HKS 272/272 cams and idle

[jdmawd]

I just wanted to make a quick post in regard to some of the myths about 272 cams idle and street ability. My car idles dead nuts at 750 rpms with these cams. fuel control is handled by the HKS VPC and Apex SAF-C. My vacuum reading at idle is -11-13" with no fluctuation of idle no stalling or loss of power during normal city and spirited driving. The cams idle smooth and if you did not know what to listen for, you could not even tell the car had cams. My valve train is stock with an 8K rev limit. Head mods consist of Magnus intake,HKS cams with AEM cams gears. Also the cams have not been degreed as of yet.

 

[1LE]

Cool.

My idle is all over the place with the 264/264s and VPC... Generally hovers about 900rpm, likes to suddenly die though. Especially if you do something crazy like turn on the A/C or turn the steering wheel while parked

 

[jdmawd]

Originally posted by 1LE
Cool.

My idle is all over the place with the 264/264s and VPC... Generally hovers about 900rpm, likes to suddenly die though. Especially if you do something crazy like turn on the A/C or turn the steering wheel while parked

.


I had all those issues with stock cams. My resolution was grounding the 02 sensor and replacing the throttle body with a factory new one.The ISC and shaft seals were toast

 

[WhipmastaFlex]

a local guy down here in So Fla is running a pair of HK$ 272s with a FP Red and idles at 1500rpm with -19" vaccum

 

[DELTA_Rotary]

I just ordered my 272s. We will see what they are like with my L3R. I very curious to see how much I pick up on the dyno.

 

[leet]

I wonder if my TB is screwed up/not adjusted correctly, because my idle is really lopey w/ 264/272 combo.

 

[jpolizo]

Originally posted by leet
I wonder if my TB is screwed up/not adjusted correctly, because my idle is really lopey w/ 264/272 combo.

There's some pretty good info on VFAQ that relates to cleaning, testing, and fixing the TB.

http://www.vfaq.com/index-main.html

 

[leet]

awesome. thanks jpolizo.

 

[DSMu4ia]

Cam timing has the most to do with bad idling cams.

I would think basic intake leaks would have been covered WELL before you put in a set of cams (tb shaft seals), and ISC motor problems should surface well before you put in cams as well.

Timing can be thrown off by cam gears, head milling, block decking, headgasket, etc.

So basically what I'm saying is..

:GASPS: :GASPS:

GET THE CAR READY FOR THE MODS BEFOREHAND, OOORRR MAKE SURE IT'S IN 100% TIP TOP SHAPE BEFORE TOUCHING IT.

...and you guys wonder why you drive pieces of wood.

 

[Awdboost]

I idle at 800 with 10 psi vac. The car runs great except for it does have a little problem with recovering sometime from dropping at higher RPM. In rare times, it will dye. But I love how it sound and preforms. But to see any benifits of the cams you will need something bigger then a 16G. My car with a Green Doesn't come to life untill 6K then it redline at a blink of the eye.

 

[irn__man]

Originally posted by jdmawd
Also the cams have not been degreed as of yet.

jdmawd,

Are your AEM Cam gear still at zero for you HKS 272 cams? Old post I know, but I was just wondering.

fwm

 

[jdmawd]

Originally posted by irn__man
jdmawd,

Are your AEM Cam gear still at zero for you HKS 272 cams? Old post I know, but I was just wondering.

fwm

yes they are

 

[nowayout]

It's depend on car and sometimes luck. i couldn't get it to idle with Crower stage 3 cams. I had a vpc safc 2 AND tmo ecu. Thank god rid of all my piggy back.

Now I have a AEM EMS So it's not a problem any more .

Will never look back agian.

 

[nowayout]

Originally posted by jdmawd
yes they are

Cam gear are a waste on HKS Cams they recommend to be set a Zero antway's.

 

[sarge]

i'm seriously considering picking up the hks 272's for my 50 trim gs-t

does anyone know where someone has actually dynoed the difference and can show the actual gain?

 

[4ged4G63]

your dying from rpm's dropping could be because of an old IAC or Idle Air Control module.

Originally posted by Awdboost
I idle at 800 with 10 psi vac. The car runs great except for it does have a little problem with recovering sometime from dropping at higher RPM. In rare times, it will dye. But I love how it sound and preforms. But to see any benifits of the cams you will need something bigger then a 16G. My car with a Green Doesn't come to life untill 6K then it redline at a blink of the eye.

 

[dsmturboawd]

Originally posted by 4ged4G63
However I also suspect it was because of the JUN flywheel,

flywheel was the first thing that popped in my head.

jdm, thanks for making this thread so i can just link this to the locals rather than trying to explain to them that agressive cams shouldnt make your car idle like complete shit.

 

[Got Grip]

I took a little vid of my car idling at 850 with HKS 272's:

http://people.clemson.edu/~nanthon/exhaust/DSCF0276.avi

It's a little lopey but overall not too bad. On the rare occasion, I do have the car stall, but I attribute that to the combination of the Fidanza Flywheel, Tial BOV Venting and MAFT.

 

[dsmturboawd]

pop pop pop pop backfire flame pop.

 

[jdmawd]

Originally posted by dsmturboawd
jdm, thanks for making this thread so i can just link this to the locals rather than trying to explain to them that agressive cams shouldnt make your car idle like complete shit.

No problem since I created this thread almost a year ago. I have 720's and a 720 vpc chip. The car still idles within the service limit of 850 rpms. wideband shows an a/f ratio of 14.5:1-14.7:1 at idle.

Large injectors and cams can and will idle perfectly. As long as you have a properly working o2 sensor, isc tps and no vac leaks after the throttle body.

 

[Rick@AP]

Originally posted by nowayout
Cam gear are a waste on HKS Cams they recommend to be set a Zero antway's.

Please don't go spreading hearsay and rumor unless you have verifiable information to back up your statement.

 

[dsmturboawd]

Originally posted by jdmawd
No problem since I created this thread almost a year ago.

wow didnt even realize. probably cause a year ago i was too interested in o2 dumps and researching the biggest fmic's i could find.

well im glad it was brought back from the dead anyways.

 

[GeneralChaos]

I know this will sound really dumb but I have to learn somehow, so im wondering if those 272 cams make it so you almost have a powerband? because charts on some cams say they work in certain rpm ranges, and id rather not have a honda s2000-ish powerband.

 

[GSTdOff]

Whats a VPC?? What does it control?

 

[jdmawd]

Originally posted by GSTdOff
Whats a VPC?? What does it control?

Speed density system used to remove the mass air meter usually associated with crappy idle and throttle response. Its a global fuel computer that spools the turbo fast and make lots of power compared to other mass air meters and hot-wire transfluxuators.