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Do bigger turbos make more power?

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Old 01-11-2012, 11:52 AM
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Hoping to have some t6 numbers here soon...
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Old 01-11-2012, 06:46 PM
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Originally Posted by 00Z71
That will be nice info....
But actually, IIRC, the Pt88 and GT91 have the same size exhuast wheel
The gain should come from going from t-4 flange to the t-6..
Yes they have the same wheel but the large frame housings are BIGGER! On exhaust side and cold side, MORE AIR!! More Volume= More Power! geeze lol
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Old 01-11-2012, 07:05 PM
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True if you have maxed the smaller setup out. I question the trend were guys want to swap out 1200-1400hp turbo's when their making 700-800 to go bigger. I understand free/swap testing, but to be paying for it just doesn't make sense to me.
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Old 01-11-2012, 07:10 PM
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Just like anything there is optimal and retarded on a setup
Just like a bigger cam isn't always better.
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Old 01-11-2012, 08:25 PM
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Originally Posted by Blak92
I picked up 10mph in the quarter going from a TC76 to a s400sx3-75 with 2# less boost. Exhaust side and compressor cover plays a big role obviously.
I picked up a solid 5mph going from both a Tc76/.68 to a Garrett GT76/94/T4 with 1~2 psi less boost as well. The tc76 prob wasn't choking my 6.0L as bad as your 408 but still that's a big gain for same MM compressor, and less boost. The GT76 maxed out will put a solid 10 mph on the TC I think...
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Old 01-11-2012, 08:32 PM
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Originally Posted by foose04
True if you have maxed the smaller setup out. I question the trend were guys want to swap out 1200-1400hp turbo's when their making 700-800 to go bigger. I understand free/swap testing, but to be paying for it just doesn't make sense to me.
X2. What impresses me is compressor mm vs weight vs power shown down the track. You're doing pretty damn good with that 72mm.
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Old 01-11-2012, 08:35 PM
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Originally Posted by tarinitup
My 91 hit 9.8 on 18 psi and ran out of time and fuel to push it further but it showed no sign of stopping and was gaining 2 mph and dropping a tenth with every turn of the boost controller. 00z71 had tranny problems on same day but I believe he's gone 10.5@ 14psi. Im happy with 91 but just want to try a smaller one for comparison. The smallest I've tried was a gt88.
How did the GT88 run? That's probh going to be my next turbo once I max out the GT76.
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Old 01-11-2012, 09:05 PM
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Worked great until i killed it with -3 Oil feed line . when time came to buy new the 91mm was only $150 more so I upgraded lol.
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Old 01-11-2012, 09:25 PM
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Originally Posted by tarinitup
Worked great until i killed it with -3 Oil feed line . when time came to buy new the 91mm was only $150 more so I upgraded lol.
Ouch! I have a -6 supply and a -12 return on this large frame turbo..... My 88mm to 91mm didnt cost me a dime once i sold the 88
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Old 01-11-2012, 09:47 PM
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Originally Posted by Swerve7rpm2000
Ouch! I have a -6 supply and a -12 return on this large frame turbo..... My 88mm to 91mm didnt cost me a dime once i sold the 88
$1450 in stupid tax. But people on forum swore -3 was enough. Should have known better since no one had big turbos at that time.
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