I plan on adding a turbo in the near future, however, I really enjoy having a lopey idle, like I have currently in my N/A setup. Now I've heard that 114-116 LSA cams are the best for boost, however, wouldn't that eliminate any lope? I'm not looking for something with a heavy lope. I'm just looking for something that others would hear and know, "That's not stock..." Currently, I'm running a CC XE 224/230 cam, .536"/.544" lift on 1.6 RR's, and a 112 LSA. It's really not a lopey cam; in fact, it really doesn't have one until I lower the idle to about 750 RPM. My ulitmate setup would be with ~12#'s of boost. So, FI experts, is it possible to have a mild lope @ idle and be a good turbo cam??

 

Can no one here answer my question??

 

When you have overlap, which helps in making more hp N/A, the boost leaks out of the exhaust valve. You can use any cam you want for the car, you just wont have an optimum performing engine. If it were me, id be more worried about making more hp, than having a certain sound.

 

Well, thing is, I'm not in it to set any records, or compete in any sort of way. I'm into fast cars because I enjoy them. When it boils down to it, I really don't care if I make a 9.6 or a 10.2 in the 1/4. I just want to enjoy my car. Besides, if I wanna go faster, all I need to do is add more boost (or better-flowing heads). My main question was how adversely would overlap affect a boosted car's power curve? I know the greater the overlap, the worse it'd be, but I'm talking something mild. I mean, is it something as simple as running 15 lbs of boost to get 12 lbs of performance, or is it more complex than that?

 

YOu can do what you have suggested, but it will perform like total S**T. That being the understatement of the year. The turbo whistle and the blow off valve will be alot cooler than some gay lopey idle. Some guys run the GM Hot Cam with blowers and it works, but not nearly as well as a true "blower" cam. If you plan on ever seeing even tens in the 1/4, then say goodbye to the lopey cam PERIOD! The lopey cam will also make the car less fun to drive. Just save yourself the trouble and have a custom grind made for your setup.

 

Some people like the sound of a lopey idle, thank you. Just because you think it's "gay" (very mature choice of words, btw), doesn't mean everyone agrees with you. All I was asking was if it was possible to have good- make no mistake, I'm saying GOOD, not OPTIMAL- performance with a MILDLY lopey cam. I'm by no means a guru when it comes to cam selection, but is the LSA the only factor that determines lope? Does the cam's duration influence the idle at all? Is it possible to have decent performance with a 114 LSA cam that has a lot of duration, or even enough space between the intake and exhaust duration? I'm confused about your comment about never seeing 10's w/ a blower & lopey cam. I've got video clips of a turboed f-body with a lopey idle (keep in mind, I'm talking mild, not like a CC306 or anything) that ran 9's...

 

I honestly feel the same way. We want the best of both worlds. I understand wanting optimal power when going FI after spending all that money, but on the same hand, it would be great to have the lopey sound.

 

Talk to bret bauer, hes the cam man he can do whatever you want, do what makes you happy. Just take everyones opinions with a grain of salt, mine included. Except about bret, you really should talk to him.

 

Thanks!

 

Actually, it's quite the opposite. A turbo motor has typically 2 - 3 times more exhaust pressure than boost. You reduce overlap in order to keep the exhaust from bleeding back into the intake air, thus diluting and heating it.

What he wants is possible (lope and turbo boost), but let me first point out that "lope", or rough idle, is not a desirable trait. Would GM, Ford, Chrysler, or any of the *** manufacturers ever mass produce a car that had a rough idle? Don't think so. All it's good for is fooling narrow-minded people into thinking you have alot of power.

That said. . . you can make alot of power with lope and a turbo. As I stated, you cut down on overlap with a turbo to keep the high pressure exhaust gas from bleeding into the intake port. You can KEEP the overlap if you reduce exhaust backpressure. This will actually make the most power by far (we're talking 1500+ hp range). If achieve the same amount of backpressure as boost, you can actually cam it as if it were naturally aspirated (i.e. 255/263 - 108 LSA) and achieve huge amounts of power. So what does it take? On a 350+ cid V-8, you would likely need a large frame turbo (T-6 exhaust side), which is the T-91 and up. You would also need a quality set of mid-length headers leading to it, a 4" downpipe, straight-through muffler, and a dump.

And by the way, even though Bret may be a cam guru, he can't bend or break the rules when it comes to cam choice.

Mike

 

Very similar to my setup, my cam is in the 250+ range at .050" with 21 degrees of overlap, pretty mild cam for some of the turbo setups out there... The original turbo cam I had on order was 268/264 at .050" but toned it down a bit.

http://kak.com/camaro/fuel/DSCN1095.JPG

 

Seems like you could still have a decently lopey idle if you wanted. I have seen the ohio boys ta and it def. has some lope to it it seems. I'm sure they got the cam cut for the best performance and not sound.

 

Rodrigues, is that the Spearco 2-230 intercooler? If so, what power level is it rated for?

 

Its rated for 1000, im sure itll see more before restriction becomes much of an issue

 

I don't know a whole lot about cams but I have seen some videos of some turbo cars that sound pretty mean. I know that some guys are putting 113 LSA cams in their turbo cars and there are a lot that use 114 LSA cams. I think some of it depends on your emission issues also. The 113 LSA and 114 LSA cams sound pretty good IMO even though they are not going to sound like the 112 or 110 LSA cams. I posted a couple of videos below of turbo cars that have good sounding cams. I don't know any of the cam specs but by the way that they sound, I very well doubt that they are 115 or 116 LSA cams. The red 35th car is a 427ci twin turbo car built by Rob Raymer at Quarter Mile Performance before they went out of business and as seen in the video, it made 1012 RWHP. The other car is just some short driving of a force induction specific LS1 Firebird with a turbo.

http://videos.streetfire.net/Player....580F&kw=37&p=7

http://video.ls1tech.com/Player.aspx...3-B1BB6946B1BE