![]() | ~360 rwhp Stage VII+ ![]() ![]() (optimized for Netscape 4.x/IE 5.x) |
(Now with inline photos! - Click them to get enlargements!) |
Fuel System (EFI) Mods |
Modification |
Part No. |
Mod Info |
Performance Value |
Lucas/RC Engineering 555cc Injectors ![]() |
PL8M-550 |
Drop-in replacement for stock (440cc) fuel injectors. Used as part of the Lexus upgrade. Requires the cutting/soldering in of new harnesses since the OEM harness is for oval-plug injectors and RC's are rectangular plug (more common). All injectors blueprinted to 0.1% of each other, tested and cleaned. |
These injectors provide a 26% increase in fuel flow, a better spray pattern for smoother idling and more power, plus Lucas's patented disc metering system. The disc-type system is a generation beyond the standard pintle-type (Bosch, ND, etc.) and is self-cleaning. Also, unit is a durable 100% stainless steel. Can supply for max of 507.6 hp @ 80% duty cycle. |
Custom Fabricated Adjustable Fuel Pressure Regulator ![]() ![]() |
Based on |
Custom CNC-fabricated FPR using the generation two regulator from the '89 and up Supra Turbo. The gen-two is a lower profile design. CNC was based on a new part so that new seals were used throughout. Linear pressure rise of 1 psi boost to 1 psi fuel is retained. |
Allows custom adjustment of the fuel pressure from below to above stock. This is better than a riser-type since such a setup is flow-hindered by the stock FPR. This mod isn't usually necessary with a stock MkIII fuel system, but the addition of a high flow pump made it a good idea. |
Nippondenso High Volume Fuel Pump ![]() ![]() |
195130-1020 |
Drop-in replacement to stock fuel pump. Same pump used by HKS for their fuel pump upgrade. It's actually from the Japanese-market Mazda Cosmo (3-rotor RX-7). Flow Rate: 250 lph; 66 gph; 1.1 gpm |
When moving up to higher boost pressure levels, the stock pump cannot maintain adequate pressure throughout the entire rev-band. This limits the maximum amount of power the engine can produce. This pump can flow enough fuel for well into the 600hp range. |
Autometer Silicone-Filled Fuel Pressure Gauge ![]() ![]() |
AM5412 |
Fuel pressure gauge for mounting in engine bay to monitor pressure controlled by A-FPR and high-flow fuel pump above. Monitors from 0 to 100 psi. Silicone-filled for vibration resistance. 12mm/AN-4 adapter from Toyota (used for EFI cleaning). |
Allows fine-tuning of fuel pressure at idle to maintain stock driveability and characteristics. Tapped into cold-start injector banjo port with 12mm/AN-4 adapter to 45 degree AN-4 end to 18" stainless braided AN-4 line to AN-4/1/8 NPT adapter. Also got AN-4 aluminum flare cap to cap off fuel rail tie-in. |
Current Lexus Modification Settings
Fuel Pressure: 38 psi (at idle with vacuum line connected) Click here for Reg's writeup on the
7M-GTE TCCS, Lexus AFM Upgrade and Vf data interpretation
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n/a |
Replace stock AFM with Lexus LS400 AFM core but retain stock electronics. Install 550cc injectors. This provides a 25% increase in airflow and fuel delivery, but since they're balanced, the ECU won't know the difference. Has the overall effect of simply shifting up your power levels as well as shifting up the fuel cut limit and allowing you to run higher boost levels. |
Similar to bolting on a large Holley carb :-). System has been tested by other group members to a sustained 19.1 psi, although such high limits are not recommended for reliability's sake of internal engine components. I'm currently running a "high" level on my EVC of 1.1 bar (15 psi) and a "low" level of 0.68 bar (10 psi) with great results. |
Upgraded/Added Controller Mods |
Modification |
Part No. |
Mod Info |
Performance Value |
HKS EVC (Electronic Valve Controller) Pro (IV ATM) ![]() Click here for the install instructions: |
4503-RA006 (Pro/ATM) Installation Kit |
Cockpit controlled, electronic control valve with microprocessor precision actuation of the turbo wastegate. The ATM feature makes the system immune to altitude and pressure variations. The Pro features include using engine rpm and throttle position to further optimize the boost control. |
