Very encouraging results! This definitely changes the "280+ degree cams are for race cars only" mentality that I've heard repeatedly on the forums... Good job guys!

 

Hey how is your twin disc holding up?

 

I am curious about this comment - in particular how driveability would be affected if one were to go from kelford 272s in an EVO 8 to S3 in an EVO 8. Especially since EVO 9 cams in general seem to be better in driveability due to MIVEC. Any insight is highly appreciated!

 

I can answer this for you! There is not any difference drastically from the kelford 272 to the gsc s3.. the car feels a little smoother maybe just cruising around but thats about it..

i could take you for a ride in my car and say it was on stock cams.. and you wouldn't be able to tell the difference.

keep in mind this is a 2.3L though.. Scott also said in his stock block they drove alittle smoother then his kelfords as well.

 

I assume the green line are stock cams, right? I assume the blue line are Kelford 272s, right? I am trying to see how the S3s performed in the midrange.

 

the red line on the first graph is S3's blue and green line are stock cams.

 

OK. +65whp and +45wtq at the same boost level. I am tracking. Usually these gains are experienced while adding boost. Awesome. For a while there, I thought I was looking at stock, Kelford, and S3s respectively.

 

nope 2 stock cam pulls, and 1 S3 pull. same road, same temp, same boost, same timing ect, adjusted the a/f but same a/f reading after adjusted.

 

Hey hows your clutch handling
Any slipping

 

sweet gains from those cams

 

Wow, so the S3s are as driveable as the kelfords 272s on your 2.3L (same here) with more top-end potential. I watched your youtube video of the S3s idling - they sound BAD *** and yet idling well. Are you still running on O2 feedback at idle? I might have to pick up a set of these soon!!!

 

Not a huge difference in power considering your running more psi and have lots of extra non stock parts. Would have thought more.

Anyway nice comparison. Good gains from the cams.

 

Yes I agree. something to keep in mind though.. 32-33psi is a lot of boost for a 2.4L to maintain. its not as far off as 36psi on a 2.3L as you think.

his car makes great power though for the mods.

he now has my old map rev 3 intake mani on their and Mil.Spec 65mm tb also.. so we will post new results after we fix his electrical gremlin.

 

Ok i just wanted to update this thread to show you guys actual track comparison results vs the graphs.



The blue and red line is when the car went 130mph.

The modifications on the car at that time were (stock cams, stock throttle body, stock intake manifold)

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The Green line is after I installed a map rev3 intake manifold (the one off my personal car), GSC S3 cams, and the throttle body off my car (MIL.SPEC 65mm tb).

you will notice there is basically no loss in spool, even going from stock cams to large GSC S3's.

you will also notice that the boost is around .5-1psi less at higher RPM, but still makes way more power over the old combination in parts.

Now here's the cool part. You add bigger cams, ported intake mani & tb, lose no spoolup or transient response (i drove the car so i can say this regarding the response time).

yet make way more efficient power everywhere. The car picked up a solid 3mph at the drag strip. He didnt touch the boost at the drag strip, so i know theres atleast another 1mph in the car as it sits with more boost.

here is the slip comparison:



something else i wanna note. when i drove his car, his exhaust note was really nice. the buschur tbe has a really quiet but low tone note to it, and it clearly doesnt hurt power at all. my cobb is way more high pitched wide open throttle. so if anyones looking to get a really low tone exhaust note id look into this muffler from buschur: https://secure.buschurracing.com/cat...8a510febc425dd Even at 600WHP+ the car remains pretty quiet.


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keep in mind, if you have a 2.0L engine, and you go from stock cams to gsc s3, you will see around a minimal of 250RPM in spool loss if not more (Using Scotts car for example). There is no spool loss with larger 2.3-2.4L as you can see, but it will vary depending on your setup. English Racing has seen the same results as this as well when they compared the S3's to smaller cams on larger displacement engines. the spool does not become effected, and the car just makes more power efficiently. This isn't something that you normally see in the automotive world.. its like taking a larger turbo against a smaller turbo and having the larger turbo spool faster then the smaller + kill it on the top end.. GSC clearly did their homework when creating the S3 Cams.