Forced Induction Superchargers | Turbochargers | Intercoolers

347 t56 and twins

Thread Tools
 
Search this Thread
 
Old Jan 27, 2015 | 05:48 PM
  #1  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Question 347 t56 and twins

So guys sorry if this has been beatin to death but couldnt find adequate information on a setup specific to mine.

Ls1 347 (waiting to be built), t56, twin turbos. 90 % street/ weekend warrior, 93+meth/water. Goal: 900whp +/- and possibly hit a 9 second et on a good day.

* looking to see what turbos/size would be good.

Hopefully can get things narrowed down some so i can start pulling the trigger!
Thanks for the help

Last edited by BC178; Oct 26, 2015 at 06:09 PM.
Reply
Old Jan 28, 2015 | 08:55 AM
  #2  
Ryans99ls1's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (16)
 
Joined: Dec 2007
Posts: 1,594
Likes: 271
From: OH & MI
Default

If you are set on twins, twin 57s will get you 800 and spool quick. Id go in the 62-66mm range to leave me with some room to grow though. If you arent set on twins, a single precision 76mm took my car to over 800 but its not gonna take me too much farther.

You are going to need at least a 28in tire to have a chance at hooking, so id go with 3.50 rear gear. Should put you at about 145mph around 6k rpm in 4th gear.
Reply
Old Jan 28, 2015 | 09:37 AM
  #3  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

I planned to stuff the biggest tire I could on the car, do have decent suspension also to help traction.Twins to be different, spool, looks. Not sure if I'll ever want/need more hp but rather be able to then redo everything. Was thinking on3 61 mm turbos and upgrade next winter? Thanks for your advice man, I appreciate it. Btw how do you like the turbo and m6?
Reply
Old Jan 28, 2015 | 10:41 AM
  #4  
Ryans99ls1's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (16)
 
Joined: Dec 2007
Posts: 1,594
Likes: 271
From: OH & MI
Default

61's will do well. Brand is your choice.

I personally love the six speed and boost. I frankly dont care to hit the track THAT much and if/when I do, it's more of challenge to see what i can do with the car. The drivetrain is built to handle pretty much anything but its a highway car for the most part and I dont really see a need for an auto.

If i were shooting for a specific e/t, it would get an auto. If you like driving and just being an idiot when no one is around, manual all the way.
Reply
Old Jan 28, 2015 | 10:46 AM
  #5  
oscs's Avatar
8 Second Club
iTrader: (19)
 
Joined: Jan 2013
Posts: 3,903
Likes: 6
From: Cypress, TX
Default

Originally Posted by Ryans99ls1
61's will do well. Brand is your choice. I personally love the six speed and boost. I frankly dont care to hit the track THAT much and if/when I do, it's more of challenge to see what i can do with the car. The drivetrain is built to handle pretty much anything but its a highway car for the most part and I dont really see a need for an auto. If i were shooting for a specific e/t, it would get an auto. If you like driving and just being an idiot when no one is around, manual all the way.
Look at turbonetics they make a quality turbo for not a lot of cash. $6-700 range and have a killer warranty. My 66/65's spool very very well on my T56. Anything in the low 60 range will light up plenty fast on the 347. Make sure you have a good cam picked out and youll be fine.

Last edited by oscs; Jan 28, 2015 at 02:03 PM.
Reply
Old Jan 28, 2015 | 01:49 PM
  #6  
stevieturbo's Avatar
9 Second Club
 
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Default

AGP say their smallest TT kit with 54/57 turbos will do around 800hp.

Something like that should spool very well on the smaller motor. I'd be a little cautious about moving to anything in the 60mm range with your setup in mind

http://www.agpturbo.com/camaro-5-ss-agp-twin-turbo-kit/
Reply
Old Jan 28, 2015 | 06:49 PM
  #7  
DEFYANT's Avatar
TECH Enthusiast
 
Joined: Jul 2013
Posts: 617
Likes: 0
From: Okmulgee, OK
Default

I kind of agree with Stevie, but I would go in the 61-62mm range, Turbonetics make a good turbo in that range, and for a little more going Precisions would be nice. Another option would be GT35R's, Garretts, not a knock-off. Twin 62s will have the ability for 4 digit HP, and still spool nicely with the proper cam and tune.
Reply
Old Jan 28, 2015 | 07:22 PM
  #8  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

I was thinking in the 61 62mm range, I plan to have one of 2 people spec me a cam so should be good. Would actually like to talk to them as well to see what they think also. So far good info guys. Keep it coming!
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Jan 28, 2015 | 09:48 PM
  #9  
oscs's Avatar
8 Second Club
iTrader: (19)
 