The EVC continuously delivers information to the wastegate instructing it to more-evenly regulate pressure during all load conditions. The microprocessor also allows the wastegate to get closer to the preset boost levels quicker, allowing for a sharper rise in boost pressure. Because of the sharper boost rise, it's typical for an EVC equipped vehicle to develop more horsepower soon than a vehicle equipped with a stock boost regulator or even a VBC. |
HKS TEMS Controller ![]() |
8638EC-11026L 4504-ST003 |
Replaces stock 2-button MA70 Supra TEMS contoller with fully lit 4-button setup |
Ability to lock in any of the three TEMS shock damping values and override TEMS computer |
GReddy/TRUST Turbo Timer ![]() Installation Notes: Click here for my timer research and simple fix for the "hiccup" |
P/N 375001 Harness TT 14-11 |
Allows car to idle down without the key in the ignition and the alarm fully armed. Has selectable times from 10 seconds to 10 minutes and 2 presets. Has safety/theft shutdown circuits for the emergency brake plus a tap into the ECU speedometer circuit to detect car motion. Also has an audible reminder warning if the e-brake is left up when the timer is engaged. |
The low rpm idling allows oil to continue to coat the turbo bearing surfaces and allow them to cool to a point below which "coking" occurs (over 330oF). I compared this timer directly to the HKS Turbo Timer IV and found that the GReddy timer was superior in form, fit and function. Also, it's one-quarter DIN size and included mounting hardware made it much easier to install with professional results. |
Additional Gauges |
Modification |
Part No. |
Mod Info |
Performance Value |
HKS Boost Gauge |
4081EC-90000X 4086XX-90000X |
Mechanical meter provides highly accurate manifold vacuum readings up to 30 in. hg. and manifold pressure readings up to 20 psi. Fully illuminated 2 1/8" gauge. |
More accurate reading of boost level directly from intake manifold plus higher maximum. Note that this gauge (as well as the HKS EGT gauge below) is now unavailable as Japanese gauges have all gone metric. |
HKS EGT (Exhaust Gas Temperature) Meter |
4091XX-90000X 4402-SA010 |
Quick response electronic meter provides accurate EGT readings from 400o and 2200o Fahrenheit. Fully illuminated 2 1/8" gauge. |
Allows you to more carefully monitor how rich/lean the engine is running via EGT measurement. Helps fine-tune the motor. 1450oF peak is normal with stock injectors up to fuel cut. 15-16 psi at 1350oF peak is good to shoot for. |
K&N Air/Fuel Ratio Monitor LED Display to A/F Ratio Scale: |
85-2439 |
This is the rectangular gauge without the replacement O2 sensor since it is tapped into the stock sensor at the diagnostic port (Ox). Helps to fine tune fuel pressure/AFM to keep car running at optimal A/F ratios. Can be used with gas, alcohol and propane engines. |
Utilizing a 10-LED array, allows dynamic monitoring of air/fuel ratio while driving without taking up too much space (like, for example with a Halmeter). When running high boost levels (i.e., anything approaching 1 bar), the richer the better, to prevent detonation. |
Jeff M. Vf Signal (EFI System) Monitor ![]() Click here for Jeff's webpage |
n/a |
Gauge created by Jeff Montigny to create a visual representation of the Vf signal output. The Vf output tells you how the ECU is trimming the fuel system (i.e., richening or leaning out) based on signals being received from the O2 sensor, AFM and coolant temp sensors, primarily. |
Lets you optimize and balance the Lexus AFM/550cc RC injector upgrade combination. This is the second generation gauge created per a request by Keith H. and myself to better match the layout of the stock gauge cluster. |
Suspension Upgrades |
Modification |
Part No. |
Mod Info |
Performance Value |
Eibach Pro-Kit Springs ![]() ![]() |
8211.140 |
Replaces stock springs with progressive rate replacements meeting German T.U.V. and
Ford Q1 quality control certification. Progressive windings assure comfort is not lost with the
gains in handling and control. Spring Rates (k value)
Rear: 126-257 lb/in (22-45 N/mm) |
Improves vehicle looks and performance.
