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Old 06-06-2013, 10:09 PM   #1
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Out of fuel paxton

Ok my buddy just switched to E85 on his 2012 Paxton stock pully with ID1000 injectors, long tube catless Hpipe boss intake and vortech BAP. Well the tuner is saying that he is running out of fuel at 5500 rpms. On gas he ran 609 on a dyno dynamics in 4th gear. He runs about 10 psi max also. Couple questions one why is he running 10 psi vs 8 and would running a JPC boost a pump fix the lean condition?
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Old 06-06-2013, 10:16 PM   #2
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Quote:
Originally Posted by Mweigt07
Ok my buddy just switched to E85 on his 2012 Paxton stock pully with ID1000 injectors, long tube catless Hpipe boss intake and vortech BAP. Well the tuner is saying that he is running out of fuel at 5500 rpms. On gas he ran 609 on a dyno dynamics in 4th gear. He runs about 10 psi max also. Couple questions one why is he running 10 psi vs 8 and would running a JPC boost a pump fix the lean condition?
That's in the tuning. He already has a BAP in the vortec, as you stated above. The tuner should know why if anyone. Does he have a CAI or running stock box, bc that takes the stock boost on a Paxton which is 7.5-8.5 up a 1lb or so.
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Old 06-06-2013, 10:23 PM   #3
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The vortech only goes to 18 volts (17.85) and the JMS would go to 21 I believe. The tuner said he is running out of fuel at 5500 rpms we tested the BAP works good might even swap it with mine to see if it goes a little higher. He is running a Cold air kit
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Old 06-06-2013, 10:26 PM   #4
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Shouldnt the custom tune have corrected the air fuel ratio?
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Old 06-06-2013, 10:29 PM   #5
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Quote:
Originally Posted by Mweigt07
The vortech only goes to 18 volts (17.85) and the JMS would go to 21 I believe. The tuner said he is running out of fuel at 5500 rpms we tested the BAP works good might even swap it with mine to see if it goes a little higher. He is running a Cold air kit
Makes sense volt wise but still shouldn't be the reason, he isn't putting down enough power for the pump to be cutting out. My stock pump without BAP does fine at 559whp. The cold air kit is what is putting him over the 8.5lbs. I wish i could help, just chimed in bc I have a Paxton as well and would like to know what's up. Tuner should be able to pinpoint it.

---------- Post added at 10:29 PM ---------- Previous post was at 10:27 PM ----------

Quote:
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Shouldnt the custom tune have corrected the air fuel ratio?
He's right, didn't see the lean part. That's all in the tune.
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Old 06-06-2013, 10:40 PM   #6
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Well the dyno dynamics dyno runs really low and it was a fourth gear pull we are thinking he might be around 680 or so on a dyno jet.
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Old 06-06-2013, 10:41 PM   #7
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Quote:
Originally Posted by Mweigt07
Well the dyno dynamics dyno runs really low and it was a fourth gear pull we are thinking he might be around 680 or so on a dyno jet.
MT or AT?
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Old 06-06-2013, 10:47 PM   #8
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MT

---------- Post added at 10:47 PM ---------- Previous post was at 10:44 PM ----------

That 609 was on 91 pump gas
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Old 06-06-2013, 10:47 PM   #9
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Originally Posted by Mweigt07
MT
Damn, she is making some power then. Dyno pull should be done in 5th. I did a 4th pull to prove to the dyno operator that he was wrong about the new 5.0s. 1:1 the closest in 5th, HP difference was about 40hp. Im anxious to see whats causing this!
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Old 06-06-2013, 10:58 PM   #10
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Is he running 91 or e85?
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Old 06-06-2013, 11:01 PM   #11
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Now he is data logging for E85
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Old 06-06-2013, 11:34 PM   #12
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The guy needs more fuel pump than what he has. Just because you have huge injectors and a BAP doesn't mean the fuel pump can keep up with the duty cycle. Not to mention you have to provide more fuel while using e85 just to begin with. My lightning has e85 and I use twin 255lph fuel pumps with a return style fore fuel hat, all stainless lines, Walbro regulator and #80 injectors to keep up with it at 18psi and E85.
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Old 06-06-2013, 11:37 PM   #13
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Originally Posted by ZLwhat
The guy needs more fuel pump than what he has. Just because you have huge injectors and a BAP doesn't mean the fuel pump can keep up with the duty cycle. Not to mention you have to provide more fuel while using e85 just to begin with. My lightning has e85 and I use twin 255lph fuel pumps with a return style fore fuel hat, all stainless lines, Walbro regulator and #80 injectors to keep up with it at 18psi and E85.
Nice answer! I didn't know that about E85, good look. Lighting has to be pretty sick too btw, always liked them!
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Old 06-06-2013, 11:45 PM   #14
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Originally Posted by JG5.0 View Post

Nice answer! I didn't know that about E85, good look. Lighting has to be pretty sick too btw, always liked them!
Not to derail the thread, but I LOVE the lightning. Put down 567rwhp about 3 months ago, and makes me smile everytime start it and smell that corn burning. Only bad thing is that it gets like 220 miles off of a full tank of E85 lol.

I would explore the fuel pump options and try running it in 5th gear. I'd say he will be sitting around 650rwhp the way she sits maybe more.
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Old 06-07-2013, 12:18 AM   #15
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Yeah that's a sick lighting, yeah the power has to be a little higher on gas with that being said the stock pump with a BAP is maxed out. What are some cheap alternatives besides a full fuel system upgrade( return style)? I know there is triple pump top hats that work with the stock fuel lines that are good for about 800 whp but he is leaning towards adding another tank and pump(s) just for E85 like a custom tank for the spare tire well. What inline pumps are capable supporting 700 whp on E85?
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Old 06-07-2013, 12:28 AM   #16
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[QUOTE="Mweigt07;1679574"]Yeah that's a sick lighting, yeah the power has to be a little higher on gas with that being said the s
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Old 06-07-2013, 01:13 AM   #17
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I have no idea why it screwed my post like that. Oh well, your buddy has a few options if he doesn't want to have a complete fuel system. Honestly, he needs to ditch the BAP and get a decent in tank set-up. I would never trust a wired in BAP on such an expensive investment and running out of fuel will destroy a motor in seconds. Lethal performance has a few options that you can use all the way up to complete systems with new rails and everything. I would either check there or call Walbro directly and ask them what they have available. I'd trust a Walbro pump any day of the week. My 98 4.6 has had a 255 Walbro for almost 120k and zero issues.
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