What was the first year Honda introduced vtec?
from wikipedia....
Honda introduced vtec as a DOHC system in the 1989 Honda Integra
and Civic CRX SiR models sold in Japan and Europe, which used a 160
bhp (119 kW) variant of the B16A engine. The US market saw the
first VTEC system with the introduction of the 1990 Acura NSX,
which used a DOHC VTEC V6 with 270 hp (200 kW). DOHC VTEC engines
soon appeared in other vehicles, such as the 1992 Acura Integra
GS-R (B17A 1.7 liter engine). And later in the 1993 Honda Prelude
VTEC (H22 2.2 liter engine with 195hp) and Honda Del Sol VTEC (B16
1.6 liter engine). Honda has also continued to develop other
varieties and today offers several varieties of VTEC: iVTEC, iVTEC
Hybrid and VTEC in the NSX and some Japanese domestic market
cars.
http://en.wikipedia.org/wiki/VTEC