68 Camaro Twin Turbo, Twin intercooled, Fuel injected LT1 project

So this just proves that no project is ever done! Original plan was to build a new 383 with LT4 heads and intake, and one of the NX foggers.. for some reason I decided to try the turbocharged route instead. Guess I am tired of refilling bottles! Just for kicks, I added a couple pics at the bottom of some 4th gen turbo cars .. check them out

11/01/04 update...
Got the thing back together, and working out the tune.
Here is the current combo:
350 standard bore 9-1
LT4 ported intake and heads
TRW Forged blower pistons
CAT 5140 rods
Eagle 4340 crank
47# SVO injectors
58mm TB

After some initial gremlins in the tune and one turbo, it is coming around. Currently running around at 16.5 psi on 93 octane. IAT numbers under boost are at 158 (off boost is reading 110 on a 92 deg. day).
How does it drive? Well, cruising along at 45 mph the gauge reads -15 vac. Punch it and it jumps instantly to 15-16 psi boost. I mean instant. I'll get a video of the boost gauge soon!
Plug readings say everything is happy, and now I am in search of traction. Once I get a couple more tune issues fixed, I plan to reduce the boost back to 7 psi, and try the 100 shot. More news as it happens!
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Here are a couple shots of the exhaust and turbo mounting, the "downpipe" turns down, and back to the existing 3" duals. The turbo mounting flanges were fabbed from some 5/8" steel plate, and required some minor mods to the header collectors to match up.

This is the front of the motor, I am using a couple "Cobra" elbows to make the bends into the turbo inlets. You can also see the outlet side pointing down. The pipe will make a 90 degree bend to the side, then around the side of the radiator to the front mounted intercoolers. To help the intercooler piping stay on at higher boost levels, I cut a thin slice of pipe, and welded it to each end, to make a "lip" to help out the hose clamps. You can also weld up a small bead to achieve the same thing.

This is a detail shot of the turbo flange I made, and the mods to the header collector I needed to make it fit. The other shot is the inlet tube I am using to get the air from the intercoolers. It is a 3-1/2" pipe, with a hose coupling to 4" for the TB.

Finally! The twins have arrived.. still have much to do, but I can see some progress! You can see the mounting of the turbos, and the partial piping on the intercoolers to TB. I used my old airbox, trimmed and modified to mount a pair of K&N filters. On the passenger side, the downpipe is partially done, it will tie back in to the existing 3" duals.

This is the basic mounting of the twin Saab intercoolers. It is all 2-1/2" pipe, into a 3-1/2" leading to the throttle body. The BOV is mounted under the 3-1/2" pipe, just in front of the TB. I had to move the radiator forward, and down, to get stuff to fit, but the hood still closes! The other pic is of the side routing of the pipe from the turbo to the intercooler.

Here are a couple of pics of the intercoolers, thru the grill openings. They ended up a little closer together than I wanted, but you have to fit all that piping and stuff in there! Gets a little crowded.

This is the finished product, other than the oil lines on the turbos. After test and tune, the headers and downpipes will be sent in for coating. The O2 sensors are mounted just after the turbo outlets, one is for the DFI, the other runs the A/F meter.

Shots of the front and drivers side. Everything fit well, but I can see that some heat sheilding will be needed. I already plan to get the turbo wrap like the GN's use.

Currently, the car has a 97 LT1 f.i. motor in it. The fuel system is Aeromotive, ignition by MSD 6BTM, and an Accell DFI controls it all. So I was basically set up for the turbo project, other than the turbos and stuff. Toughest part was deciding on which turbos to run, since the goal of this project is "junkyard", low budget.

So here is what I ended up with, a pair of turbos off a GM 6.5 turbo diesel. These are set up around 7 psi, and I have seen guys running them up to 18 psi, so it should move more than enough air. Air inlet is 3", outlet is 2-1/2", which matches the intercoolers I have. It also has an exhaust outlet of 3", which matches my existing duals.

Here are the intercoolers I will be using, they are off a Saab. 2-1/2" inlets/outlets match up well, and they will fit behind my lower grill openings perfectly. They are aluminum/plastic, light weight, and are tested to 26 psi, which is more than I will be running (?)

Here is my blow off valve, to relieve excess boost pressure. It is a Greddy Type R, with the heavy spring. I looked at smaller ones, but they didn't look like they would vent enough pressure.

This is the adjustable controller I picked up, to control the wastegates on the turbos. It is a ball and spring design, which should keep the boost at a steady level. This will work on any turbo car to adjust the boost, contact philip485@hotmail.com if you need one!

The plan was to use upside down "block hugger" headers, but it turns out there just wasn't enough room on the drivers side. I ended up with some S10 small block headers, which will mount the turbos in front of the motor. I have an old airbox I used to run with the carbed motor, so I just modded it to fit a pair of K&N filters. Outlets on the turbos will be 2-1/2" to the intercoolers, then 2-1/2" to 3-1/2" y-d together, and into the TB.

Here are a couple 4th gen f-bodies with twins, one is done, the other is under construction. The car on the left belongs to Keith Measey, on the right is "zturbo" white race car.. both are from zturbo's site. Just a couple more ideas of where to put stuff, and how much you can spend on these kinds of projects!