SJC Tuning and Performance

SJC Tuning and Performance Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from SJC Tuning and Performance, Automotive Customization Shop, Hampton Downs Motorsport Park, Te Kauwhata.

Shop car is starting to take shape. Not long before it’s sitting on some wheels.Meeting with the cert man went well and ...
02/06/2026

Shop car is starting to take shape.
Not long before it’s sitting on some wheels.

Meeting with the cert man went well and everything is progressing smoothly.

Grant at Paralax is absolutely killing it on the chassis job. His skill set is unreal couldn’t be more impressed.

So excited to be able to cruise the streets in this one day.

Another car out the door,We fitted the motor 1uz with custom sump, built a full stainless exhaust, custom wiring with li...
28/05/2026

Another car out the door,
We fitted the motor 1uz with custom sump, built a full stainless exhaust, custom wiring with link ecu. Engine running 12v with truck still running 24v.
Will sound good when it’s slinging some mud.

Good to have old faithful of on the dyno for a health check. One of my 1st jobs when opening shop was wiring, tuning an...
24/05/2026

Good to have old faithful of on the dyno for a health check.
One of my 1st jobs when opening shop was wiring, tuning and helping plumb this car.
3 year later, over 400 tyres later making 600hp all its needed is oil and filters.
Many upgrades to the car along the way but the engine package still stays the same.
Good car this one.

Had the pleasure of going down to in CHCH to finalise the trans tuning on this epic built GTR with ZF8HP. Loaded in som...
15/05/2026

Had the pleasure of going down to in CHCH to finalise the trans tuning on this epic built GTR with ZF8HP. Loaded in some of my new shift strategies and off we went. Making them shift fast is one thing, but making them drive in auto silky smooth is a whole different level. It takes hours to get it amazing. Throttle blips, subtle shift cuts in the different modes. This has 3 auto modes and 3 manual modes from smooth to sport to race shifting. Iv worked hard on strategies between TCU and ECU to keep making this setup better.

Final result, a car that drives like a late model bmw,
Yet in sports mode drives like a high end performance car, then manual modes where its like driving a race car.

The level on this build is unreal everywhere you look is attention to detail. has knocked this one out of the park.

09/05/2026

Some live footage of the ZF8HP we tuned going around a race track.
We tuned this engine and trans combo with maxx ecu.
Same tyres from last year and setting some pb times goes to show these boxes have their place.
When the combo is done correctly they are amazing.

XB coupe was back for a few more jobs.Last effort was the big one getting cert and fixing so many things along the way, ...
04/05/2026

XB coupe was back for a few more jobs.

Last effort was the big one getting cert and fixing so many things along the way, the only thing that never came out was the motor.
Due to having some oil leaks we removed the engine fixed the engine leaks a reinstalled.
Not the easiest task with a paint job like this.
We also added a bit more stainless shine to the engine bay while we were there.
From a car that originally arrived for a carby tune turned into close to a few hundred hours work repairing work to a cert standard and fixing many gremlins along the way.
Such a cool looking and sounding car.

Grants awesome truck we had the privilege of doing a full efi conversion on. We got to complete a full wire up on the 49...
02/05/2026

Grants awesome truck we had the privilege of doing a full efi conversion on.

We got to complete a full wire up on the 490CI big block, using all tefzel wire,
Quick release firewall plug,
IGN1-A coils
Dual lambda
Dual knock
All the necessary sensors plus xtras for safety.
One of our relay boxes.
Link ecu.
Followed by a tune.
Sounds angry, drives smooth job complete.

09/04/2026

.garage dropped his 13b turbo ute off for a tune.

Sorted the boost issues causing it to cut.
Carried out a tune and turned the boost up.
Made a healthy 463hp on 16psi of boost. Enough to be an absolute handful in a ute.

09/04/2026

Davos car in for Trans tune, Turbolamik/maxx ecu combo.

Dialled in to be used for drifting.
Insane build set to such high quality.
Excited to see this smoking some tyres at the track.

Its not quite thats for sure.

26/03/2026

Another 8hp instal done,
Maxx ECU running engine and trans.
Haltech ic7 dash.

Shifts are fast and smooth.
Modes change depending on driver conditions.
So nothing to think about the more you put your foot down the faster the shifts get. Want to cruise around in smooth auto then shift into manual for more aggressive shifting.
All shiftcuts are based on drive mode.
Night and day compared to a BTR trans.

Address

Hampton Downs Motorsport Park
Te Kauwhata
3782

Website

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