trick flow heads... loss of low end torque?

gork1rogues said:

Those heads burn more efficiently and will require a different tune than what was on there with the stock heads. Go get it tuned and then see how it goes.

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tjm73 said:

You lost some port velocity when you went to the bigger valved heads. BUT you gained a lot of flow capability.

Are you still making 14 psi of boost? Bigger heads often reduce boost slightly.

3.55 gears (listed in sig) are small for a Vortech blower car.

I suspect more than one factor is at work causing what you describe.

I'm guessing that your stock heads carried you through the low rpms with good throttle response getting you into the boost where the blower took over and powered you on past where the stock heads woudl normally fall off in power.

Now that you have heavy breathing heads, you don't have that low speed port velocity that the stock heads offer and the 3.55 gears are not enough to overcome the loss of that port velocity.

Make sure you still have 14 psi of boost, get 3.73 gears and get a tune. I'm sure it'll dramatically change the car's behavior.

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