Holden diagnostics

Holden diagnostics

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Mail order or dyno tuning and performance parts
ECU replacement and security relinking
Custom conv Specializing in Holdens from VR to VF.

Bench test simulation, ecu replacements and programming, diy scantools and upgrades, Ecu tuning and custom conversion programming.

29/09/2026

🔥 WIN A FAMILY PASS TO SUMMER OF CARNAGE! 🔥

We’re giving away a FAMILY PASS to Summer of Carnage at Whanganui Speedway this weekend! 🏁🔥

TO ENTER:
👉 LIKE this post
👉 COMMENT below and tag who you’d bring along!

Sharing isn’t required, but we’d love you to SHARE it around and get the word out! 🤘

🏆 Winner drawn at 8PM Thursday!

We’ll be there this weekend helping put on a show, so come down, say hi and enjoy some carnage! 🔥💨

Family pass is either
2 adults + 2 children
Or
1 adult + 3 children

⚠️ We’ll announce the winner from this page.

24/09/2026
22/09/2026

The boys are getting ready for AutoFest!
0tyres Burnout Car
Peter Clarkson

19/09/2026

Autofest prep 26!!

07/09/2026

🔥 ARE YOUR MUFFLERS COSTING YOU POWER? 🔥

Flowmaster 40 Series mufflers sound good… but are they really worth a 40rwkw loss?! 😳

Even we were surprised by just how much of a restriction these mufflers proved to be on the dyno.

Back to back run, same timing, same AFR
The difference? Nearly 40rwkW just from removing the restriction.

They might give you that classic Flowmaster sound, but when you’re chasing power, flow matters!

Sometimes the restriction isn’t where you expect it. 👀

03/09/2026

Devyns VY SS. Came in with a OTR and maf in already installed with no tune, once we removed maf and tuned to suit, we picked up another 20rwkw peak and around 20-30Nm torque from 4000rpm up where the maf is quite restrictive.
Also added the ghost cam idle as requested.

06/08/2026

Is it strip time for the Jet?

GIVEAWAY IS NOW CLOSED
Thank you to all who entered and a massive thank you again to Zestino New Zealand
Congratulations to our winner Robert Blake !! Zestino will be in touch with you

!! Drag Radial Giveaway in Collaboration with
Zestino New Zealand !!

Just like previous years, Zestino has yet again kindly teamed up with us to giveaway a pair of 275/60/15 Zestino ST400 DOT Approved radials (valued at over $850) in time for this year’s Petrolhead Father’s Day Drags!

The Zestino ST400 DOT Approved Drag Radial is a high-performance tyre designed to provide the ultimate traction in drag racing conditions. Featuring a low void, directional tread pattern, these tyres ensure maximum contact with the track surface, providing top-notch straight-line traction and acceleration!

For your chance to win, here’s what you need to do:
- like this post!
- comment tagging at least 2 friends
- comment a photo of your car you would use these drag radials on!
- follow this page and Zestino New Zealand
- share this post and send us a screenshot as proof!

Entries close Wednesday, August 12th 2026 at 6pm. The winner will be contacted by us shortly after the giveaway ends. There will be only one winner but giveaway is posted on both Instagram and Facebook

Conditions:
- you must complete all four steps to be in the draw
- you cannot tag celebrities, it must be people you know

Please note: this is our only page, do not be fooled by potential scammers and do not click on any links you may be sent regarding this giveaway. The winner will be contacted by this page only and we will not ask for any bank details or send any links for you to click on

For more information on tyres that could suit your performance, race, rally or drift car, contact the team at www.zestino.co.nz to find out more!

10/06/2026

Longer video with some explaining.
VY HSV with VCM714 camshaft OTR, and stock exhaust.

Photos from Holden diagnostics's post 21/05/2026

Massive congrats to Damian, taking out Pro class in the Spuds trailer hire burnout comp last weekend! What a weapon! Always driving at the top of the game and flying that HDL flag proud. Well done brother. Another one for the shelf! Peter Clarkson Bonnie Galloway Eddie Hart

🤘☺️🤘

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