Topgunz - air to air upgrade

turtle64b · 06-23-2018, 06:51 PM

Quote:

Originally Posted by redondoaveb

Nope. I installed a Vortech 2.85 sc pulley and it lines up fine with the stock jackshaft pulley. When I change my jackshaft to the high traction Vortech I'll have to add the spacer. FYI, 928 Motorsports carries the spacer, it may need to cut to length. Also, you'll have to use a longer bolt on the Vortech jackshaft pulley as it's wider than the stock pulley.

Stillen didn't use a Vortech pulley for the jackshaft, it looks like a Magnuson but I'm not positive.

Interesting...

Thanks for the info!!!

I'm not sure my tranny is ready for that much boost haha. Or me ready to spin the Vortech bearings that fast haha. But since I'm swapping out the pulleys anyways, I might go with the 3.15 jackshaft and maybe the 3.0 SC...

Per the Vortech calculator, I'm at 55.6k RPM now (with the serp-side 9lb pulley). Bumping down to the 3.0 while keeping the 3.15 ~stock size jackshaft would put me at ~58.4. Strongly debating stepping down the size since it'll keep me in the limits of the tranny.

If I had the 928 Supervortech upgrade, I'd go 3.47 jackshaft and 2.85 SC, which would spin it ~68k!

Did you just source the longer bolt from Lowe's or similar? Did you increase the SC-side idler?

Thanks again!!

redondoaveb · 06-23-2018, 07:53 PM

Quote:

Originally Posted by turtle64b

Interesting...

Thanks for the info!!!

I'm not sure my tranny is ready for that much boost haha. Or me ready to spin the Vortech bearings that fast haha. But since I'm swapping out the pulleys anyways, I might go with the 3.15 jackshaft and maybe the 3.0 SC...

Per the Vortech calculator, I'm at 55.6k RPM now (with the serp-side 9lb pulley). Bumping down to the 3.0 while keeping the 3.15 ~stock size jackshaft would put me at ~58.4. Strongly debating stepping down the size since it'll keep me in the limits of the tranny.

If I had the 928 Supervortech upgrade, I'd go 3.47 jackshaft and 2.85 SC, which would spin it ~68k!

Did you just source the longer bolt from Lowe's or similar? Did you increase the SC-side idler?

Thanks again!!

I know I'm over spinning the Vortech bearings, I'll see how long they last. I might buy a spare V3 Si and send it to 928 for the bearing upgrade just in case.

I haven't gotten the bolt yet, my pulley won't ship from Vortech until next week. I have the 3" idler pulley installed.

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