Does anybody have data logs of...

[MrMischief]

...running different sized pulleys and measuring the actual boost levels of each one?

The reason I ask is that I've read several reports of claims from several manufacturers that a 15% pulley makes 1 bar boost, as does the 17% pulley and the 19% brings boost up to 1.2 bar. Surely the 17% pulley should make more than the 15%....or the 15% should make less :argh::shut up:

If anybody runs them with a boost gauge or log...can they please pipe up their findings here...cheers :thumbs up:

[leeg87]

with a stock head and a 17% pulley I regularly triggered the traction control light to stay on - High MAP pressure indicator meaning i seen over 18psi, this was only on very cold days though.

Normally I would see just under 17psi on the scan gauge.

Now with my head its dropped to 15.5psi :o

as a general rule of thumb:

15% - 1 bar
17% - 1.1
19% - 1.2

[MrMischief]

Cheers, that's what I thought but had read conflicting info elsewhere :thumbs up: