So has anyone been running a fp green hta on either of these cams that has regretted not getting the opposite cam? Im on a stock motor running 22psi on 93 pump and cant decide if the s1's will leave me wanting more or if the s2's are too large for a Green? Or im open to other cam suggestions to get the most fun out of this FP Green on the street.

coupe_nasty said:

So has anyone been running a fp green hta on either of these cams that has regretted not getting the opposite cam? Im on a stock motor running 22psi on 93 pump and cant decide if the s1's will leave me wanting more or if the s2's are too large for a Green? Or im open to other cam suggestions to get the most fun out of this FP Green on the street.

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Crank up the boost and throw some s2s in. 30+ psi w s2s and supporting mods should make well over 500whp.

A maxed out 16g setup benefits from s2s so you will see a big diff between s1s and the loss or low end will be well worth it.

I personally think the s2 is the best cam out there for green sized turbos, I'm waiting to throw some on my 71hta to get over the 130mph mark

I wouldnt get the s2. the s1 will give a far better powerband on a 2.0 green. if you upgrade the block to 2.3 then get the s2.

It really depends on what you plan on using the car for. If it is a DD that you want low end and a good wide power band go with S1 cam. If it is a weekend warrior and you plan on drag racing it go with s2 cam.

Bringing this thread back as it is exactly my situation right now. Current mods are in profile. The GSC S1 cams say up to 400hp, and my current tune on e85 is 45lbs an hour on my 50 trim at 28 psi, and I feel the car is likely already making more than 400whp, judging by my 70-90 times. The GSC S2 cams require upgraded valvetrain which im ok with but might be a little too big for a 50 trim?

is there a cam that would be right in between an s1 and s2 performance wise? i feel like the green hta falls right in between these cam options.

You could always go with the trust worthy HKS 272. They are less aggressive then the S2 and will pull all the way to redline. I haven't seen any results from the S1 but seems to be a great match for the green based on lift and duration. I would try that...

Yeah...I would go with a set of S1 cams and adjustable gears. The adjustable gears give you some of the in-between. Or you could go with S2 cams and dial them down slightly with cam gears. Personally, I would go with the less aggressive cam and adjust the gears for better better power/power-band.

In the evo world most recommend the S2 over the S1 even on stock turbo evo 8's and 9's. Of course that is not the same as a dsm 4g63. My gsc s2 cams on my bb 50 trim setup hit 28 psi at 4400 rpm, and according to link lost about 20 hp/tq from 4.5k-5.5k compared to stock cams but gain 35-55 hp/tq from 5.5k to 7.5k. Im sure some S1 cams would give me more midrange but I am happy with the S2 especially once I go bigger turbo this spring.

In the Evo world, the S2 is still too big for the stock turbo. I've seen a stock turbo 9 go from 380whp on E85 to just over 400whp on E85, from just swapping to the smaller, yet better suited S1 cams, and re-tuning. In fact, the only two 400+whp stock turbo Evo 9s I have ever personally seen were both running GSC S1s.

How about a set of kelford 264's? Ive heard they are similar to other brands 272's so maybe smaller than s2's which are 274's? Anyone running kelford 260,264,268?

Is anyone running kelfords 264/268 combo? or the kelford 272/272 (Low Lift) combo?

little bit of an old thread. however I have had the FP2s in my Evo 3 (similar to 2g dsm), and had GSC S1s in my Evo 7. What I an say it depends on what you value most. Alot of people dont mind the loss of midrange and value the top end pull of an aggressive 272 cam. However after having both I honestly preferred my GSC S1s for the midrange, and drivability. I did make very good power on my GSC S1s. full supporting mods Evo 7 @ 30 pounds of boost w/stock turbo car put down 406 WHP, and 391 WTQ...pretty much 400/400. I preferred that over my BW S259 build with FP2s at 32 psi.

Response and torque down low = fun
A few misconceptions on cams should be addressed. First, that advertised duration number means very little. DSM HKS 272s are MILD. Kelford 272s are ENORMOUS.
A Kelford 264 is ever so slightly more aggressive than BC272s, and HKS 272s are way down on BC272s. Tomei 260 Poncams are very close to BC272s as well. I would put the GSC S1 in with the Kelford 264/Tomei 260/BC272 - the GSC, Kelford and Tomei cams are have high lift compared to the others. You may need cylinder head port work to make use of this higher lift!

There is no magic cam - no cam can make the power of a HKS 264 down low and a Kelford 272 at high RPM (that's why they made VTEC). If you get Kelford 272s instead of BC272s, you'll make more power at high RPM, but lose out on spool, there's nothing you can do. Pick one that's somewhere in the middle and don't lose sleep over the fact that you might be down 5hp over something with a bigger cam. If you sacrificed a lot of spool, you are allowed to cry yourself to sleep

Here's a small list I compiled of cam specs.

GSC, Kelford and Tomei's lift figures are calculated with a 1.73 rocker; HKS and BC use 1.7, so I equalized them to 1.73. I don't know what Jun uses, but I suspect a 1.7 (numbers unchanged).

