Project: EFI SWAP What do I need to make it work?

[Stapl3]

When you swap in injectors, the wrong method is to use mafcomp. Nothing changed with the airflow.

Either the injectors don't flow exactly 630cc, or the fuel pressure gauge isn't damn exact, or most likely both.

Base fuel pressure, global %, and deadtime are the only 'knobs' to turn for setting up the injectors.

Without a wideband you're really stabbing in the dark and I wouldn't bother with the 630cc injectors, which by the way is some weird size I have never heard of in my 25+ years.

 

[NineThrityONE]

When you swap in injectors, the wrong method is to use mafcomp. Nothing changed with the airflow.

Either the injectors don't flow exactly 630cc, or the fuel pressure gauge isn't damn exact, or most likely both.

Base fuel pressure, global %, and deadtime are the only 'knobs' to turn for setting up the injectors.

Without a wideband you're really stabbing in the dark and I wouldn't bother with the 630cc injectors, which by the way is some weird size I have never heard of in my 25+ years.

I do have a wideband, as I mentioned its running around 14.7 in the short test drive. the wide band is pretty much the only way I have ever been able to tune this engine. the injectors are the best fit for this engine (from a porsche 997 turbo)

 

[Stapl3]

If in closed loop you could be 20% off and still have the ECU get the engine to output 14.7.

Post a datalog if you want to sort it out.

 

[NineThrityONE]

If in closed loop you could be 20% off and still have the ECU get the engine to output 14.7.

Post a datalog if you want to sort it out.

yeah, thats the problem, the ecmlink freezes when the engine starts! so I cant get a log.

 

[Stapl3]

Update the software.

ECMTuning, Inc.

 

[NineThrityONE]

heres the injectors im using

4cyl Flow matched Bosch EV14S 53mm 627cc/630cc injector

Flow matched motorsport high impedance 627cc injector according to EV14S length of 53mm. Perfected to use with Nuke Performance fuel systems for motorsports applications.

www.nukeperformance.com

https://www.injectorplanet.com/collections/porsche/products/bosch-0280158123-porsche-99760513201

and yes I did delete the resistor pack

one says 630cc the other 600cc

Update the software.

ECMTuning, Inc.

I did, their last update is 2023.

I just went and started it, let it idle, and once it warmed up, the idle a/f kept oscillating between 13.5 to 16

 

[steve]

While he's using DSMLink V2 (and can't really upgrade the ECU software) this isn't a DSM he's working on. So we can't apply DSM behavior to a lot of the troubleshooting.

The fact that it stops connecting when the car is running is a big indication that something critical is broken. I don't know if it's the ECU being too busy to process the data link or is there is yet another wiring issue that causes this.

 

[Stapl3]

You have to fix the freezing when running issue, that has to be really frustrating. Does it do it for both streaming and capturing?

 

[NineThrityONE]

You have to fix the freezing when running issue, that has to be really frustrating. Does it do it for both streaming and capturing?

yes it is a pain, havent had too much of a chance to dig into it but, I did notice that with the coils disconnected, the program wouldn't freeze with continuous cranking.

 

[NineThrityONE]

While he's using DSMLink V2 (and can't really upgrade the ECU software) this isn't a DSM he's working on. So we can't apply DSM behavior to a lot of the troubleshooting.

The fact that it stops connecting when the car is running is a big indication that something critical is broken. I don't know if it's the ECU being too busy to process the data link or is there is yet another wiring issue that causes this.

Well, one thing I just tried last night, I selected the evo3 ( i think) maf profile, and that seemed to help. No idle bounce, and now idling around 12 a/f

 

[NineThrityONE]

You have to fix the freezing when running issue, that has to be really frustrating. Does it do it for both streaming and capturing?

Hmmm, is there a difference? I just always click live stream.... I thought it was capturing automatically?

 

[Stapl3]

Capture saves the file automatically. Stream does not. My thought was maybe you could do a stream, then end it, then save as a file.