VINCE

iTrader: (1)

Say you have a 408ci motor with a 225/219 .565/.565 lsa 115 110 cam with twin turbos that flow between 55lbs to 60lbs/min each. Heads that flow as well as AFR225's. What would happen if you install a cam as big as 240/240 .600/.600 lsa 115 plus 3? Do you think you would run into a backpressure issue via the turbo's being to small for that cam? Do you think a cam closer to 230/230 would be better suited for a combo that is mainly used for top end pull racing of say Supra's...? The car is a Corvette FRC.

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The thing you have to consider is the entire combination. Personally I would not sacrifice driveability with an excessively large camshaft when the turbos can unrestrictively be brought to their limits with something more tame.

ninetres

iTrader: (35)

I learned that lesson the hard way. I just ordered a smaller cam for my car. My car made great power and pulled like a friggin freight train up top with the big cam....but it only made around 8"lbs of vacuum at idle. It was a bitch to try to tune a decent idle with the th400 and SD.

eb02z06

iTrader: (18)

I don't think a 230/230 cam is too big, especially on a 408-it should make over 12" of vacuum easily and should be no problem to tune. I look at it this way-build the motor so i makes as much power off the FI-then pump it up-seems to work out well-especially when your limited to turbo sizing and belt slip-you would be amazed what a litttle compression can do.