ls1greyhound

I am using the 60lb injectors/ data from the Greg Banish dvd. The car runs great and I am able to tune all the cells for the proper AFR except the low kpa cells that are only hit during deceleration. It doesn’t seem to matter how much fuel I pull out of the VE table. Anyone else encountered this issue? Is it just the nature of the larger injector?

ddnspider

iTrader: (26)

I have gregs injector data and use it on my 60#er's and I have no issues with going rich on decel. You sure you've got everything setup correctly? Are you using an adjustable FPR? If so where is it referenced? My car cleaned up alot when I referenced it to the intake manifold post throttlebody.

redtan

iTrader: (5)

Just the nature of the beast for the most part. When you're decelerating, the engine requires the absolute minimum amount of fuel to keep running while under very very little load. At the same time, a large injector like that can only spray so little fuel at its smallest setting.

If that minimum spray pattern is more fuel than required at those extreme small loads, your car is going to run rich.

Let me ask you this, how rich is "rich" in your book? 13s? 12s? 10s?

wesam

make sure the DFCO is enabled and is activate

NicD

iTrader: (7)

Or how about addressing the real issue of your minimum allowed pulsewidth value in the transient fueling section?

BLK02WS6

iTrader: (2)

Yep...

Ed Wright

iTrader: (1)

Also, many big cam cars don't have enough vacuum to enter DFCO. Often have to raise those values.

ls1greyhound

Thanks for all the help guys. Please explain this in a little more detail. I've looked at the transient section but I'm not sure exactly what table you are referring to.

ctd

iTrader: (1)

See if this gives you brain aneurysm I'm running LS9 injectors & have been wondering if this my lean tip in & rich decel issue. As NicD I've changed my min pulse width from my ID 1000 days which would affect idle & the decel but not my lean tip in. I need to re visit deem der values.

http://www.hptuners.com/forum/showthread.php?10872-Let-s-discuss-Transient-Fuel&highlight="Impact%20Gain%20Factor"

BLK02WS6

iTrader: (2)

Which software are you using?

ls1greyhound

I'm using hp tuners. I have no pressure regulator. I'm also 100% sure I entered all the data correctly. In the transient section I don't see anything pertaining to minimum pulse with. Although I did adjust the "min injector pulse" table to the values provided with the Banish DVD.

BLK02WS6

iTrader: (2)

Don't know what HPtuners calls it, but in EFILive, it is table B9021 "minimum transient pulsewidth" and it is only available in 512kb OS's and you have to install a .cax file to see it...

SladeX

Are you sure you are going rich? I have the opposite issue where its "lean" in those lower kpa readings and its adding fuel to the tune of 5% give or take, but since I'm decelerating its not so bad...

I'm also running 60lb injectors and just finished retuning the MAF on a dyno and wideband. Sub 2500rpm I'm running SD.

ls1greyhound

I'm not sure hp tuners has an equivalent table. Here is the transient section.

ls1greyhound

I'm not sure if it's relevant, but I'm running a 2 bar speed density tune with no MAF (turbo).

ls1greyhound

I'm positive I entered the data correctly (double checked it). I'm not using an FPR. I plan on running a boost reference FPR eventually. I was under the impression that the FPR only upped fuel pressure under boost and did nothing when the engine was in vacuum. Is that correct? Also, there is no negative side effects when it goes rich. Just wondering why I can't make it achieve commanded afr. It doesn't run rich in every cell while decelerating, just the very low kpa ones (30 and below).

ls1greyhound

This is kinda what I was thinking.

BLK02WS6

iTrader: (2)

It's not becuase of the size of the injector, it is in the tune - log the injector pulsewidth when it is running rich and see if it is sitting on 1.27 ms - that is the stock setting in the table. I don't know if HPTuners has the ability to change it or not... You may be stuck with it. I know on the 1MB PCMs, there is not way to access that table even with EFILive, and it sucks...

NicD

iTrader: (7)

Min fuel milligrams, just cut the table in half for now and its should make dialing in the low load / decel areas easy in the VE table. HP Tuners has it available in the editor for pretty much every cal.

brack86svo

Worked for me. I cut mine from 32 to 16 and it fixed my rich decal.