George M built his Vortech-supercharged G35 coupe to participate in Hill Climb events while remaining an adept street car.  To ensure he could come back down the mountain we upgraded his brakes with a Stoptech big-brake kit:

 

Up front, the OEM Brembo calipers and rotors were replaced with Stoptech’s 380mm rotors 6-piston calipers:

At the rear, 355mm rotors and ST22 calipers. Note how everything still fit nicely behind the factory wheels:

 

Stay tuned as George will visit us later for power upgrades including a new MAF/injectors followed by dyno tuning.

 

Raj visited us in 2009 for the usual ZCG bolt-ons: intake, exhaust, springs and sway bars and after 36k miles he wanted more power. To satisfy his craving we installed a full GTM Stage 2 Twin Turbo kit and JWT HD clutch/flywheel. We also installed the DEFI-link gauges hidden from plain view. Raj wanted his G to look stock and we think he’s achieved that inside/out.

 

After putting 30k miles on the GTM kit Raj came back to us this year for a Blitz boost controller upgrade…nothing like more boost to satisfy your inner power junkie!  Before the controller and tuning at 7lbs of boost the G made 369hp/322tq to the wheels. At 9.5lbs those numbers jump to 409hp/376tq!

 

Stock wheels and a slightly larger exhaust still maintain a low-profile for this 400whp sedan. Enjoy The Boost Raj!

 

Bob F came to us on local dealer Beshoff Infiniti’s recommendation.  His G35 Journey sedan already sported a Borla exhaust, high-flow cats and JWT intakes but it needed tuning.

 

We removed the clip-on ecu to re-learn fuel maps and UPREV tuned with nice gains of 16hp/11tq for a total of 280hp/251tq at the wheels on this automatic-equipped HR engine:

 

Troy M owns this beautiful airbagged G35 coupe with custom paint. He came to us for an UPREV tune and the gains for this automatic-equipped VQ were impressive:

 

The dyno reveals  +17hp/15tq to the wheels but more importantly power and torque is up throughout the entire rev range!

 

In 2012 Erik  M. came to Z Car Garage with his bonestock G35 Coupe. With 100k miles on the odometer Erik was confronted with every enthusiast’s  dilemma: sell it off or keep it? Z’s and G’s are hard to let go and Erik chose to modify his car so we gave him the ZCG essentials: JWT POP charger intake, Motordyne plenum spacer, Bassani cat-back exhaust system, JWT clutch/flywheel, Koni shocks, and Hotchkis sway bars:

 

Here is the stock exhaust vs the sweet sounding Bassani system:

 

JWT intake, JWT heavy duty clutch and flywheel (a prudent upgrade for future power mods!)

 

Stock vs Koni dampers plus Hotchkis sways:

 

We also performed full 90k services and Erik was off enjoying his G…until he came back for a Stoptech Sport Kit to improve braking. Early last year he stopped by ZCG to consult with Rob on Forced Induction…Erik wanted boost and it would be in the form of a Vortech V-3 supercharger kit!

 

The build started in Fall ’13, with upgrades like an oil cooler, 900cc Bosch injectors, Aeromotive 340 fuel pump and everything powdercoated satin black-Erik wanted things low profile. This Vortech build was far from ordinary as we planned to run E85 (ethanol) to make more power. What’s the deal with E85?  Tuners have been using this “alternative” fuel for years  to extract power from forced induction setups. Specifically, E85 has an octane rating approaching 105; a significant jump from your typical 91-octane premium pump gas, but for about the same price. This higher octane rating allows wider tuning capabilities,  increasing power and reducing the chance of detonation with high compression or boosted applications.

 

Here are few key benefits of E85:

1. The higher autoignition temperature of Ethanol (689 degrees F, compared to gasoline’s 475 degrees F) enables E85 to be more knock-resistant and handle more boost or higher compression.
2. E85 initiates a cooler intake charge, allowing for higher boost pressure.
3. E85’s higher resistance to detonation (autoignition) allows tuners to implement more aggressive ignition timing, for improved combustion efficiency.
4. E85 can actually be cheaper to run than gasoline, especially compared to high-octane race gas. As I write this, 100 octane is $7.65 and 91 octane is 4.09 compared to E85 which is 3.72.

 

 

Running E85 is straightforward but critical components are needed as well as tuning. First, E85 requires larger injectors to compensate for 40-50% increase in fuel demand. Second, an aftermarket ECU allows tuning of fuel/timing maps. We used 900c injectors, a Haltech ECU and Flex Fuel Sensor from Zeitronix:

 

 

Playing with ethanol-to-gasoline mixtures or periodically switching from gasoline to E85 requires changes in fuel pressures. Switching over isn’t a simple run-to-the-pump-and-fill scenario and that’s the beauty of the Haltech…Erik can run 91 octane, E85, E70, E30 etc. without worrying about manually adjusting timing and A/F!

Erik keeps tabs on engine and air/fuel vitals with a gauge display from Zeitronix. We mounted it stealthily in place of the OEM retractable unit:

 

So does E85 really make a difference? The answer is a resounding YES! The G35 baseline dyno’d at 249hp/226tq and the Vortech helped increase power to 422hp/342tq to the wheels on 91 octane:

 

 

With the Haltech and E85, were able to extract 30hp/26tq at the same boost level! Final numbers are 462hp/368tq:

 

We think Erik loves the newfound power…he already took his G35 to the Wednesday Night Fun Drags at Sears Point recently with great results.  Before and after the Vortech/E85.  Erik ran a 14.6@97mph vs 13.6@111mph:

 

With some drag radials and urethane differential bushings Erik is hoping to cure wheel hop issues and dip into the 12’s! Maybe even lower as he plans to do a high compression built engine…of course using E85!

Enjoy the Ride Erik!