9 replies to this topic

[Stuey]

I know a few people have had this modification done and my old Stage 2 car had one fitted when I bought it. I'm back in a standard non-staged turbo now and I'm not entirely sure what the exact benefits of the newer Z20LEH turbo are? I'm not exactly mechanically/engineering savvy, so could somebody fill me in as to whether this is a worthwhile mod and the associated benefits/costs. Is it only worthwhile only if you move to Stage 1 or 2, which I'll be doing in July? Cheers, Stu

[Thorney]

Stronger turbo, higher spec actuator, can handle higher boost and more prolonged boost. Cost is about £500 plus fitting plus remapping (although its better even without a remap).

[Guy182]

Stronger turbo, higher spec actuator, can handle higher boost and more prolonged boost. Cost is about £500 plus fitting plus remapping (although its better even without a remap).

so tempting..

on a car with just a milltek, (no chargecooler) would it be able to handle more boost though (and thus more power)? or are the benefits mainly the way it can hold boost to higher revs?

Edited by Guy182, 22 December 2006 - 01:16 PM.

[jasvxt]

So this can be done without a charge cooler installed ? What about temperatures ? Also thought having the Astra Vxr turbo also means having the matching injectors as well for better fueling ? Is the oem fuel rail still used when using the upgraded injectors or is the Vxr fuel rail required as well ? Thanks Jas

[Joe-Turbo]

dont even need a full milltek to have it fitted but as air flow with the standard exhuast is so restrictive you wont really be getting the full benifit. I went out it a vxt with a full milltek with vxr astra turbo and ap 4 pots, bit of a monster.

Edited by Joe-Turbo, 22 December 2006 - 01:41 PM.

[MAP18W]

Also thought having the Astra Vxr turbo also means having the matching injectors as well for better fueling ?

Is the oem fuel rail still used when using the upgraded injectors or is the Vxr fuel rail required as well ?


Thanks


Jas

The injectors are used on a Courtenay Sport Stage 4 conversion as additional fuel is required, hence higher flow injectors. This is because the standard injectors are maxed out at about 275 bhp.

The LEH turbo can be used on any Stage of tune, its an ideal and cheaper option if you have a turbo unit that's failed.

On a standard car or Stage 1, 2 or 3 the vxr (z20leh) turbo can be used with standard injectors as they fuel fine. Only above about 275 bhp do the standard injectors run out of duty cycle, hence we fit the higher flow injectors on a Stage 4 with a recalibrated map to suit the higher flow rate of the injectors so the car doesn't over fuel, which it would if the injectors are fitted without re-calibrating the flow rate of the injectors within the map.

The fuel rails are the same so you can use an original rail or the VXR rail (they both fit), the only difference is we use the 3.3 bar fuel pressure regulator that the ZLET uses rather than the 3.0 bar one that the VXR (ZLEH) uses.

Edited by MAP18W, 22 December 2006 - 02:43 PM.

[Stuey]

So this can be done without a charge cooler installed ? What about temperatures ?

Yeah I was wondering about the temp as there was an intercooler waterspray on my old car. Although I didn't use it unless I was in traffic and even then I only had the temp go above 100 on a couple of occaisons. Anyway, sounds like my bank account is going to take a bit of a bashing in the new year . All for a good cause though hey?

[oblomov]

Stronger turbo, higher spec actuator, can handle higher boost and more prolonged boost. Cost is about £500 plus fitting plus remapping (although its better even without a remap).

John, is it just plug and play, that is, is it just a mechanical fitting and it's ready to go?

[Guy182]

yeah its a straight swap for the unit, 500 quid gets you the complete astra vxr unit with stronger manifold, so straight swap. then a good remap.

[jasvxt]

Also thought having the Astra Vxr turbo also means having the matching injectors as well for better fueling ?

Is the oem fuel rail still used when using the upgraded injectors or is the Vxr fuel rail required as well ?


Thanks


Jas

The injectors are used on a Courtenay Sport Stage 4 conversion as additional fuel is required, hence higher flow injectors. This is because the standard injectors are maxed out at about 275 bhp.

The LEH turbo can be used on any Stage of tune, its an ideal and cheaper option if you have a turbo unit that's failed.

On a standard car or Stage 1, 2 or 3 the vxr (z20leh) turbo can be used with standard injectors as they fuel fine. Only above about 275 bhp do the standard injectors run out of duty cycle, hence we fit the higher flow injectors on a Stage 4 with a recalibrated map to suit the higher flow rate of the injectors so the car doesn't over fuel, which it would if the injectors are fitted without re-calibrating the flow rate of the injectors within the map.

The fuel rails are the same so you can use an original rail or the VXR rail (they both fit), the only difference is we use the 3.3 bar fuel pressure regulator that the ZLET uses rather than the 3.0 bar one that the VXR (ZLEH) uses.