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2 Big Single's?

Old 05-19-2004, 03:11 AM
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Why aren't people trying this setup? Is it because of spool up time, more heat, more money, more **** to break, or more back pressure?



I realize that's it's probably all of those and that 13B's would have a hard time spooling two GT30/37's without some huge exhaust ports but wouldn't it still be possible?
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Old 05-19-2004, 07:52 AM
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Unless you come up with some crazy, vacuum and solenoid driven, exhaust gas flow directing mechanism, you spend too much time to left of the surge line.



Howard tried an interesting experiment with some decent sized singles but they were below (left) of the "line." Never spooled them up.



So, you would have to flow some HUGE numbers, or at an insane VE, to get them to come on at a decent RPM.



I dunno.
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Old 05-19-2004, 01:44 PM
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I thought so, would it be safe to assume that a 20B could spool those turbo's at decent RPM's?
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Old 05-19-2004, 01:54 PM
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Anyone have any flow numbers for a 20B? I assume it's 50% greater than a 13B. Hmm. I'll chew through the math and post some numbers on some well know compressor maps.



Hmm. The more I think about it, the more I think that a GT42R on a 20B would KICK SOME ****! Gut instinct from running a GT40R on a 13-Brew.



Anyone have any VE numbers for a 20B?
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Old 05-19-2004, 06:20 PM
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Originally Posted by Srce' date='May 19 2004, 05:11 PM
Why aren't people trying this setup? Is it because of spool up time, more heat, more money, more **** to break, or more back pressure?



I realize that's it's probably all of those and that 13B's would have a hard time spooling two GT30/37's without some huge exhaust ports but wouldn't it still be possible?
All of the above. I have a 1/2 bridge motor that says they will spool quick enough. I tell you what, you buy and I'll try. I'll even put it on the dyno, so you can see full boost at 6,000rpm's and shift at 11,500.
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Old 05-19-2004, 07:25 PM
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igy didnt you used to have a twin (single) turbo setup?
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Old 05-19-2004, 10:11 PM
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Originally Posted by IGY' date='May 19 2004, 06:20 PM
All of the above. I have a 1/2 bridge motor that says they will spool quick enough. I tell you what, you buy and I'll try. I'll even put it on the dyno, so you can see full boost at 6,000rpm's and shift at 11,500.
LOL, I was pretty sure they'd boost nicely by 6K, but how long would that motor last? And IGY please remember, I'm in the states, and can't afford a rebuild every week.



Originally Posted by Badog' date='Posted on May 19 2004, 01:54 PM
Anyone have any flow numbers for a 20B? I assume it's 50% greater than a 13B. Hmm. I'll chew through the math and post some numbers on some well know compressor maps.



Hmm. The more I think about it, the more I think that a GT42R on a 20B would KICK SOME ****! Gut instinct from running a GT40R on a 13-Brew.



Anyone have any VE numbers for a 20B?


Thanks man, I'd really appreciate some concrete numbers.
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Old 05-20-2004, 05:11 AM
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you looking for something like this source?



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Old 05-20-2004, 06:54 AM
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That TII manifold is going to choke it some...no?
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Old 05-20-2004, 02:57 PM
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That's exactly what I'm looking for.
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