I've read and read all the debates on these two cams. My tuner says go with S2 on a stock frame turbo, manufacturer says S1 with a stock or stock frame turbo.

My only questions is can anyone with a stock or stock frame turbo Evo IX with the S2 mivec cams attest to any loss of throttle response.

I don't wanna start another S1 or S2 debate, but GSC told me that on a stock frame turbo you could lose (or not gain) as much throttle response on an S2 as compared to an S1.

I do not mean turbo spool (like I said I've read over and over), I mean throttle response as in when you press the accelerator pedal how quickly does the engine react and rpms start to increase.

Does this question even make sense? Please someone lead me in the right direction if I'm wrong here.

 

also interested as I am considering buying s2s!!

 

Greg at GSC told me to go S1 too, and I've also been told to go with S2's or Kelford 272's by everyone else, including my tuner. So....I'm interested to see if that trend continues on this thread.

 

bump for a good question

 

I feel like its probably the fact that youll only benefit so much more from the S2's over the S1's, itll completely negate worrying about losing a little throttle response, if any.

In short, theres more to gain from doing the S2's than S1's overall than there is to lose.

 

If you dont have first hand experience, then this entire quote is pure speculation.
If Greg from GSC says to go for S1's after you've talked to him about your setup, low and behold he probably knows what he's talking about... Seeing as he's the person that MAKES them.

Personally i'm doing S1's on my 2.3 Mivec build, as i wanted Pure Response on my FP Red setup and didnt want to overcam it (read: lost response) like i did with my Kelford 272's.

my 2c

 

greg told you to use the s1's with your 2.3l? i'd say get the s2's!

 

no thats not what i said. I chose S1's.

 

I agree with you mike that the manufacturer probably knows what he's talking about, it just seems like the majority of tuners out there including my own recommend going with a more aggressive cam.

I'm just curious is if anyone with S2 on a stock frame has noticed any loss of response. I personally think it's a cool idea to go with say an FP red (with a little more lag) and balance it out with a snappier cam for response.

Anyone else out there with this experience?

 

Hey could you tell us a little bit more about your experience with the kelford 272 since they are comparable to the S2? What did it feel like, what did you notice as opposed to the stock cams, etc.

 

From first hand experience I have not felt really any loss in throttle response on my setup. Although I have done other mods at the same time of the cam install. I can certaintly attest that these cams show no signs of a laggier spool up than when my car did not have them. Infact it spools up a hell of a lot faster especially in higher gears. I do believe you will have a slight advantage in midrange tq with the s1's depending on how your car responds to them but the s2's will definately shine with a larger setup. From reading John Bradleys post about Big cams little Turbo thread I was convinced these would be a better choice. I know this isn't what your really inquiring about but as far as I am concerned my car has not changed negatively in response with s2's.

 

I doubt you will get a response where one person ran both setups. All you will get is people giving you advice on what they have now (S1 or S2).

I went with S1 recently and if I was going to do it over again I would probably do S2, but I did not want to upgrade the drive train with the head on.

I live about 30 miles south of you, you are more then welcome to drop my neighborhood and go for a drive to see how the S1 feel.

 

thanks erics, that's the exact type of info I was looking for.

xmaciek82x that would be awesome to check out your ride, I'll pm you.

 

https://www.evolutionm.net/forums/ev...am-timing.html

thats a thread i started when i first put the Kelford 272's in.
I then adjusted them for better response (+5,+3), but needed 2psi boost to keep the same power up top.

I'm going to attribute the laggy experience to the external wastegate setup i was running. Because the exhaust pulse was "longer" with the large cams, my setup was really laggy because the twin scroll setup wasn't split correctly. Once i put the internal wastegate back on (to close the flapper) i got alot of response back.

So i guess my Large cam experience was flawed. But i'm still sticking with my S1 cams. Another reason for this is because i'm going 1mm Oversize on my Valves. This will effectively increase my flow rates at lower lift values, kinda like having bigger, longer duration cams.

But like GSC states on their website, the GSC S2 cams will not lose spool on LARGE turbos....
You be the judge.