glenanderson
Club Retro Rides Member
Posts: 4,107
Club RR Member Number: 64
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A cursory look on Evil-bay suggests that you can pick up a Chineseum GT30-a-like for as little as £130. Maybe, as it’s a straight swap, it’s worth trying one, and if the difference is immediately noticeable then plan for a re-engineer of the system for a GT28 over next winter?
On the bright side, would the smaller turbo not also free up space in the engine bay?
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My worst worry about dying is my wife selling my stuff for what I told her it cost...
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Enbloc
Part of things
Posts: 353
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I think you may have hit the nail on the head there. You can either do Turbo sizing the scientific way with compressor maps, or you an go on rules of thumb. Rules of thumb work, but in this case I think basing it on engine size was the wrong way to go. It's probably better to think of the amount of air (exhaust gas) an engine can supply to the turbo to spin it would be based on the power output it made to begin with. What did the flathead make as standard? Start with that, then aim to perhaps double it and select a turbo based on that target. My thinking as well. Factory outputs differed over the years from 60hp to 110hp which in real world terms probably meant 60-80hp! A good tuned NA one is 160-180bhp, supercharged 200-250bhp. A max output of around 250bhp is what I've been basing my current calculations on. A cursory look on Evil-bay suggests that you can pick up a Chineseum GT30-a-like for as little as £130. Maybe, as it’s a straight swap, it’s worth trying one, and if the difference is immediately noticeable then plan for a re-engineer of the system for a GT28 over next winter? On the bright side, would the smaller turbo not also free up space in the engine bay? Yep the Chinese turbos are that cheap, the reason I went that route as I didn't want to be swapping £1000 turbos each time. Absolutely, I would have saved a ton of packaging issues with the smaller turbo.
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i think glen anderson has hit the nail on the head cheapy gt30 if it improves enough you are happy winner winner
if you think there is more drive it this season with the gt30 and have a plan of attack for the gt28 next winter
you know it makes sense 🤣
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ds67
Part of things
Posts: 12
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The GT30 route may be a good compromise. Easy swap, still enjoy the car this summer, and it will give you a good indication on what your car needs.
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Enbloc
Part of things
Posts: 353
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I've frazzled my brain now on all this trying to cross reference all the sizes and dimensions.
Even though the GT30 has the same flanges as my currently fitted GT35 I don't think its dimensionally the same and has some detail differences from what I can tell just by looking at the pictures. This means that its unlikely to be a true "bolt on" but the Chinese GT28 which isn't a bolt on at all seems to be a closer match to the higher output Garrett GT28 which actually puts the map closer to a GT30.
I think I'm going to lay down in a darkened room for a while...
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