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z06 goes Lean.... Very LEAN

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Old Apr 30, 2010 | 02:36 PM
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Default z06 goes Lean.... Very LEAN

2001 z06 car made 455rwhp and 405rwtq with 228 232 cam and afr 215 heads, and a ported fast 92,

any one know the Limitations of stock Fuel pump in a 2001 z06?

i was attempting to spray a 125 wet HSW plate off the rail, but the AFR went to like 15:1 and i only gained 50 hp, any one have any idea.... why?

im guessing maxing out the fuel pump, but i would have thought i would have been able to make a little more..
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Old Apr 30, 2010 | 05:53 PM
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Stock pump is good for 450-480ish rwhp.
I don't think you want to take any chances by spraying even a 50 shot till you upgrade your fuel system.
Did they hook up a fuel pressure gauge during the dyno run?
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Old Apr 30, 2010 | 07:29 PM
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From: SPRINGFIELD MISSOURI
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You stock fuel pump may be taking a dump. +1 for what dannyz said.Need more info. PLUGS? TIMING?
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Old May 3, 2010 | 07:39 AM
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28* but i have the lingenfelter box set to -7
i replaced the pump with a 255 in tank, that should take care of the trick.
plugs are tr55s but i have the br7efs and thoose are going in
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Old May 3, 2010 | 10:06 AM
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WOW this is almost the exact post i just did. Had the exact same problems, i put the LPE pump in tank and same problem still exist and i'm running BR7EF's gapped at .032" whats my deal? lol
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Old May 3, 2010 | 02:21 PM
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I have an 03 Z06 with a stock fuel system except for 60lb injectors. I am having no lean issues at all running a 100 shot wet kit (510 rwhp total) based on the wideband and the A/F during the dyno pulls.
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Old May 3, 2010 | 02:43 PM
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Did you hot wire the new pump?
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Old May 3, 2010 | 02:55 PM
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Originally Posted by Z284U2TRY
Did you hot wire the new pump?
nope...
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Old May 3, 2010 | 11:30 PM
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test your setup with the nitrous bottle closed, if the fuel solinoid is working properly it sould go ubber rich when kit actvates.

what size jets you running ?
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Old May 4, 2010 | 06:50 AM
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remember to remove the little schrader valve from the rail? I forgot to do that the first time I installed a kit but caught it
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Old May 5, 2010 | 02:10 PM
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Originally Posted by Hennytime
remember to remove the little schrader valve from the rail? I forgot to do that the first time I installed a kit but caught it
of course...

i tried testing the system without the nitrous line plugged in, and it really doesnt seem like it makes much of a differance when i spray the fuel or not, it's not like the car goes SUPER Rich.

i'm thinking maybe for some reason the fuel isnt spraying
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Old May 6, 2010 | 11:27 AM
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Don't you risk detonation on a stock fuel pump with that big of a hit?
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Old May 6, 2010 | 03:37 PM
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i disagree. my stock 2003 with bolt ons and a dry 125 shot makes about 500 to the tires. stock injectors on spray run at 116% duty cycle and its been like this for about 5 years.
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Old May 6, 2010 | 07:03 PM
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Originally Posted by Noyzee
i disagree. my stock 2003 with bolt ons and a dry 125 shot makes about 500 to the tires. stock injectors on spray run at 116% duty cycle and its been like this for about 5 years.
OK, that's cool, but I'm sure you are aware that anything beyond 100% duty cycle is impossible. It's like a 25 or 26 hour day; it just ain't gonna happen.
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Old May 6, 2010 | 10:43 PM
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Originally Posted by KFZ)^
OK, that's cool, but I'm sure you are aware that anything beyond 100% duty cycle is impossible. It's like a 25 or 26 hour day; it just ain't gonna happen.
if i saved my log i would show you. it was over 100 almost the entire run. i have about 4 people that will vouch for it. they saw it with there own eyes
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Old May 7, 2010 | 11:11 AM
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Once the Injector hits 100% it goes static so tell me if I am wrong even though it may read over 100% anything after 100% the Injector stays open?
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Old May 7, 2010 | 11:18 AM
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From: East Side Performance! mASShole
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oh im sure the injector was open. i know that duty cycle was over 100% i wish i saved to log. maybe when i get home i will check my lap top and see if i cant find it. 2 of my buddies where at the track with me and we started cracking up about it. could not believe it!!
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