2jzge --> na-t

i found this post in clubna-t.com this post was by bean, he did a great write up ...

Feel free to sticky this so others can add, this needs to be the start
of a "Come to Jesus" talk with NA owners so they know how to
turbocharge the mighty 2jz-ge. To any moderator: feel free to edit my
post and make it more concise and/or readable.


Hopefully, by being on this website, you understand the basics of the
2jz series of engines. In the United States, Toyota released
"technically" 2 versions of the 2jz motor, the GTE and the GE.... both
come standard with DOHC, 24valves, EFI, etc... what else can you expect
from Toyota?

The basic differences between the GE and GTE (not comparing either VVTI editions):
-Most obvious difference to anyone familiar with engines is the TURBOS. The GE has none, thats what the 'T' in GTE means.

-Another is the style of intake manifold, the GE has a manifold
developed for more torque development in the lower-part of the rpm band
vs the GTE's short runner type. The GE doesnt have more torque; its
just that it develops more than it would if it had a GTE-style intake
manifold. Hope you knew that.

-Compression, the GE runs a 10:1 compression ratio and the GTE runs a
8.5:1 compression ratio. The differences are obtained through a thicker
headgasket (.2mm for GE vs 1.6mm for GTE) and lower compression pistons
on the GTE. The higher compression allows the GE motor to make the most
of its power since it lacks turbos to begin with.

-Injectors and Airflow sensors, the GE runs 330cc top-feed high
impedance Denso-style injectors and uses a Karman Vortex air-metering
sensor to read how much air volume is being injested. The GTE runs
540cc side-feed low impedance injectors (though uses a resistor pak to
raise the impedance for the ECU's sake)... measured through a hotwire
MAF sensor. The GE's airflow restriction is around 450hp from the stock
AFM and the GTE is around 650-700hp depending on several factors.

-The heads are slightly different. Some say the GE flows better than
the GTE, though no concrete numbers have come from a flowbench to prove
it. The GTE motor has larger intake ports on the head whereas the GE
has larger exhaust ports on the head. You make your own decisions.

-The exhaust manifold and intake manifolds port spacing and studs are
completely different and will not work with one another unless some
machining is involved with the manifolds themselves. There are people
who have successfully grafted the upper part of the GTE intake manifold
onto the lower part of the GE manifold.

-The GE motor runs a distributor-based ignition system with spark plug
wires and a single coil. The GTE runs coil-on-plug ignition with
individual coils for every plug. The distributor gets in the way
somestimes of the turbo intake pipe

These are just motor differences, there are many little others such as oil squirters, oil feed/return lines, transmissions, etc.

Now onto Similarities:
Both the GE and GTE bottom ends are VERY strong. The only difference
being the pistons themselves. Thats right, the rods and crankshaft are
the SAME parts!!! The 2jz motor itself was DESIGNED to be turbocharged
from the beginning and is built VERY strongly from the factory. No one
yet knows the limits of a GE setup, though there are several 1000whp
setups on the GTE with the stock bottom-end. Dave H uses a GE motor and
ran a 9sec 1/4 mile time with the stock GE block ( a spare 220k mile
motor to be specific!)
All in all, it is very doubtful that you will need to build your motor
when designing a NA-T setup unless you're gunning for ridiculous
amounts of power. The stock cams are roughly the SAME.

There are a few things to keep in mind when deciding what you want to
do. The biggest decision RIGHT NOW is whether you want to build a DIY
kit or order a pre-built one from a reputable shop.

Going the DIY
is very rewarding and you will learn more about your engine than you
thought possible. I personally went this route TWICE on my first two
setups on my SC300. But I had the typical problems.
-The Price is a good bit cheaper. Face it, you can source your own
parts off ebay, used items off of SupraForums and Clublexus
classifieds, etc and probably build a kit for much cheaper IF you get
everything. This isnt always the case
-The installation is a bit more difficult since you're putting together
parts that werent necessarily designed for one another and may require
some fabrication
-Used parts dont last as long and a lot of times they just arent as
good of a quality as new stuff is (new stuff is ALWAYS coming out for
the GE car nowadays).

Buying a Kit
is much simpler and easier to follow. You will still learn a lot about
your motor if you install your kit yourself and still have the
oppurtunity to purchase some used parts if you can find good deals,
etc. Buying a kit you KNOW that it will work correctly if its a
reputable shop such as BoostLogic, Sound Performance, PHR, Dave H, etc.
People have already done them, posted their results and their problems
so you can be ready for it when its your turn. You can purchase a turbo
kit, fuel kit, aem kit, and be done with it and have a monster on your
hands. They literally come with everything you need... being from the
other side, I can tell you that this is an immense PLUS. It doesnt
quite sound like it... but having done it twice, this is the way I will
do it a 3rd time.

Parts in a Typical Basic NA-T kit (note this is not everything you need)
Turbo manifold (there are log and header types, headers flow for more power, but spool slower)
Wastegate (bigger you go, the more control you have and less chances for spikes and creep)
Downpipe (connects to your exhaust)
Intake pipe (connects from your turbo inlet to your filter or AFM)
Oil feed and drain lines (feed and drain oil to/from the turbo)
Turbocharger (large varieties of these, this is what makes boost!)

