The 1989-1993 generation Honda Integra bears the code E-DA. This is the most important generation of models in Honda's history as this is where the legendary VTEC system was introduced. The very first VTEC engine was the 160ps version of the DOHC VTEC B16A and the very first model to use this engine was the DA6 Honda Integra RSi/XSi, first introduced by Honda in April 1989. Thus as the official JDM Honda factory manual for the DA6 states, the first VTEC engine in the world is a B16A bearing the serial number 1000001 and was used in an Integra RSi or XSi which beared the chasis serial 1000001 !

There were two main variants of the top DOHC VTEC model, the RSi and the XSi. The RSi was the base model without any options, while XSi was the full options variant with climate control and optionally sunroof and ALBS. This top ranked DOHC VTEC model was complemented by more docile models that uses dual-carb'ed or PGM-Fi versions of the versatile ZC engine but in the more compact SOHC configuration. Similarly there were base and full options variants of these SOHC engine Integras coded RX/RXi and ZX/ZXi respectively.

In 1991, the range received minor cosmetic changes. More significantly the B16A engine was enhanced to current generation specs; 10.4 CR, wilder cam-profiles; producing 170ps. The 1991 revision also saw the introduction of the first 1.8l engined Integra. The DOHC (non-VTEC) B18B was first used on the 1991-1993 Integra ESi where it produced 140ps.

An interesting fact about the 1991 revision of the DA-Integra is that it is relatively unknown ! Most publications, even japanese, focus on the original 1989-1991 line-up as it is more famous and popular. The specifications and model line-up for the 1991 revision are obtained from the japanese Hyper-Rev magazine. The RX/RXi models were listed as being deleted from the line-up and the 1.8l ESi model added. While I cannot confirm the correctness of this infor, I can confirm that the 1.8l ESi do in fact exist since I've checked a real example up-close. What I do have some reservations though is the gear-ratio data for the 170ps B16A which are identical to those of the EG and current EK-series Civics.

The specification data here are from two different sources. The 1989-1991 line-up data were obtained from the official Honda JDM catalog for the Honda Integra which will therefore be absolutely authoritative. The specs for the 1991 revision as noted are sourced from the japanese Hyper-Rev magazine which is a non-Honda source so I cannot confirm their absolute accuracy.

Source

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