Engine differences 2.7 pre-facelift & Facelift models

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3RZ
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Wed Jan 16, 2008 8:32 am

The attached pictures shows the two different head and intake runner configurations for the pre-facelift (8 port) and the facelift (4 port) heads on the 2.7 Hiluxes, pre-facelift being from about 99-2002 and the facelift 2003-2005. From my research it looks like the 8 port head provides more torque low down and responds better to a gasflow and mild cams as well as having better fuel consumption. I am currently contemplating fitting an 8 port head to my 2004 model. Some of the other differences are the airflow meters, the pre-facelift models uses a MAF with the facelift models using a MAP sensor, valve timing and exhaust manifolds
4 port intake runner.jpg
8 port intake runner.jpg
The changes were done to comply with the California emmissions control standerds as can be seen from the extract below from the attached file
newfeatu.pdf
(70.76 KiB) Downloaded 241 times
NEW FEATURES
2RZ-FE AND 3RZ-FE ENGINE
1. Description
The generator has been changed from 70 A to 80 A for both engines.
On the California specification model, both engines comply with the LEV (Low Emission Vehicle) requirements.
The EGR (Exhaust Gas Recirculation) system has been discontinued for the 2RZ-FE engine.
2. LEV Compliance
General
To comply with the LEV requirements, the following changes have been made:
The shape of the intake port of the cylinder head has been changed.
Valve timing has been changed.
Along with the change in the shape of the intake port of the cylinder head, the intake manifold has been
changed.
A compact, 1-coil type IAC valve has been adopted.
An exhaust manifold made of stainless steel has been adopted.
WU-TWC (Warm Up Three-Way Catalytic Converter) is used.
Compact, fine-atomization, 12-hole type fuel injectors have been adopted.
The DIS (Direct Ignition System) that provides one ignition coil for every cylinder has been adopted.
Air-fuel ratio sensor is used.
Cylinder Head
A Siamese port configuration has been adopted for the intake port of the cylinder head.

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Family_Dog
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Wed Jan 16, 2008 5:09 pm

Willem,

Interesting! Many people have commented on the fact that there are changes between the two engine models in the past, but I have never known just what these differences were. Consensus always was that the pre-facelift models had better fuel economy than the later models. Thanks for the input!


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
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3RZ
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Wed Jan 16, 2008 9:20 pm

Eric, my pleasure, believe me it took many hours on the net to get this info

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Thu Jan 17, 2008 8:29 am

Thanks for the input Willem. Glad to see you finally made it here :wink:

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Fri Jan 18, 2008 12:45 pm

Thanks for the information!

I am looking for a pre-facelift D/C 4x4 2.7i with low km's! If you know of one or a "tentative" seller I can contact, please let me know. I am based in Cape Town but will be in Gauteng regurlarly untill March 2008 if needed to come and view.
regards
Jaco

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Mon Apr 07, 2008 12:06 am

The pre facelift one uses an air mass meter(on the aircleaner), it calculates the exact amount of air that enters the intake, whereas a map censor uses preprogramed information based on throtle input that is not always ideal.
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" I WOULD RATHER SIT ON THE TAILGATE OF MY HILUX WITH A BEER AND A CHOP, WATCHING A FIRE, THAN DINE IN THE BEST RESTAURANT IN TOWN "

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Mon Apr 07, 2008 10:30 am

Jaco wrote:Thanks for the information!

I am looking for a pre-facelift D/C 4x4 2.7i with low km's! If you know of one or a "tentative" seller I can contact, please let me know. I am based in Cape Town but will be in Gauteng regurlarly untill March 2008 if needed to come and view.
regards
Jaco

You're looking for something as scarce as hen's teeth! My pre f/l 2.7i (White Fang) turned 46,000 this last weekend in Sani, but she's not for sale!

Still have to do the final calculations, but on our way to Sani at an average true GPS speed of 110 - 120 Kms, we experienced 8.3 km per litre. Three adults and light luggage.


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Wil net weet wat bedoel jy by lae kilos? Sover ek weet tel kilos nie teen 'n Hilux nie :lol: :lol: :lol: :lol: :mrgreen:

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Thu Jul 03, 2008 10:59 pm

@ Hoppy. Die mass flow air meter is dalk meer akuraat maar die Map (Manifold absolute pressure) sensor is baie meer robust en baie goedkoper om te vervang en sal nie sommer in die middel van Afrika probleme gee nie. Met `n MAP sensor lees die rekenaar van die kar die vakuum in die manifold en bepaal volgens die vakuum waarde hoeveel petrol die inspuiters moet lewer volgens `n geprogrameerde "fuel map" wat in die rekenaar gelaai is.
:thumbup:

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Fri Jul 04, 2008 7:59 pm

Jaws wrote:@ Hoppy. Die mass flow air meter is dalk meer akuraat maar die Map (Manifold absolute pressure) sensor is baie meer robust en baie goedkoper om te vervang en sal nie sommer in die middel van Afrika probleme gee nie. Met `n MAP sensor lees die rekenaar van die kar die vakuum in die manifold en bepaal volgens die vakuum waarde hoeveel petrol die inspuiters moet lewer volgens `n geprogrameerde "fuel map" wat in die rekenaar gelaai is.
Volgens Chris van Dicktator kan mens net die "air Mass net so akuraat bepaal deur na 'n kombinasie van Manifold Absolute Pressure en Intake Air Temparature gelyktydig te kyk as na 'n Mass Airflow Meter. As jy die air mass bepaal het bereken die EMS dan die korrekte injector timing om die mengsel reg te kry.

