Camshafts, where??? Options

[edo17982]

Hi guys!
Do you know if there is someone who produce more performant cams for 7AFE engine?
the only site I found with aftermarket cams is Import performance
which sells TopLine cams. Who know about this manufacter?is it good?
Also, does anyone know how to get regrinds, valves and springs for better performance and which are stronger than stock?

Thanks

[Kwanza]

QUOTE (kamixZR @ Apr 26, 2003 - 12:04 AM)

kwanza I think you're wrong with the exhaust mate.. My muffler shop (huge performance experience) were telling me that going 2" upto 3" on the 6th gens doesn't lose ANY power whatsoever - and they showed me some dyno runs to prove it - mainly of lancers and celicas/corollas with 2.5" and 3" systems. I was talking to them about this as I am planning on doing the swap, but want to get exhaust first. From what I understand you only have to key in the exact size exhaust on turbo cars.. although he said going with a 3" on my engine will make it sound ****ING loud

Sorry, but your exhaust shop seems to be confused. In Austrailia, I'm sure there are a bunch of turbo charged Corollas, Celicas, and Lancers, which will feel gains from large exhaust systems (2.5" to 3.0"). As far as a n/a 4 cylinder goes, excessive airflow creates very low back pressure, which is essential for the engine to function. It's sort of difficult to explain, but I'll try.

Here's a comparison: When you run/jog, you get tired right, and thus you need to breath harder, to inhale enough oxygen to get to your blood. Ok, now let's say you're running a relay in Death Valley, and then one in Aspen, CO (note the differences is elevation...but disregard heat/cold...we're talking about backpressure here). You will get more tired in CO than in Death Valley, why, because of the thinner air, easier flow, and less backpressure. I know it's not the best example, but crap...it's not easy to just explain.

Ok, back on to cars now... now we have a relative idea of what backpressure is, let's say you do slap on a 3" exhaust on your car. Your car will be pushing air out so fast, you'll hit negative psi of backpressure (if that's possible). By doing so, your car will tire and suffocate because it feels it's not getting enough air (and no...intake fans and stuff aren't enough...but forced induction is) Either way, there's a sweetspot, in the exhaust pressure than you want to try and control. Letting too much out too fast, you'll lose a lot of low-end power. Not letting enough out, creates excessive backpressure (restriction) in the exhaust.

Get it now...?

This post has been edited by Kwanza: Apr 26, 2003 - 11:28 PM