• Johns recommendations:
  Basically the mods fall into the following categories: 1) Fit the K&N air filter element = 3kW extra, no tuning required. 2) Fit a 38mm bore exhaust with a single flee-flow box at the rear in the normal place = 20kW 3) Fit the waste-gate over-ride kit. = 30 to 50% extra BUT it must be used with a lot of common sense, very intermittently as the engine temperature can get out of hand if used continuously - not to mention the extra stress on the transmission etc. 4) Fit the water injection kit. This only "kicks-in" when the boost comes on line and helps to cool the turbo and engine as well as giving an extra 20% or so due to super-heated steam factor. All in all the mods can be done by anyone with a good mechanical knowledge of the workings of a turbo, but the kit is rather complex - especially the water injection as it involves fitting certain electronic control circuits to monitor the water level and replenish the "water dump" reservoir during non-boost periods (which lets face it is 90% of the running time). All the components are readily available from the after-market suppliers or electronic supply houses.

• Click here to see the first part on water boosting for turbochargers. It can if properly done yield considerable increase in power, but read the warning notes carefully. 14/9/98

• Click here to see the second part on water boosting for turbochargers. It can if properly done yield considerable increase in power, but read the warning notes carefully. 14/9/98

Last updated : 4 December 1998
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