Street Heat.Indd
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BY THE NUMBERS The rx7.com Mazda has gained unprecedented sees the strip more than the street. This is not all ENGINE RP Street Ported 13B bragging rights in the tightly knit world of rotary together true. TRANSMISSION performance — and this stature has come quite “This car has always kept to the philosophy of Stock Mazda Five-Speed quickly. While Adam Saruwatari is the most well- remaining streetable. Even today we test drive, tune, TURBO known name in RX-7 circles, Ari Yallon, Chris Ott and joy ride and even occasionally race the car on the Modifi ed GReddy T78 Kit Rotary Performance have taken FD performance street. It has always been street registered, inspected BOOST 1.75 bar w/ GReddy PRofec B where Adam and A&L Racing couldn’t. Adam’s and runs quite smoothly in around-town situations,” NITROUS RX-7 ran 10.12, 10.15 and 10.17 on slicks in stock said Yallon. “No one ever expects the performance Nitrous Express driveline confi guration. The crew swapped to a contained beneath its red body. Having the original 75-horse Spool-up Kit G-Force gearbox and wet 9.63 at fi rst asking. The suspension and clean, not overly fl ashy, appearance, EXHAUST GReddy Downpipe, GReddy aftermarket transmission put Adam in the Outlaw the Mazda takes people by surprise. Being in Texas, Power Extreme Exhaust Class, but the beauty of the deal was a quick swap weekend racing attracts a lot of ‘red-necks’ who laugh INTAKE Custom Cold Air back to a Mazda gearbox and he was cleared for at and heckle the RX-7 as it ‘tries’ to race their V8s NIK FUEL takeoff in the Quick Class. and pumped-up pickup trucks. They don’t laugh for RP Competition Fuel Pump, Ari and Rotary Performance took their FD to 10.01 long, usually about half a pass. We’ve also frequently RP Large Secondary Injector Kit H on street tires, then merely swapped to slicks and crashed the parties of exotic car owners [and end up] ENGINE MANAGEMENT Haltech E6K blasted a 9.62 — all via the stock Mazda driveline. beating Vipers, ‘Vettes and even Ferraris.” C PULLEYS The rx7.com Mazda is street registered and RP Triple Race Pulley capable of prowlin’ the streets at will (as it did ROTOR TECH INTERCOOLERE for our photo shoot) but with the shop’s reputation Rotary Performance prepped the 13B rotary engine GReddy Front-Mount Air-To-Air riding along with the car, you’d think the red rocket for high-power output. The RP crew custom street IGNITION Jacobs Rotary Pro Pak, Rotary Ultra Coils (Leading), And Wires, NGK Racing Plugs, J&S Knock Sensor. CLUTCH R T Bönez Racing Clutch, Stock Flywheel E SUSPENSION Tokico Struts, Suspension Specialties Springs, Cusco CF Rear Strut Bar BRAKES W Bönez Brake Upgrade REAR END Stock Mazda w/ 4.3 Gears, The RX-7 is as at home in the burnout box as it is in the drive-thru at the local burger joint. KAAZO LSD, RP Custom Axles, RP Drag Launch Kit At the strip in street-class trim, the RX-7 flexes Mickey Thompson ET Streets wrapped around Weld Racing Aluma Stars. This combo nets 10.01-second e.t.s at 142mph. Slapping on some MT slicks nets 9.62-second, 144 mph performance. This is our kind of street car! P BY THE NUMBERS The 13B was built and tuned by Rotary Performance out of Garland, Texas. Chris Ott and crew performed a street port, added trick 3-mm apex seals and enlisted a GReddy turbo system to give the engine a hearty power curve...they like everything big in Texas. ported the rotors to its own secret specs. Porting a the mods, the Rotary Performance crew credits Performance has set max boost to 28 psi and called rotor housing is the equivalent of porting the head immaculate engine assembly as another major factor on a big air-to-air GReddy intercooler to cool the on a piston engine, and increasing the airflow into in the FD’s durability and consistency at the strip and charge air as it heads to the engine. A GReddy PRo- the engine increases the power potential of the its civilized nature on the street. fec B is in charge of regulating boost in conjunction motor. A set of special Rotary Performance 3-mm with a Type R wastegate. apex seals were added to keep the engine together GIVE ME BOOST under high-boost operation. The 13B runs a stock The Mazda’s original sequential twin-turbo con- NO FUELIN’ intake manifold that is fed by an upgraded rx7.com figuration has been altered to single turbo status. Rotary Performance attacked fuel enrichment with throttle body. A GReddy Power Extreme system is in The rotary engine is dutifully pressurized by a a set of