VII/IX 20G vs GSC S1

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Jun 9, 2008 | 08:00 AM

#31

shivaswrath

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From: Norwalk, CT

S1's provide great power under the curve, check my profile for dyno results - great gains all around, fun street driven daily driver that doesn't have a lot of hiccups at all like some aggressive cams do.

And I'm on a stock turbo.

Jun 9, 2008 | 08:01 AM

#32

Mellon Racing

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From: Virginia Beach, Virginia

hiccups? you mean lope?

Jun 9, 2008 | 08:26 AM

#33

EvoBroMA

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From: MA

this graph is what sold me on the s2's an imperceptible loss of low end - for awesome top end gains.

Jun 9, 2008 | 08:44 AM

#34

Elu

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From: Newish Jersey

damn. im in the same boat. updating the turbo soon(not green). i already bought my s1s awhile ago and the single valve springs and retainers. would I need to change the timing belt? I see people just throw " oh yeah change the timing belt " or " stock one will work fine. " The car recently hit 40k.

Jun 9, 2008 | 09:55 AM

#35

Mellon Racing

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From: Virginia Beach, Virginia

personally, i'd do the water pump, tensioner and belt while I'm in there at that mileage.

Jun 9, 2008 | 10:09 AM

#36

8000rpm

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Mellon there are moment's when you dont do WOT pulls from begining to end. If you hit it from a mid point in the rev range , would the s2's still make as much torque as the s1's?

Jun 9, 2008 | 10:21 AM

#37

Elu

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From: Newish Jersey

Quote:

Originally Posted by Mellon

personally, i'd do the water pump, tensioner and belt while I'm in there at that mileage.

thanks for the advice!

gonna order the timing kit from mitsuparts.net

Jun 9, 2008 | 11:30 AM

#38

apagan01

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From: digging for oil

Quote:

Originally Posted by RyeLou

The test car wasn't stock turbo so gains wouldn't be the same. I did read the test and the results seemed great for what they were testing but it's not something I'm interested in yet. S2's seem great but not idea for a daily driven stock turbo car.

well brother i can tell you iam rinung 272's cossi cams on stock turbo and daily driven everything normal except i chose to get them tunned loppey,
but spoolup is amazing and ot to mention mid and top holly crap once we drove the car immediate noticeable mid top power and dynodynamics showed the powere gains from the powercurve moving to the right of the graph.

of course Jestr tunned the car

Jun 9, 2008 | 11:33 AM

#39

apagan01

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From: digging for oil

Quote:

Originally Posted by RyeLou

I drag race a couple of times a year but daily drive the car. I love the initial pull when boost hits but it feels flat afterwards. I'd like a little more power up top witout losing what I've got.

After reading the whole AMS cam test it seems like I would be best off with GSC S1's or the HKS 272's would be fine too,

that exactly why the reccomended are 272's ,,, you are looking for your powerband to move to the right "up top power" wont fall on its face after 6500 anymore

Jun 9, 2008 | 08:00 PM

#40

RyeLou

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From: Michigan

Quote:

Originally Posted by apagan01

that exactly why the reccomended are 272's ,,, you are looking for your powerband to move to the right "up top power" wont fall on its face after 6500 anymore

So you say HKS then? OR do you mean GSC S1s by what you said?

The S2s are very respectable on the graph posted, but it wasn't a stock turbo or stock head...so the result are very different from what you would otherwise see.

Jun 9, 2008 | 09:58 PM

#41

v rod

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From: NorCal

Quote:

Originally Posted by mudduck

s1's are too mild, especially if you're even considering a bolt-on stockish turbo upgrade (20g or Green). s2's seem to shift the power curve more to the topend (good for drag race, not as fun for street...)

Cosworth 272's are somewhere in the middle...

I actually swapped out my S1's (average on stock turbo; weak when I put on my Green) for Cosworths, and saw immediate improvements throughout the powerband -- yeah, even the "amazing" midrange that the S1's are supposed to provide was nothing compared to the Cosworths (better torque, faster spool, more midrange, stronger top-end = no-brainer)

i'm also thinking about doing this. s1's on stock turbo was great but now with the fpgreen, i'm not too impressed.

Jun 10, 2008 | 04:32 AM

#42

RyeLou

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From: Michigan

Yeah but for those of us with stock turbo who plan to be there for a while, S1's may be the route to go. Although it seems like most of the 272's would work well.

Jun 10, 2008 | 06:12 AM

#43

Chemwarrior

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From: Clarksville, TN

I ordered my S1s from JSC Speed yesterday. There is a two week wait from GSC for the S1s due to the high demand. I was offered the S2s has an alternate, but that would have involved me changing out the valve train internals. I called around to different companies, but nobody has S1s in stock so I am in a holding pattern until GSC manufactures some more.

Jun 10, 2008 | 09:40 AM

#44

BlackonBlack2

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From: GA

Quote:

Originally Posted by v rod

i'm also thinking about doing this. s1's on stock turbo was great but now with the fpgreen, i'm not too impressed.

do the cosworth 272 cams need upgraded valve train? thanks

Jun 10, 2008 | 12:45 PM

#45

Mellon Racing

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From: Virginia Beach, Virginia

Quote:

Originally Posted by 8000rpm

Mellon there are moment's when you dont do WOT pulls from begining to end. If you hit it from a mid point in the rev range , would the s2's still make as much torque as the s1's?

the differences in s1 and s2 are likely going to be the same at X rpm whether you started there or went through there.

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