what is the majority populous have to say on this topic? what have been the pros versus the cons. I understand that you tune the cams for hidden power (not necessarily get anymore), its either more power and less torque or vise versa?

what have been the (or your) experiences with the Cam gears on the IX (exhaust)? My feeling is that it would be a plus in my current setup? any feed back would be greatly appreciated.

 

don't exactly know what u are tryin to say but i think ur asking if u should buy cam gears for more power. the answer is no (on an evo 8 atleast.) the timing can be adjusted very easily with a laptop so therefore u do not need the ability to change it on the engine.

 

Ignition timing and cam timing are two completely different things, on the 8, you can move the power curve around a bit using cam gears, maybe make a bit more peak power or make a little more torque down low... some people do not run them for fear the adjustment screws may come loose and let the gear move on the cam, possibly destroying the engine.

The Mivec on the 9 may be what you were thinking of, where the intake cam is controlled by the computer, making changes to the cam timing while the engine is running to maximize power at a given rpm.

 

EatSleepBoost: You're mixing up cam(valve)timing with ignition(spark)timing!Also, adjustable cam gears are more widely used in VIII's than they are in the MIVEC Evo's.

 

oh i am sorry. i was drunk when i made that post but now that u have cleared it up it makes more sence. i am sorry for the not fully factual post.

 

To the OP, is there something you're looking to get out of the car that it's not doing now... ?

The exhaust cam gear may give you some adjustment of the power curve, but probably not a big change.

 

If the lobe centre line of the camshafts you buy is different from stock then you need cam gears to set it up properly.

 

the lobe center on the Cossie M2 exhaust is 114,
http://www.vividracing.com/catalog/p...aftcamcard.pdf

Does anyone know the stock 9 exhaust centerline?

 

well I am trying to get as much power out of this setup without having to sacrifice any of my torque. I feel that power wise there is alot more to be made or am I being unreasonable to believe that? Ideally I was hoping to see a whp of 380-390 and wtq of at least 360. Remember fellas I'm here in SoCal home of the worse 91 octane in America!

 

I'm about where you are and I've arrived at three alternative choices: 1) AEM EMS 2) Alky/Meth Injection 3) ported cylinderhead.

 

Hey Sparky; I actually contemplated the same alternatives. But after fighting with myself and advise from my tuner I went with the race gas and tune. The clutch has been replaced and is going on the dyno in a couple of days for a full MS109 tune (no slipping clutch at peak this time around).

So I'm still at the cross road of getting the Cam gear (exh), because I will be using two maps, one for 91 and the other MS109. I figure the Cam gear will be helpful when running the 91 map (maybe a slight gain in whp and move the power band closer to the front end) more than the MS109 map.

I'm also guessing there is a physical adjustment to the cam gear when switching between maps? or not.

appreciate any opinions on this?

 

Have you talked to James or Alan, I know they've tuned a few with the Ex. Cam Gear and sqeezed some HP out of it. Is it worth the $$$, that is the question. Did you get any other porting (Int. Mani., Ex. Mani., Hotside) ?

 

The correct answer would be to cam gear

 

The intake valve timing (specifically the closing point of the int valve) has the greater effect on power than any other valve timing event.

In a nutshell, the simple way to go about optimizing cam timing is to set the intake cam at an LC that is suitable to the target power peak, then adjust the exh cam to give the desired amount of overlap (which affects the shape of the torque curve).

Whether to get cam gears or not depends upon the application and the cams. There are some cams sets that are timed better for street power (midrange torque), and others that compromise street response in exchange for a bit better peak power. Cam gears enables one to optimize any particular cam set to his liking.