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Turbo sizing
Old November 30th, 2018, 12:30 PM   #1
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Turbo sizing

How's that for my first post... First of all, hello everyone. Last year I was fortunate to finally buy my all time dream car, 1999 black gts. I knew that down the road twin setup was on a bucket list.

Ive built few turbo setups before on forgein cars and always sized my turbos based on other people builds. Vipers being scarse, especially turbo builds, its hard to choose a particular turbo for my build.

Things Im looking/hoping for:

1. Utilize stock forged motor
2. Utilize stock t56
3. Footwell mounted twins
4. Shooting for 1000hp with e85
5. Optimal turbo size for the given 1000hp goal eliminating as much lag
6. Compact turbo for clean mounting

Seeing the variey of kits offered in the past and as of today I have hard time choosing the proper size turbo. I dont need room for advancement if I can achieve 1000hp on a stock bottom end so IMO choosing the smallest turbo to achieve this goal is the way to go for me.

If anyone could give me any point outs in terms of turbo size I would greatly appreciate it. Also, do any of you have contact info for Paolo Castellano? Im trying to get a set of his manifolds to get this project going.

Thanks guys.
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Old November 30th, 2018, 09:17 PM   #2
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Quote:
Originally Posted by Domantas View Post
How's that for my first post... First of all, hello everyone. Last year I was fortunate to finally buy my all time dream car, 1999 black gts. I knew that down the road twin setup was on a bucket list.

Ive built few turbo setups before on forgein cars and always sized my turbos based on other people builds. Vipers being scarse, especially turbo builds, its hard to choose a particular turbo for my build.

Things Im looking/hoping for:

1. Utilize stock forged motor
2. Utilize stock t56
3. Footwell mounted twins
4. Shooting for 1000hp with e85
5. Optimal turbo size for the given 1000hp goal eliminating as much lag
6. Compact turbo for clean mounting

Seeing the variey of kits offered in the past and as of today I have hard time choosing the proper size turbo. I dont need room for advancement if I can achieve 1000hp on a stock bottom end so IMO choosing the smallest turbo to achieve this goal is the way to go for me.

If anyone could give me any point outs in terms of turbo size I would greatly appreciate it. Also, do any of you have contact info for Paolo Castellano? Im trying to get a set of his manifolds to get this project going.

Thanks guys.
6266, or 6766. I have 6766 and they have very little lag and pull hard throughout the powerband, i have heard the 6266 will start to fade at the higher rpm's.
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Old December 1st, 2018, 01:00 AM   #3
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As for 6766's I would assume most run "E" compressor covers with 3.0" inlet/2.0" outlet?
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Old December 1st, 2018, 10:28 AM   #4
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A stock engine and stock t56 are not going to last very long at 1000 whp.
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Old December 1st, 2018, 10:18 PM   #5
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Why 1000 rwhp? Why is that the goal ?

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Old December 2nd, 2018, 01:52 AM   #6
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Well, my best justification for wanting to hit a 1000hp mark is ego more than anything. I am very much aware (based on information online) that 1k on stock forged bottom end and t56 is pushing the limits, but on the other hand Ive heard more guys achieving 1000hp than ones trying and ending up granading a rod.

If t56 goes, 6060 would follow but for now I would like to keep the stock bottom end as is. Compression numbers are very good and I really dont want to tear it up any time soon.

Thanks guys for trying to help a new fellow here.

So far the plan is 6766 .82 A/R V band in/out. Do you guys think I should stick with E cover (3" in, 2" out) or would that be restrictive in any way? Im trying to stay as compact as possible but still have 1k capable setup.
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Old December 2nd, 2018, 02:19 AM   #7
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Your axles will go first. At minimum you better grab that set of 800hp Unitrax in the fur sail section. Price is a bit high, you can typically pick them up off ebay for under $200 a piece if you're patient.

I've been through many stock axles with just under 800ft/lbs of torques. I haven't twisted a Unitrax yet, but I'm waiting.
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Old December 2nd, 2018, 02:23 AM   #8
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What are your plans for tuning and intercooler?

The good news is even if you don't make it to 1000rwhp, 800 rwhp is a BLAST to play with on the street.

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Old December 2nd, 2018, 10:48 AM   #9
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Yes, rear axles are on the list for sure.

As far as management and fuel, whatever my tunner wants me to run. Probably AEM V1 as I like the plug and play aspect of it. As for the intercoolers im steering torwards water to air setup. Ive had issues with front mounts on my previous builds and I want to keep my fog lights intact so side mounts are no go.

Yes, the goal is to have a setup capable of 1000whp but run it at ~800ish reliably. One dyno pull and few highway runs on high boost is all I want that 1000 for.
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Old December 2nd, 2018, 12:12 PM   #10
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Your axles will go first. At minimum you better grab that set of 800hp Unitrax in the fur sail section. Price is a bit high, you can typically pick them up off ebay for under $200 a piece if you're patient.

I've been through many stock axles with just under 800ft/lbs of torques. I haven't twisted a Unitrax yet, but I'm waiting.
If you can get the Unitrax axles for $200 each you better jump on it because they are $1300 brand new. I did a google search on prices on them and one of the last sets i seen on the Alley "per quick google search" sold for $700.00 and they were dinged up possibly needing a new cover. The last set i seen sell for $400 was in 2011. I lowered my price to $750.00 shipped if you are interested let me know.

But I second the need for axles, they WILL break. I broke my factory ones when I had only 500 rwhp.
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Old December 2nd, 2018, 03:11 PM   #11
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SPT has a new set with new u-joints and straps for $925, although I don't know how much they charge for shipping.
Performance Half shafts (Unitrax)1992-2002

They do occasionally pop up on ebay for cheap - if I don't get them first. I've been hoarding half shafts like cam sensors. Cheapest one I got was $75 from a seller who was clearing out an estate listed as "short driveshaft". His dad didn't own a Viper, so who knows where it came from, and why he only had a single unit.

But if you're going to be doing 1,000whp all day every day on sticky tires, the 800hp axles may not last long. You may need to step it up to 1200hp axles like these http://www.driveshaftshop.com/domest...ith-diff-stubs
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Last edited by dirtbag; December 2nd, 2018 at 03:27 PM.
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Old December 2nd, 2018, 05:35 PM   #12
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I have an aem if interested
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Old December 2nd, 2018, 05:35 PM   #13
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If you are going 1000rwhp upgrade to better shafts than the Unitrax, I upgraded to the DSS axles when I went TT (hence why I am selling my axles) but be weary the next things to break with be the rear diff, transmission, or the rear batwings/pinon bracket.

BUY an upgraded pinon bracket, Todd at AC Performance has a CNC'd solid one, otherwise you will have a lot more expenses.

Just remember as you strengthen parts the next weakest one goes, so if you keep everything stock but then get axles that will not break then the next part will break which could be lots more expensive then a new axle.
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Old December 2nd, 2018, 07:48 PM   #14
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I have a set of the Titanium 1000 HP axles for sale. PM me


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Old December 3rd, 2018, 10:09 AM   #15
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This is news to me... just last night I realized there are few manufacturers offering as what some call symetrical or reverse rotation turbos. Here are few reverse orientation options offered by Garrett, all available in .61, .83 or 1.01 A/R turbine housings. I can see how these would be superior in regards of fitment and ease of fab work.

GTX3071R reverse rotation
GTX3076R reverse rotation
GTX3576R reverse rotation
GTX3582R reverse rotation

Turbine options: 61, .83 or 1.01 A/R

Thoughts?
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Old December 3rd, 2018, 10:22 AM   #16
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GTX3582R with .83 AR?
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