Lexus 1UZ-FE Induction Testing inc dyno charts

[AM Racing]

Hi guys, thought I would put some charts up for the Lexus 1UZ-FE non VVT. I have been trying sort out the excessive fuel consumption on my 1UZ and have been experimenting with different intake systems and the effects different filter types has on power.
NOW, for the sake of this exercise these are the constants I stick to whenever doing back to back comparisons on this vehicle

1. Engine 1UZ-FE non vvt 2nd generation engine 10.4:1 compression ratio (round rail motor)
2. Power is measured at the wheels in kilowatts (kW) and torque in newton meters (Nm). If you want to know horse power, Google is your friend
3. Exhaust is stock headers with a 63/76mm progressive system with 2 resonator boxes and one silencer
4. Induction system comprises of a snorkel into a de-baffled D4D air filter box with a 100mm cone filter attached to the top. The stock 1UZ resonant chamer has been removed due to clearance issues, but I will elaborate on that later.
5. All tests are done on the same dyno with the same correction factors at sea level.

This comparison is by no means the definitive guide to 1UZ induction systems but merely what I have found on my vehicle and should it help you in your quest for more power help yourself.

Below is the base run with the de-baffled stock airbox and snorkel in place. Ignore the red line on the graph for now.
127kW & 272NM

6 With Existing cone in stock box.jpg (94.19 KiB) Viewed 3919 times

I unclipped the top part of the air, lifted it up and kept the cone filter in place
130kW & 270NM

1 Top lifted.jpg (115.37 KiB) Viewed 3919 times

You can see that there is a restriction in the system airbox base back. This is also evident in the leaner air fuel ratio's. Hence the drop in torque and increase in kW.


Next I removed the top of the air filter leaving only the rubber pipe in place
137kW & 282NM

2 Pipe only.jpg (108.16 KiB) Viewed 3919 times

You can see that there is a massive restriction in this section and I believe it is in 90 deg bend coming into the airbox.

So I got a bit curious. I heard that the stock resonant chamber that comes with these engines is best as it is a tuned chamber and will affect the resonant frequency of the induction system and affect power for the worst.
135kW & 281NM

3 with stock resonant chamber on.jpg (107.94 KiB) Viewed 3919 times

What I deduce from this is that it has a slightly negative affect on power albeit quite small. I'm of the opinion that this is tuned to cancel out a frequency that would otherwise make a noise in the stock induction system on the Lexus.

I then removed the chamber and did the run with no piping onto the throttle body.
140kW & 286NM That is a 13kW or a 10% loss in power due to the induction system.

4 Straight to throttle.jpg (112.62 KiB) Viewed 3919 times

SO, it appears I need to do something with this induction system to free up the power. BUT, you will notice that it only affects the power higher up. So it is clearly choking.

With the drift car in at the moment (also Lexus powered with a bump up in compression) I thought i would take its straight aluminium pipe with a cone filter on and try it.
140kW & 287NM

5 With straight pipe and cone filter.jpg (105.91 KiB) Viewed 3919 times

So a 1NM gain not anything to talk about BUT it does show the relative effectiveness of the cone filter and only really see it as a stone guard rather than an effective filter for a 4x4.

For interest sake I thoughtI would test the Donaldson type filter housing as found on the earlier Hilux's
125kW & 268NM :wth:

7 With Donaldson type filter.jpg (115.48 KiB) Viewed 3919 times

And that is not connected to the snorkel so clearly the V8 is not liking that one.

So after that I refitted my air filter in its entirety and tuned the vehicle to try and compensate for the shortfall and ended up at
136kW & 287NM

dyno resize0.jpg (83.91 KiB) Viewed 3919 times

You would say that a 4kW loss is not bad BUT you must remember there was no tuning in between these comparison runs and as such there is still a shortfall in the induction system. Had I tuned with filter off this would affect the tune once everything was refitted.

My intention is to keep the snorkel and build a filter system that will effectively filter while not starving the engine of the air that it needs. There will be more to follow as I carry on with this.

[Hoppy]

Thanks, very interesting, i made similar runs myself, but i never record them.

[LouisZ]

Now That is interesting!!!

No :? w I have to rethink Scorpion's Induction System.

Always thought it is something serious to look at.

[Agteros]

Very informative post Dylan!

[Gunta]

Nice one

[Hangover]

What management are you running?? Very Interesting!! Lekker as mens n dyno het om mee rond te speel!!

[LouisZ]

Just Heard,

Hilux SFA(Scorpion's Bosbeer) done 128.7kW on the Dyna . That is on 35" Tyres. I post the Dyna sheet later Tonight.

[AM Racing]

Running Spitronics

[d4dfanwp]

gr8 stuff v8 nou weet ek wat om te doen waneer ek my lexus in sit sal pic's post sodra ek begin


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[WiJoSt]

Thanks, very interesting, i made similar runs myself, but i never record them.

Vertel bietjie meer. Ons sal jou woord vat sonder rekords of prentjies.