14 GT Paxton New P.B.

Gruca

Gruca

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Well, no track runs yet. Fighting a fueling issue up top around 7,700 during data logging. Putting it on the dyno next week so I can monitor fuel pressure during WOT pulls. Nothing can ever be easy...


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tones_RS3

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Gruca said:
Well, no track runs yet. Fighting a fueling issue up top around 7,700 during data logging. Putting it on the dyno next week so I can monitor fuel pressure during WOT pulls. Nothing can ever be easy...
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Good luck man.
 
Gruca

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So when you install your spark plugs during your engine build (or in general) make sure you don’t go overboard with the dialectic grease. I pulled my plugs and that shit was all over the ends that contact the coils. I just replaced them all and cleaned up the coil, no more going lean. My STFTs sit between 0.92 and 0.95 all the to 8,000 rpms during WOT pulls now.


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Gruca

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Load new tune and of course the WOT log didn’t come back okay...this time I started going lean at 7,400. POS car...


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TTUhouston

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Never as easy as it sounds huh. Is this with same setup as before still (wastegate at 10 psi, 3.33 pulley or something like that)? Any ideas on what is happening? Is your return system having issues or injector? Maybe some teflon stuck somewhere in system(regulator or injector)?

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TTUhouston

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Also, is it your stft going to like 1.2 or afr or what do you mean going lean?

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Gruca

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TTUhouston said:
Never as easy as it sounds huh. Is this with same setup as before still (wastegate at 10 psi, 3.33 pulley or something like that)? Any ideas on what is happening? Is your return system having issues or injector? Maybe some teflon stuck somewhere in system(regulator or injector)?

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Yeah, same setup. Not entirely sure what the deal is at this point. Maybe a clog somewhere. Taking it to a dyno on Thursday to do WOT runs so I can monitor the fuel pressure regulator. If it works, I’ll take the injectors out to get tested and cleaned. Then I have no clue from there..


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Gruca

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Fixed a couple spark plug gaps and managed to get her to 7,800 without going lean.


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TTUhouston

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I think my problem is spark plug gaps too. May pm you, not an expert on this subject.

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Gruca

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Here’s what my fuel pressure does...


Here’s what it dyno’d (ignore the fact it says 2014 Mustang Cobra):
2R0AAHI.jpg
 
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Gruca

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Reaper14 said:
Looks great & lots of safe power. Good job!

V.C
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Dyno chart looks good, that fuel pressure at WOT does not though. I need to figure out why the fuel pressure drops to 50psi when it should be around 70. Lines aren’t kinked that I can see. The gas tank isn’t pinched them. I’ll have to pull the pumps and check the pre-filter in the tank.


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