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Old 05-10-2005, 11:05 PM   #1
hauvis
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Default Cams and cam sprocket for STI?

I was lurking around on a EVO forum and there are some posts about CAMS and CAM sprockets. This seems to be a good source of power for them.

My question is why the STI or WRX don't need upgraded cams? It must not give power increase I would assume the factory CAMS are not easily improved upon?
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Old 05-10-2005, 11:25 PM   #2
dwx
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They do give gains on Subaru, the problem is they cost twice as much as the EVO since there are 4 cams instead of 2, and they are much harder to change. To put it simply, the easiest way to change the cams on a STI is pull the engine out. As for adjustable cam sprockets, the STI uses its own electronic cam timing advance system, AVCS. (Active valve control system) So you can't use cam gears on it. The EVO guys are going to run into the same thing with the EVO IX which uses the MIVEC system.

The EVO also uses hydraulic valve lash adjusters. If you change cams on the STI it requires re-measuring the valve lash for each valve and possibly ordering new buckets. So even if you wanted to do it in a day, you may not be able to.
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Old 05-11-2005, 07:05 PM   #3
hauvis
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Thanks.
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Old 05-11-2005, 10:43 PM   #4
02Toyowrx
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http://store.dprracing.com/cams/subaru/dprbillet.htm
DPR makes cams for the STI, pretty reasonable I would say.
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