**Keep in mind that the duration numbers are either measured at 1mm (0.040") or at 0.050" - you cannot compare these values!**

GSC S1 Lift: 11.0mm/10.5mm
GSC S1 Duration @ 1mm: 216/220

GSC S2 Lift: 11.03/11.03
GSC S2 Duration @ 1mm: 230/230

Kelford TX264 Lift: 11.00/10.35
Kelford TX264 Duration @ 1mm: 216/216

Kelford TX272 Lift: 11.00/11.00
Kelford TX272 Duration @ 1mm: 226/226

Tomei Poncam 260 Lift: 10.70/10.20
Tomei Poncam 260 Duration @ 1mm: 215.5/214.5
Tomei Poncam 260 Duration @ 0.050": 209/209

Tomei Procam 270 Lift: 11.50/11.50
Tomei Procam 270 Duration @ 1mm: 227.5/226.5
Tomei Procam 270 Duration @ 0.050": 221.0/220.5

Tomei Procam 280 Lift: 11.50/11.50
Tomei Procam 280 Duration @ 1mm: 232/233
Tomei Procam 280 Duration @ 0.050": 225.5/228.5

HKS 264 Lift: 10.48/9.97
HKS 264 Duration @ 0.050": 187/186

HKS 272 Lift: 10.48/9.97
HKS 272 Duration @ 0.050": 195/195

BC 272 Lift: 10.36/9.83 (Stage 2)
BC 272 Duration @ 0.050": 208/212

BC 276 Lift: 11.27/11.27 (Stage 3)
BC 276 Duration @ 0.050": 220/220

BC 284/280 Lift: 11.63/11.11 (Stage 4)
BC 284/280 Duration @ 0.050": 230/226

BC 280 Lift: 10.90/10.79 (old profile)
BC 280 Duration @ 0.050": 218/216

Comp 101100 Lift: 10.34/9.93
Comp 101100 Duration @ 0.050": 204/204

Comp 101200 Lift: 10.44/10.03 ***These are the same as FP2s
Comp 101200 Duration @ 0.050": 212/212

Comp 101400 Lift: 10.54/10.13
Comp 101400 Duration @ 0.050": 220/220

Jun 272 Lift: 10.62/10.62
Jun 272 Duration @ 0.050": 211.5/211.5


mean4g - I'm going to hazard a guess that your preference has more to do with the turbo than the cams, since GSC S1s are way bigger on lift and similar on duration.

I would guess 210/214 at 0.050" for the GSC S1 vs 212/212 for the FP2
Lift is 11.0/10.5 for S1 vs 10.44/10.03 for FP2 using the same rocker

Some camshafts are the product of more testing, so it's possible that the newer GSC S1 is better all-around than the older FP2. Notice the trend of higher lift with the modern cams (GSC/Kelford/Tomei/BC's new stuff). Most of the older cam technology is lower lift, so it may very well be that low-lift cams just don't perform well on our cars.

Thanks for the info! This is straight from gsc's ad for the s2's....

The S2 cams are designed for those with more power in mind or a larger turbo. No low end power is lost vs the stock cams when used with the larger turbos. The S2 cams will show gains of 50-70whp over the stock cams and in some cases more in the higher RPMS. Great for 2.0L engines revving to 9000rpms or for Stroker motors revving to 8000rpms. The S2 Cams are suggest to run on our upgraded Beehive valve spring replacement or can be run at the stock revlimit and factory boost on the stock spring. Designed for a rev range of 4000-9000 RPMS(2.0L or 3000-8000 2.2L+), 400-700whp applications

Now im not sure what they mean by (Larger turbos) im assuming larger than a green. Ive been leaning twards the S2's after reading this. anyone else have any input?

coupe_nasty said:

Thanks for the info! This is straight from gsc's ad for the s2's....

The S2 cams are designed for those with more power in mind or a larger turbo. No low end power is lost vs the stock cams when used with the larger turbos. The S2 cams will show gains of 50-70whp over the stock cams and in some cases more in the higher RPMS. Great for 2.0L engines revving to 9000rpms or for Stroker motors revving to 8000rpms. The S2 Cams are suggest to run on our upgraded Beehive valve spring replacement or can be run at the stock revlimit and factory boost on the stock spring. Designed for a rev range of 4000-9000 RPMS(2.0L or 3000-8000 2.2L+), 400-700whp applications

Now im not sure what they mean by (Larger turbos) im assuming larger than a green. Ive been leaning twards the S2's after reading this. anyone else have any input?

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I have ran the FP2s, and I can tell you they will loose midrange torque/HP on a dsm... I don't see the GSC S2s being any better in that regard. The only way I could see a GSC S2 not loose midrange is on a Evo 9 MIVEC engine.

The GSC S2s seem to kill it on an Evo 8, beating both Kelford 264 and 272 combos almost entirely across the board. I wouldn't discount the midrange potential.

http://dsportmag.com/the-tech/showcase/camshafts-mitsubishi-4g63-evo/final-results/

Im thinking for street driving/auto cross, the green with s1's would be ideal. I just hope the diffrence of s1's vs stock cams is worth it. I dont want to regret not going bigger.

Canadian_CD9A said:

The GSC S2s seem to kill it on an Evo 8, beating both Kelford 264 and 272 combos almost entirely across the board. I wouldn't discount the midrange potential.

http://dsportmag.com/the-tech/showcase/camshafts-mitsubishi-4g63-evo/final-results/

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Twin scroll vs single scroll not to mention it's an evo vs a dsm. Apple's to oranges IMO

coupe_nasty said:

Im thinking for street driving/auto cross, the green with s1's would be ideal. I just hope the diffrence of s1's vs stock cams is worth it. I dont want to regret not going bigger.

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I think s1s are a great cam personally.. Great midrange. If you don't mind to give up some midrange you'll love the top end of the s2s. Just depends on what you are trying to do and what you prefer.

The S1s are a lot more aggressive than people think!!!