Disassembled Motor - Piston Carnage Pics
Joined: Jul 2007
Posts: 1,045
Likes: 104
I spent about 1.5 hours with Jeremy today as I dropped off my motor/cylinder head for rebuild. Long story short, there are clear signs on my piston beyond the broken ring that show melting from detonation, even though the plug doesnt show signs of detonation. He suspects I have a fueling issue.
So, while this motor gets rebuilt, I'm going to dive down the rabbit hole of somehow troubleshooting/testing my fuel system without a motor in the car. Also, I'm going to probably switch out my EMS to something with failsafes for fuel pressure and voltage.
I current have a 255 walbro fuel pump with the SOS larger regulator thing in place with 1050x injectors on the stock 2006 returnless fuel system. Injectors only hit 80 some percent duty at 14psi so fueling was never a concern, however that was not in a track environment so I dont know if that would have an effect on the fueling when it comes to this or not.
Also we discussed the fact that my alternator recently died on track, causing all kinds of crazy voltage errors and it was way overcharging the battery.. so my AFR sensors, fuel pump and injectors all may have not had the proper voltage going to them causing a lean condition. Of course the alternator died at the end of a 130mph straight when I was at redline/full boost... so if this did happen, it wouldve only taken a second of leaning out to cause all this.
Any recommendations on fuel system changes I should make/check out?
So, while this motor gets rebuilt, I'm going to dive down the rabbit hole of somehow troubleshooting/testing my fuel system without a motor in the car. Also, I'm going to probably switch out my EMS to something with failsafes for fuel pressure and voltage.
I current have a 255 walbro fuel pump with the SOS larger regulator thing in place with 1050x injectors on the stock 2006 returnless fuel system. Injectors only hit 80 some percent duty at 14psi so fueling was never a concern, however that was not in a track environment so I dont know if that would have an effect on the fueling when it comes to this or not.
Also we discussed the fact that my alternator recently died on track, causing all kinds of crazy voltage errors and it was way overcharging the battery.. so my AFR sensors, fuel pump and injectors all may have not had the proper voltage going to them causing a lean condition. Of course the alternator died at the end of a 130mph straight when I was at redline/full boost... so if this did happen, it wouldve only taken a second of leaning out to cause all this.
Any recommendations on fuel system changes I should make/check out?
Thread Starter
Joined: Jun 2003
Posts: 2,140
Likes: 162
From: Johnstown, PA
Nope, stock wiring on the 255 pump. Also I AM using the PnP pigtail things with the 1050 injectors... perhaps a soldering hardwire is in my future.
Joined: Jul 2007
Posts: 1,045
Likes: 104
Joined: Aug 2012
Posts: 8,759
Likes: 1,861
Hardwire if done right is more reliable, especially in a track environment.
Joined: Aug 2016
Posts: 2,767
Likes: 234
From: In BOOST
Joined: Aug 2016
Posts: 2,767
Likes: 234
From: In BOOST
I spent about 1.5 hours with Jeremy today as I dropped off my motor/cylinder head for rebuild. Long story short, there are clear signs on my piston beyond the broken ring that show melting from detonation, even though the plug doesnt show signs of detonation. He suspects I have a fueling issue.
So, while this motor gets rebuilt, I'm going to dive down the rabbit hole of somehow troubleshooting/testing my fuel system without a motor in the car. Also, I'm going to probably switch out my EMS to something with failsafes for fuel pressure and voltage.
I current have a 255 walbro fuel pump with the SOS larger regulator thing in place with 1050x injectors on the stock 2006 returnless fuel system. Injectors only hit 80 some percent duty at 14psi so fueling was never a concern, however that was not in a track environment so I dont know if that would have an effect on the fueling when it comes to this or not.
Also we discussed the fact that my alternator recently died on track, causing all kinds of crazy voltage errors and it was way overcharging the battery.. so my AFR sensors, fuel pump and injectors all may have not had the proper voltage going to them causing a lean condition. Of course the alternator died at the end of a 130mph straight when I was at redline/full boost... so if this did happen, it wouldve only taken a second of leaning out to cause all this.
Any recommendations on fuel system changes I should make/check out?
So, while this motor gets rebuilt, I'm going to dive down the rabbit hole of somehow troubleshooting/testing my fuel system without a motor in the car. Also, I'm going to probably switch out my EMS to something with failsafes for fuel pressure and voltage.
I current have a 255 walbro fuel pump with the SOS larger regulator thing in place with 1050x injectors on the stock 2006 returnless fuel system. Injectors only hit 80 some percent duty at 14psi so fueling was never a concern, however that was not in a track environment so I dont know if that would have an effect on the fueling when it comes to this or not.
Also we discussed the fact that my alternator recently died on track, causing all kinds of crazy voltage errors and it was way overcharging the battery.. so my AFR sensors, fuel pump and injectors all may have not had the proper voltage going to them causing a lean condition. Of course the alternator died at the end of a 130mph straight when I was at redline/full boost... so if this did happen, it wouldve only taken a second of leaning out to cause all this.
Any recommendations on fuel system changes I should make/check out?
Joined: Aug 2016
Posts: 2,767
Likes: 234
From: In BOOST
Rather don't run the supplied flimsy injector pnp harnesses. Rather run solid state adapters (no loose wires) that create a more stable connection between the OEM injector harness and your ID's connectors.
Joined: Mar 2003
Posts: 6,507
Likes: 51
From: Sellersburg, IN
Glad Jeremy was able to pinpoint what the root cause seems to have been with the engine failures.
As far as fuel system changes, I'd definitely hardwire your injectors in and ditch the PNP clips. Changing to a return style fuel system may be a better option as well. The return less fuel systems seem to be too finicky and limited to their capabilities.
As far as fuel system changes, I'd definitely hardwire your injectors in and ditch the PNP clips. Changing to a return style fuel system may be a better option as well. The return less fuel systems seem to be too finicky and limited to their capabilities.