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Wed Sep 03, 2008 5:24 pm

Very interesting that the pre-facelift respond better to a new cam and head gasflow than the post-facelift. I am currently looking at changing the cams and gasflow the head on my 2.7 (2004) engine. Will ask the SAC guys about this.
1996 D/C Hilux Raider with 2.7i 3RZ Engine
2006 Land Cruiser 105 GX 4.2
170 Hornet Parachute 0-200 in 10 sec

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Thu Sep 04, 2008 2:50 am

Hi Anton

Welcome back

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Thu Sep 04, 2008 12:48 pm

Thanks Bennie
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Tue Sep 23, 2008 12:50 pm

UPDATE:

I picked up another difference between the 8 port/4 port pre-facelift/Faclift hiluxes while going through the part no's. I thought it was only the cam timing that was different but it looks like there are two different cams being used in the two models. The exhaust cam on all the 3RZ-FE enigines are the same Toyota part no 13502-75010, the cam sprocket is also the same Toyota part no 13523-75010. On the intake cams there are two part no's 13501-75030 and 13501-75040, the first one seems to have been used on the 8 port/pre-facelift models and the latter on the 4-port/Facelift models. I will be visiting my local Toyota dealer to try and confirm this and if this is the case I will be getting the 8 port intake cam for mine to try out. This could be one of the major reasons for the difference in fuel consumption.

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Wed Sep 24, 2008 10:07 pm

This will be interesting. Please keep us updated. You will solve many post face lift owners' problem if you can figure this one out.
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Thu Sep 25, 2008 9:27 am

Willem, excellent!

All this makes me even more determined to hold onto White Fang.

And to think that I once considered selling him!!! :o: :o: :o:

Hmmm... I should confess to this in the Sin Bin :confused:


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Thu Sep 25, 2008 7:03 pm

And for your punishment I think you must treat him to a Unichip :twisted: :twisted:

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Thu Sep 25, 2008 8:07 pm

White Fang don't need no new-fangled Unichip! :twisted:


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


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Thu Sep 25, 2008 8:13 pm

So what does need have to do with it?

Bulldog also did not need a locker or a new rear bumper :wink:

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Thu Sep 25, 2008 8:44 pm

BenHur wrote:So what does need have to do with it?

Bulldog also did not need a locker or a new rear bumper :wink:
But he's all the better for it! :)


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


Image

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Fri Sep 26, 2008 5:55 pm

So will White Fang be

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Fri Sep 26, 2008 7:01 pm

White Fang has a factory-installed locker :)

Such a pleasure being able to simply idle up a steep incline without revving one's engine to bits to do the same thing without a locker! Traction is the name of the game! :)


-F_D
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White Fang: 1999 2.7i DC Raider 4x4
Bull Dog: 1987 4Y-EFI 2.2 DC 4x4
Pra Dog: 1998 Prado VX 3.4
Hound Dog: 2000 2.7i SC 4x4


One Staffie, One Jack Russell, One Ring Neck Screecher, 17 Fish of questionable heritage


Image

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3RZ-EC
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Tue Feb 23, 2010 5:32 pm

Hi 3RZ,

Have you tried the intake cam on your facelift yet?

I have fitted the FT40 Perfect Power Fuel Tuner in December on my '05 2.7 D/C 2X4, not happy at all. The management picks up that there is something making changes and actually makes it a bit "richer"! :crazy:

Has anyone experienced something like this on their 2.7?

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Sun Dec 25, 2011 7:16 pm

There was a change in gearbox parts also. The prelifted firstgear was a problem, I try to explane in english, that was a bearing in a bearing combination. If you tell the problem up before a lot of damage you can just put the Cresida gearbox first gear in, if the damage had go to far you can overall gearbox and put the Cresida first gear in. Or you can get the Cresida box secondhand and just change the mainshafts for the transferbox to fit again. But dont overall the box and let the gays put the same 1st gear it will go again.

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ridwaan.bardien
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Fri Aug 31, 2012 3:02 pm

HI Guys

I'm sorry for picking up on a topic thats been arround since long, but I am so desperate to improve my bakkies performance on the incline.

3RZ (Willem Grimsell) you mentioned contemplating fitting an 8 port head to your 2004 model, have you done it yet?

Can you please share your experience?

Thanks

mplester
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Wed Sep 05, 2012 5:04 pm

Another reason why the pre face lift is lighter on fuel>
When changes were made on the inlet system the ECU was mapped to run hotter.
The head failure rate was higher than what TMC specified and it was noted that this was due to head temperature.
In order to cool the head flow rate was changed and fuel rate was increased. One would think that the extra fuel would increase the temperature but by overfueling the temperature in the combustion chamber became less.
Failure rate decreased. Off interest a micron of build up in the chamber will increase the Air to Boil by 1deg, this makes a lot of difference when towing the house behind

Darcor
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Thu Mar 28, 2013 7:36 am

Hey Willem,
Did you ever try the "other" Cam Shaft to see if Fuel Consumption changed in the Facelift 2.7?

Darren.

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