[87GNX]

Originally Posted by joelster

You don't understand.

Variable valve timing in the LSx family is simply limited to advancing the camshaft or retarding the camshaft. No different than taking an old school small block chevy with an adjustable timing set and moving the key way to get it 2 degrees advanced or 2 degrees retarded to alter the power. MASSIVE difference between what the Ford engine can do, by INDEPENDENTLY moving the intake camshaft and exhaust camshaft per bank. This changes the amount of overlap. If you don't understand what overlap does, then PLEASE don't reply. The LS7 has NO WAY to adjust the amount of overlap. It's ground into the camshaft. Engines with camshafts that have a lot of overlap, will jumpstart the intake event by taking advantage of the phenonenom that some call the "exhaust induced intake event". Basically as the exhaust is rushing out of the cylinder at a VERY high rate of speed, the intake valve is opening and the pressure wave of the exhaust helps to pull the fresh intake charge in.

Go to the drag strip and watch the nasty V-8 N/A cars run. They will have camshafts with 240+ degrees of duration all ground on LSA's of 108 or less. That is a reason why they can rev to 7500+rpm. A lot of duration combined with a tight LSA= a lot of overlap. The Coyote engine has the ability to tighten up the LSA as the rpm's climb, and when you take your foot off of the gas it spreads it out, so it purrs like a kitten. Or if you have a special BOSS, you can run with the RED key, and it will tighten it up all the time so you can hear the nasty lope, but lose a little low rpm power.



The Coyote is a better engine. Just be thankful that Ford has no way to get 7.0L out of it, or we'd all have our hands full trying to keep up with 600hp N/A Mustangs.

7.0L coyote would have gm stunned for along time.