I am thinking about making the switch from 272 to 280s and I keep getting told that it is advised to upgrade the valvetrain. I know many people run them with the stock valvetrain with no prob, so I want to hear the others that ever had a problem. Also anyone that made the same switch as me how much gain did you see?

 

Dibs on your 272's . No first hand expierience but from what I hear an upgraded valvetrain is recommended

 

I have them, but went from stock to 280s. My buddy that went from 272s to 280s would not do it again if he had the choice. He did not feel like the gain up top was worth what he lost down low. He has a stock 03 turbo FWIW. Neither of us have upgraded valvetrains and have no problems. I run it to 8k.

 

If i remember right they have the same lift as the 272's but the 280's just have a longer duration. I bought HKS 280's but have not installed them yet. I did buy the Revolver springs and retainers just for some added safety for those higher rpm runs. Good luck.

 

No big probs, but to see any HP gains a built head would be in order, without it they are just glorified 272's, with no bottom end power. Best of luck.

 

Get Revolvers or JUN's. I like my 280's but I still wish I went with the more aggressive cams. If you are gonna go, you might as well go all out. Just my 2 cents.

 

You might try just the 280* intake cam first, and get a set of adjustable gears. As far as there being no power difference between straight 280's vs. 272's, the Buschur Dynothread showed no power loss anywhere across the RPM range, even down low.

 

But what were the mods on that car. It definately wasn't the case for my buddy and I'd be willing to bet I could gain power by switching to the 272s.

 

I won't argue with you Robert. In fact, I didn't like the felt loss of midrange power with my 280/272 HKS cam combo when it was originally installed at -3/-3(or 0/0, for that matter). It was only since I went to the +2/0 setting and now +1/-1, that I felt enhancement in the midrange and upper-midrange power.

I just remember being surprised when I read Dave Buschur's comment about not experiencing a loss in power at any point on the dynochart when he swapped in the 280's in place of the 272's, in that Dynothread way back when.

I personally wouldn't run the 280's on the street w/o adjustable sprockets and that's probably why I went with the 280/272 combo. My reasoning being, true or not, that I would be hedging my bet and keeping a bit more midrange power with the 280/272's vs. the straight 280's.

Yeah, for the street, I too would go straight 272's or 272/264's vs. straight 280's anytime. It's only since I've been running TedB's advanced cam settings that I have come to reconcile myself(barely) with the 280/272 combo. FWIW, my friend with a JDM RS with stock cams comments that my car has more stump pulling torque on an uphill roll from 2000 RPM in second and third gears than his Evo.

I just thought that since the thread starter already has the 272's he could purchase just the one 280 intake cam and with a set of adjustable gears, dial it in to have similar, if not more, midrange than an Evo running straight 272's or 280's set at 0/0.

Also, since I noticed that he has the AEM EMS I thought he could tailor the fuel and timing tables to enhance midrange and upper midrange power even with the 280's and adjustable sprockets or a 280/272 combo.

 

I have 280s on an otherwise stock engine. I havent had any other cams in there except stock so Im not sure if the 272s are better or whatever. But I chose the 280s based on an on-going build that would eventually take advantage of the 280s.


My only complaint (and it's a stretch) is that sometimes the car dies when I push in the clutch. raising the idle helped, but did not remedy the situation.

I chose my cams based on several conversations with TedB and Dyno4mance. I run them at 0/0 based on Andrew's recomendation, however Id like to try the +2/0 or +1/-1 jsut to see if I like it better.

 

I had my cams at +2/0 up until last week, now they are at +1/-1 which seems to give me a bit more midrange and upper end power than the +2/0 setting. I won't be going back to the +2/0 setting as I really like this +1/-1. Today I'll try 0/-2 just for comparison's sake. Then I'll make up my mind once and for all before putting a drop of blue threadlocker on each cam adjustment bolt, and sealing the thing up for the forseeable future.

On my car +1/-1 idles smoother than +2/0, which tended to die out on occasion. Of course your experience with the straight 280's will probably differ somewhat from mine with the staggered setup.

 

look into kelford i gain 27whp on a dyonodynamice