of Paul of Efilive and he said that the leters follow the firing order, so cylinder 4 would be G. I have to get this right and am thoroughly confused.

1A, 2D, 3H, 4G, 5F, 6E, 7C, 8B or in firing order..... A1, B8, C7, D2, E6, F5, G4, H3. Although, I changed table B1520 drastically (small increments at 1st) and couldn't see a difference between my dual AFR sensor readings. I changed Bank 2 (cylinders B D E G in tune) from 1.0 to 2.0 with no obvious change in datalogs.

[auspeed]

Where you able to balance the banks out by modding Table {B1520} ?

[auspeed]

???????

[wwaveforms]

???????

No, altering that table didn't make any difference. I zeroed out half of cylinders with no effect. It must no be active with my OS. I picked up some ID1000s I'll be trying next spring.

[Blue70SS]

Where you able to balance the banks out by modding Table {B1520} ?

I didn't see any changes by modding the table. Wondered if I was missing something.....

[auspeed]

I didn't see any changes by modding the table. Wondered if I was missing something.....

That's a shame, its would be useful for LSA's that run slightly leaner on the rear 2 cyls.

[Highlander]

for B1520 to be enabled there is a separate enable/disable bit that enables it. Not currently mapped.

[Tre-Cool]

I was reading on the hpt forum that some people who had tried it on the e38's were getting like a cut out around 4k rpm when they used it.

something to do with the cpu maxing out, e67 apparently doesn't have that problem.

[Highlander]

I’ve only tested on the bench woth an e67.

This looked like the best place to scale correctly larger injectors.