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what could cause this .....

Old 04-30-16, 07:48 AM
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1jzpickup
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1jzpickup s362 on meth, what would cause the truck to run Lean @ wot after the 2nd run?? When it sits overnight I let her warm up to temps then the first 2 or 3 quick 3rd gear stabs @ wot she's fine (high 11's afr's) then next run snap meh she out of nowhere low 13's .... what you guys think could be the issue? This had happen everyday for the past week
Old 04-30-16, 07:52 AM
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Stock fpr and rails, 550cc injectors, I believe bosch 044 pump(haven't dropped tank to verify) , safc, full meth ....been running fine at 28lbs of boost for a year ...
Old 04-30-16, 08:49 AM
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what ecu are you using ?

what power on the wheels are you making without meth ?

and with meth ?
Old 04-30-16, 09:16 AM
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Originally Posted by gerrb
what ecu are you using ?

what power on the wheels are you making without meth ?

and with meth ?
Safc
380 at 19lbs
570ish

Could it be fpr or pump?

Last edited by 1jzpickup; 04-30-16 at 10:35 AM.
Old 04-30-16, 09:54 AM
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you don't have enough fuel...

you only have 550cc injectors . Even at 100% duty cycle that's 550rwhp ... and the other 200rwhp is supported only by your meth injection which wont be enough .\

you said you have SAFC but what ECU is it piggy backed with ?
Old 04-30-16, 10:36 AM
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Originally Posted by gerrb
you don't have enough fuel...

you only have 550cc injectors . Even at 100% duty cycle that's 550rwhp ... and the other 200rwhp is supported only by your meth injection which wont be enough .\

you said you have SAFC but what ECU is it piggy backed with ?
I meant 570rwhp not 7...if not mistaken mines ecu... bought it with it already so not 100% sure
Old 04-30-16, 10:46 AM
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I wired up a small 40 wet Shot for special occasions, and been using the fuel noid for extra fuel when not spraying to run a little more boost. It's when I try to run said 2 more lbs of boost, when the afr's go lean after the 2nd hit, if I back down the boost to where I don't need the fuel solenoid everything it's fine. Prior to this it was running fine on that setup for a long time...I changed the fuel solenoid already, microswitch and arming switch all new, I even tested the system after she starts running lean, by removing the line going in the intake nozzle and it does spray...
Old 04-30-16, 10:52 AM
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I was wondering if there's some sort of sensor in the intake tract that has taken a toll with the meth and fuel going through it and slowly giving up???
Old 04-30-16, 11:26 AM
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clogged / dirty injector(s) is my guess

take them out and get them cleaned / flow tested. It is cheap.
Old 04-30-16, 01:27 PM
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Originally Posted by gerrb
clogged / dirty injector(s) is my guess

take them out and get them cleaned / flow tested. It is cheap.
Funny you say that, I noticed the issue ocurring shortly after trying a bottle of lucas octane booster
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