DA Integra

Befittingly, the DA6 & DA8 became very popular and even till today, there are still many satisfied owners happily using their Integra XSi & RSi. Subsequent VTEC Hondas, especially the EG6, DC2 and of course the mighty Type-Rs have hogged the limelight but the DA6 & DA8 Integra will continue to hold a unique, very special place in Honda's history as the first VTEC-Honda.



The top-end Integra XSi/RSi was produced from 1989 till 1991 before receiving the 2G 170ps B16A and a very mild body revision. As a result, XSi/RSi with the 1G 160ps B16A are now already in their second decade of use. How well will they hold up to age ? Of particular concern would be how the 1G B16A itself will perform after more than 10 years of use.



In this new TOVA series, I will focus on this great model in detail, paying special attention to the question of how well 1G models are lasting their age. We start off this series in typical TOVA style, by looking at a relatively stock model.



Stock New Zealand Registered Integra XSi



Tamati who lives in New Zealand is a regular visitor to TOVA and credits me for giving him a lot of ideas for modifying his recently purchased pre-owned 1991 DA8 4-door Honda Integra XSi. The car was originally a used-import from Japan, re-registered in New Zealand and Tamati bought it over from the first New Zealand owner. In his email, Tamati told me he recently dyno'ed his car and sent me the dynochart. This started off a sequence of emails that provides me with the perfect set of materials to examine what a relatively stock 1991 Integra XSi, well looked after and in excellent condition, is capable of doing.



In terms of "modifications", Tamati's added the following to his engine:



K&N FilterCharger Air Filter

Resonator removed, replaced with a custom underbody ram-air pipe

Throttle body heating by-passed

Engine timing advanced by 2 degrees (to 17 degrees)





The K&N filter is a direct replacement drop in model - remove the original stock panel filter and put the higher flow K&N in. The higher flow is claimed to enable more air into the engine, thus enabling more power. But a rather more significant mod would be the removal of the resonator as that would really help in high rpm air-flow. But even including the K&N filter, Tamati's modifications to the engine are in actual fact very mild so the engine itself can really be considered relatively stock.



This stock "status" carries over to the rest of the car. The suspension - springs and shocks are standard but as with all enthusiasts, the wheels are replaced with larger 15" x 7" Ensure Racing wheels and 195/50VR15 tyres - stock DA8 tyres are only 195/60 HR 14 so the larger rims are popular to add an aggressive look to the car.



In the well-kept interior, MOMO items replaced the stock steering wheel, shift knob and harness pads. The shifter itself was changed to a Dynamik Tuning Adjustable short-throw shift. An A'PEXi Rev SpeedMeter (RSM) is supplements the stock JDM speedometer (which stops at 180kph) showing vehicle speed in digital format. The RSM can also do standing start acceleration timings; 0-100kph, 0-400m, etc as well as lap-timing. Also very apparent from the photos, Tamati's DA8 interior is in exemplary condition - certainly not looking at all like it's gone through 10 years of use !



The Dyno-Pack Dynamometer

Tamati's car was measured on a New Zealand designed DynoPack dyno. I first got to know about the DynoPack from Doug (of HONDATA fame). The DynoPack works along the same principle as the DynoJet but instead of measuring power by having the wheels turn a huge drum, the driving wheels are removed and an electrically retarded measuring device is mounted directly to the wheel lugs. DynoPack claims an extremely high sensitivity - the ability to measure the apparent loss in power when the car's headlights are switched on !



The dyno run itself was conducted with the bonnet down and a large fan blowing air against the front of the car. A lot of enthusiasts feels that this is more representative of the actual air-flow conditions that the car will experience in real life. Nevertheless I personally feel this method of dyno-ing will give a less than absolutely accurate reading because I think that a fan will never be able to generate air-flow equivalent to that when a car is moving at speeds of up to for e.g. ~140kph (the speed equivalent to 8000rpm at 3rd gear on an Integra XSi).



It was also raining at the time of the dyno run, which was conducted in a workshop with the roller doors open and an outside temperature of about 16-17 degrees Celcius. The low ambient air temperature will give a beneficial effect to the absolute power output from the car (irregardless of the SAE corrections), maybe as much as 3-4ps! The car was running on RON-98 petrol for the dyno-run.





The Dyno Result



The DynoPack registered the following results :



Peak Power = 101.2 kW ( 137.6 ps ) at 7584rpm

Peak Torque = 133.8 Nm ( 13.6 kg/m ) at 6968rpm



As we have seen from our Civic series, a 1st generation B16A with a manual gearbox will be expected to dyno at 160ps less 15% power loss due to the gearbox. This of course works out to 136ps at the wheels. Tamati's car dyno'ed at close to 138ps at the wheels. While the engine's power output benefits from very low ambient air temperature, dyno-ing with the bonnet closed will degrade power output so the two conditions will actually neutralize each other. This means the minor mods to the engine will have a nett though very small effect in increasing power output. With some nett gains expected from the mild mods, the 138ps at the wheels dyno result correlates very well with a relatively stock 1G B16A indeed.



Even more significant are the rpm points at which peak power and peak torque were measured. The peak power of 138ps was measured at 7584 or around 7600rpm. Peak torque was measured at 6968 or around 7000rpm. Honda's specified stock figures for the 1st Gen B16A are indeed (at the engine) 160ps at 7600rpm and 15.5kgm at 7000rpm. So, as can be seen, the peak power and torque points were measured at exactly the stock points as specified by Honda.



I think Tamati's dyno result is very significant; the car and engine, is already into its 2nd decade - 10 years of age. That it can still deliver the baseline reference power output including matching the stock spec'ed peak power and torque rpm points speaks very well for the durability and quality of the 1G B16A indeed.





Conclusion

Tamati's Integra XSi have demonstrated that a relatively stock 1G B16A if properly looked after and well kept will last extremely well, indeed even able to deliver power levels as good as if it is a brand new engine. As can be seen from the photos provided by Tamati, the interior of the car and the car itself looks very new.



This is very significant news for Integra XSi & RSi owners. As explained, 1G DA6/DA8 Integra XSi/RSi are well into their 2nd decade of use by now. But Tamati's example tells us that irregardless of age, a well looked after Integra XSi/RSi, properly maintained and exemplarily kept will run just as well as when it was brand new !