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Engine
The 919T System can be used on a stock engine. The stock compression ratio is 10.8:1, which is safe when boost is limited to 7 PSI and Premium fuel is used.
Ignition Retard : We are currently researching a stand-alone boost sensitive ignition retard system, but that is not currently available. Powercommander makes a Powercommander 3/Ignition Module/Hub/MAP Sensor combination that will replace our Gen3 ECU and will retard timing under boost and provide fuel enrichment, but the cost is $800+ total, so we're working on a more cost-effective alternative. We have modified crank trigger pickup coils available that replace your stock unit. This installs easily and retards ignition timing 4 degrees all the time. Four degrees is not a noticeable difference under normal conditions, but will provide the necessary ignition retard at 7 psi boost.
Pistons - We worked with JE Pistons to develop a custom forged 919T piston, please see the "Upgrades" page.
Head Studs - We worked with ARP to get some serious head studs for the 919T, please see the "Upgrades" page.
Rod Bolts - The 919 rods are the same as the 900RR rods and are pretty stout. But we are working with ARP on rod bolts for the 919T also, just to be safe. These can be changed from the bottom without taking off the head.
Drivetrain
Clutch - If you're going to be racing, we recommend the EBC or Barnett SRC Clutch Kit - includes new friction disks, Kevlar clutch discs and stonger springs.
Chain - The stock chain is a standard 530 chain, for longer life we recommend a high-performance O-ringed 530 chain.
Sprocket Sets - The 919 is set up with relatively short gearing. If you want lower revs on the highway, we recommend that you use a front sprocket that is 1 tooth larger. We stock these or they can be purchased from Sprocket Specialists. If you change sprockets, then the speedometer will be incorrect. You can just remember the difference, or get an electronic speedometer correction device, such as the Speedo Healer.
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