LEATHL_WS6

Is there a limit as to how low I can scale the pe vs rpm table?

On the dyno with Air Fuel I'm at 11.5 for 5000 rpm and up. I have tried pulling fuel from 5k and up but everytime I pull fuel I make another run and its still 11.5. My settings are below 1 meaning they are 0.997 or whatever but lower than 1.0 I'm wondering if this is a valid entry for that field. I can't figure out why I can't tune that range. I am also noticing that I have to make huge changes to the table to see results. I will have to add or remove like 10% to see a .5 change in AFR. Any Ideas?

Thanks Rob

Black Blown 02

Do you have COT turned off?

Also, do your fuel trims lock at 0.0 when you go wot?

LEATHL_WS6

I have the rear o2 omitted completly. I don't run CATS. But COT was at 920 930 940 and 1040 I raised them each by 100 and still had the same results. LTRMS are -3 to -5 befoer I go WOT then at WOT they go to 0. I've been pulling my hair out on this and can't figure it out. I managed to get it to 12.0 at 5 to 6k after 6 it drops fast and at 6200 its like 11.3. Just seems weird. And even in the lower rpm range why would have to add or pull so much to make a little change?

Thanks Rob

HumpinSS

iTrader: (1)

Just turn COT off completely

Red01Chevy

im going through the same thing you are and ive turned cot off let me kno if you figure it out ive had to leave it alone for a few days before i throw my laptop out the window

LEATHL_WS6

Humping where do i turn it off at I think it should already be turned off?

LEATHL_WS6

I found it its off

LEATHL_WS6

Red 01 what is your setup lets see if we have anything the same.

Heres mine

01 346 11:1
30 lb injectors
SLP LS6 MAF
Patriot Heads
231 237 cam TSP
HS Roller Rockers
Stock Length Pushrods
Heads have been milled .020 to get to 11:1

HumpinSS

iTrader: (1)

If your PE vs RPM table values are leaner than the OpenLoop F/A table the PCM will take the RICHEST value and use that overiding your PE table. You can either tune for it through the ve table or the open loop F/A table.

Black Blown 02

Since his open loop F/A table is probably at 1.00, then does that mean he needs to bring the pe/rpm back up above 1.0 to lean it out?

LEATHL_WS6

Where is this Open Loop table. Should I scale my IFR table so I can keep the PE vs RPM above 1.0 in all ranges?

Also let me throw in another loop for you guys. I am running 29 degrees of timing on 93 octane fuel. The motor has a CR of 11:1 I see no knock at all. Isn't that a little weird?

I often wonder if my computer is f'ed up.

Black Blown 02

Thats interesting, do you mean it takes the richest value in the openloop F/A table? Like a 1.3.

Black Blown 02

Fuel tab, fuel/air multiplier button.

HumpinSS

iTrader: (1)

It takes the richest value between the two table eg

PE=1.00
F/A=1.13

The PCM will take the F/A table and apply that in WOT or

PE 1.25
F/A 1.13

PCM will tAKE THE pe value


Sounds ike you scaled you IFR table which richened EVERYTHING up and now you are trying to get it back to where it needs to be

Black Blown 02

I've never even messed with this open loop table. I'd say if your fuel trims are in the negative range and not too negative, then you shouldn't need to change your IFR.

My pe/rpm are all in the 1.1xx-1.2xx range and are very responsive to changes, and very consistant. A 5% change to pe/rpm numbers gets me a 5% AFR change. Verified by an incar wideband.

LEATHL_WS6

I changed the IFR tabe when I put i the bigger injectors. Then I tuned with the MAF table to get the ltrims -. Maybe I moved the IFR table too much. I'm pulling up LS1 edit now to see where my Open loop table is. Can or should the open loop table be changed?

LEATHL_WS6

That would make sense none of my af mult table is below 1.070. I guess I'm going to put my maf ifr and pe table back to stock and go from there. What would be the correct amount to change the IFR table for 30lb svo injectors. Going from 28's?

HumpinSS

iTrader: (1)

I would find out the difference in % between the old and new and scale the table by the answer. That should at least get youin the ballpark

Black Blown 02

I wouldn't change the open loop table. I don't know anything about it though, so maybe someone else can chime in.

I wonder if you'd have better results if you changed your MAF table back to stock, then adjusted your IFR to get you desired LTRIMS? That's how I did it. My MAF table is stock, and it still has the screen.

Black Blown 02

Beat me to it.