thanks

 

Not meaning to hijack, just trying to get advice on this as well...

I'm going to be running the following modifications, I currently have HKS 264/272 cams on stock evo 8 turbo but I'm going to be upgrading to either Kelford 272 or 280's. Any thoughts on which would be better?? The car is not a daily driver or a straight drag car but will probably see some decent track time after the modifications. Are the 280's too aggressive for this turbo? Thanks!

Ported FP RED (ON THE WAITING LIST)
HKS Adjustable exhaust cam gear
springs, retainers
ARP head studs
Turbo XS FMIC
AMS LICP
HKS UICP
1200cc Injectors
BR Double Pumper
Evo Power Mods O2 Dump Housing
BR 3” DP
BR 3” test pipe
BR 3” catback
HKS SSQ BOV
Excedy twin cermic HD clutch
Stock ECU
Ported Exhaust Manifold

Non Mods List:

Stock intake manifold
Stock head (no porting)
Stock shortblock
Stock Turbo Air inlet pipe
Stock throttle body
Stock ignition system and coils

 

Kelford TX272 11.00mm lift in / 11.00mm lift ex

Cosworth M2 11.00mm lift in / 11.00mm lift ex

Supertech single springs and retainers

All in stock ready to ship. Direct distributor of all of these lines.

Send us a PM for pricing.

 

GSC S2s man, easy choice. For the price and power you get, theres none better.

 

M2's FTW dont consider no others

 

Actually, the JUNs are a mild lift cam with long duration, and that works well with a large turbo and a factory head. They will work just fine with upgraded springs and retainers.

The GSC S2s also work well with a large turbo an unported head, but they are better suited to take advantage of a ported head than the JUNs. The GSCs should be a little more forgiving than the JUNs for street use.

The Kelfords have slightly less duration than the S2s and JUNs, and the M2s a bit less than the Kelfords. Both should be good with either small or moderately large turbo, and will work well with a ported head.

From cam specs (lift, duration, and lobe centerlines), this is how the picture clarifies itself:

<----(shorter)----------------Duration-----------(longer)------>

<----------- M2-----Kelford 272 ---- GSC S2 ---- JUN --------->

<----(factory)---------------Turbo Size ---------(large)-------->


This is only an indicator of what the profile seems designed to accomplish.

The HKS 272 is a very forgiving cam that works well with factory head and valvetrain. It's a good street cam, but is outclassed when it comes to a serious power effort.

 

^^ you really think the M2's are on the "factory" side of your graph compared to the kelfords and the s2??

 

The M2s have about 20 degrees less overall duration as compared to the others, and a relatively advanced intake cam centerline. It looks to me as though this cam is designed to be matched with their head, work with a variety of turbo sizes, and emphasize street performance as opposed to all-out peak power (e.g. drag racing work).

 

For those with a ported head and upgraded valvetrain, the S2 would be a better choice than the Jun?

 

The S2 can do one thing that the JUN cannot, and that is take advantage of a competently ported head - a head that can flow more air with greater valve lift. With a factory head, the extra lift won't make a difference.

 

So, Ted, which one would u prefer on a factory head with a Red between the GSC S2s and the Kelford 272s on a 8?

 

i run the JUNS and LOVE them if u can afford them get them i paid $800 for mine and they make nasty tourqe and power on a evo ix just talk to 9sec9 he runs them and highly rec them and the aggressive ilde???? that all about your tuner he can tune them to idel nice if not perfect my idel is great. i run the juns with headstuds, springs, retainers and pulls to 9,000 k no prob

If i was you i would get the the juns!!!!!!! i did alot of "homework" before i got cams for my 9 and jun is the way to go

JUN FTMFW!!!!!!!!!!!

 

tell me why jun cannot take advantage of a ported head??????

 

The specs are so very close that there is no clear answer from my vantage point.

 

It can only as far as its lift, which is 10.8mm. This is about where a factory head goes dead, which leads one to believe that the JUNs were designed around a factory head.

A competently ported head will see greater airflow beyond 10.8mm lift. Cams like the GSCs and Tomei are able to take advantage of this because they give greater lift.

This doesn't mean that the JUNs are not capable cams, because they certainly are. What it means is that for certain setups, there is room for improvement. As to what difference this makes when the rubber hits the road depends upon a variety of things.