Lowers the vehicle's center of gravity, reducing body roll in turns, dive under braking, squat
during acceleration and gives the car a more solid, secure feel at all times. Improves
weight transfer during launches for better traction. Average Lowering (inches) Rates Note: The initial windings are used to preload springs against the vehicle. End result is a 20-30% average increase over stock rates. |
Tokico Illumina II TEMS-Compatible Performance Shocks ![]()
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(front) EU3635 |
TEMS-Compatible replacement shocks with twin-tube low pressure nitrogen charged cells. Lifetime warranty to original purchaser. |
Will work better with the Eibach spring upgrade's higher spring rates. Ups all three TEMS positions to an approximately 30% stiffer comrpession/rebound setting. |
Suspension Techniques (ST) Anti-Sway Bar System ![]() |
52215 |
Replaces stock anti-roll bars with more robust versions designed to tighten up the amount of sway allowed in the vehicle. Includes new, larger diameter front and rear anti-sway bars, low deflection urethane bushings, complete mounting hardware, and instructions. |
Designed to minimize body roll (vehicle lean) when cornering, resulting in improved vehicle balance and handling. The system also reduces understeer or "plowing", yet does not affect ride quality. Includes manufacturer's Limited Lifetime Warranty. |
1998 MkIV Twin-Turbo Supra Wheels ![]() ![]() ![]() |
42611-1B050 |
Clearcoated aluminum lightweight 5-spoke wheels designed for the 1998 MkIV TT,
but looks just as good (and possibly better :-) on a MkIII Turbo.
17" x 8.0" (front) 17" x 9.5" (rear) Offset = 50mm (front and rear) (Note: '89 = 16" x 7.5" x 37mm offset) |
Increases maximum cornering loads, steering response, braking ability, off-the-line
grip and overall handling through a decrease in unsprung weight while complementing the new look
offered by the above suspension mods.
23.6 lb / 25.4 lb ('98) - lighter w/o ctr ridges 24.75 lb / 26.55 lb ('93-'97) 21.0 lb / 21.0 lb ('89) (Note: '89 spare tire/wheel combo = 47 lb) |
Yokohama AVS S4-Z (V400) ![]() |
235/45ZR-17 |
Yokohama's latest top-of-the-line tire designs are grouped into the AVS (Advanced Vehicle System) series. The S4-Z tires combine the best aspects of the all-out pure high-performance tires with a small degree of all-weather practicality. |
By lowering aspect ratio and increasing the width of the contact patch, higher cornering loads can be achieved, improved braking distances, and greater overall traction. The only downside is a slight increase in rolling resistance. Note: Tires were balanced using full alloy balancing instead of the more common static method. Alloy balancing uses weighted adhesive pads on the inside of the wheel instead of the hammered on weights which can damage the finish |
Cusco/GREX Front Shock Tower Bar ![]() ![]() |
481006 |
Connects front shock towers using an adjustable aluminum alloy brace. |
Helps to eliminate front body flex and camber change under hard cornering ![]() ![]() |
JIC (Total Suspension Project) Front Lower-Arm Bar ![]() ![]() ![]()
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#70 chassis |
Rigidly connects front lower A-arms via a polished aluminum alloy brace. |
Helps to eliminate lateral load transfer and unnecessary suspension movement due
to flexing under hard cornering. Improves handling response, high speed stability and body
rigidity. |
Do-Luck (RXB) Center Support Bar ![]() ![]() Click here for PacNW/SOGI Click here for personal instl instructions
Click here for the English install instructions: Page 1 | Page 2
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90050 |
Ties the center of the unibody frame together using an adjustable, tubular
chrome plated steel brace. Connects via the large lower seat belt mounting bolts. It's
preloaded using a center adjustment bolt. ![]() |
