How To….. Fit a Z22SE Airbox on a Z20LET Astra-Sport Disclaimer - Please note that this is a guide only and Astra-Sport take NO responsibility for any damaged caused to yourself or vehicle whilst using this guide. If you are unsure how to do something leave it to the professionals. Your Insurance and warranty might be invalidated if this modification is done. Why do this mod? •
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More direct route to the turbo, thus decreasing pressure loss in the inlet and theoretically increasing power. The shorter route increases noise from the turbo making the dump valve more audible. (This is possibly why Vauxhall did not choose this arrangement as standard). The extra noise may or may not be desirable. Less heat soak due to removal of the metal crossover pipe. Theoretically increasing power. Easier to change spark plugs as they are no long obstructed. Tidies up the engine bay.
This mod can be done by either using Samco silicone hoses or standard Z20 LET pipes Procedure - Using Samco Hoses Parts required • • • • •
2.2 Airbox Part Number 9129077, this comes complete with everything you need to fit including a new standard air filter. Retail £48.95 + VAT Silicon hose - AFM to Turbo. 70mm reducing to 63mm through 90 degrees. Samco pt no. RE90.70.63. £19.50+vat. Silicon hose - Airbox to AFM. 70mm to 70mm through 45 degrees. Samco pt no. E45.70. £22.50+vat. Pipercross crank case breather filter pt no. C9025. £19.23+vat. 1m 20mm ID crank case breather pipe.
(Samco hoses can be ordered from Merlin Motorsport on 01249 782101). Prices are correct at time of writing. Thanks to MattS & Mike Warner for the “How To”