Jared's 7 Second 3.2L Street Supra - Build Recipe
Jared Holt is a well known racer in Oklahoma that set out on a journey to have a streetable Supra that could compete at a 7-second level consistently in competition. It was important to Jared that the car could fit into street car classes at Imports vs Domestics World Cup Finals and Hot Rod Drag Week.
- Goal: Streetable 7 Second Car
- Tire: 275 Radial
- Fuel: Ethanol
Below you will find the parts list this car used to go 7.5@181mph and completed Drag Week with.
1. Engine Block
To consistently go 7's in a 3300lb Full Chassis Supra we knew it would probably take more than 1300hp through a TH400 automatic. Jared owned this car before we started working on it and was used to driving it around town like a normal car. It was important to him that he didnt lose any of that streetability getting it to the 7s. Fuel was also a concern as Jared wanted to be able to take advantage of having ethanol pumps at the gas stations in Oklahoma.
Usually a Supra being purpose bulit to compete at a 7 second level would have a filled or billet dry block for safety, but this would have required eliminating the cooling system from passing through the block. Doing this modification renders the car unstreetable, as it quickly overheats without coolant or water running through the block, which isn't a problem for drag-only cars that only need to be running for less than 20 seconds at a time. So we stayed with the factory cast block.
- Displacement: 3.2L
- Compression Ratio: 10.0:1
- Bore Diameter: 86.5mm (0.020" Over)
- Rod Length: 5.590" (Std)
- Rod: Aluminum
- Stroke: 90mm
- Billet Main Caps
We knew this car was going to need to live at high horsepower and rpm levels to compete at the 7 second range. So we started with our street series 10.0:1 3.2L Stroker RS1600 engine with billet main caps, our Real Street RS1600 heavy duty pistons, a brian crower 90mm stroker crank, and aluminum rods. The added displacement and increased compression ratio help bring the car up on the converter quicker.
Since this car needs to be able to compete round after round day after day at Hotrod Drag Week, we decided to get the Brian Crower 90mm stroker crank and R&R aluminum connecting rods with a smaller honda-sized rod journal to slow bearing speed and increase longevity. The smaller rod journal bore also allows R&R to make the rod beefier around the rod journal increasing its strength in that area.
Because this engine goes down the track in an RPM window near 10,000rpm, maintaining oil pressure through the traps can become challenging using the oem oil pump. So we decided to go with a PHR Dry Sump kit to keep the oil where the engine needs it.
| Fastener Material | Custom Age 625+ |
| Fastener Type | Stud |
| Sale note | Sale price is valid for the quantity in stock. |
| Bearing Category | Connecting Rod Bearings |
| Bearing Type | Race Bearing |
| Bearing Size | STD (Standard) |
| Note | Narrow, Doweled |
| Bearing Category | Connecting Rod Bearings |
| Bearing Type | Race Bearing |
| Bearing Size | HX (Extra Oil Clearance) |
| Note | Narrow, Doweled |
| Bearing Category | Main Bearings |
| Bearing Type | Race Bearing |
| Bearing Size | STD (Standard) |
| Bearing Category | Main Bearings |
| Bearing Type | Race Bearing |
| Bearing Size | HX (Extra Oil Clearance) |
| Rod Length | 5.590in / 142mm |
| Rod Material & Type | Billet Aluminum Solid Beam |
| Rod Bolt | 3/8 ARP L19 |
| Gram Weight | 517 g |
| Note | Requires 1.888in Honda Journal Crank |
| Fastener Material | Custom Age 625+ |
| Fastener Type | Stud |
| Stroke | 90mm Stroker |
| Crank Material | 4340 Billet Steel |
| Rod Journal | Honda 1.888in / 48mm |
| Product Weight | 58.6 lbs |
| Bore Diameter | 86.5mm (+0.020in Over) |
| Compression Ratio | 10.0:1 |
| Rod Length | 5.590in / 142mm |
| Stroke | 90mm Stroker |
| Pin | .866in x 2.500in x .250in |
| Head Gasket Bore Diameter | 87.3mm (+0.052in Over) |
| Head Gasket Thickness | 0.050in / 1.27mm |
| Head Gasket Material | Copper |
| Bearing Category | Thrust Washers |
| Bearing Type | Non-Race Bearing |
| Bearing Size | STD (Standard) |
| A/C and P/S | Yes |
| Weight | 6.9lbs |
| Outer Diameter | 6.780in |
| Shell Material | Aluminum |
| HUB Material | Steel |
2. Engine Head
This car has been through a few different heads throughout its life. This car currently has a very basic head on it. It is a stock unported 2jz head with Brian Crower stage 3+ cams and Ferrea valvetrain.
The intake manifold is made by Ross Machine and was chosen for the throttle body placement that allows the drivers side intercooler pipe to make a 90 degree turn straight down without having to go out to the passenger side headlight area (where the dry sump oiling system reservoir is now located).
| Cam Type | Intake & Exhaust |
| Cam Duration | 276/276 |
| Cam Lift | .405in/.405in (10.29mm/10.29mm) |
| Cam Gear Position | Intake & Exhaust |
| Color | Gold |
| Quantity | Pair |
| Valve Spring Type | Dual |
| Seat Pressure | 87lbs @ 34.00mm |
| Open Pressure | 195lbs @ 24.00mm |
| Coil Bind | 21.50mm |
| Max Lift | 12.50mm |
| Retainer Material | Titanium |
3. Drivetrain
The stock 6spd manual transmission was replaced with an automatic transmission to improve its consistency in drag racing. The transmission is a 3speed RPM TH400 Automatic with a ProTorque converter. A Driveshaft Shop aluminum driveshaft transmits the power to a Driveshaft Shop bolt in IRS Ford 9" rear end.
| Driveshaft Material | Aluminum |
| Differential Type | Helical/Torsen |
| For Transmission | TH400 |
| Rear End Gear | 3.90 |
4. Fuel System
The fuel system is composed of two sets of Injector Dynamics injectors being fed "One Ethanol" fuel from a Weldon 2345-A electric fuel pump. The two sets of injectors are ID2000's and ID1050x's. Fuel pressure is controlled by a Weldon fuel pressure regulator.
