Holden diagnostics

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.

21/08/2026

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.

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

🤘☺️🤘

10/05/2026

This gorgeous old EH was brought to us to iron out a few issues after being fitted with a Haltech Rebel LS ECU, alongside a Haltech PDM, 2x4 CAN Keypad and UC10 dash setup.

We went through and corrected a number of initial setup and calibration issues left behind from the original install, then got stuck into the tuning side of things. The end result was a massive improvement in drivability, with over 100Nm gained through a large portion of the RPM range, while completely eliminating the violent off-idle surge issue it arrived with.

We also configured the CAN keypad and drive-by-wire system to incorporate fully functional native-style cruise control, exactly how the customer wanted it.

Absolute credit to the owner and builders of this car — the quality of the build is easily a 10/10 on this girl 👌

28/04/2026

punishthepad!!! 🤘

Unfortunately we couldn’t make it to this one in person — but HDL was out there in force with 21 of our customers competing… that’s 21 out of 65 entered cars! Massive turnout, and they absolutely delivered.

🔥 6 cars in the Top 10
🔥 HDL customers locked out the entire podium — 1st, 2nd, 3rd!

Couldn’t be prouder of everyone who showed up, drove hard, and represented us banners or not!

Huge congratulations to all our customers who made the event — and an extra massive shoutout to our podium finishers and trophy winners:

🏆 1st Overall — DARREN ROBERTS / LIMITR (11 years strong!)
🥈 2nd Overall — SHAUN JURY / BARELY
🥉 3rd Overall — DAMIAN HART / NUTTER

Category winners:
🏆 1st Female — SARAH HUMPHREY / ERROR
🏆 2nd Female — TONI WEBBER / MZBARA
🏆 3rd 6-Cyl N/A — DOUG GRIFFITHS / WEOUT
🏆 1st 6-Cyl Boost — SHAUN JURY / BARELY
🏆 1st 8-Cyl N/A — MIAH TARAWHITI / TINASS
🏆 3rd 8-Cyl N/A — BEAUDENE HURNDELL / WEONIT
👑 Tip-In King — TJ DORMAN (Feejoa) / SKRAPA

To everyone flying the HDL flag — thank you. The results speak for themselves.
Absolutely unreal effort from you all. Bring on the next one! 🤘🔥

26/04/2026

A couple of weeks ago, Shaun’s Barra-powered EA was dropped off to us to sort out a few issues. We quickly uncovered some wastegate and boost control problems, then reworked the original tune — all while dealing with an ECU platform we’d never previously tuned (thanks to Gav at HPR for giving us a crash course in how this system works!)

After a few burnout comps, we pulled the logs and dug deeper, uncovering heat-related tables activating on the pad that simply couldn’t be replicated on the dyno.

With just 3 days before Punish The Pad, we remotely jumped back in, reviewed the data, and made the final tune adjustments.

The result? The car was absolutely on point — helping Shaun secure 1st place in the Forced 6 Cylinder class and 2nd Overall!

Massive effort, mate — well deserved.

16/04/2026

Chris brought his manual VY HSV Clubsport in for a OTR and dyno tune. Asked for spark cut and decel flames 🔥 while he was here. 👍👍
Punching a easy 254rwkw peak

09/04/2026

This was a cool jobby!
Tony dropped off the mighty jacked AYEWW, fitted with Fitzroy Motorsports old stock car motor after the OG dropped a valve at the last round of 6 banger nats. Tasked with “just make it skid” a week before Rapanats Burnout Competition, we got to work on the AU ecu fitted with a J3 chip. Something we haven’t had a lot of experience in. Well… what a learning curve! But we got there in the end, making that rapanats deadline, Tony picked it back up on the way to the event but not before instructed to “test to see if it skids..”
After personally being at the event to watch the outcome, we were not disappointed! What a change that new engine setup made! To see him roll off the pad with a the biggest grin on his face made all the frustration of learning a new system worth it!
Can’t wait to see more of it in action!