Lexus V8 1UZFE Injectors and Upgrades

LEXUS 1UZFE MODS FORUMS - Post Questions Here For Quick Answers!



The stock Lexus SC400 and LS400 1UZFE injectors are top feed high impedance 13.8 ohm with 251 cc/min and estimated around 50.2 bhp each injector or 401.6 bhp total.  If you plan to have any type of forced induction like turbo, supercharged or NOS, larger injector will be needed. Stock injector is max out around 6-7 psi.  Anything higher than that will require larger injectors.  Upgrade to 440 cc/min will yield around 86.0 bhp each that is around 688 bhp total.

If you are thinking about getting the Supra MKIII Turbo injectors.  They are 440cc top feed, however, they are low impedance.  They would not work on our cars unless you do some modifications on the ignition system to change it to low impedance.  Therefore, you have two choices for upgrading fuel injectors in the 1UZFE engine.

1. The easiest way is to get the proper size injector for your setup in top feed and high impedance.

2. The cheapest way is to get the Supra 7MGTE injectors and modify your ignition driver.

If you want to know how many horse power is your injector good for.  Just use the injector size, usually its in cc/min. time 5.  That will give you bhp.  More Injector information  For Example:  Stock 1UZFE is 251 cc/min time 5 is about 50.2 bhp.  The injectors below are used, but clean, balanced with new O-Rings by injector professional.  They are guarantee to work.

OEM Injector Flow Rate Ohm Max bhp Boost Connector
1UZFE (dark green) 251 cc/min High 400 <7 psi Plug & Play
7MGE (yellow) 295 cc/min Low 472 8-10 psi Slight Modification
7MGE (lime green) 315 cc/min High 504 10-12 psi Plug & Play
7MGTE (black) 440 cc/min Low 704 15-18 psi Slight Modification
Mazda Rx 7 (More
Details
)
460 & 550 cc/min High 700 – 880 15-22 psi Plug and Play

Conversions

  • 500cc per minute is approximately equal to 49lbs per hour which is equal to approximately 100hp.
  • lbs/hour = cc per minute / 10.2
  • lbs per hour = HP / 2.04
  • cc per minute = lbs per hour x 10.2
  • cc per minute = HP x 5
  • HP = cc per minute / 5
  • HP = lbs per hour x 2.04

If you need further calculation on injector please visit RC Engineering

Do you have any questions? If so, please head over to the forums to get a quick answer or share your experience!

This is a freelance site with no support by huge companies.  I have been doing most of the R&D and technical write-ups by myself with my personal money and literally thousands of hours of my time.  I have taken extra steps to demonstrate in details how things are done.  Currently I am one of the few people doing Lexus V8 research and performance enhancement.  This effort comes from my personal love for this wonderful engine.  Most of the modifications are from trial and error. There's no cookbook for 1UZFE mods and its unknown territory for much of supercharger performance.  The parts, labor, web development and site hosting are 100% paid from my personal hobby money.  If you feel my efforts help you in any form, please do not hesitate to donate any amount of money to support this site. You have no idea how much I and the entire Lexus and Toyota community appreciate it!

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