so the power difference if obvious. but what about emissions?

Will the 272's with a flash pass emisions?

 

I wouldn't count on it. The long overlap that creates the rough idle definitely isn't doing anything for emissions.

If one has cam gears, he should be able to greatly improve his emissions profile (either temporarily or permanently) by dialing out some of the overlap.

 

hmm, thats what I thought. I was just hoping that someone has been through emission already with either cam choices. I live in MD, and we have emission every 2 years. So, I definatly dont want to choose a set that I will have problems with in the future....

 

if you have a stock cat or a high flow cat, yes it would pass. All depends on your state of course. If a test pipe, nope.

Lots of states are now using just the obd2 port, and no sniffer anymore...makes passing a breeze

 

the 280's are a nasty emissions cam. but most peeps just get plugged in through the obd2 port, so not a big deal unless the operator notices the lumpy idle.

 

First off, I haven't heard anyone else that has a white rabbit say anything about what works for it. Everyone says that the 280's help pull all the way to redline. The wr does that already.
Not to knock you guys, but in my opinion, what you want is a deeper breath, not longer. I bought a set of 260 procams from Z-1 for that reason. No they aren't in yet, still working on gathering parts to make it happen.
Over the years I have built several engines and have found that high lift will add power in a way that more duration/overlap only wishes it could. Yeah, at 11.5mm lift I won't be able to run it up to 8500rpm, so. I have no desire to go there with the stock bottom end anyway.
After I get them installed and tuned, I will post the #'s, but I have to tell you, I have done my research and HKS is much newer at the 4G63 than Tomei and Piper, this aint no Honda, boys.

 

there is an excellent article on cams in this months D Sport. Alot of you guys could learn alot from it - very highly recommended

 

I have been searching on the 272/280 combo and not finding to much info. I plan on running TBE, K&N Drop IN, MBC 21-22psi, '05 evo turbo, lower IC, fuel pump, STOCK CAM GEARS, and custom flash. I have had 272/272 in my '03 Evo but im looking for a little bit more so im thinking the 272/280 seems like a good choice on a stock turbo/head.

 

264/272 all the way, on our cars the bigger the better is not always the case.

 

bump
subscribed.

WADAD

 

i agree, our 280's aren't very bad on idle. if the idle is too lopey, i'd check the timing belt..

however, be very careful with such a high lift cam on the pistons/headgasket. i just got a chance to disassemble our stock engine and noticed a few valve kisses on the piston( hks 280's)
could also be due to spinning her upto +8500rpms on the stock valvetrain

ken

 

You guys do realize that the 280 intake cam has a lower lift than the 272 intake cam. As for reving I would think they would both have about the same risk, if not it would be the duration causing the tollorance problem and not the lift. 8500 rpms is quite high on stock springs regardless.

 

I believe that to be a missprint, and all three HKS offerings probably give the same lift.

 

Wow I had no idea, thanks for the info.

 

I just sat here and read this thread and I think it's important to those posting or thinking of posting that the creator is looking for input as it applies to the WR turbo. She doesn't run out of breath quite like the stocker. But she's not built for 9000 rpm pulls either, I don't believe.

Personally, I'm running 264/272 and she's strong as hell. I'm curious about what a cam upgrade might do but I'm running a "stock-size" turbo not a huge monster.

There was a thread here re: a Swytzer car (???) with the WR and 400 hp or so. I was curious about that build and if anything else had been tried.

Any WR or '03 stock turbo specific input on cams here folks?

Thanks!