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Lean at WOT

Cory S

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I'd hate to accidentally get a tank of E85 if I was tuned for E70.
The point is, being "Tuned" for E70 will work on 85% as well. UNLESS your fueling was at the absolute edge of failing to maintain lambda already. STFT's will only change delivery by around 5% between 70 and 85%..... WELL within the designed range.
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Ruiner46

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Oh, I didn't know it was that close, I didn't do the math. 🙂

Yeah, 5% is no sweat, most tuners seem to consider 10% fuel trims to be acceptable on a fresh tune. Hell, I might experiment with some E70 on the E85 tune and see where things land.
 

Cory S

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Oh, I didn't know it was that close, I didn't do the math. 🙂

Yeah, 5% is no sweat, most tuners seem to consider 10% fuel trims to be acceptable on a fresh tune. Hell, I might experiment with some E70 on the E85 tune and see where things land.
Yep. log it, and you'll find that your STFT's will be pull fueling back by 4-5%, and your spark will still reach allowed cap. I can run 68-90% without an issue. If I get over 82%, I actually dilute it down to 72-75%.
 

xGarage5.0

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Hey everyone, wanted to come back on here with some additional info.

Injectors were flow tested and are fine.

We also tried tuning on 93, and car still goes lean at WOT with 30% more fuel on MAF curve.

Any other suggestions as to what I could check?

The car is scheduled to be taken into PBD in March but wanted to see if I could get a jump on it before then.
 

AZlb5.0

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Park it and let PBD go through it and see what they find. You don’t want to keep doing hard pulls, trying to figure out what’s wrong and in one of them pop your engine.
 

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Cory S

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Hey everyone, wanted to come back on here with some additional info.

Injectors were flow tested and are fine.

We also tried tuning on 93, and car still goes lean at WOT with 30% more fuel on MAF curve.

Any other suggestions as to what I could check?

The car is scheduled to be taken into PBD in March but wanted to see if I could get a jump on it before then.
Have you actually applied direct 12V to each pump in the basket with it out????? Even just using ONE Ti274 @ 13.5-13.8V would probably not cause the lean condition you are seeing. Test both pumps individually with direct 12V and make sure they even spin. It's possible the turbine impeller is not moving the fuel on one of them as well (slipping). (Not common).
 

Cory S

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Is this your FP at idle with vacuum for boost reference or without?
It is base FP @ idle as normal operation. So with vacuum reference connected yes.
 

Acmepwr

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It is base FP @ idle as normal operation. So with vacuum reference connected yes.
Thanks Cory. I just installed the Arcane Stage 2 kit on my car and am starting the tuning process now so was just curious where yours is set.
 

Acmepwr

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It is base FP @ idle as normal operation. So with vacuum reference connected yes.
One more question- did you opt to install an inline check valve after the filter??
 

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Cory S

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One more question- did you opt to install an inline check valve after the filter??
Nope. Because Ti267/274/285 pumps have check valves in them.
 

Acmepwr

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Nope. Because Ti267/274/285 pumps have check valves in them.
Yeah, I was curious as to why Juggernaut offers them when you order the kit but I'm assuming it applies to the 295 pumps which I believe are not internally checked like the others. Just seemed like added restriction...
 

Cory S

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Yeah, I was curious as to why Juggernaut offers them when you order the kit but I'm assuming it applies to the 295 pumps which I believe are not internally checked like the others. Just seemed like added restriction...
You’re correct. Exactly why I didn’t want to add any additional valves. :)
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