BOOSTAT4500

iTrader: (17)

I recentley installed a procharger and new injectors on an otherwise stock motor. I am using LS1edit to tune. I've got the car to idle and drive fine but WOT is way to rich. When I try to take fuel out in the P.E tables nothing seems to happen. What would cause this? Is there something else that has to be done first?

sross

iTrader: (1)

Maybe the COT? (Do a search if you don't know what it is)

ChrisB

How are you quantifying the effect of the fueling changes?

GrannySShifting

iTrader: (10)

Sounds liek COT to me

BOOSTAT4500

iTrader: (17)

We tried changing the COT, but it made no difference. For fueling we multiplied the stock flow rate by the increase in injector size. I went up to 50lbs.ers, the new number was around 7 I believe. 192% of stock.

ChrisB

No, I mean how are you determining if your PE changes are having an effect? Do you have a wideband, stock o2's, injectors pulsewidth, etc?

BOOSTAT4500

iTrader: (17)

We hook up a wideband O2 sensor, and it pegs at 9/1 so it might be even richer. And o2's are stock. Did we get the flow rate table right?

CAT3

iTrader: (9)

On the COT issue, you need to disable by answer false I believe rather than increase the temp number? Maybe wrong, but thats what I thought.

mikey

iTrader: (6)

Does you procharger have the Aeromotive boost pump that comes on only when you have boost? I re-wire those because with two different fuel pressures, it makes PT and WOT tuning a nightmare (can be done though). You basically have two different flow rates to deal with.

ChrisB

That sounds even rich for COT, but as was pointed out make sure it was set to false.

Mikey's suggestion sounds like it was dead on - I didn't know they were hooked up like that, but if they were that would definitely cause the problems you describe.

BOOSTAT4500

iTrader: (17)

We tried setting the COT to false but no change. The only fuel pump is the 255Lph intank pump, so no on the boost pump.

ChrisB

What are the values in your PE table and what are you changing them to?

L-EATER

iTrader: (2)

Your flow rate is way too high in my opinion based on my very limited expreience. I, too am going throught this after recently putting in some SVO 42's which are like 50lbs at the pressure I am running. I am a little rich and I have the IFR around 5.3 or so. I think 7 would be too far out of the ball park. Someone feel free to correct me.

BOOSTAT4500

iTrader: (17)

I went back to shop that is helping me with the initial tune and I was wrong about the flow rate. I can't remember the exact number, around 3.8 or so I belive, they used but the car idles and drives normal fine so I assume they got that right. I believe they used a flat percentage increase across the board, is this correct or do you have to give it a higher value at higher RPM? The stock P.E table number is 1.15. The problem is that when we tried changing this, nothing happened. I think they tried going all the way down to about .2. That's our biggest problem, lack of effect.

ChrisB

3.8 is wayyyy to low for the flow rate for SVO 42's @ LS1 fuel pressures (58 or so psi) - that would account for a tremendously rich condition - if you had the injector size set to large you would run initially lean (until/unless the o2's corrected).

The actual values depend on if you have a boost referenced fuel pressure regulator or not, 6.4-7 sounds like a much better ballpark

BOOSTAT4500

iTrader: (17)

Ok, if my flow rate table is set at 3.8 (to low)would the computer (o2's) be able to adjust enough at idle and part throttle to compensate but at WOT not enough? Does the computer end up still thinking the injectors aren't very big so it opens them up as much as possible when it goes into WOT mode? If this is the case do I just set the flow rate with a percentage across the board or do I need to adjust each part individually?

ChrisB

what are your l-trims like? At that flow rate they will probably be -25 - the bad injector flow rate can cause strange other problems also - I would get that corrected and then re-evaluate where you are at.


Are you running a pressure referenced fuel regulator?

BOOSTAT4500

iTrader: (17)

I am not running a pressure referenced regulator. What number would you recomend starting with? The math comes out to be about 6.9 I believe. Sound good? Do I put this number in the 0 kpa box only or should I run the same number throughout?

BOOSTAT4500

iTrader: (17)

Went back to shop today and tried the new Flow table numbers and she's finally alive!! They were definately too low. Now we just need to fine tune. Thanks for the help guys.

CurtD

iTrader: (7)

What numbers did you use?Did you run the same numbers throughout? Thanks.