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Old 01-16-2008, 11:55 AM   #1
wittmer25
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Default Maximum AVCS Advance w/ Cosworth cams?

I had this in the built motor forum but was not getting enough info. What is the max intake cam advance you can run with the 278/274 10.7mm lift cams? Assuming an ej257, 100mm wiesco piston, .051" head gasket, usdm sti heads. I am just days away from starting up my new built motor.

Jonathon
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Old 01-17-2008, 10:01 PM   #2
john 1badSTI
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04 sti 10.51@138.5
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the cosworth int cams have -8 degrees grnd into them so you should be safe at the 20 degree avcs advance that most ecus have.the avcs advance is mostly to help spool and low end power and torque,if you look at the map it will probably go to zero at or near 5000 rpm because it will make more power up top with a little bit of cam retard---even though the map is at zero the -8 degrees ground into the cam retards you up top---i hope this explanation helps you
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Old 01-17-2008, 11:16 PM   #3
ExpO
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Honestly, I wouldn't run any more than 16 (-8 + 16 = 8) without first checking with cosworth.
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Old 01-17-2008, 11:34 PM   #4
john 1badSTI
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i have put together 2 motors with cosworth cams that are running with the maps that came in the hydras and the maps run 20 degrees midrange with no issues.one motor ina an 04 sti went 10.71 on a utec with a ur 35r setup 2 yrs ago it since has a hydra.the other one went 10.93 on 28lbs with afs at 11.7 on c16 on a shakedown pass
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