I have an 84 & an 88
turbo, what are some mild to moderate upgrades/tuning I can do to
either
one of these engines? Granted they will still both be street cars so I would
like to
retain
durability, but a little more kick in the pants would be nice without breaking
the bank
I want to change my auto Supra, to a 5 speed. What will I need, and how do I do it?
Will I need a Metal Head Gasket with the 7MGTE? How do I fit one?
I have an 84 & an 88 turbo, what are some mild to
moderate upgrades/tuning I can do to
either one of these engines? Granted they will still
both be street cars so I would like to
retain durability, but a little more kick in the pants
would be nice without breaking the bank
I assume
both your cars are stock at the moment? As a start, try changing your fluids to
synthetic in both cars.
Upgrades for the 84:
You need
to free up some of the factory restrictions in the exhaust and intake. I don't
know if there are emissions standards where you live, so you may need to retain
your cats? Here in
Also you
can:
Replace
air filter with hi flow one
New headers, or a turbo if extra keen.
Port,
polish, 3-angle valve job
Camshafts
(not too aggressive to keep drivability)
Increase
fuel pressure
NOS
Front and
rear strut bars. Contact CelicaSupra.com
Upgrades for the 88:
You will
be able to get reasonable gains quite easily. Exhaust around 3" is a good
size. A drop in hi performance air filter in factory air box will do wonders as
well. With these mods done, the boost can safely be
raised on the turbo by a few psi. Cheapest way is to
shim the wastegate. Basically this is putting a few
washers in front of wastegate shaft so it needs more
tension to open it. Be careful not to add too many! Need an aftermarket boost
gauge to check what you are running.
More
expensive upgrades include:
Bigger
injectors e.g. 550cc used in conjunction with a larger AFM from Lexus V8 motor.
There are articles at SONIC site on this. Allows further
boost increase and raises fuel cut too :-)
Metal
head gasket torqued down to 70+ ft/lbs is a very good
idea. You could also just re torque your factory one if short of cash.
Other mods if you're extra keen:
Bigger
Turbo
Bigger
intercooler w/ 2.5" piping
P.S. You could do a 7MGTE conversion to your Mk2. Will be quicker than the 88T!
I want to change my auto Supra, to a 5-speed. What will I need, and how do I do it?
To
swap a W58 Manual transmission into an Auto Mk2:
Probably
easiest to obtain all the bits from a parts car, but you can certainly obtain
them all separately. I recommend going with the 7MGE clutch disc and pressure
plate as it will handle more power :-)
Parts
you will need:
W58
transmission with M series bell-housing and manual shifter
Clutch
release fork and bearing (should be with the W58 already)
5M/7M
GE series Flywheel (NOT 7MGTE which used a R154 transmission and different type
of clutch)
5M/7M
series clutch disc and pressure plate
Clutch
pedal
Brake
pedal (Auto one is too wide)
Clutch
master cylinder and lines
Clutch
slave cylinder and lines
Front
half of the 2 piece drive-shaft (manual piece is longer. From centre bearing
aft, its all the same)
Cross
member under tail end of transmission (need one from a manual car)
Pilot
bearing
NOTES:
The
hole in the floor needs to be cut slightly bigger for the manual shifter to
fit.
A
little bit of wiring has to be done:
Short out the neutral start switch for the automatic. The connector for the reverse
lights is different, Could make a sub harness by combining pieces from the auto
transmission harness and the manual one.
You
don’t need to switch the ECU. The differences are minor. The manual one has a
rev limiter. The Auto one has the neutral start switch. Cully from NZ Supras has checked this on the schematics for the ECU. Only
the JZ series Auto ECUs retard the timing on gear
change, not 5M or 7M :-)
The
Speedo drive gear is matched to the differential ratio. If your W58 was from a
car with a different rear end to your Auto, then the speedo
calibration will be incorrect. Options are either to change speedo
drive gear on the side of the W58, or change differential to match the W58.
MODEL
DIFFERENCES:
Speedo
cable may be too short. Consider swapping in a manual one to prevent breakage.
The
clutch master cylinder/pedal bolt holes in the firewall do exist, but you will
need to install the top bracket from a manual car that holds the clutch pedal.
The mounting block and holes for the top part of the bracket may not be there
and may need to be welded in from a manual car.
Jap/Aust RHD:
Dash is
on the same side as the speedo cable connector on the gearbox. Speedo
cable is too long. May need to be restrained, to prevent
contact with the exhaust.
The
mounting block and holes for the top part of the bracket are already there, no
welding required.
Will I
need a Metal Head Gasket with the 7MGTE? How do I fit one?
If you put on a MHG properly, your 7M will
not have any BHG problems. BUT, you WILL need the head, and possibly the block
resurfaced before fitting the MHG. You will not really know what size MHG to
get until the surfaces are prepared (if you want to keep compression the same).
If you don't have an almost mirror finish on the block/head surfaces, the MHG
will not seal properly.
WARNING: Don’t go to any old shop for
a job like this. Go to one that does this sort of thing all the time
specifically for metal head gaskets. Some shops will give you a finish that is
worse than it was before you took it in. Find out where the racers go in your
area :-)
However,
there is nothing wrong with the
If
you need a HG change, and want to fit a
A
MHG is a strong gasket for high boost, but it needs to be installed properly to
work at all. The
The
easy fix it to just retorque the head as it is,
assuming it does not already have a BHG.
How to retorque the 7MGTE head