1G Dsmlink Elevated Injector duty .... update

[SasaniFab]

Ok guys so im here at the shop, i ripped apart my fuel system and found nothing, swap 3 sets of injector and changed the fuel pump. At idle my injector duty is over 16% and hits 140% in boost. The stock motor did not have any issues and my fuel system wasnt touched. The motor is a 8.3:1 but i cant see how that would effect the problem. I attached a log so you can see what im talking about..... Im lost

 

[SasaniFab]

fuel pressure is rising 1:1

 

[biglady112]

Is the car leaning out? Are you not able to control the fuel ratio? You do I ow that that is just a calculation in dsmlink right? No real or magical figures to actuallyive and die by. We have been as high as 130% and still had great control over our fuel mixture.

With that said, something could be wrong with the setup or in the settings of the computer (tune). I will have to look another time as I am on my phone and cannot review the log. Don't get caught up on that number of the car is not having a true, mechanical issue.

 

[SasaniFab]

Is the car leaning out? Are you not able to control the fuel ratio? You do I ow that that is just a calculation in dsmlink right? No real or magical figures to actuallyive and die by. We have been as high as 130% and still had great control over our fuel mixture.

With that said, something could be wrong with the setup or in the settings of the computer (tune). I will have to look another time as I am on my phone and cannot review the log. Don't get caught up on that number of the car is not having a true, mechanical issue.

Look at what I found ...., appears to be the wire off the relay going to the black, white wire off the pump

 

[SasaniFab]

Hope this is it

 

[91talonts1]

The log looks good other than the idle switch and the IDC. Boostest is tracking the map where it should and you're hitting your target AFR good.

But remember me mentioning the fuel pump rewire in your other thread? It looks like you have other charging system efficiency issues.

There's points in there where your dropping well into the 12s for battery voltage at WOT. I see 12.3V @ only 5700rpm!!! It looks like it would've dropped into the 11s had you stayed in it. Your pump is not flowing anywhere near what it should at those voltages. I'm sure the low voltage is also affecting the injectors. Not saying this is the only cause but it definitely ain't helping

 

[SasaniFab]

The log looks good other than the idle switch and the IDC. Boostest is tracking the map where it should and you're hitting your target AFR good.

But remember me mentioning the fuel pump rewire in your other thread? It looks like you have other charging system efficiency issues.

There's points in there where your dropping well into the 12s for battery voltage at WOT. I see 12.3V @ only 5700rpm!!! It looks like it would've dropped into the 11s had you stayed in it. Your pump is not flowing anywhere near what it should at those voltages. I'm sure the low voltage is also affecting the injectors. Not saying this is the only cause but it definitely ain't helping

Take a look at this , wire from relay going to black/ white on pump harness

 

[91talonts1]

Yeah that's definitely not carrying much current.

 

[91talonts1]

The voltage in the log is measured at the ECU itself though if I'm not mistaken. So that should be voltage the whole system is seeing. Might be time for a new alternator?

 

[SasaniFab]

That was at night with high beams, fans and heater running , I had everything on to try to get some reaction from the system.... the alternator is new , relocated to the back. But the battery is small

 

[SasaniFab]

When I'm cruising and not deceleration to a stop I'm usually high 13s, also the charging system acted this way prior to my issue. I hope this was it . I'm crossing my fingers

 

[SasaniFab]

The voltage in the log is measured at the ECU itself though if I'm not mistaken. So that should be voltage the whole system is seeing. Might be time for a new alternator?

Took the car out, after repairing the wire, no change but I turned up the boost and the car hauls f***ing as. Had it at 25 psi..... car moves ....I'm just going to ignore it . My car wouldn't be running rich if I was out of injector

 

[gsxeclipse102]

Looked at your log. Couple things wrong. 1 your tuning with sd table and fuel tab. Pick one not both. At 415.109 secs your getting 2.1 deg of knock retard. Your actual rawknock count is prob through the roof. Your tune is off and causing the car to knock which is telling the ecu to use tge minoct tables. Your afrest is dropping to 10.4.

 

[boostdawd]

Double click on InjDuty and compare the settings to mine. At idle I'm around 2%.

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[SasaniFab]

Looked at your log. Couple things wrong. 1 your tuning with sd table and fuel tab. Pick one not both. At 415.109 secs your getting 2.1 deg of knock retard. Your actual rawknock count is prob through the roof. Your tune is off and causing the car to knock which is telling the ecu to use tge minoct tables. Your afrest is dropping to 10.4.

