Lexus 1UZFE Injector Upgrade

UPDATE: July 2, 2020 A limited supply of original Lextreme parts back in stock including EGR Delete Kits, torque converters, supercharger brackets, etc! Please note that the SC400 turbo kit is all sold out and won't return. Email me at [email protected] which original Lextreme parts you need and I'll check availability. (Please note that we're not an auto parts supplier.)

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Just want to share this with our visitors and members.  As if you are not familiar the Lexus injectors.  When I am saying 1UZFE, I am referring to Lexus from 1989 to 1997 and 1998-2000 would be different.  The Lexus LS400 got the gray colored tip injectors and they are rated at 220 cc/min. 

However, the SC400 or the Soarer got slightly little bigger injectors and they are rated 251 cc/min.  Both of the injectors are good for 6 psi of forced induction. 

However, if you want little more than 6 psi of boost, then you would need to get larger injectors.  The cheapest way to upgrade stock injectors is to get stock injectors from different cars.  What we discovered was that Toyota Supra from 1988 to 1992 with either the Yellow or Lime Green color tip would work pretty well. 

They have very similar impedance as our engine and almost the same plug.  The Yellow Tip was rated at 295 cc and the later years (lime green) was rated at 315 cc/min.  They are great for direct bolt on upgrade.  Remember, you will need to run a 10 ohm resistor for these injectors (7MGE-Yellow Tip).  They are low impedance.

Here are some articles of interest:
DIY Injector Upgrade
Type of Connector
Injector Upgrade
Mazda Injector Upgrade

After reading those articles now you should have a pretty good picture why and what you need.  In this article I would like to show you how to modify the Supra Yellow Tip to directly bolt on to the 1uzfe engine.

Here is a picture of the two connectors:

Side by Side comparison of two injectors and clip guide              

Here is a close up picture of the guide

You have to cut or grind these guides out in order for the stock clip to slide in.  Final product after cutting.

Here is how a stock 1uzfe (LS400) looks like.                            

Here is Supra Yellow Tip with 1uzfe clip.  

As you can see, the clip is directly bolt on and locking too.  This upgrade will give you few additional psi and idle should be fine.  The stock computer should able to compensate. 

If you need cleaning or balancing for any injectors, please contact Jim from The Injector Perfector and tell him Lextreme refer you.  If you find thing article interesting or helpful, please do not hesitate to support this site by clicking this link.

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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