VR Ute

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vlad01
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Re: VR Ute

Post by vlad01 »

immortality wrote: Tue May 13, 2025 8:10 am That is a good chart.

I prefer twin exhaust systems where possible.

It's a shame muffler manufacturers don't post flow numbers for ....mufflers.


If they are straight through perf wool packed ones, they should be the same as the exhaust pipe diameter flow like in the chart.

But chambered mufflers, yeah that's different and would obviously be less.

Speaking of mufflers. I found these that go to 3.5" which is ideal for a lot of more substantial builds. I'd love to know what they sound like though.

Even though it's listed VK/VL, it would be the same for any first or second gen commodore. The sizes they list are correct for any of these commodores which I might add are hard to find in that size for mufflers of this in/out diameters. Nearly all of the universal mufflers don't fit in those larger pipe diameters I found.

https://spmufflers.com.au/collections/h ... 7279145124
brindo
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Re: VR Ute

Post by brindo »

I did consider the rear wheel tubs. There is a decent kit which I think is either 2.0 mm steel or better. Anything would be better than the factory tub which is only 1.0 mm which get easy dented in the back of a ute.
I think the cost was OK, but wouldn't have the confidence to install them myself.
gtrboyy
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Re: VR Ute

Post by gtrboyy »

Easiest way would be to cut section between wheel tub & chassis rail then dolly or belt wheel tub in to chassis rail lip think gain 30 or 40mm cant remember.

Mine is split tubbed,vl wagon diff 15x7 53p chaser 255/60/15 also removed ute bumpstop brackets so can sit even lower when put sedan/wagon bumpstop in rail...slot is underneath ute bumpstop bracket.

Will try find pics.
gtrboyy
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Re: VR Ute

Post by gtrboyy »

20250417_161834.jpg
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brindo
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Re: VR Ute

Post by brindo »

Yes I did see that. Quite impressive with the 255s.
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vlad01
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Re: VR Ute

Post by vlad01 »

This one is factory stock and the stock 205.

Normal height.
IMG_8371.jpg

Fully travel, pretty close to the inner arch, but the outer is ample.
IMG_6141.jpg
IMG_6147.jpg
The current shitbox with 215s with the same offset as the HSV wheels common at the time, +37

about 7mm outer and can rub on the inner on hard corners when the axle angles get steep.

225 rubbed both inside and out.
IMG_8369.jpg
IMG_8370.jpg

The VP S with walkies. 215 and the same +37 offset.

But this tyre was half down so the axle was on a slight angle, that was enough to have an apparent zero clearance, but in reality, it would possibly rub when this angle is maintained under compression. ie.. cornering into a dip or cornering under a heavy rear load. Since the shitbox rarely does it now with 215 but has occasional evidence of tiny amounts of rub (silent), 205 should make it impossible, but it still looks tight either way.
IMG_8368.jpg
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brindo
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Re: VR Ute

Post by brindo »

So this was something I never had on my bingo card 17 years ago, but yesterday I was a spectator watching my daughter race this ute at the local 1/8 mile drag strip.
From the outside looking in, we had a shocker. She got 4 qualifying runs and 3 rounds of racing. So 7 runs all up - and stalled it on the start line 4 times.
But we had an amazing day.
She has only just got her license last month, never raced before, and aside from the bikes, it was the only manual there. The only prep I did other than checking the oil and coolant was to fit the rear mudflaps, and put the remaining two 17” HSV wheels on the back thinking there was some better traction to be had. Other than that, she drove it as is to the track. Full exhaust with the rear resonator, just under a full tank of fuel, spare tyre, ute mat and jack all still in place. I do have a set of MT slicks on pursuit rims in the shed, but they are over 20 years old now so not an option. That and I’m not ready to put a clutch in it just yet. I’m also not keen on an inexperienced driver and a canvas/radial combo as they float around a lot.
Ironbark 1.png
But the standout for me was the amount of competitors and volunteers who came up offering encouragement and advice to her. Everyone was so friendly and accommodating. They gave her a decent tour of the start line and fully explained how the lights and everything works. We also had 2 solo runs where I was a passenger. Everyone was so good to her, and it made for a brilliant day. Her ute went well, there was no axle tramp, and she had the same traction issues as everyone else not running slicks.

First run ever (with me as a passenger) pulled a decent 9.449 at 77 mph. 0.357 reaction time which is brilliant for a first attempt and way better than I have ever got.
For the racing we ended up dialling in at 9.00 seconds neat. Best time for the day was 9.181 at 80.17 mph. So it’s not fast by any means, but went surprisingly well, and there are slower cars that get trailered to the track. But clearly there’s more in it.
I recon with a lot more practice on the clutch and a set of drag radials there’s a mid to high 8 in it. And let’s not pretend the tune is perfect either. The cut off for street is 8.50 seconds so that’s a good place to stop.
One of the highlights of the day was a stall on the start line. She restarted and tried to get going again, lost traction and smoked the tyres (or tyre) the entire track for a 13.5 second pass. I can’t post the video but these are the screen shots of that run.
Looks like I’ll be getting a price on some drag radials. And maybe a Torque Lock centre.
Ironbark 2.png
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VTXU8
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Re: VR Ute

Post by VTXU8 »

Sounds like she had a great day and not discouraged from doing it again. Good to see the community joining in to offer advice and support.
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vlad01
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Re: VR Ute

Post by vlad01 »

Awesome to hear she gave it a good crack! :thumbup:
seabreeze
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Re: VR Ute

Post by seabreeze »

Great stuff! Single pegger down the entire strip is the stuff of p-plater dreams.
:driving: