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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 04-25-2019, 01:33 AM   #1
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Valve springs: GSC vs Supertech

I'm putting together the last pieces for my built FA20 but I'm stuck on two options for valve springs, GSC beehives (GSC-5056) or Supertech 74lb dual springs (SPRK-1002-BRZ). Im shooting for 18-25 psi with 10:1 pistons. Any help is appreciated.
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Old 04-25-2019, 07:42 AM   #2
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I've been hearing about GSC in the tuning world longer than Supertech. I don't know that either will have a benefit over the other. Who wouldn't want a beehive?
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Old 04-25-2019, 11:01 AM   #3
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Supertech has been around for a while. I've mostly seen them used on Honda's, I don't think you have anything to worry about if you decide to use them. I would go with whatever fits your budget.
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Old 12-22-2019, 04:49 PM   #4
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I'm doing the recall would it be worth it to put any of these higher performance springs
in? Im NA but may go FI later on. If I stay NA is there any benefit?
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Old 12-22-2019, 05:05 PM   #5
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I'm doing the recall would it be worth it to put any of these higher performance springs
in? Im NA but may go FI later on. If I stay NA is there any benefit?
If you're not performing the recall personally, they will not use aftermarket springs. The recall work is to replace 1 part number with another, not to just change the spring arbitrarily
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Old 12-22-2019, 05:23 PM   #6
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If you're not performing the recall personally, they will not use aftermarket springs. The recall work is to replace 1 part number with another, not to just change the spring arbitrarily
Darn.....
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Old 01-01-2020, 04:25 PM   #7
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I am getting the GSC 5756 springs installed in a week. I will let you know

My springs failed although my car was outside recall. I don't think it is FI but the service recommended something better than stock springs for FI. Since I have voided warranty long ago with installing FI, I decided not to get stock spring installed again. And, since my car is only boosted 9 psi (JRSC), GSC 5756 seemed most suitable.
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Old 01-07-2020, 02:13 PM   #8
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GSC 5756 is working ok for now.
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Old 01-07-2020, 02:44 PM   #9
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GSC 5756 is working ok for now.
good to know
i 'm installing them too
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Old 01-11-2020, 04:44 PM   #10
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GSC all day, the beehive spring is a far superior design.
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Old 01-27-2020, 01:58 PM   #11
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I was feeling uneasy with pushing the engine in the beginning. Since last week weather is warmer and I am feeling more confident about the engine. The GSC 5756 springs made a big difference in power. Engine is revving up much more eagerly. Idle sound also changed quite a bit which, I think, is normal with different springs.
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Old 01-27-2020, 02:06 PM   #12
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i'm noticing the same.. i still haven t revved over 5000 yet but it "feels" much solid how it revs , but i think the bit heavier forged rods i put, contribute too.. also the noise of valvetrain at idle is a bit different, I confirm
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Old 01-27-2020, 02:25 PM   #13
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Quote:
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i'm noticing the same.. i still haven t revved over 5000 yet but it "feels" much solid how it revs , but i think the bit heavier forged rods i put, contribute too.. also the noise of valvetrain at idle is a bit different, I confirm
I thought about replacing the short block with a built one while having the springs installed but ... cost and and my decision to stay at this boost level, I didn't. How much was the additional cost to replace the rods, if you don't mind telling?
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Old 01-27-2020, 03:02 PM   #14
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i threw a rod so for me was a mandatory thing
my mechanic doesn t count hours for this kind of job, i replaced oem short block, installed rods in it, new head gaskets, arp head studs and gsc springs and the whole rebuild costed me around 1500€ (1700$ more or less) of labor

I threw the rod while at 4000 rpm and less than 0.5bar of boost, but I guess the racing fuel and hugely high ignition timing were what destroyed it
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