Astra H VXR

Astra H VXR

The Astra H VXR engine (Z20LEH) is a development of the Astra G’s Z20LET power unit. Rather than simply diving straight in with remaps, we stripped an engine down to component form to examine its internals and get a real feel for what has been done. One of the main differences is the block has been equipped with oil spray jets. These jets cool the pistons by spraying oil at the underside of the piston. These oil spray jets were added for manufacturer's durability reasons because the LEH engine produces 240PS as standard (where the LET engine only produced 200PS), and not because, contrary to internet myth, the factory Z20LEH engine runs lean. In fact the Z20LEL and Z20LER engines used in Astra H run at the same target lambda value from the factory as the Z20LEH engine, and the LEL/LER engines do not have under piston cooling.

The pistons themselves are high yield forged items with the skirts Teflon coated to reduce noise and wear. Gone are the Z20LET’s counter rotating balancer shafts. This sharpens response whilst helping the engine rev much more quickly. At the top end the inlet manifold is revised however this revision is across the whole of the MK5 engine range, the VXR though getting new larger injectors. The turbo charger is a hybrid item, equipped with a better A/R ratio and stronger bearings. The manifold it has been built into is cast in a higher yield of material making it less prone to cracking. This turbo unit has been available for a while now from Vauxhall and we have already used many times on the Astra G and the VX220 with good results.

Once we had established the above we then under took mapping our first VXR. The results are very good, however we could not take the car any further than this on the standard intercooler. So extensive cooling modifications were investigated and developed for the next level of power, to ensure the longevity of the engine and surrounding components.

 

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Please Note: Plugs are listed individually.The Best Plugs to use for 1.6 Turbo (Z16LEx/A16LEx/B16LER..
£8.25
Ex Tax: £6.88
Self Adhesive Courtenay Sport Splat! Gel Dome Resin Raised Bubble Badge. In Black with the..
£1.80
Ex Tax: £1.50
Damper/Shock Absorber Securing Top Ring/Clip for Astra H and Zafira B - ALL Models. Secures the top ..
£1.50
Ex Tax: £1.25
Flywheel Retaining bolts M9x23 for Z16LEx A16LEx B16LEx Engines.Six Required Per Car..
£1.55
Ex Tax: £1.29
Description FOR USE WITH PLATE TYPE LSDs e.g. DREXLERCompetition fully synthetic transmission oil. ..
£19.96
Ex Tax: £16.63
Black Plastic Oil Filler Cap. Replaces existing yellow cap where fitted. OE to some later Vauxhall m..
£3.15
Ex Tax: £2.63
REAR EBC Disc and Pad Kit - Corsa D 264mm 5 StudAn OEM EBC disc and pad kit for the rear comprising ..
£86.40
Ex Tax: £72.00
FULL VEHICLE KIT FRONT and REAR EBC Disc and Pad Kit - Corsa D 1.6 TurboFront: 308mm Vented Rear: 26..
£210.00
Ex Tax: £175.00
FRONT EBC Disc and Pad Kit - Corsa D 308mm 5 Stud 1.6 Turbo (NOT Nurburgring/Clubsport)An OEM qualit..
£123.60
Ex Tax: £103.00
EBC Plain Front Disc 305mm x 28mm for Corsa D VXR Nürburgring and Clubsport with factory Brembo Cali..
£237.60 £198.00
Ex Tax: £165.00
REAR EBC Disc and Yellowstuff Pad Kit - Astra G / Astra H 264mm 5 StudAn OEM EBC disc and pad kit fo..
£118.80
Ex Tax: £99.00
REAR Disc and Redstuff Pad Kit - Astra H 264mm 5 StudA disc and pad kit for the rear comprising of a..
£110.40
Ex Tax: £92.00