upgraded 550cc main injectors and 1600cc charge of expediting the flow of exhaust gases while GReddy turbo upgrade package featuring the secondary injectors. RP custom fabricated the fuel rail a 94-mm tip provides a nice finishing touch. Beyond company’s race-proven T78 turbocharger. Rotary and added one of its high-flow, in-tank fuel pumps. BY THE NUMBERS A Haltech E6K engine management computer runs the show. The E6K system is very similar to the E6S series used on many of the quickest Diamond Stars but it offers double the microprocessor speed, an internal barometric pressure sensor, additional PWM outputs and updated software. The E6K has data- logging capability that allows the user to see data in real time to better facilitate accurate tuning sadjust- ments. As far as the act of programming is concerned, the Haltech system allows the manipulation of graphs in lieu of inputting numbers to key component because the firing cycle control fuel delvery or tune ignition timing maps. of a rotary is much more complex than that of a piston engine. A GReddy T78 turbo is har- nessed to 28 psi by a PRofec B boost controller and Type R wastegate. The turbo is MIST-A-FY part of a kit that comes com- plete with GReddy plumbing For extra thrust, a Nitrous Express and its trademark blue hoses. A GReddy air-to-air wet-manifold system has been plumbed intercooler is also part of the turbo system. into the works. The laughing gas has We have always liked the been jetted to a conservative 75 hp and, way this GReddy intake piece helps dress up the en- spec coils, Jacobs plug wires and NGK while its 36-percent oxygen content by HEY SPARKY gine bay while smoothing the flow of air into the tenacious On the ignition side, the Mazda runs racing plugs to keep the Wankel running weight adds power, the cooling effect of turbo rotary powerplant. a Jacobs Rotary Pro Pak, Jacobs race- efficiently at full song. The Pro Pak is a nitrous also comes in handy, especially A 75-hp Nitrous Express in the harsh summer heat that hits the wet-manifold system acts as a spool-up assist. Brought Lone Star State. online at launch, the nitrous creates extra “cylinder” The system is used as a spool-up pressure which leads to more exhaust gases which, assist that creates extra “cylinder” in turn, speeds the spool-up of the turbo. While this usage pressure. This leads to more exhaust is nothing new, it should be noted that CHris has the gases, which, in turn, speeds the spool- nitrous programmed, via up of the turbo. While this usage is the Haltech, to stay on until a whopping 22 psi. Ari has nothing new, it should be noted that a steering wheel-mounted override that can pump out Chris has the nitrous programmed to the funny fog for the entire run when activated. Yes, that stay on until a whopping 22 psi (most is a big bottle, but no, it is not a converted Scuba tank. systems turn off at 5 to 7 psi). There is BY THE NUMBERS a steering wheel-mounted override that, when activated, pumps out the funny fog for the entire run. PLEASE STAY TUNED Rotary Performance handled all the tuning and utilized its Dynojet chassis dyno to chart the progress. Many of the actual tuning runs were performed on the street. The Wankel is controlled by a Haltech E6K engine management computer. The E6K is very similar to the E6S series used on many of the quickest Diamond Stars, but it offers double the microprocessor speed, an internal baro- metric pressure sensor, additional PWM outputs and updated software. top to bottom The E6K has datalogging capabil- On Rotary Performance’s ity that allows the user to see data in Dynojet, the RX-7 pumped real time to better facilitate accurate out 561.7 hp and 421.3 lbs-ft of torque at the wheels. This tuning adjustments. As far as the act run was a turbo-only run. of programming is concerned, the With the funny fog, the 13B laid down 645.7 ponies and Haltech system allows the manipulation 470.5 lbs-ft of torque. The Nitrous Express wet-mani- of graphs in lieu of inputting numbers fold system is configured as a spool-up assist providing to control fuel delivery or tweak igni- nitrous until 22 psi. An override button allows Ari tion curve maps. Operating parameters to squeeze the Wankel for the entire pass when track can be tuned in 500-rpm increments conditions permit. up to 10,500 rpm. With the Haltech The Cusco rear strut tower system on the job, Chris has extracted bar adds to the stability of the RX-7, which helps the car some impressive power numbers from while blasting down the strip and powering up canyon the 13B.