GT 45
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Probably not, I dont care though. Charles' GT47 setup isn't ball bearing either. I think with the spool up of twins as long as you can get the little turbo rolling, the primary being non ball bearng wouldn't be an issue in terms of spool up.
But then again, I dont know a great deal about twins.
But then again, I dont know a great deal about twins.
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11,602 Posts
I wish I knew about twins...
I can tell those twins cost way too much.
I plan to, just want to know how well the 45 would work on top of a stock or bb turbo
I have read most of the book maximum boost by corky bell. It talks about twins and how to do the math on them. I don't know how to do it off the top of my head, and I don't have the book right now.
Figured Charles, or someone else could help crunch some numbers and give a good guess as to how these will work together, and how much boost, cfm, lb's/min, etc.
Garrett only lists one option for the 45 on their site, http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT45/GT4508R.htm
The rest have a bunch of different configurations, and maps. :shrug:
The rest have a bunch of different configurations, and maps. :shrug:
There are several turbine housing options, so there is more than one option for the GT45 family. Doesn't look like there are any options for the compressor though. I think you would be better suited with a turbo that has more options, unless you do all the math and nail it the first time so you don't have to tweak it any.
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7,730 Posts
It all depends.....
If you planned to run a good bit of boost, a 45 would be a good choice.
Amazingly, if you wanted to run 50lbs or less, the 45 would be too small....
The lower the boost you want to run, the bigger the charger has to be to still be efficient....
You can't make a blanket statement about compounds and any given charger without also stating the rpm and the boost you plan to run. And in reality, you need to factor in intercooled/non-intercooled, where is it intercooled? First stage, interstage, both stages, only after the second stage......
Because the charger's size depends on the intercooling, and where.
Answer this:
Manifold boost __ psig
Engine rpm for peak power ____ rpm
Intercooling plans ___________
Only then can you determine the relative "fit" of a first stage compressor.
But just shootin from the hip here......if you were running the same basic setup as I am, and you had one HELLUVA good sized wastegate for the second stage, then I'd say the 45 would work well. If you wanted to balance both stages and expect the 45 to still be efficient, you'd likely need to run upward of 70psig boost pressure.
If you planned to run a good bit of boost, a 45 would be a good choice.
Amazingly, if you wanted to run 50lbs or less, the 45 would be too small....
The lower the boost you want to run, the bigger the charger has to be to still be efficient....
You can't make a blanket statement about compounds and any given charger without also stating the rpm and the boost you plan to run. And in reality, you need to factor in intercooled/non-intercooled, where is it intercooled? First stage, interstage, both stages, only after the second stage......
Because the charger's size depends on the intercooling, and where.
Answer this:
Manifold boost __ psig
Engine rpm for peak power ____ rpm
Intercooling plans ___________
Only then can you determine the relative "fit" of a first stage compressor.
But just shootin from the hip here......if you were running the same basic setup as I am, and you had one HELLUVA good sized wastegate for the second stage, then I'd say the 45 would work well. If you wanted to balance both stages and expect the 45 to still be efficient, you'd likely need to run upward of 70psig boost pressure.
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