NST Pulley Dyno Results - Toyota Yaris Forums

CASTREX · 11-18-2008, 12:23 PM

Finally some back to back Dyno for the Pulleys!

This is probably one of the more popular mods for the Yaris. NST FTW!

Richard,

Correct me if I'm wrong but some of the benefits from the lightweight/under drive pulleys are not only the power gains (as show in your graph) but also the ability of spin the engine faster and therefore been able to get it faster into the power band?

Same principle as with a lightweight flywheel.

BTW, do you know that Fidanza has a lightweight Flywheel for the Yaris and for the xD. There is another option for the Yaris from SPEC. They run for around $300.
Have you considered throwing one of those into your combo?

Oh, and your observation is accurate the only under driven pulley is the Crank pulley. Is 10% smaller. The Alt and WP are same size as the OE.
NST has an underdrive pulley in the works for the xD as well.

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11-18-2008, 12:23 PM	#7
CASTREX Who said Yaris was slow? View User's Garage Drives: Yaris T-Sport 2008 Join Date: Nov 2006 Location: Costa Rica Posts: 1,287	Finally some back to back Dyno for the Pulleys! This is probably one of the more popular mods for the Yaris. NST FTW! Richard, Correct me if I'm wrong but some of the benefits from the lightweight/under drive pulleys are not only the power gains (as show in your graph) but also the ability of spin the engine faster and therefore been able to get it faster into the power band? Same principle as with a lightweight flywheel. BTW, do you know that Fidanza has a lightweight Flywheel for the Yaris and for the xD. There is another option for the Yaris from SPEC. They run for around $300. Have you considered throwing one of those into your combo? Oh, and your observation is accurate the only under driven pulley is the Crank pulley. Is 10% smaller. The Alt and WP are same size as the OE. NST has an underdrive pulley in the works for the xD as well.