Hey everyone, just wondering who all is running aftermarket cams.. Wat grinds? I've been looking at the zzp cams. I'd like a good lope at idle but good performance also.. Thanks for the information.

 

A loping idle on a turbo car is the last thing you want or should have.

 

Far as i know ZZP is the only option

 

Why is the loping from cams the last thing you want? I have a friend and his evo lopes big time. Sounds amazing and runs great.. Why do you say that it's bad?

 

I no our motors are different from the 4g but cams are always good if tuned right. The lope is just a good side effect.

 

No, actually the lope is never a GOOD side effect, it's something that has to be dealt with when running a big, high overlap cam on an NA motor without VVT. The lope is because the motor is not running efficiently, why would that be a good thing, except for the fact is sounds good. Cams are a compromise on every application. Loping idle on an NA motor just means that the builder or owner wanted high rpm power AT THE EXPENSE OF low rpm power and drivability. That's not a "good" side effect, that's a compromise.

You absolutely would not want big overlap on a turbo motor, so there is no reason to have a cam lope at idle on a turbo motor with VVT.

 

ricers haha

 

Some people buy cams mainly because it sounds cool. And you say it's running inefficiently it's at idle, my car runs in the 17s at idle, technically thats not efficient, efficient would be 14.7-15. And with a high end cam it will help not spinning as much coming off the line.

 

And the peanut gallery comes in with 'ricers haha'

 

I just installed the ZZP cams and they are great so far. The car is just as smooth driving as before.

 

Miller thats what I have heard. Alot of people really like the Zzp cams. I was juast curious If anyone has tried running big cams.. But from what gmtech is telling me people probably won't because it's not good. So I guess we will see.

 

Right. And as of right now the Stage ones are the only ones out, stage two are in the prototype stage still.

 

Supposedly you cant get a loping effect on our LNFs. That's what I just read.

 

Rly?? Hmm that's interesting seeyaa.. I don't really care about the big cam lope I was Just curious and wanted to see wat people were running. Im not into the looks and sounds sweet but is slow, I would much rather have the typical 'it's just a cobalt lol' response and get the WTF look wen I blow past them. Lol

 

As GMTech pointed out, loping isn't actually a good thing. It is a side effect to running cams with a lot of overlap. The reason the engine lopes is because there is very little cylinder pressure at low engine speeds due to the valve timing. The engine is basically struggling to stay running instead of running smooth like normal. Of course this lumpy idle has become synonymous with horsepower, so most people usually agree that it sounds good.

In the case of the LNF, we have variable valve timing, which means that we can adjust the cams for strong midrange and high RPM power, yet remove all of the overlap at low engine speeds in order to maintain a smooth idle. This is why you don't see LNFs with lumpy idles.

On the flip side, variable valve timing can be used to make a motor with relatively short duration cams still lope at idle, which of course would be only for show. However, the LNF engine doesn't seem to have enough oil pressure at idle at move the cam actuators from their base positions. They pretty much always return to their base settings any time the engine is idling. Unfortunately, for those looking for a lumpy idle, the base settings result in no overlap, and therefore no lope.