I went to car shops and they told me 272intake and 264 exhaust is better for my street/race car, but online shops said
264intake and 272 exhaust........ Which is better, whats the difference, and why?

Note: 264's are to quite and 272's are too agressive

thankx

 

EDIT: Please only expert and experienced votes

 

Well in the stock configuration the inlet cam has a higher duration and lift so it seems obvious to me that it should be 272inlet and 264exhaust. This is how it is used in the UK with good results.

I must say I've never understood the logic of the exact opposite being used 264i and 272e which is popular in the US.

 

Wouldnt it be redundent to have more flow on the intake side than the exhaust side which pushes the turbo? More flow is what turbo cars are all about. You would be restricting some of the flow by inducing a smaller exhaust profile of the cams. Just think about a funnel the top you got your intake and the bottom is the exhaust as it flows through , the inlet gets enough air but the exhaust port can only let so much through. I would think that by doing it with that config 272i 262e you would also get some overheating issues as well. I could see maybe a small gain in torque but the hp would be hurt in the process.

 

damn u guyz both have good points, well i guess ill just wait for more debates....so i can choose my setup

 

some experts you were talking to

if 272/264 or 264/272 were better
wouldnt hks and others make them that way?? just get 264 or 272 and stop experimenting on your car

 

they sell their CAMS seperatly, they dont sell them as a package...you choose the setup u want.... Thats y i asked for expereinced or expert advice......u must not know a lot about cams... go to Road Rage Engineering and read what they say about the cam setup then go to a real aftermarket car shop and they will tell u the exact opposite......If i go with experimenting on my car worst case senario it would be not as bad as getting a set of 272's cuz some people are having crappy idling

 

I just got some 264in 272 ex I ve been told that its a compremise between the both. 272 dont idle good but you will have excellent top end. And if you upgrade your turbo its a wrap. 264 are good but not agressive as the 272. It will idle good for sure.

 

did u install ur CAMS, how did go?????

 

To add to this, Dave Buschur found that the intake flowed rather well but the exhaust side needed
work. So using a cam with the longer duration would probably help out on the exhaust side.

 

Did you read this?

https://www.evolutionm.net/forums/sh...threadid=74284

The stock turbo seems to have a lot of back pressure, so having a lot of overlap/duration on the exhaust only seems to allow some of the hot exhaust gases to revert back into the chamber. This is probably why the 264/264 combos seem to make the same power as the 272/272. With this in mind I could see how the 272/264 combo might work better.
However. if you get a set of adjustable cam gears and set them properly, you don't need to worry about using two different cam durations. Then if you get a bigger turbo later on you readjust your gears and your good to go!

 

yes just go with HKS 272/272, i don't see why you should go with a different setup

 

get cam gears and set the 272/272 to -4/-1

then no idle issues and more power (so says the Silver Surfer )

-shahul

 

If I rememebr correctly David Bushur talks in one of the threads on his modified heads about the exhaust side on the stock head being somewhat inefficient. A longer duraration exhaust cam may make up for that to some extent. Also raises the question to what extent backpressure is attributable to the head and to what extent to the stock turbo.

 

So wait, if the flow AIR is good and the exhaust flow is horrible wouldn't it be logical to have 264/272???? cuz if i get 272/272 then one is gonaa be better than the other??