Power Pages: 1995 Toyota Supra Twin Turbo

Owner: Import Tuner
Dynamometer model: R&D Dyno Service Dynojet Chassis Dyno 248C

DYNO 1: Baseline
Air temperature @ 79 degrees Fahrenheit

Peak.HP 312.0
Peak.Tq 273.6

Baseline Horsepower: 312.0
Baseline Torque: 273.6 lb-ft

Pros
In last month's issue of Import Tuner we were able to increase the power output of our Supra twin turbo engine from a baseline output of 264.2 horsepower and 234.0 lb-ft of torque to 312.0 horsepower and 273.6 lb-ft of torque. With just a few simple bolt-ons (exhaust, downpipe and air filter) our power figures skyrocketed by 47.8 horsepower and 39.6 lb-ft of torque. With over 300 horsepower on tap now the Supra really moves with boost coming in much quicker than before. The best part of an 2JZ-GTTE engine is that this is just the tip of the iceberg of power production. There is still a ton of horsepower waiting to be unleashed under the hood.

Cons
The only drawback of the 2JZ-GTTE engine is the amount of horsepower produced is directly linked to how deep your pockets are. The 2JZ-GTTE engine is easily capable of producing well over 1000 horsepower but getting there is a whole another story. In this installment we further push the performance envelope and try pumping more power out of the Supra with the help of AEM performance goodies.

DYNO 2: AEM Cam Gears
Air temperature @ 79 degrees Fahrenheit

Peak.HP 317.5
Peak.Tq 291.3

2000 to 3500 HP: 0-1
2000 to 3500 TQ: 8-12

3500 to 5500 HP: 3-10
3500 to 5500 TQ: 9-17

5500 to Redline Hp: 2-10
5500 to Redline TQ: 2-7

Peak Horsepower: 317.5
Peak Torque: 291.3

Pros
After several discussions with the crew at AEM R&D we found that by installing a pair of cam gears we would be able to increase the power output of the engine. The AEM cam gears are a direct replacement issue of the stock gears. The AEM gears are constructed from billet aluminum and are hard anodized for reduced wear and increased durability. The two-piece gears allows for fine-tuning of cam orchestration. Fortunately for us the AEM crew were nice enough to install and set the gears for us. Having installed dozen of gear on Supra twin-turbos the crew already had a general idea of where to set them.

Cons
Installing cam gears are not for the mechanically challenged. Installing the gear wrong can lead to major valvetrain disaster and can cost thousands of dollars to fix. This should be left to the professionals to install.

Parts include
Cam gears, stickers and license plate frame.

Tools required for install
10-, 12- and 14mm wrenches, 10-, 12- and 14 mm sockets, ratchet, extensions and Allen keys.

Install time: 1 - 1.5 hour

DYNO 3: AEM EMS Air/fuel @ 11.8:1
Air temperature @ 79 degrees Fahrenheit

Peak.HP 326.9
Peak.Tq 302.1

2000 to 3500 HP: 4-14
2000 to 3500 TQ: 8-25

3500 to 5500 HP: 3-23
3500 to 5500 TQ: 9-22

5500 to Redline Hp: 8-15
5500 to Redline TQ: 3-13

Peak Horsepower: 326.8
Peak Torque: 298.5

Pros
For our next installment we elected to go with an AEM EMS system for the Supra. With the increased output we wanted to have complete control of fuel and ignition timing. The EMS unit also gives us complete control of boost but we left boost pressure stock to illustrate the increase of the system with just fuel and ignition tuning. The EMS unit modifies the factory mass airflow sensor set-up to speed density. This allowed us to remove the restrictive mass airflow sensor and replace it with a straight-through piece. Fortunately for us AEM sells an air filter kit for the Supra twin-turbo for the EMS set-up. The system is a direct plug and play system so all we had to do was remove the factory ECU and plug in the EMS unit and we were ready to go.

Cons
For maximum power production the EMS system needs to be fine-tuned on the dyno, which can cost a pretty penny. Although the program is fairly user friendly one wrong keystroke and the motor can easily go bye, bye. We tuned the EMS unit to run a rather safe 11.8:1 air/fuel ratio for pump gas.

Parts include
AEM intake, AEM EMS unit, EMS software, serial cable, instructions, stickers and license plate frame

Tools required for install:
10- and 12 mm sockets, 10- and 12 mm wrenches, ratchet, extensions, standard and Phillip screw drivers.

Install time: 1 hour

DYNO 4: AEM EMS Air/Fuel @ 12.5:1
Air temperature @ 79 degrees Fahrenheit

Peak.HP 341.3
Peak.Tq 318.9

2000 to 3500 HP: 1-7
2000 to 3500 TQ: 4-10

3500 to 5500 HP: 7-22
3500 to 5500 TQ: 10-21

5500 to Redline Hp: 10-15
5500 to Redline TQ: 7-20

Peak Horsepower: 341.3
Peak Torque: 318.4

Pros
One of the great features of the AEM EMS unit is that it is Windows operated so changing fuel and ignition programs is as easy of a few clicks of the mouse. However you do have the programmed ready to go to make this possible. We wanted more power so we elected to pump a couple of gallons of 100-octane unleaded gas into the Supra and retuning the air/fuel ratio to 12.5:1, a slightly leaner program

Cons
Whenever you push the performance envelope the tuning window is much smaller and the car must run a nearly perfect fuel and timing chart for maximum power output. Otherwise the engine can go up in smoke.

Install time: 1 hour

Conclusion
By just fine-tuning the cam gear, fuel and ignition maps we were able to generate an additional 29.3 horsepower and 47.0 lb-ft of torque to the wheels! I Guess its time to go V8 hunting.