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You don't understand how the VTEC works... (archive)

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Posted by Ben on April 20, 2000 at 23:29:08:

In Reply to: Bad assumptions... posted by Zandr on April 20, 2000 at 13:26:45:

Most people don't understand the VTEC engine.

The VTEC engine is actually designed to get the most power over the entire powerband that it possibly can. Look at the dyno chart it has basically two plateu's, one between 3000 rpms to 6000 rpms, and 6000 to 8500 rpms.

If the honda s2000 engine were set up just like it is now(same peak hp,torqe,rpms) but without the vtec, it would literally have zero power below 5000 rpms. Notice how the torque curve drops off sharply at 6000 rpms, if there were no vtec it would keep dropping at that rate.

On the otherhand, if it were set up with the same peak rpms but without the upper power range of the VTEC, the power would sharply drop off after 6000 rpms. In this case you would end up having zero power when at the top of the rpm range.

The VTEC engine combines the best of these two scenarios. Its like having two separate engines in one. It combines the low end of a low strung engine with the high end of a high strung engine. to get the most power possible over the 9000 rpm range.

Everyone complaines about how the S2000 has no torque below 7600 rpms. Truth is it doesn't have much torqe anywhere, and thats not because of how high the rpms are. The only reason it doesn't have torque is because its a naturally aspired 2.0 litre engine. Its like the exact opposite of the old muscle car saying "theres no substitute for cubic inches." Well they've decided to substitute cubic inches in favor of light weight.

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