In the basic kit you usually run directly off the wastegate spring.
Most kits keep you running on the stock compression levels (10:1
remember?) in the first "stage" or two, until you get serious about
power anyways. This results in quicker spoolup and better off-boost
response but you cannot run as much boost without risking serious
damage to your motor.

-10:1 compression limits you to around 7-8psi without fiddling with
your ignition timing (stock timing has a big "spike" of advance around
4000-4500rpms that will cause detonation if running more than 8-9psi
and the base timing is not retarded 3-4 degrees)
-stock injectors will also limit you powerwise. I've seen several
setups make OVER 400whp on the stock fuel setup (upgraded fuel pump)
but its still best to upgrade them (and with a way to control them too
-- SAFC, emanage, MAP ECU, AEM standalone, etc)... generally I wouldnt
go over 350whp with the stock 330s.
-intercooler options, some kits come with some dont, most of the
lower-priced ones dont and you are left to fend for yourself in the
intercooler arena... you NEED one to run more than 5 or 6psi reliably

What you REALLY need for a well balanced kit
-strong turbo manifold, either a strong cast unit or a strong (IE 321
Stainless Steel) tubular header manifold... Dave H's manifold runs via
Weld Els and it is VERY strong and beefy. His manifold is more of a
hybrid, not really a log and not really a header.

-turbocharger to suit your powerband preferences (a later discussion
perhaps?). Most people go with a T04E or PTE style turbo that makes
around 400whp at 10psi of boost.

EDIT: Thanks for suprapunk pointing out something: If you are building
your own kit: Ensure that your exhaust turbine lines up with your
manifold
Like make sure its a T4 hotside and a T4 flange on the manifold, and
make sure you have the correct hotside outlet as well to mate to your
downpipe (v-band, on-center, etc)

-35mm wastegate, Tial or HKS brands are good stuff. Many kits are
running 38 and 40mm gates, which is fine, they cost more. Depending on
how much power you'll be making with your turbo, you need to decide
what to run unless a kit-maker already picks one.

-fuel and a method of controlling that fuel to supply enough for your
power needs. On more basic setups I recommend the Emanage blue.
Affordable and can tune your car very nicely. Most basic kits can make
good power with MKIII Supra Turbo injectors. They are also top feed
(but low impedance, need resistor box or inline resistors) and denso
style but flow 440cc instead of 330. The Lexus V8 AFM modification is
affordable and can make the 440s easily tunable with a simple fuel
controller.

-a FRONT MOUNT INTERCOOLER. Do it once, do it right. The sidemount jobs
cannot compare with the Front mounts other than being harder to see.
You can pick up good quality units off ebay for under $300 these days.

-A 3 inch downpipe and 3" exhaust system! At least 3 inches all the way
back if you can. Turbos need FLOW, give them a bigger exhaust and they
will spool faster and give you MORE POWER.

-GOOD spark plugs and good conditioned ignition system (get a new rotor
and cap for your distributor pronto!). NGK 3330s and NGK 6097s are both
great plugs, they are pregapped at .031 which is perfect for turbo
applications under 19-20psi of boost

-Oil feed/drain lines properly sized. Typical setup is -3 or -4 AN feed
with a -10 (no smaller) drain line. Garret turbos require much less oil
than most people think; and dumping high pressure (60psi+) oil into it
and then having a small return line blows the oil seals on the turbo
very quickly. You want NO flow resistance on the return line. You can
do this by having a BIG return line like a -10 or use a oil-line
restrictor (can pick them up at atpturbo.com). IF you buy a premade kit
that comes with a oil-line kit then don't fret, its already been tested
and setup with the turbo you'll be running from the kit.

Keep in MIND!!! That all of this is how to get power reliably
out of the MOTOR. The transmission and the rear end are completely
different subjects. Your stock clutch WILL NOT withstand more than
300whp and last for very long. Your stock transmission WILL NOT
WITHSTAND more than 400-450whp for very long and driven hard (your
mileage may vary).
Autos are very different from the stock 5-speeds. Do your research on driveline modifications!

Bigger Power!

Keep in MIND!!! That all of this is how to get power reliably out of
the MOTOR. The transmission and the rear end are completely different
subjects. Your stock clutch WILL NOT withstand more than 300whp and
last for very long. Your stock transmission WILL NOT WITHSTAND more
than 400-450whp for very long and driven hard (your mileage may vary).
Autos are very different from the stock 5-speeds. Do your research on driveline modifications!

In the bigger power arena, you need to bypass several obstacles. One
most notably being the stock ECU with regards to fuel metering. There
are only so many bandaids you can run before you run out of airflow
(even with the V8 AFM). This means by going to speed density!

Speed density is a completely different way of measuring the air intake
in the engine vs the mass-air system used in the stock GE.