Joined: Jan 2013
Posts: 3,903
Likes: 6
From: Cypress, TX
Default

Originally Posted by BC178
I was thinking in the 61 62mm range, I plan to have one of 2 people spec me a cam so should be good. Would actually like to talk to them as well to see what they think also. So far good info guys. Keep it coming!
61/62 will light up like the 4th of July with a good cam. Good luck man.
Reply
Old Jan 28, 2015 | 10:50 PM
  #10  
MertezWS6's Avatar
On The Tree
iTrader: (8)
 
Joined: Mar 2011
Posts: 149
Likes: 0
From: Maplewood, MN
Default

As far as gear ratio I would go with 3.90. There is a turbo Camaro M6 running 8's on here. I have 3.50 in my car now and doesn't 60' the best. plus its a 6 speed.
Reply
Old Jan 29, 2015 | 08:16 AM
  #11  
Ryans99ls1's Avatar
TECH Fanatic
15 Year Member
Liked
Loved
Community Favorite
iTrader: (16)
 
Joined: Dec 2007
Posts: 1,594
Likes: 271
From: OH & MI
Default

Originally Posted by MertezWS6
As far as gear ratio I would go with 3.90. There is a turbo Camaro M6 running 8's on here. I have 3.50 in my car now and doesn't 60' the best. plus its a 6 speed.
If he throws a 30in tire under the car he could do 3.90s (maybe). but if he is really making 800hp, he'll either have to shift to 5th or wrap 4th pretty damn high to get the mph that thing should be capable of.
Reply
Old Jan 29, 2015 | 11:52 AM
  #12  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

No set et for this car, hit track Maybe once a month. Would like to know it can do well tho, no point in having X hp if it runs shitty at the track= shitty on street/pulls.
I would be most likely running a 28" tire and was thinking in 3.50 range.
For fuel I'm thinking of doing the mighty mouse diy pumps, fpr, lines.?
Thanks guys excited to get this on the road. First turbo car.
Reply
Old Jan 29, 2015 | 01:48 PM
  #13  
stevieturbo's Avatar
9 Second Club
 
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Default

If it's a 28" tyre, then 3.7 or so might be fine, 26" then maybe 3.55
Reply
Old Jan 30, 2015 | 08:47 PM
  #14  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

Just purchased huron speeds twin turbo kit! Looking at 9" wavetrac, back braced, narrowed 3", x gear ratio. What would you guys suggest for fuel system? Trying to save where I can. Thanks guys
Reply
Old Jan 30, 2015 | 10:37 PM
  #15  
IronBlocked's Avatar
TECH Enthusiast
 
Joined: Jul 2014
Posts: 560
Likes: 0
Default

dual walbros 255s -6 to the stock rails and an aeromotive reg stock feed as return
Reply
Old Feb 1, 2015 | 11:59 AM
  #16  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

Originally Posted by IronBlocked
dual walbros 255s -6 to the stock rails and an aeromotive reg stock feed as return
Was planning to do mighty mouse diy. I just can't see spending $1600 on setup I see guys doing for under 800. Only problem I have is I've never done a fuel system.
Reply
Old Feb 1, 2015 | 02:38 PM
  #17  
DEFYANT's Avatar
TECH Enthusiast
 
Joined: Jul 2013
Posts: 617
Likes: 0
From: Okmulgee, OK
Default

I would do AEM 320's, -8AN Feed, and the stock feed as a return, then a boost referenced FPR, as for injectors, 127's will give you room to grow.
Reply
Old Feb 2, 2015 | 10:49 AM
  #18  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

Ordered my rear last night. S60 S-trac with 3.54 gears.
Thanks for the help so far guys. Always nice getting a few opinions before just buying stuff
Reply
Old Feb 2, 2015 | 10:52 AM
  #19  
BC178's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2011
Posts: 173
Likes: 2
From: WI
Default

Anyone use xspower wastegates/bov? Anywhere I can save a little money and can upgrade down the road would be nice. Was also thinking of running on3 61mm turbos and going better next winter. Just a thought
Reply
Old Feb 3, 2015 | 01:38 PM
  #20  
98Camarod's Avatar
11 Second Club
iTrader: (43)
 
Joined: Aug 2006
Posts: 5,364
Likes: 2
From: Summerville, SC
Default

The turbonetics 6665's spool nicely on my 347. I'd check them out if you haven't already.
Reply



All times are GMT -5. The time now is 08:39 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE