Forced Induction Superchargers | Turbochargers | Intercoolers

what size twins?

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Old Nov 13, 2006 | 10:01 PM
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Default what size twins?

Guys I posted a what size single question last week but now my customer has changed to a twin. what size twins would give me 800 rwhp good low end and be capable of 1000 hp ?
this is on a stock cube LS1 ?
Thanks again !

what flange and exhaust housing also ?
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Old Nov 13, 2006 | 10:50 PM
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Twin 67s... I am no pro, but I would assume they would get you there.

Personally going twin GT42Rs on my 408, but I need a bit more power to get my pig moving.
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Old Nov 15, 2006 | 09:43 PM
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67's really? I was thinking smaller. I would want full boost by 3500-3800 rpm

Last edited by datsbad; Nov 15, 2006 at 09:56 PM.
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Old Nov 15, 2006 | 09:53 PM
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Ok... well how about twin GT35Rs then!
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Old Nov 15, 2006 | 09:54 PM
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TIAGO has twin 70's on a stock cube and is @1000hp...he posts on here im sure he'll chime in
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Old Nov 15, 2006 | 09:55 PM
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I got to say I am not up on the turbo sizes and all . There are way to may for me to learn that quick !
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Old Nov 15, 2006 | 10:04 PM
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if you go to the forced induction.com website, they have a terrific turbo chart that explain everything,
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Old Nov 16, 2006 | 07:41 AM
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I had T61's on my stock cube engine. with p-trim exhaust wheels and .68 ar t-4 housings, it made full boost at 3800.
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Old Nov 16, 2006 | 08:38 AM
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if your only wanting 800rwhp and spooling early, something like a gt35 or smaller then a 60mm (like 58-60mm)
i think the high output incon turbos could do 700rwhp (gt28 hybrids right) so something a little bigger then that.
Edit: missed the part that you wanted to be able to hit 1krwhp so youll have to use something bigger then a 60mm like Harlan ays below.

Last edited by smokinHawk; Nov 16, 2006 at 10:00 AM.
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Old Nov 16, 2006 | 08:52 AM
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How high does he plan to spin it?? That will dictate turbo sizing as well.

Mid 60 mm minimum if he plans to hit 1K RWHP. Even a pair of 67's will be working pretty hard at that point, you'll trade spool for efficiency though.

70+ units will be a little lazier, but you'll make more power with them just keeping the charge temps down.

been there, done that
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Old Nov 16, 2006 | 11:03 AM
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Here's a graph from another forum member running a couple Precision T44's which were modded to T52's (i think) on a top-mounted setup, stock cubes..




Looks to be ideal to me!!


Arnel
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Old Nov 16, 2006 | 11:18 AM
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Originally Posted by AVB
Here's a graph from another forum member running a couple Precision T44's which were modded to T52's (i think) on a top-mounted setup, stock cubes..




Looks to be ideal to me!!


Arnel
Those were the units I believe Jose and Jason customized for Nick Y. in his C5 auto Vert. Those turbos went 9.9's@145+mph on regular wheels.....amazing. Now Jose built him some new custom ball bearing units that are even larger that spool the same.......should be a wicked setup.
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Old Nov 16, 2006 | 11:20 AM
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Go with a set of T61 DBB's. We have had good sucess with them on our customers cars. Same as a GT35R but without the price.
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Old Nov 16, 2006 | 11:34 AM
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Originally Posted by DrTurbo
Go with a set of T61 DBB's. We have had good sucess with them on our customers cars. Same as a GT35R but without the price.
Welp... there you go!
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Old Nov 16, 2006 | 11:41 AM
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Originally Posted by DrTurbo
Go with a set of T61 DBB's. We have had good sucess with them on our customers cars. Same as a GT35R but without the price.
Are those the Turbonetic units that Nick just swapped to? If so, I just got my set yesterday and installed them last night!!! Anyways... that graph is Kevins.


Arnel
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Old Nov 16, 2006 | 11:51 AM
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Yes, he went to a set of T-netics that Jose had speced for him. Looks like they will be killer units.
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