Has any one ever had problems working with GSC S2 Cams? i initially had problems dialing them in and dealing with early onset of knock all the way through the power band? a buddy of mine said that it could be a bad grind. all i have ever seen on this forum is rave reviews which is why i got them. but, has any one ever had a bad experience with them? i just saw that buschur was having some small issues with a set of kelfords and GSC and Kelford are both highly spoken of here ?

 

I've been self tuning my s2s for almost 6 months . I've eliminated a bunch of the knock simply with fuel and timing. And the rest of my tuning will probably be just figuring out more of that

 

what cam gears do you run?

 

what do you mean when you say "dialing them in" Do you mean degreeing them in? Or tuning?

 

Good to have someone from GSC here. Not tring to get off the subject but if you have some reconmendations on degreeing these cam, it would be great. I purchased a set of the S2 cams from a vendor here and I did had to remove timing as well in order to get rid of the knock. I did not degree them as I did not installed cam gears but I will most likely be installing cam gears.

 

USCGSam, I see in your sig, that you have a full rebuild to the engine.

Do you know if the block was decked? If yes, How much?

How much was the head surfaced?

By milling these parts you change the center line of the cam and crank relation.
Along with a bump up in compression.

 

Hi Travis,
im using S2 cams too and can you kindly advise me that should i slightly advance or retard the intake or exhaust cams for better low end response?
Ive facing super rich problem whenever i immediate WOT which make my car hard to accelerate.

Should i just follow GSC cam deg setting?

 

Unfortunately I cant tell you, like stated above, differences in engine builds and head/block tolerances can change that....even stock. There is no magic number that works for all cars. The best thing to do is degree them in. But it sounds like you may have more of a tune issue than cam timing.

 

Thanks Travis...
Btw, sorry for noob question but what do you mean deg them in?

 

Stock cam gear yes i meant tuning as they are not degreed, and here is my build thread i had the block inspected and it didn't need to be decked. and it is awesome to have a GSC vendor in here. i personally don't think the cams are my problem but my buddy seems to think so and this thread is helping to clear that up for me.
https://www.evolutionm.net/forums/al...ld-thread.html

 

I can pretty much guarantee that the cam grind is not the issue here. Every cam is ground on a CNC machine that locates it on the dowel pin of the nose of the cam. Then checked in a separate machine for lobe specs.
There is so much that goes into tuning a car, especially if you have gone to Speed density, Coil on Plug, engine rebuild, larger turbo ect ect ect.
My advice is get it to a tuner and let them have at it.
also, are you sure that you are seeing actual knock/detonation? Eliminating the balance shaft can cause noise that the knock sensor could pick up-"phantom knock" Granted you did break 2 pistons i would assume you have a lot of detonation at one time, but it sounds like youve been playing with the tune. Just something to think about.

 

Degreeing in a cam means that you are checking for the correct relationship between the crankshaft and the camshafts. Do some google searching, its a very tedious process that I can't just explain how to do on here.

 

your right and the car is currently at a shop getting looked at now. i didn't think it was the cams but i just wanted to see if any one else was having problems. reassuring myself.

 

Noted & Thanks Travis

 

I "hate" to be the one to bring up a thread from the dead but I do have a problem here. Not saying it's the cams but my tuner strongly suggested one of three things could be my problem.

The scenario: Fully built 2.4l Evo 8 engine with 1000 cc injectors, GSC S2 cams (latest grind according to them), 300 lph fuel pump (both of which are deatschwerks brand), 9.5:1 compression with Wiseco HD pistons, SCAT H Beams, ported head work, Evo 9 intake (ported), CBRD BBK-B turbo, AEM Intake (questionable), Stock 02 housing (but ported) and HKS TBE exhaust.

I just came back from my tuner and no matter what he did one the tune, we could not get more top end power. We could fatten up the lower end below 5,500 but anything above that the peak didn't budge. Which brings us to the conclusion that I have a restriction somewhere.

His immediate thoughts were: The cams, the intake, and the stock 02 housing. I was expecting much bigger numbers from this car. I can't even get 400 whp. If we put the car at 20 lbs of boost I get 397 hp. If we put it at 23 lbs, we get 397 hp but a much wider and larger torque curve below.

Has ANYONE seen a problem with the S2 cams lately?