A Nitrous Express direct port nitrous kit was used to bring the car up to launch rpm on the torque converter quickly in competition. The nitrous currently stays on for the first 4 seconds of the run and then shuts off once the car is approaching the 1/8th mile.
| Injector CC | 1065cc |
| Impedance | High |
| Injector Harness | Plug and Pins |
| Injector Inlet Size | 14mm |
| Fuel Injector Height | 60mm |
| Est. Ethanol Rating | 702.9 HP |
| Est. Gasoline Rating | 1086.3 HP |
| Injector CC | 2225cc |
| Impedance | High |
| Injector Harness | Plug and Play |
| Injector Inlet Size | 14mm |
| Fuel Injector Height | 60mm |
| Est. Ethanol Rating | 1468.5 HP |
| Est. Gasoline Rating | 2269.5 HP |
| Fuel Pump LPH | 757 LPH @ 80 PSI @ 14 Volts |
| Fuel Pump Type | Inline |
| Fuel Pump Inlet | 12 AN ORB Female |
| Fuel Pump Outlet | 10 AN ORB Female |
| Color | Black |
| Fitment | Universal |
| Fuel Pressure Regulator Inlet | 2x 12 AN ORB Female |
| Fuel Pressure Regulator Outlet | 12 AN ORB Female |
| Fuel Pressure Regulator Color | Black/Clear |
| Fuel Pressure Range | 28-120 PSI |
| Fitment | Universal |
| Fuel Filter Microns | 10 |
| Fuel Filter Type | After Pump |
| Fuel Filter Material | Stainless Steel |
| E85 Compatible | Yes |
| Fuel Filter Inoutlet | 12 AN ORB Female |
| Fuel Filter Color | Black |
| Note | 5.5in length by 2.38in diameter |
| Fitment | Universal |
5. Turbo Setup
The class this car was built to compete in is called Street Fighter at Imports vs Domestics World Cup Finals. The class has an 83mm limit for compressor wheel inducer in an attempt to limit the amount of power in the class to keep it competitive. So we had Precision turbo make an 83mm version of their sportsman 8685 turbocharger. We decided that this frame of turbocharger would be better for Jared's street car goals than a pro-mod frame would have been.
Boost is controlled by a pair of Tial wastegates, and charge air is cooled by an ETS 6" air to air front mount intercooler.
| Compressor Housing | GT42 / Sportsman 5.0 / 3 5/8 V-Band |
| Compressor Wheel | 83mm Billet |
| Exhaust Wheel Exducer | 85mm |
| Center Cartridge | Ball Bearing |
| Turbine Housing | T4 Divided Twin Scroll V-Band 1.28 A/R |
| HP Range | 1400HP |
| Intercooler Style | Front Mount Air to Air Bar and Plate |
| Intercooler Core | 26.00in L 12.00in H 6.00in W |
| Intercooler Inlet/Outlet | 3.50in/3.50in |
| Intercooler Core Thickness | 6.00in |
| Wastegate Valve Size | 44mm |
| Wastegate Flange | MVR V-Band |
| Wastegate Spring Pressure | .2bar to 1.5bar (2.9 PSI to 21.76 PSI) |
| Color | Black |
| Fitment | Universal |
6. Engine Management System
A Motec M150 run's the engine program in this supra. The Motec controls boost and nitrous by speed, allowing the engine to make more power as the traction will allow for it. It also controls the trans break and bump box for precise launch control.
| Range | -20 to 150C / -4 to 302F |
| Thread size | 3/8in NPT Male |
| Connector | 2 Pin Male w/ Matching Plug and Pins |
| Sensor Body | Brass |
| Fitment | Universal |
| Range | -14.7 to 85.3 PSI / 0 to 7 Bar |
| Thread size | 1/8in NPT Male Sensor with Hose Barb Adapter and -4 AN Male Adapter |
| Connector | 3 Pin Delphi Male w/ Matching Plug and Pins |
| Sensor Body | Stainless Steel |
| Fitment | Universal |
| Fitment | Plug & Play |
| Injector Drivers | 8 |
| Coil Drivers | 8 |
| Features | Traction Control, Launch Control, Gear Change Ignition Cut, Drive by Wire, Knock, Variable Cam, Boost, Nitrous Control, Flex Fuel Input, Trans Brake |
7. Wheels & Tires
Because this car still uses stock style suspension, we had to use wheels and tires that would fit within the stock fenders without hitting the body or the suspension. We went with Weld Alumastars in black, and the tire of choice was the Mickey Thompson Pro 275 radial.
| Thread Size | M12 x 1.5 |
| Color | Chrome |
| Seat/Style | Shank Seat Nut |
| Open End Design | Yes |
| Quantity | Set of 5 |
| Size | 17x4.5 |
| Bolt Pattern | 5x4.5 / 114.3 |
| Offset | -13 |
| Backspace | 2.25 |
| Beadlock | No |
| Lug Nut Style | Shank |
| Color | Black Face Black Lip |
| Size | 15x10.0 |
| Bolt Pattern | 5x4.5 / 114.3 |
| Offset | +63.5 |
| Backspace | 8 |
| Beadlock | Black Single MT |
| Lug Nut Style | Shank |
| Color | Black Face Polished Lip |
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