[jim_howard_pdx]

You should read my speed secret number three post carefully, and understand that the port runners on the EFI engines are tuned to produce a torque curve in the rpm range of the vehicle's intended purpose. So a stock engine will tune max torque to 3300 to 3500 rpm.

On a cobra, they want a longer and broader torque curve, so it is tuned to 3300 to 3900 rpm. Since horsepower is "MEASURED" by taking torque, and rpm and dividing it by a constant, you can see that the Cobra manifold is intended to shift the torque curve up higher in the rpm range, where us sports fanatics love to hang the revs. That is what generates the higher horsepower on the Cobra cars. More torque, higher in the rpm range.

If you want to race, even the Cobra intake is limited. Edelbrock and TrickFlow make a rectangular port intake good to 6,000+ rpm and capable of generating some impressive horsepower levels.

With a stock cam, and a stock compression ratio, and a cobra intake, DON"T EXPECT MIRACLES. Your computer's algorythems are still set for the stock cam profile. The computer doesn't "SEE" the intake at all, so it does not adjust richness at upper rpms to produce the horsepower the intake is capable of delivering.

This is why I do not personally build EFI cars. They are fine mind you, but when I can get 400-500 HP easily from a stroker kit and a carb, why dinker around with computers, eproms, super chips, sensors, and the like. They add 4,000 dollars to the cost of the engine and supply just a little more torque in the midrange and maybe 3-5 mpg more at street driving speeds.

I just nail the pedal and hang on for dear life....

Some like it simple .... he he he

Hope this helps and you are right to laugh about all the bogus horsepower and time claims. I add or drop more than a .1 second at the track due to bariometric pressure (weather) and track temperature!!!!!!!!

Gotta love the guys for at least responding, but take it all with a grain of salt. To really take advantage of the Cobra intake, you need a bigger MAS and better flowing ports and valves. You need higher compression. The biggest seat in the pants improvement is when you change the cam to a B or E roller cam.

All these changes together make for a 12-13 second car.