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Hi Comp Performance Engines and Tuning

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Minchinbury, NSW
Hi Comp Performance Engines and Tuning

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LS upgrades, CAM packages n ECU installs,fuel systems, dyno n carby tuning, NOS fits, exhaust fabric

dyno tuning, performance builds, carburettor tuning, mechanical repairs and servicing

31/10/2026

This week at Hi Comp.

This Ford XC Falcon in for a dyno tune.

I wish it was that simple.
This thing threw us all kinds of curve balls.

Baseline runs revealed that the 418 stroker engine would not rev over 4000 rpm. It still made just on 400 RWHP, but rolled over and played dead over 4000 rpm.

The investigation began with the valve train. Turns out that someone put hydraulic lifters on a solid camshaft. ???

Now, you can run solid roller lifters on a hydraulic roller cam , but you can’t run hydraulic roller lifters on a solid roller cam.
The solid profile, needs a solid lifter.

So the lifters were swapped out for solids, and the valve springs were changed to suit the solid roller, with 220 psi seat pressure.

After a full Carby tune, and dizzy regraph, the engine Reved past 6000 rpm, with peak power of 433 RWHP at just under 6000 rpm. A successful result……. Until……

It blew a head gasket on the last power run. 🤦🏻

Head gaskets were changed in a few days, with good quality composite ones, instead of the Chinese knock off ones that were removed.

What you see here, is the dyno run after the head gaskets were replaced. Same HP as before.

Thank you Michael for your patience and understanding throughout what was a very taxing job. You are a true gentleman who kept your composure in the face of what must have seemed like constant bad news.
I’m sure glad that we persevered with this job, and got there in the end.
Enjoy your extra power.

29/10/2026

This week at Hi Comp.

My happy place.

Bench work on some High end Carburettor systems, after hours, with the phone not ringing, door locked, and not a person in sight.

22/10/2026

This week at Hi Comp.

Actually, this job was from a few weeks ago.
It’s Ian’s VF Commodore powerhouse, back in the workshop for some more work on getting that 800 RWHP to the track surface.

A Harrop trutrack diff was installed, along with some rear adjustable Drag Racing shocks and springs.

Dialled in with a bit of back road testing, this combination should do the trick.

Thank you Ian for always trusting Hi Comp with your cars, and for your patronage.
We will see you out at the racetrack

17/10/2026

This week at Hi Comp.

This unique Vintage Gasser in for a dyno tune.

With its 454 stroker BBC engine, and twin APD carbs, this car was always going to be a lot of fun to tune.
What happened instead was the car threw us a whole bunch of curve balls that we had to dodge for an entire week!!

We had to sort out a complex problem of a massive dead spot on launch.

See, this thing lifts the wheels on launch, big time. Now, I know what everyone’s thinking, fuel surge in the float bowl, jets become uncovered, power goes away. Well, maybe, but we were having flat spot issues with the car in a static position right there on the dyno…..

We changed the down leg boosters in the carbs for annular discharge boosters, which I always prefer. Then did further testing with some sheer plates that we made up in the workshop, testing different lengths until we found something that was satisfactory.

I should mention that the dead spot was only below 4500 rpm, above this, the engine was strong and smooth.

Now we can’t test the g forces of big wheelies in the workshop, or the car park, so the ultimate test won’t be until the car hits the racetrack. We can only try to replicate the problem on the dyno, and make changes to what we see isn’t working, and make it work under those conditions. What we came up with was a marked improvement over the condition that the engine was displaying on delivery.

We thank you Simon for trusting Hi Comp to sort you car. We also thank you for your patience and understanding with a difficult problem.
We wish you every success at your upcoming race event, and we hope the car lifts those front wheels to the sky and pulls strong to the finish line.
Good luck to you sir.

08/10/2026

This week at Hi Comp.

Facebook dump.

This is what we’ve been up to for the past few weeks..

02/10/2026

This week at Hi Comp

Happy FryDay

Here’s a short video of Jacob’s licensing passes in the Camaro at the test and tune 2 weeks ago.

Enjoy.

30/09/2026

This week at Hi Comp.

This gorgeous Mustang Fastback in for a dyno tune.

We decided to replace the old vacuum secondary carby with a new Holley double pumper, with all the modern features like four corner idle, and latest emulsion stack configurations. This makes for a much better result when tuning the carb.
As always we tune the ignition as well, with a fully regraphed distributor to match the engine’s needs.

This engine ended up making great power for a 302 capacity cruiser.

Thank you John for choosing Hi Comp for your tuning needs.
Hope to see you out and about this spring.
Enjoy your extra power.

25/09/2026

This week at Hi Comp.

This semi famous LJ Torana back in the workshop for another dyno tune.

This is the Torana from the “World’s fairest Carby to EFI swap” YouTube video.
It’s just had another round of modifications to take it to yet another level.

How about a Nexus ECU, crank trigger, six ignition coils, two knock sensors with closed loop knock control and re**rd per cylinder, idle control and more. This is about the highest development level for a good ol Holden six.

It made a little more power than in the YouTube video, about 13 more horsepower, for a total of 181 HP.
Please keep in mind that this is a temporary engine, with a largely un modified 9 port head, and mild camshaft.
The new engine is currently being built, and will feature a custom crankshaft, alloy head, and more aggressive cam.

But for now, the engine runs smooth as silk, and starts cold or hot with no throttle input, as expected with all this gear.

Thank you Stephen for bringing your Torana back to Hi Comp after all these years for your tuning needs.
Enjoy your extra power.

Address

Unit 2/12 Eddie Road
Minchinbury, NSW
2770

Opening Hours

Monday	8am - 6pm
Tuesday	8am - 6pm
Wednesday	8am - 6pm
Thursday	8am - 6pm
Friday	8am - 6pm
Saturday	9am - 2pm

Telephone

+61296770505

Website

http://www.hicomp.com.au/

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