Twin Turbo LS (no joke!)

pektel

pektel

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For those who never read the HP forum:

SPSully said:
Ok so I briefly mentioned it before. This is the turbo part of the build thread for my Lincoln LS that I am twin turboing.

My intentions were to twin turbo with rear mount turbos. After closer investigation, the ball bearing turbos I want to use are liquid cooled so I need to move them closer to the front. There is room where the cats are to bolt them directly to my exhaust manifolds in a traditional low mount set up. There also is room to pipe my intake filters to the front bumper to get them away from the heat. This setup will also make it possible to run pretty much any exhaust I want. The bigger the piping the better. Back pressure issues become a thing of the past. Turbo physics actually want less pressure after the turbine so I could run 6” exhaust if I wanted and only see gains.

I've looked at the fuel system upgrades needed and I believe them to be solved. I have already upgraded from a 255gpm fuel pump to a 510 to support my nitrous. I also have been looking at the fuel injectors. The first gen LS's have air assisted fuel injectors to help them pass the cafe standards in the states during those years. The way it works is the injectors pass through an "air rail" in the intake manifold that blows air through the injectors to help with the atomizing of the fuel. This becomes and issue with getting a proper seat out of a traditional fuel injector. After looking at a few different things I am confident that I can make that work with some minor capping and such. My biggest concern is the nose seating right inside the intake. Barring any major issues, I'll be using 60lb injectors to support the fuel needs of a hopefully 500+rwhp car. The other issue I am going to have that is fuel related, is the MAF. SCT makes a MAF that will support up to 1000hp depending on the size of the tubing its in. That solves that problem. And with my SCT Livewire as my programming device, tuning just requires a skilled tuner.

The stock internals of the LS are believed to hold up to 7-8psi before having too much wear and tear added to the car. I plan on running 5psi to break in the turbos, then turning it up. To do so I will be using a water/methanol injection system to supplement my fuel system and FMIC. The methanol will add to the octane of my fuel and greatly lower the intake air temperatures, effectively cushioning the effects of the boost on the motor. Its colder air temps also make for increase in power. I plan on running the methanol on a progressive controller that is pressure activated. Basically I’ll be able to start the meth at x psi and ramp up to the full size of the jet as the pressure increases. By adding it to the intake piping prior to the IAT sensor I can also tune a fail safe in the event the meth doesn’t spray properly. The theory is the IAT will see an increase in temp and retard the timing to avoid detonation.

This is all drawing board math right now as Im sure that actual numbers will vary here and there. I suspect the transmission wont like that kind of power, so further tuning will be needed as well as a possible rebuild kit. Other things are in the works to assist the turbos in their quest to make this one seriously mean street machine such as an upgraded throttle body, and regrinding the stock cams. I'm not sure where those paths will lead yet, so I dont want to take them into consideration at this time.

I'll continue update the thread as I go so that those who dont know squat can learn and those who do can drool and offer up advice.
Click to expand...
 
The Diesel M5's had a twin turbo setup, though not quite the same as this one Sully has set up. The D-M5 has 2 turbos, a small turbo that has no lag for power until the big a$$ turbo kicks in.
 
+1 blue is right

the M5 is a twin turbo and they blow the walls off when in the "M" mode. One reason why I hate BMW...why make a fast car if you need a "M" button to activate the damn power. This ain't the ludacris speed BMW.....it is not!
 
The (current) M5 is a naturally aspirated V10, Pete. No turbos in stock form.
 
Sully is an animal. A small docile animal, but an animal none the less.
 
why twin turbos with on 7PSI? Not starting anything just asking.

I run a single turbo running 21.5PSI on my Speed6 with 420+ HP at the crank with fast spool and boost holding all the way to 6700 RPM's. A single properly sized turbo will more than fulfill what you are trying to accomplish.
 
not so much. I actually save plumbing by being able to move them up front. Plus the twins will support my future plans better
 
you will still ahve a lot of plumbing to do to get a front mount in there too.
 
ehh the fmic has to piped in there for single or twin.... no biggy



and if you look at the rear bumper it looks like it has a thong
 
SPSully said:
and if you look at the rear bumper it looks like it has a thong
Click to expand...

Oh that part! YES it does. Im not crazy about the car,

1. good on gas (when not in boost)
2. way fast
3. tons of traction in winter with AWD
4. lots of aftermarket support
5. easy on my wallet with repairs and monthly payment.
6. enough room to get my kids around

But in the end its a economy car.
 
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