The stock GE system uses Karman Vortex as its way of
measuring air. If you've ever taken apart your intake and see the
sensor itself, you'll see a waffle-style (or honeycomb) front on it.
What this does it cause small vortexes to form after the air enters the
system. The more air that enters, the more vortexes (and the larger
they get). The quantity and amplitude of these vortexes is measured by
a small speaker inside the housing. You can see it if you look
carefully. Do not damage the honeycomb up front, you will cause the
sensor to read bad.

Speed density uses two seperate sensors to measure how much air has entered the system.
-The first sensor is a pressure sensor that senses how much pressure or
vacuum is in the intake system. This is called the "MAP sensor" MAP is
short for "manifold absolute pressure". By absolute, this means TOTAL
pressure including atmospheric pressure (which is 1 BAR at sea level)
by the way. If someone has a 3 bar map sensor, it means it can read
29.4psi of pressure ABOVE atmospheric (14.7psi = 1 BAR). Obviously,
this is a little sensor, and causes no intake restrictions of ANY sort.
-The second sensor is an air temperature sensor. When air cools, it
becomes more dense, with more oxygen molecules. This sensor allows the
ECU to compensate with more fuel to keep a safe mixture when the
temperature rises or drops. It is called an IAT sensor - or "intake air
temperature" sensor. This sensor also causes no restriction.

Almost all aftermarket ECU solutions are Speed Density (also called
MAP-based) and this includes the AEM ECU. It can run via AFM, but its a
waste not to utilize the extra flow and control with MAP. The "MAP ECU"
is a piggyback solution for the stock ECU. Like the older VPC, it
translates a MAP-based signal into an AFM signal that the ECU can use
(and isnt any the wiser). Both the MAP ECU and AEM allow you to run
MUCH larger injectors.

Ok I'm running a speed density system, I am cool!
Not so fast! You need BIG fuel injectors for that too. Luckily, the
stock fuel rail is a top-feed unit, has an FPR plug on it that is right
around 1/4" NPT in size, and has a good enough internal diameter to
flow enough fuel for over 700whp. Boost Logic, SP, Titan, etc now offer
NA-T fuel systems that either use the stock rail or replace the whole
thing completely. These systems are generally customizable to the size
injectors you want and most use TWIN Walbro Fuel pumps. Nice eh?

After that, you will already need to be running a GOOD turbo header...
the cast jobs work well in the low-power arena, but with the big boys
its all about FLOW.... and cast units DONT
On the header setups, you will already be using a larger wastegate
(40mm+) and at least a 3" downpipe. A lot of companies will have a 4"
downpipe and midpipe combo to upgrade to if you're going to be making
big power (dont really need that unless you're hitting over 700-750hp).

A FRONT MOUNT INTERCOOLER!!! I'd laugh if someone tried this with a stock sidemount

A turbo that can flow the amount of air you want. Do some research,
because there is a HUGE turbo selection out there and new ones are
coming out all the time that offer better and faster spool, more flow
and power, and more extras ( like jet sounds from the ported shroud
housings hehehe )

At this point you MUST be running a thicker headgasket. Why? Because
you cannot make over 400-450whp reliably with the stock 10:1
compression. Stock SupraTTs come with 8.5:1 compression and can run
lots of boost from the factory. YOU can get to this point by running a
thicker headgasket. Your stock gasket is very thin... like .2mm vs the
GTE gasket which is 1.6. Do not worry about squish-volume problems too
much, since the primary source of compression drop on the 2jz-gte is
achieved by running a much thicker headgasket. 2.5mm will get you to
8.5:1 compression.

The only problem left is ignition, which can be solved by running lower
gap on your plugs and an HKS DLI. It boosts the ignition signal and
will allow you to still make spark at higher boost when it would
normally be "blown out" from the excessive pressure.

After this point, you can start tuning, running racegas and making BIG
power. The stock GE intake manifold (EGR delete please!) can flow over
800-850hp and there's no point in upgrading to a high-flow unit (such
as the DaveH unit) until you eclipse this point.

There are lots of little things this guide didnt have for big power,
which is detailed tuning instructions (get it tuned by a professional
if you dont know what you're doing!), and small tidbits you should
already know. (ie Beaded intercooler pipes, new gaskets for all
hardware, etc)

Please understand that this is just a basic blow by blow of how to
obtain power from this motor. If you can understand this so far, then
congradulations, you can probably handle the whole deal just fine.
Remember that you can always just purchase a kit from a reputable manufacturer and it will come with everything you need.

Give one of the good shops a call and tell them exactly what kind of
power you want with what kind of powerband (nothing too unrealistic
here k?) and they will give you an invoice or statement telling you
exactly what you need. They've answered these questions many times.

by no means am i claiming this as my own. and all the credits goes to BEAN.. here's a link to the actual post... it's such a good write up i'm posting it here due to our growing supra 's owner .. hopes this helps^^

http://forum.clubna-t.com/showthread.php?t=10

There should be an ammendment. GTE block has oil squirters, GE block has none. Although it can be drilled and tapped to receive them.
I will be doing this on my own GE block

pics ftw

Pics of my build or of the GE's lack of squirters?