justin8018

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..

dannyz

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?

dnkynrbk

iTrader: (34)

You stock fuel pump may be taking a dump. +1 for what dannyz said.Need more info. PLUGS? TIMING?

justin8018

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

Ksths2

iTrader: (1)

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

ZOH SIX

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.

Z284U2TRY

iTrader: (5)

Did you hot wire the new pump?

justin8018

nope...

Johnv

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 ?

Hennytime

iTrader: (33)

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

justin8018

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

buddyleex

iTrader: (4)

Don't you risk detonation on a stock fuel pump with that big of a hit?

Noyzee

iTrader: (37)

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.

KFZ)^

iTrader: (1)

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.

Noyzee

iTrader: (37)

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

Z284U2TRY

iTrader: (5)

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?

Noyzee

iTrader: (37)

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!!