stock injector limit

kozzman555

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Sep 8, 2009
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Ft. Benning, GA
hey whats up. ive got a 1jz twin turbo mkIII. im wondering what the stock fuel injector limit is as far as power goes (i.e. increasing boost). ive got a walbro 255 fuel pump installed already and would get a safc before messing with the boost levels. can i safely increase the turbo psi on my stock injectors? and if so, how much? thanks for any help
 

foreverpsycotic

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Jul 16, 2006
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Stock turbos will likely fail before you hit the limit of your injectors.
340ish whp is about the highest those injectors can take, or the highest I would trust them.
 

RockPaperSwoRD

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Jul 26, 2008
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get an aeromotive fpr if you dont already have. stock 1jz goes pig rich at about 5k. i wouldnt mess with an safc unless you have a wideband either. i wouldnt go anything over 17ish psi though the twins fail at higher boost levels
 

Dylan JZ

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Oct 18, 2007
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I run 17psi +/- on stock injectors with a Neo/WBO2, though its still a bad idea IMO. Especially when you have not only 440's but also 550's sitting around like I do.
 

kozzman555

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Sep 8, 2009
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Ft. Benning, GA
it seems i have diff people saying diff things. basically what i want to know is what do i need to do (other than buying a boost controller and fcd) to safely boost 17psi on my stock twins?
 

seoul4korea

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Nov 6, 2008
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RockPaperSwoRD;1428952 said:
get an aeromotive fpr if you dont already have. stock 1jz goes pig rich at about 5k. i wouldnt mess with an safc unless you have a wideband either. i wouldnt go anything over 17ish psi though the twins fail at higher boost levels

kozzman555;1429385 said:
it seems i have diff people saying diff things. basically what i want to know is what do i need to do (other than buying a boost controller and fcd) to safely boost 17psi on my stock twins?

They answered your question you just didn't read it all. Sure your Fuel pump is important but if your running stock injectors then that only leaves the Aeromotive FPR and/or a piggy back or standalone.