Shimless Buckets

Anyone converted to shimless buckets on here? I understand they are to reduce stress on the reciprocating parts of the valvetrain/springs, since with much less mass it is easier to rev higher without valve float and when using high lift cams you eliminate the possibility of spitting out a shim while reving high.

I'm looking to do this and add the GSC S2 Cams. Anyone comment/experiance on how the car runs after doing this?

Thanks!

Would like to know this also

I'm lost on this I thought supra tt's was Shimles ?? Never stripped one to no. I just no the shimless buckets fit the st205 gt4 head as an upgrade and advertised as supra ones.

There was a thread not to long ago re shimless buckets etc. In short they are not needed unless you are revving crazy high (8500rpm+) with extreme cams. GSC S2 will be fine without shimless buckets @8500rpm

Late generation MR2 turbo buckets fit, but it's a pointless mod unless turning huge revs. The engine isn't designed to rev much and those cams are not going to feed an engine that needs shimless buckets anyway. Similarly Ti retainers are pointless, indeed they are probably undesirable.

There was a thread not to long ago re shimless buckets etc. In short they are not needed unless you are revving crazy high (8500rpm+) with extreme cams. GSC S2 will be fine without shimless buckets @8500rpm

Thanks for clearing that up! I was told they wouldn't work without shim less buckets. This makes life easier! [GRIN][/GRIN]

No mention of needing shimless buckets in the blurb, and at such a low lift I would imagine the ramp profile is tame and unlikely to try and flick out an on top biscuit shim. They are still a fairly wild cam for road car engine, I would expect them to make a big turbo even more laggy:

Description

Stage 2- S2 Camshafts are designed to increase peak power on engines with upgraded turbo setups larger than 70mm. These camshafts are designed to increase air flow at higher rpm in 750-1000whp applications. They promote a flatter and broader torque curve and depending on the turbocharger, have proven to pick up 60-100whp gains. The RPM range that these cams are designed to improve is 4000-8500rpm. A valvespring upgrade is required when using these cams. We offer a single spring upgrade that can be used with the factory retainers, or a full dual spring and retainer kit for high rpm abuse. The idle is rougher than stock with these cams.

Manufacturer Description

GSC Power-Division S2 cams for the Toyota Supra 2JZ-GTE. The S2 cams are designed for those running a large single turbo, larger than 71mm. These cams will not have bottom end losses over our S1 cams; nothing but gains will be seen and will promote great peak power gains. Gains of 60-100whp (depending on Turbo) have been seen by simply bolting the S2 cams in and reshimming. Designed for a rev range of 4000-8500rpms, these cams require upgraded valve spring, but can be run on stock cylinder heads. 800-1100whp camshaft set with a ruffer than stock idle.

S2 Specs gsc-6030S2

Intake 274 Duration 10.20mm peak lift, 109 degree Centerline

Exhaust 274 Duration 10.20mm Peak Lift, 119 degree Centerline