i would go with 280's since u have the additional flow, so maybe kel 280 or s3's

 

correct me if iam wrong, but why wouldnt someone with a stock turbo setup go lets say with 280 cams?

 

Bigger cams need more revs and therefore airflow up top to make power. The stock turbo is pretty much out of breath by the time it gets the revs up high enough for a 280 cam to make power.

 

Therefore, depending on what turbo ur running, the characteristics of it should dictate the cam selection! i think we'r both on the same page.
Thanks

 

Exactly.

 

i want to see some proof on this!

 

Mike, can you post a thread or two that shows this?

I'm not calling you out, I just want to see some concrete data before I pick-up some S2 cams.

 

You are correct and turbo choice does matter, however someone running a 2.3 or 2.4 flowing 15-20% more airflow than a 2.0 would require a larger cam than a 2.0. However, the 2.3 can't rev to 9k like a 2.0 so the S3s, for example 288s are not the best choice in my opinion. A stroker motor will "theroticly" make the same peak power with a 274-280 as a 288 cam but the smaller advertised cam will have a better powerband than the larger 288 on a stroked motor. Where you are going to make your money on a 2.3 is with a custom 274 or 280 advertised cam that has a higher effective lift @ 1mm and has a lift of 12mm. Technically you are designing a 288 spec cam in a 274 or 280 advertised duration... That gives you a higher ramp rate which increases spool, has the lift of the 288, and gives you the best "usable" powerband for the 2.3.

My 2.4L will have a custom set of GSC cams that are to these spec:
274 w/ 12mm lift. (If you go look at GSCs website you will notice that they are a mix between the S2s advertised duration and the S3s effective duration and lift)

Greg helped design these cams specifically for a 2.2 or larger. They are not in production yet, and may not be for some time... They are still in the early stages of testing. I will be doing a back to back between a std S2 and the custom cams to show the difference

Here is the link to Aaron's dyno that he just did last night testing out these new cams. https://www.evolutionm.net/forums/ev...e-25-5psi.html He is only spooling 300rpms slower than a FP Black with his large Single Scroll HTA3586 with conservative timing at spool and peak.

Bigger doesn't always mean better with cams... It is about picking the best cam for your motor, turbo, and usable rpms. However, I know that Aaron (ER), Greg (GSC), Robert (FP), and Tedb in particular all have their different opinions on what a cam "should be" on a stroked motor. This is just one opinion that will hopfully be backed with facts shortly... Hope I didn't open up a big of a can of worms because I didn't mean too. Just trying to voice some thoughts, and if other people feel otherwise please say.

Look around and don't be lazy Also Before someone says anything about Cosi cams being the ****... Aaron at ER made 26hp and increased spool over the M3s with just a std off the self GSC S2. GSC FTW

Mikey

 

thanks

 

Thanks Mike.

 

+1 GSC S2's ftw...my stock block thanks me everytime im over 6,000 rpms!

 

Mikey im not doubting you its that ive never seen back to back test on these two cams for the ix!?

 

M3 to S2...guess which the S2 is.

Hint its the one that was at 2psi less boost on the Red.



The second hint is the S2s were the last run done.

Cam to cam, while it might be close their is a definite reason I use S2 over Kelford 272s and always use GSC in general.

 

Just for informational purposes, are you refering to S2's on an VIII, or a IX in the above graph? Incidentally, thanks for taking the time to test and post!

 

Umm.... GSC S2, without a doubt....on a IX or a VIII.