im looking to get a mild street cam for my a4 dd and will probably be going with something with a 114lsa or greater because it my my dd and also for stealth affect.
my question is; how much power if any am i leaving on the table going with a 114 than say a 110 or 112?
anyone have a recommendation on a stealthy\quiet cam with great mid range power?

 

I expected my idle to be almost the same as stock but it does have a noticable lope to it. Maybe it's because we left the idle kind of low. (M6 750 rpm.)

It doesn't bother me, in fact, I think it sounds pretty cool.

My cam is 224/228 .581/.588 114+1. No overlap but it still lopes a lil. Go figure.

 

im also looking at a 114 lsa cam, just for better drivability, and a little more high end.

 

I would have liked to have my power come in a little lower but the 114 LSA offers more P/V clearance.

My car could use a little more gear but for now it's fine, driveability is good at low rpm. When I get a 12 bolt or 9" I will prolly go to a 3.73.

 

i know down low is where its at, but i wanted a little more high end, just because if i do race, it will usually be on a freeway going over 100+ mph anyways.. but i still may probably go with a 112

 

Higher LSA= smoother idle, "in most cases" and more power ON TOP of the rpm range.

 

Higher LSAs give you better low end power, Low LSAs give you more top end power..

 

Huh?

 

+1..... i thought it was the other way around

 

Hmmm..... Pretty sure if you flip that around, you'd be right.

 

Oh lord lol.

My understanding is that the wider LSA makes for a wider powerband, and the shorter LSA makes for a more narrow powerband. The duration, for the most part, is what dictates where the peak power is made.

Overlap (Valve timing near TDC), and which RPM the idle is set to, dictate how much "lope" you'll end up with.

JM2C

 

Patrick G will come into this thread soon...lol

 

Look in the Cam Guide at the top of this forum...I think it's got it all.

 

also matters what advance is ground into the cam from the distibutor .
114 +4 will peak lower than a 112 +0
then you have the valve events , a large duration with 109+0 lsa will out rev or produce a later hp peak than a low duration 114 especially if more advance is ground in the 114. the lower lsa, plus some advance is good for larger durations cams to get back the proper VE' s ,more DCR , and if done right will produce a flat torque curve and peak around 6200-6400rpm which to me is not to high or to low .

 

so if i looking for a cam with a mild almost stock lope i should be looking at high lsa's but if im wanting lower or more mid range power (for street driving) i should be looking into cam with a lower lsa which will lope alot more and ruin the stealth factor i was looking for. do i have that right?

 

I just read over what I wrote, and I typed is bass-akwards.. My bad..

 

that is right

 

Check out this article. It does a great job of explaining how different aspects of a cam effect performance/drivability.

http://www.chevyhiperformance.com/te..._lobe_phasing/

 

That's why most off the shelf cams are ground with a high lsa (114) with a lot of advance ground in (+4) so you get the higher peaking power and the powerband moved down a bit to utilize it. The 114 +4 element is probably also used as a safety for people who tend to overcam their car with high duration cams.

 

True dat..... I bought a nice high LSA cam for my 94Z years ago, "114". I was pleased with the power increase, but very dissapointed in the lack of lope.

Kinda sucks to do all that work to change a cam out in one of these things, and then not even be able to tell in it's in there.