I normally don't use the fuel tab, just the Sd table, I think the knock is caused by my meth injection starting to flow. The car is on race gas also- I doubt I'm knocking at 20 psi.

 

[SasaniFab]

I could be wrong , but race gas on meth injection, that tune isn't very aggressive at least in my estimation. I'm not very knowledgeable when it comes to tuning so I might be just talking out of my ass

 

[gsxeclipse102]

Well you can doubt it but your knock sensor is picking something up. Knock retard should never be over .4 degrees. After you built your motor did you set base ignition timing correctly?

 

[SasaniFab]

Double click on InjDuty and compare the settings to mine. At idle I'm around 2%.

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That's exactly how it looks

 

[SasaniFab]

Well you can doubt it but your knock sensor is picking something up. Knock retard should never be over .4 degrees. After you built your motor did you set base ignition timing correctly?

I'm going to double check it .... like I said , I'm a tune boob so I'm sure your right

 

[gsxeclipse102]

Hey im no expert either. Lol

 

[GST with PSI]

Without more information, I can't really help you. Nobody can. There's a reason we're always bitching at people to use the ECMlink template. It provides critical information that will affect the overall tune. Without it, giving advice is useless.

Also, that log doesn't have a single good pull in the entire thing. Even if the car was leaning out up top, you wouldn't be able to tell from that log. Go log a legit 3rd gear pull.

I'd be willing to bet that 255 (if that's in fact the pump you're on) is working pretty hard. With proper fuel supply, the IDCs on 1650s will definitely not be over 100%. They DEFINITELY should not be over 100% on pump or race gas under 20 pounds of boost. Those are not getting enough fuel. It could a pump issue, or something else fuel related causing restricted pressure and/or flow.

Go start a new thread in the ECMlink tuning sub-forum and use the template provided.

 

[gsxeclipse102]

Without more information, I can't really help you. Nobody can. There's a reason we're always bitching at people to use the ECMlink template. It provides critical information that will affect the overall tune. Without it, giving advice is useless.

Also, that log doesn't have a single good pull in the entire thing. Even if the car was leaning out up top, you wouldn't be able to tell from that log. Go log a legit 3rd gear pull.

I'd be willing to bet that 255 (if that's in fact the pump you're on) is working pretty hard. With proper fuel supply, the IDCs on 1650s will definitely not be over 100%. They DEFINITELY should not be over 100% on pump or race gas under 20 pounds of boost. Those are not getting enough fuel. It could a pump issue, or something else fuel related causing restricted pressure and/or flow.

Go start a new thread in the ECMlink tuning sub-forum and use the template provided.

I believe hes on a walbro 450. If he actually was going lean wouldnt his wideband show it? Theres times hes in the 10's for an afr

 

[henrysan]

OP, Even with my headlights and heater on, I have never seen less than 13.5 volts WOT all the way to 7500 rpm. Possibly worth checking into.

My car has always registered .4 or .7 blips of knock retard during a WOT pull, with boost at 18 psi or 32 psi, 12 degrees peak or 18 degrees peak timing, and anywhere in between. I have Decided to only worry about the knock if it retards over 1 degree, which I never see with my current tune. Dont know how good or bad this is, but just sharing info.

 

[GST with PSI]

If he actually was going lean wouldn't his wideband show it? Theres times hes in the 10's for an afr

Your guess is as good as mine? Like I said, there's not a decent snip of data to gauge how the car is actually running that I saw. I did see the injector duty cycle over 100% more times than not, though.

For example, around 509.816 in his log:

-18.5psi
-28.3 lbs/min
-102.3% IDC on 1650s

There's obviously a problem here, whether it be with the tune, or a mechanical issue. Contrary to what @biglady112 would have you believe, the numbers being displayed by ECMlink actually mean things. To me it doesn't really matter what his AFR reads, something is dicked up. If he's on a Walbro 450 that's even more curious, as that pump should definitely support.

For comparison purposes, here are some numbers from my own car:

-26.5psi
-51.8lbs/min
-67.8 IDC on 1650s (and on E85)

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There's a problem, and if you ask me it has no bearing on whether or not his AFR is currently tracking true. That may be how some people tune, but certainly not me.

 

[gsxeclipse102]

I agree with you on a lot of stuff. The one thing i saw was a lot of knock retard. My understanding(please correct me if im wrong) is that after a lot of knock the car starts to use the minoctane table which is a much richer afr. This in turn would cause the injector duty to increase to try to richen up mixture and stop knocking. I was thinking maybe the knock is from high timing (base setting being off) also high airflowperrev at idle meaning the whole sd table is off