Cams

[Talon2z]

What is the appropriate duration combination for HKS cams on a daily driver? Assuming the following modifications have been done: exhaust, DP, IC piping, Fuel pump, Boost Controller.

 

[dsmturboawd]

dont bother until after a turbo upgrade. you'll lose power with them now.

cams should be one of your last mods.

 

[herostar]

to answer your question...
264 intake cam
272 exhaust cam

 

[Talon2z]

Thanks for the info. I know it seems strange to do cams first but I'm having the head gasket replaced and was just going to go ahead and have the cams put in at the same time. I'll be upgrading the turbo, injectors, and intercooler in the near future so I think I'll be able to deal with the power loss for the time being.

 

[dsmturboawd]

Originally posted by herostar
to answer your question...
264 intake cam
272 exhaust cam

how can you possibly say that without having a clue as to what turbo he plans on running?

 

[SoSprayMe]

Originally posted by dsmturboawd
how can you possibly say that without having a clue as to what turbo he plans on running?

Couldn't have said it better myself. But it seems hes running stock turbo? So stock cams are the way to go.

 

[herostar]

Originally posted by dsmturboawd
how can you possibly say that without having a clue as to what turbo he plans on running?

This seems to be what most people choose. It is proven to make power on almost all setups. There is a dyno comparison link floating around here somewhere and the 264/272 combination is clearly the best for most upgraded turbo's unless you are going to a huge turbo. For what his application sounds like it seemed to be the most logical answer. Are you suggesting he buy all the sets of cams there are and test them all to see what works best for him?

 

[SoSprayMe]

Originally posted by herostar
This seems to be what most people choose. It is proven to make power on almost all setups. There is a dyno comparison link floating around here somewhere and the 264/272 combination is clearly the best for most upgraded turbo's unless you are going to a huge turbo. For what his application sounds like it seemed to be the most logical answer. Are you suggesting he buy all the sets of cams there are and test them all to see what works best for him?

Eh to be more accurate, having a higher lift/longer duration exhaust cam will result in a higher likelyhood of detonation. That doesn't help in performance. And don't try to say that that cam selection is good for every setup or even most setups. EVERY setup requires it's own personal airflow. So my advice to you, hero, is to read and listen to the rules. Don't answer a question with a guess, if you don't know don't answer. Best of luck on your future postings.

Good day,

 

[Violater101]

I would agree that for most applications where your looking to make high 300's power wise, that the 264 272 setup would be the way to go. I believe they have the dyno comparison up at www.automotosports.com . The turbo they were testing this on was a 16g. For this sized turbo, I think the straight 264's was a better combo, but the split combo wasn't that far off and would definately be the choice on a larger sized turbo such as a t3t4 or 20g etc. Spoolup is slightly slower, but the top end is great. I have the 264 272 setup on my car. Just my 2 cents.

 

[Talon2z]

I'll actually be purchasing rre's PTE SCM50. I took a look at the cams comparison and the 264/272 combination appeared to be the best for the 16G. Will that change, as the turbo of choice in this instance is bigger than the 16G?

 

[Violater101]

Not really unless you plan on revving the car past 7500. The 272 intake doesn't really start making its big gains until after 7k if i'm not mistaken. I would say thats more of a race only application unless you do alot of cough highway topend racing cough, but thats illegal

 

[Mike 99GSX]

I made 395whp at 22PSI on a 50 trim using the 264/272 combo on an otherwise stock 2g head last year. That would be my first choice if you don't see yourself going to a bigger turbo anytime soon.

 

[STECARS]

for a daily driver/street/occasional strip car 264 /272
If your car isnt any of above and is only a track/racecar 272/272
I say this becuase of possibly idle issues with 272/272 may be rough sometimes.The 264/272 combo Ive read in several places is best combo and is smoother.

 

[billdo_83]

For a daily driver most people go with the 264/272 combo. It doesnt idle too roughly or make the car extremmely grouchy either.

Like it was said before, the 272/272 combo is more or less race only.

 

[ImportWarrior]

i can not find the link here at work but i know i have it at home. the 264/264 cam setup was the best result on the cam dyno comparison test on a basically stock engine setup.

i dont know what the benefit of running a 272 on the exhaust side is unless your making over a certain ammount of hp and running a huge turbo.

if people are running 11.6 in the 1/4 mile with I264/E264 i dont see much reason to run anything else. i just want a solid 12 sec car.

http://www.automotosports.com/cam_test.asp

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[kpt4321]

The 264/272 combo is one of those urban legends that really isn't very exciting. It's probably like a 0.5% power gain over the 264/264 combo.

Just go 264/264 or 272/272. If you tune the car right and don't have a GayPC, then it will idle fine.

 

[SoSprayMe]

Originally posted by ImportWarrior
i can not find the link here at work but i know i have it at home. the 264/264 cam setup was the best result on the cam dyno comparison test on a basically stock engine setup.

i dont know what the benefit of running a 272 on the exhaust side is unless your making over a certain ammount of hp and running a huge turbo.

if people are running 11.6 in the 1/4 mile with I264/E264 i dont see much reason to run anything else. i just want a solid 12 sec car.

http://www.automotosports.com/cam_test.asp

IMG WAS HERE...

It's good to see someone posting unarguable facts, thanks.

 

[Tallen]

Originally posted by kpt4321
GayPC

Haha! :laugh:

 

[chrisdob30]

Originally posted by SoSprayMe
Eh to be more accurate, having a higher lift/longer duration exhaust cam will result in a higher likelyhood of detonation.

Not trying to highjack the thread or anything but why would higher lift and more duration cause detonation. Wouldn't that allow for more gases to escape along with the heat. I mean detonation is all about pre ignition and hot spots??? Not saying your wrong or anything just looking for clarity.

Chris

 

[Violater101]

For my car, I was able to keep up the power longer up to 7500 rpms without falling off as much. Perhaps that is the bigger turbo coming into play there...but like they said "With a larger turbo choice (T3/T4) I think the difference in high RPM horsepower would be more apparent and would reflect better on the more aggressive camshafts. "