Drastically stiffens up the weakest point in the unibody frame which helps to eliminate body flex under extreme loading. Increases torsional as well as overall structural rigidity. Note that the combination of a front, center and rear bar works to create an approximate 100% increase in structural rigidity. Only a rollcage helps further. Especially good for targa-equipped cars. |
Cusco/GREX Rear Shock Tower Bar (OS-Type) ![]() ![]()
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163 541 A |
Connects rear shock towers using a non-adjustable, polished aluminum
brace w/ steel stays-TEMS compatible. Shaft section is reinforced by an internal rib
for increased strength. |
Helps to eliminate rear body flex and camber change under hard cornering. Significantly strengthens the rear unibody hatchback frame which, by design, is weak due to the large hole in it. ![]() |
Powertrain Upgrades |
Brake System Upgrades |
Modification |
Part No. |
Mod Info |
Performance Value |
Porterfield Carbon/Kevlar Compound Brake Pads Porterfield High Temperature Backing Plates |
TP-336/337 TP-BQ111/171 |
Replaces stock pads and shims with carbon-kevlar R-4S compound replacements. |
Higher maximum brake force with much higher fade resistance. Good cold weather performance. |
TRD Braided Stainless Steel Brake Lines ![]() ![]() ![]() |
00602-47300-011 |
Replaces stock rubber lines with OEM quality fit. No fabrication, spacers or adapters necessary. Exceeds DOT requirements. Note that a difference in braking feel will be noticed. |
Increased brake system response due to less hydraulic induced expansion of the lines. Enhanced ABS system control. Great looking, more reliable. |
Motul Racing Brake Fluid 600 ![]() Dry Boiling Point: 585oF (307oC) Click here for a complete technical spec sheet |
TP-600C |
The ultimate high performance polyglycol-based brake fluid. With a DOT 4 rating derived from simply its viscosity being slightly higher than a DOT 3 standard, it far exceeds the boiling point standards of DOT 3/4/5/5.1. Compatible with DOT 3/4/5.1 fluids. |
Extremely high dry and wet boiling temps and resistance to moisture-induced performance degradation as well as the extreme scenario of vapor lock. The package is filled with nitrogen to increase shelf life and eliminate contamination while factory sealed. Note that the brake system should be completely flushed and bled with Motul 600 to get the maximum benefits. |
Miscellaneous Upgrades (Lighting, Horns, etc.) |
Modification |
Part No. |
Mod Info |
Performance Value |
Toyota Theft Deterrent System Enhancement (TDSE) |
08585-00861 00398-14910 |
Toyota annouced the release of the TDSE security system enhancement in July, 1991. The system adds the following features to the Factory Theft Deterrent System (TVSS): * Two Remote Transmitters* Glass Breakage Sensor * Horn Defeat * Car Finder * Remote Arming * Remote Door Locking |
Supplements the stock TVSS (Toyota Vehicle Security System) with a more robust shielding against potential thieves. The system is a virtual plug-in on all '91 and '92 Supras. Supras 86.5 to '90 require a minor modification to the power lock circuit harness since there was a minor change to that particular harness in 1991. |
Hella Vision Plus |
72207 |
Replaces standard H4 5¼" x 7¼" headlamp lens with the brightest, most powerful lighting available at the maximum legal limit, without increasing glare. SAE/DOT approved for US street use based on European headlamp technology. |
The maximum in lighting performance. The lamp's advanced optics provide a more uniform, controlled and even illumination on the road. The HVP produces a 50% more powerful beam on low beam and a 25% more powerful beam on high beam than standard halogen sealed beam units. The HVP is a two piece unit which allows usage of a hi-performance replaceable bulb to minimize waste and save money. |
PIAA Platinum Series Super White H4 Headlight Upgrade |
15680 |
SAE approved high-performance headlamp bulb upgrade. Super White technology approaches the brightness and intensity of a true HID system. With a Kelvin Rating of 3800K, the light color more closely imitates the color of natural sunlight (5250K). XTRA technology increases bulb performance and life. |
