996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

18g Vs 20g

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Old Oct 15, 2009 | 05:06 PM
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18g Vs 20g

Does anybody know what would be the difference between these turbos in hp?same boost,same car...does it worth it?any diameter info of the impellers?
 
Old Oct 15, 2009 | 05:33 PM
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If u wanna go to 20G's make sure to get Protomotive full system ( Proto intake system, Proto 4.5" coolers, Ford Maf.......etc )

Those 20g's pulls harder than 18g's

20g's with Proto full system u would see 680awhp!
 
Old Oct 15, 2009 | 06:29 PM
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Reading your signature it says you got the K24/18G's I'd just go to the Tial turbo's that is your next step the 20G's is not going to be a big enough gain for what you will spend to upgrade to them
 
Old Oct 15, 2009 | 07:03 PM
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indeed if you go bigger you will need intake supporting mods or the car will litteraly choke.

the 20g's are great on race gas , that when realy shine on pump gas they are not that much faster then 18gs.

if your looking to upgrade i would look into gt30s or the turbos im running from markski.they are bigger then Gt30s and spool faster the 18gs.and pull like crazy all the way to red line.
 
Old Oct 15, 2009 | 07:23 PM
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It costs only $750 or so to upgrade to 20gs... if the car is done right..... tuned and all the extra it can be very viscious( as we seen recently Bobby's old 20g car beat a alpha gt30r car...)...

a 20g takes over where the 18g dies... yet at 1.2 bar they seem close... but at 1.5 bar its a different story...
 
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Old Oct 16, 2009 | 09:23 AM
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thank you all for your answers...At 1,37bar with 100octane fuel i ran 6,32...i plan to modify intake with proto style system...and only that...no more mods...but i was just thinking of getting a set og 20g impellers and install them in my k24...mark,will the stock motor handle the extra hp of the 20gs?
 
Old Oct 16, 2009 | 09:45 AM
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Yes it will , as long as your tune is good , and you run good gas you will have no issues.
 
Old Oct 17, 2009 | 01:00 AM
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What about lag?
 
Old Oct 17, 2009 | 02:35 AM
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Originally Posted by skandalis447
What about lag?
No big deal, but these shine with boost and race gas.
 
Old Oct 17, 2009 | 09:53 AM
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El,i believe we will meet tomorrow...(you have a great P to show me) i do not plan to raise boost cause i wont open my motor to change internals...So there is no more boost for me...however under these circumstances on same boost(1,37) do you think 20g worth the difference from 18g?Mark,what is your opinion on that?
 
Old Oct 17, 2009 | 09:58 AM
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maybe a little , you need 1.4 1.5 bars on race gas for those 20gs to realy kick ***.. they pick up where the 18gs die ...

just get markskis turbos, they pull just as hard on pump gas 1 bar as the 20gs do at 1.35 on race gas .
 
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