Cam gears are the next best thing to totally custom-made camshafts. A good compromise.

Especially useful when your overall operating pressure ratio (intake/exhaust static-pressure ratio) is unknown or different from the exact setup your cam manufacturer used when designing the cams.

I'm sure a large part of the Evo 9's performace is the result of its variable cam engle MIVEC system. That way you can have conservative angles when cruising and aggressive angles when running hard. Good stuff.

 

Brett, he probably read his dyno sheet wrong perhaps his car was dyno'd at 3:30pm and he got the time confused with WHP as no vf39 car on any octane fuel has made over 305whp on the dyno (305whp being Sunoco 104 fueled car).

Mike

 

I tried -4/-1 like people have been saying and it was actually a little worse than 0/0 on my car. I lost low end and the top end didn't change at all, at least according to the dyno curves.

 

how much did they charge for the cam install? im thinking about upgrading to 280's. also what did you use to tune. i get my safc tuned by gruppe-s. i guess the 10.5 on the 05's really do make a difference.

 

I tuned it with a ECU plus: http://www.ecuplus.com/

 

The only ones that claim nothing can be gained from alternate cam timings are the ones that either (1) don't have cam gears and want to feel better about not having them, or, (2) don't know how to use them properly.

I've proven to myself without a doubt that this particular application responds favorably to a relatively tight LSA, which is what you get by slightly advancing the intake and slightly retarding the exhaust cams simultaneously (as was done here). You have to be careful though because it WILL be less tolerant to detonation as a result of poor fuel and/or poor tuning.

The improvement in power seen here just from the mild change in cam timing is roughly the equivalent of 10whp and 6ft/lbs as measured on a Dynojet, and this can probably be improved further. The difference I've seen with HKS 280s is even greater.


That setting with HKS 272s makes for a smooth idle and a nice peak number, but IMO the greater lag defeats the purpose.

 

Why is that? I am still getting my head around this combo so I would love to hear why.

 

How was the ECU+ to work with?

 

Because it should be expected to generate a little more cylinder pressure in rpm ranges where detonation is most prevalent.

 

That what i was thinking too. i wanted to call him out on it but i didnt want to start anything. i just nodded my head and said "well uhhh thats pretty impressive". not to mention he said it was on 91.

 

Coming from a SAFC, I am in love with the ECU +. The ability to change timing is what made me break the 300whp barrier on this dyno.

ECU + logging is great, the logs are clear and easy to read, super fast, coupled with a external wideband wired in to log as well, and knock voltage, probably one of the better piggybacks out there. IMHO.

Once I get boost logging hooked up and once Tom gets boost control (hint hint Tom) it will be even more amazing!