More than doubles the light output of the stock headlamp system (55W/60) while throwing a more pure white light. Combined with above lens upgrade provides a much better view of the road with greater clarity and detail. Xenon bulb creates 115W/135W from 80W of power draw. Click to see PIAA light spectrum comparison Click to see Super White vs. Normal Halogens |
CATZ/FET Gold-Iridium Foglight H3 HyperBulb Upgrade ![]() |
CB-90 MB-90 |
High performance foglight bulb upgrade. The Xenon charged bulb combined with double the standard filament thickness results in 130W of light from 85W of power. |
Effectively doubles the light output from the auxiliary foglight system. The electro-statically applied gold-iridium coating gives light beam an amber color which reduces glare and aids depth perception while increasing contrast and visibility. |
Hella Twin-Tone Compressor Air Horn Kit ![]() ![]() |
85105 3PB-003-001-791 |
Replaces stock electric horns with two air compressor powered trumpet horns for a more appealing sound. |
Sounds like a Porsche or Italian sports car horn. |
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Dry Film Lubrication Impregnation (MoS2) |
Thermal Barrier Coating |
Thermal/Oil Dispersant Coating |
CermaChrome |
Zirconium Thermal Barrier |
Satin Gray Header Coating |
Piston Skirts |
Exhaust Ports |
Underside of Piston |
HKS Intercooler Hard Pipe Upgrade |
Piston Domes |
Exhaust Manifold (outside) |
Pin Bores |
Intake Ports |
Coolant passages around chamber in head |
Lexus AFM Core |
Valve Faces |
Turbo Elbow (with add'l MCX high-temp liner) |
Ring Area |
Exhaust Manifold (inside) |
HKS Intercooler
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3-Main Heat Shields (with add'l MCX high-temp liner) |
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HKS 75mm exhaust system (with add'l MCS high-temp liner) |
Valve Stems/Seats |
Turbo Oil Return Tube |
Airdam screen (black to look like hole from a distance and corrosion resistance) |
Upper rad pipe fabricated to replace stock hose |
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HKS Downpipe (with add'l MCX high-temp liner) & (double coated for scrape protection) |
Rod Bearings |
Downpipe/Heat Shield Hardware |
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Custom fab'd I/C pipe from turbo compressor discharge to lower I/C hookup |
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Random Technologies SHF Cat (with add'l MCS high-temp liner) |
Main Bearings |
Oil Filter Housing |
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Turbo Elbow Metal Gasket (elbow to turbo seal) |
Thrust Bearings |
Coolant pipe going around block |
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Charcoal Canister Mount |
Cam Bearings |
Power steering mount |
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3-Turbo Rigidity (tie-down) Brackets |
Oil Pump Gears/Plates/Passages |
Intake Manifold |
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Dipstick Tube |
Valve Springs |
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Cat support bracket and hardware |
Cam Followers |
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Exhaust Manifold Studs |
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Exhaust Manifold Screw-Lock Helicoils |
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Cam Cover Stainless Bolt Upgrades |
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Red Barron |
Viola Blue over Chrome |
Mercedes Silver |
Gloss Black |
Engine Block |
GREX shock tower bar mounts |
Cam Covers (outside) |
Oil Pan (outside) |
Bell Housing to Block pieces |
Keith's Stock TEMS Covers |
Cylinder Head (outside) |
Intake Plenum to Block Tie-Down |
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Intake Plenum |
Intake Manifold to Block bar |
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Alternator Mount |
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Engine Lift Hook (front) |
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