Baseline pull from a stock 2.5L WRX, theses numbers are typically what you’d see for any 2.5L WRX without modifications on our DynoJet.
June 19, 2009
Stock 2.0 WRX Baselines
Baseline pull from a stock 2.0L WRX, theses numbers are typically what you’d see for any 2.0L WRX without modifications on our DynoJet.
June 17, 2009
Stock STi Baselines
Baseline pull from a stock 2006 Subaru STi, theses numbers are typically what you’d see for any year STi without modifications on our DynoJet.
June 16, 2009
07 WRX Transmission Upgrade
Often times people only consider transmission upgrades after they break something, or it has become a necessity due to the power output of the engine. In this case, however, the owner of this ’07 WRX understood there was a need for adding some strength for those occasional trips to the drag strip. Since this car serves as both a daily driver as well as a toy, it was important to our customer to keep the car civil for commuting and highway driving, while still improving acceleration and strength in lower the gears.
To meet our customer’s requirements, we recommended replacing the stock gear set with PPG gears and synchros, using straight cut gears for first and second, helical cut gears for third and fourth, fifth gear remains stock. Using the stronger straight cut gears for first and second means the trans should withstand repeated launches at the drag strip without consequence.
It’s no secret that straight cut gears generate more cabin noise than helical cut gears, so by using straight cuts in combination with helical cut you get the best of both worlds. The strength where you need it, for launching, and by the time you hit third, the transmission noise is still docile enough for everyday street use.
Along with the installation of the gear set, we also installed a new Southbend clutch. After the clutch break in period he’ll be back to get the car on the dyno for a tune, we’ll post an update and let you know what kind of numbers the car makes.
June 3, 2009
COBB DP Neckdown Removal
Here are a few shots of a quick mod we do. In order for the COBB downpipes to mate up to the factory Subaru exhaust they have a neckdown where the downpipe and midpipe meet. Even when you upgrade to a larger cat-back exhaust, the neckdown is still a choking point for the exhaust. By removing the neckdown you remove the choking point, allowing you to reap the full benefits of your aftermarket exhaust setup. In addition to removing the neckdown, when we do this modification we replace the warp and leak prone 2-bolt style flanges with v-band flanges. The V-Bands allow the connection to be more easily serviced, and they hold up better in performance applications, as they are less prone to warping and exhaust leaks.
June 1, 2009
Wastegate Spring Selection
When selecting a wastegate spring, one of the most important things to determine is the LEAST amount of boost you want to run. The reason for this is because a turbocharger cannot run less boost than the pressure rating of the wastegate spring. If you want to run more boost than the pressure rating of the wastegate spring, you can accomplish that with the use of a boost controller.
So how does all this translate into the real world? Well, if you have a setup where getting traction is difficult, you would want to switch to a wastegate spring with a lower pressure rating. The lower spring pressure rating will allow for lower boost levels in gears where traction is a problem, and with the use of a boost controller, you can then run higher boost pressures in the gears where traction is better thus improving the drivability of your vehicle.
Depending on the turbo and exhaust system design, a wastegate spring can sometimes make up to three times more boost than what the spring is rated for with the aid of a good conventional electronic boost controller. For example, if a boost controller is installed that can apply pressure to the top port of a wastegate, an 8psi spring can make 24psi or more, although we typically do not recommend running more than 2x’s the wastegate springs rating as this keeps the demand on the boost control device low.
