The HKS 280 cams work great with the stock turbo in my opinion. I just recently got tuned by Turbo Trix and my mods are as follows:
HKS 280 cams, RS intake
RNR Racing 3" TB no cat
Fighter's Garage LICP
Hyperflow FMIC
Turbo Trix dyno tuned flash

I ended up making 356whp@6500rpm 349ft/lbs@4500rpm on 21psi 93 octane. This was on a Mustand AWD Dyno. The power is great and does not stop pulling at all. These cams really woke my car up big time. I will get the dyno sheet up as soon as I can.
On top of the power from these cams they sound very aggressive. The idle is very lopey. I think I need to adjust the idle with the AC on because it has a hard time idling with it on.

 

Did you noticed a decrease in low end torque?

 

Nice! Post up the dynosheet when possible. Any stalling with the 280s??

 

Nice power, but I made 366whp on 272's, 94 octane, Greddy Front mount, and AEM tuned by TT with a perfect idle.

 

You can't compare the power because you are in a completely different weather etc. When this guy dynoed it was raining all day and had been for the last few days so it was humid and hot. Either way both of you made good power. There is a local here with 280s on stock turbo. Ran 11.6@117 and now has made over 40whp more. He is looking to run low 11s@120 or so still on stock turbo with 280 cams. Not saying one is better than the other just that they do still work.

 

I agree every situation is different. My 03 EVO made 360 whp on a mustang dyno with BRS4 on 93 pump gas, stock turbo in 4th gear on a custom dynoflash from Al.

 

What was your previous horsepower? Just trying to messure the gain.

 

Here is the dyno chart. I don't have a scanner so this is the best I could do.

 

Seems like the power comes on late. Is it just me?

 

hooptie, come over to evony bro, we miss ya!

 

Its Just you. MAX Torque is up there in teh upper 3000RPMS and power is climbing to...

 

Great, we are not talking about AEM, we are talking about stock ECU w/ MAF meter. These are not something you should compare to. Honestly, This car with EMS could do 370-390 IMO.

You must have been the red evo with Chris from Pensacola. I heard you rode down with Gabriel. I did his cams locally Friday so he could get the flash on Sat with TT. I came late in the day about 4:30 so I guess I missed your run. I assume you went over to aerocomp though with Chris. I believe I did see you later at the races, I was the MR. Anyhow- nice tune.

 

I agree. Mines look about the same

http://tinypic.com/5xk0hi

 

my buddy put in 280's and he said he lost a lot of low end drivability? what's your take on it?

 

Different brands of dynos give different numbers. 356whp on a Mustang dyno is greater than 366whp on a Dynojet.

The 280s will behave differently depending on how they are timed. My 280s are timed such that they give much more low speed torque than my 272s ever did.

The 280s deliver more hp potential than any of the other HKS cams. They also expose the limits of the factory turbo more so than the other cams.