Author Topic: 1982 GTV renovation  (Read 36694 times)

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Anth73

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Re: 1982 GTV renovation
« Reply #165 on: November 10, 2022, 09:58:45 PM »
A few more engine bay photos. Dyno tuning throughout next week at Melbourne Performance Centre to finalise the Motec setup in a variety of cold and hot start / running conditions. Aiming for at least 180hp at the wheels and a nice strong torque curve.
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!

Anth73

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Re: 1982 GTV renovation
« Reply #166 on: November 11, 2022, 05:13:57 PM »
Short video in the comments of the car being driven for the first time since Jan '21. Very happy with the sound!

https://m.facebook.com/groups/867666823289359/permalink/5869603373095654/?sfnsn=mo&mibextid=BUZLm6
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!

Anth73

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Re: 1982 GTV renovation
« Reply #167 on: November 15, 2022, 09:37:55 PM »
Dyno tuning has started!
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!

GeeTV

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Re: 1982 GTV renovation
« Reply #168 on: November 18, 2022, 09:03:44 AM »
Engine bay looks awesome!
Will we get to see [& hear] her in the flesh at Spettacolo next weekend?

Anth73

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Re: 1982 GTV renovation
« Reply #169 on: November 18, 2022, 06:16:53 PM »
Well the dyno numbers are in and I'm very happy with the results for a build that targeted a fast road setup with usable power/torque. Dyno number are 125kW / 230Nm at the wheels (not sure why 190Nm is quoted as the max torque), so perhaps 150kW or a little more if you believe the 18% driveline losses typically quoted for a GTV6. Every dyno is different so who knows what it may actually be. About on par for a warm 3L 12V given the SZ was quoted at 154kW.

The power and torque curves are really nice though, good torquey midrange with sustained top end power to 7400rpm.

Back to Rankins Panels for final fitting of the new bonnet and hatch, a couple of minor things to tidy up with Monza Motors and then off to Spetaccolo on Sunday to mark the end of a 22 month journey.
« Last Edit: November 18, 2022, 06:29:37 PM by Anth73 »
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!

shiny_car

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Re: 1982 GTV renovation
« Reply #170 on: November 19, 2022, 08:58:44 PM »
Nice one.  Solid numbers.  Would have been nice to achieve your aim of 180hp atw, but for a street car, the numbers are a bit academic when you're not driving on the rev limit very much.

Pity I can't make Spettacolo!  :-\
Giulietta QV TCT . 1.75 TBi . Magnesio Grey - Black
GT . 3.2 V6 . Q2 . Kyalami Black - Red
75 . 3.0 V6 . Alfa Red - Grey

Anth73

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Re: 1982 GTV renovation
« Reply #171 on: November 20, 2022, 07:47:54 AM »
Some interesting feedback regarding the flat power numbers from 6400rpm, suggesting a lack of airflow. I opted not to enlarge the plenum throats and intake runners despite these being pointed out in Jim K's book as being inadequate for a tuned 3L. Looks like I've got a date with some flapper wheels in the future.
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!

GTVeloce

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Re: 1982 GTV renovation
« Reply #172 on: November 21, 2022, 05:08:30 PM »
Great to see it up and running! Well done on a big achievement.

Like you, I suspect there might be a little more to be had at the higher end if you can get it to flow better.

I'm also surprised to see peak torque at so high an RPM but I'm no expert. The SZ had peak power at 6200 and peak torque at 4500 but that was running Motronic with AFM. Did RJ give you an idea of curve characteristics of his camshafts? And if so, does what you have match?

Anth73

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Re: 1982 GTV renovation
« Reply #173 on: November 21, 2022, 05:41:19 PM »
I went with C&B "road max" cams. Though the torque peak is higher in the rpm range, 90% is available from 3000rpm. Hopefully that translates to a good midrange. The engine is still quite new also, expect it to loosen up over the first 1000km.
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!

Anth73

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  • Posts: 315
Re: 1982 GTV renovation
« Reply #174 on: November 25, 2022, 08:49:55 PM »
Christmas came a month early with the present being a 3lt busso to drive home. I'm still smiling from the experience! See you at Spettacolo on Sunday.
Now:
2012 Giulietta QV Manual
1982 GTV6 build in progress

Then:
2002 156 2.5V6 Manual
2012 159 2.4JTDm Sportwagon
1974 105 2000 GTV with a 1750 rear half...that was a shame!