HB Cosmo Build-Up
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| I decided that the best thing to do was
ditch the current Radiator in favour of a totally new design which would maximise the
surface area of the front of the car. The two Turbo's were removed in favour of one larger
custom unit based on a Garett T04 configuration. This was manufactured for the 20B in the
USA. A custom made extractor manifold was made to hold the turbo on the side of the engine.
The inlet manifold was modified to incorporate 6 additional injectors to meet any extra fuel requirements that was caused by fitting a higher flowing Turbo.
An HKS AIC (Additional Injector Controller) computer was sourced from the USA and fitted to the vehicle.
To save the Turbo from any unnecessary damage an HKS Blow off valve was fitted.
The Earls Oil Cooler was ditched in favour of two new Setrab Oil Coolers. These were mounted on the front of the car on the left and the right to leave air flow for the new intercooler and radiator. A new front bumper is still to be manufactured to incorporate the new coolers and to provide ducting for the intercooler and radiator.
With this work completed the overheating problems were finally solved and the engine performed much better, so good in fact that the factory Mazda rear end couldn't handle it. In the wet on the motorway I was able to spin the wheels in fifth gear. After the Mazda day at MereMere drag strip I decided it was time to do something about the rear end. Because of wheel spin problems the best time I could get was a 13.3 at 108mph. With no wheel spin this mph figure equates to high 11's low 12's. I dropped the car into Lee and John at Diffs R Us where they removed my old Mazda Diff and replaced it with an HSV Senator LSD with 3.08 ratios. Another driveshaft was manufactured and the half shafts modified to fit the new diff. My traction problems are just about solved, especially with the ratios now being so tall. I am now able to cruise in top gear at 160km/h and be pulling only 3000 rpm. 100km/h will see less than 2000rpm on the tacho. Now that the car is running properly I thought it was time to do something with the interior. I spoke to the guys at Autosport and they are custom manufacturing 2 front seats as well as modifying the rear seats. They are due in two weeks.(13-Sep-96) The Car has yet to be put on the Dyno. We are waiting for a fuzzy logic boost controller to come from Japan which will enable us to increase the boost pressure to around 20lbs. At present the External Wastegate prevents us from exceeding 6lbs. Mind you even at 6lbs the engine feels as though it is far exceeding the 20B's factory 300hp rating.
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