View Full Version : GXP Twin Turbo Project coming along...

06-21-2011, 07:34 AM
Hey guys,

I've been at work on this car for a few weeks now. We built headers and exhaust for this car right off the showroom floor for the customer, BEFORE the title was signed over. The customer has enjoyed the car for two years and wanted to take the next step. He jumped a mile.

My primary build goals throughout the process:

-No cutting or permanent modifications of the chassis.
-Build as an efficient setup as possible while adhering to the first goal.


58/62mm Precision Billet Vband turbos. Went with B covers in order to fit between the engine and frame "rails";
TiAL MVS wastegates;
LoveFab Turbo Manifolds - places the turbos high enough for a gravity drain back into the pan;
LoveFab Twin-core Water to Air Intercooler. Only modification to the car is the upper radiator hose.
62lb injectors
Hobbs switch, inline pump.

I am finished with fabrication and will begin the full installation today.

Pictures of some of the process:

Bulky stock motor mounts won't do: 110_n.jpg

Ah...clearance... 533_n.jpg

Drivers side manifold, turbo, WG, DP/DT combo. Yep, its tight! 837_n.jpg 06_n.jpg 947_n.jpg 320_n.jpg

Early mockup stages: 822_n.jpg

Dual-Core WAIC: 904_n.jpg 341_n.jpg 67_n.jpg 959_n.jpg

Charge piping built: 818_n.jpg

Air filter tubing: 38_n.jpg 104_n.jpg 263_n.jpg

Undershot: 622_n.jpg

I will update as the car comes together. Tuning before the weekend.

06-21-2011, 11:53 AM
That is fucking nice. No joke.

06-21-2011, 01:58 PM
That is fucking nice. No joke.


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06-21-2011, 05:52 PM
those filters are tiny!!

06-21-2011, 11:58 PM
Very nice! Thats going to be a blast to drive.

06-22-2011, 12:34 AM
Pretty cool!

06-22-2011, 10:05 AM
Nice work! What kind of power numbers are you aiming for with the setup?

06-23-2011, 08:03 AM
Thanks guys!

We aren't going for the moon here, maybe 550-600WHP. I think this can be reached at just 5-7psi, though I'll know for sure.

The customer doesn't want issues with engine or drivetrain so I figure this is a good way to start.

If we crank up the boost, larger filters are an easy modification. For now, they will flow plenty of air for the power we are shooting for.

06-23-2011, 10:17 AM
Wow that's gonna be one seriously sick ride. The owner obviously has a healthy disposable income.

06-23-2011, 11:06 AM
Looks good! Bet it will be fun when completed!

06-23-2011, 11:19 AM
Here's a quick snapshot of the setup mocked up off of the car: 723_n.jpg

06-29-2011, 03:08 PM
VERY Nicely done! :cheers:

07-02-2011, 08:41 AM
Fuel system complete. Boost controller and wideband wiring almost complete.

I will be installing heat shields on the turbo manifolds this morning before the Dyno this evening.

07-02-2011, 10:50 AM
very nice

07-02-2011, 12:49 PM
That is insane. That thing is going to be a beast!! Can't wait to see the results!

07-03-2011, 10:51 AM
:corn: looks efficient for sure

Beaflag VonRathburg
07-03-2011, 09:03 PM
That intercooler is super cool looking. I really like the way you guys have everything put together.

07-04-2011, 10:00 PM
Damn... Do I even want to know what a setup like that cost?

07-07-2011, 09:59 PM
Damn... Do I even want to know what a setup like that cost?


07-07-2011, 10:00 PM
Fuel system complete. Boost controller and wideband wiring almost complete.

I will be installing heat shields on the turbo manifolds this morning before the Dyno this evening.

"This evening" was 5 days ago. What's the word?

07-08-2011, 06:21 PM
542WHP and 600+WTQ at just 8psi on a Mustang dyno. The tires were spinning at peak torque(3700rpm). Graphs up soon.

I was REALLY crunched with time, struggling with EFILive as it was my first time using it. I figured it out the morning the customer demanded the car(WHEW!!!) and had the car conservatively tuned in under two hours.

Two problems:
Fuel pump was pegged at 8psi. Tried a 9psi run and had to abort due to plumetting fuel pressure.

Snow tires were still installed on the car(its his daily driver!!!). These were a huge drawback for power getting to the ground.

Three days later the customer is reporting nothing but great results! I'm thinking he will adjust to the crack pipe and be back soon for an addtional fuel pump.

07-08-2011, 11:46 PM
Very nice results. With a proper fuel pump it should make over 600rwhp at around 10# with no problem.

07-09-2011, 07:53 AM
Easily. I don't know if it's because I was on low quality 92 octane, but the car liked timing down around 12 degrees. I was hoping to run up around 15-18, but the car likes what it likes.

07-09-2011, 08:30 AM
Baseline pull at 8psi: 399_n.jpg

After timing adjustments, tires started spinning at 8psi: 60_n.jpg

9 psi attempt. Tires spinning, fuel pressure dropping, so the run was aborted(good thing!): 187_n.jpg

07-09-2011, 05:46 PM
How do you plan on keeping IATs reasonable without constant filling that intercooler with ice?

07-10-2011, 07:48 AM
These aren't transmission coolers.... 727_n.jpg

07-10-2011, 10:08 AM
I know they aren't. You think that will be enough? Dumb question I guess, you obviously do :)

07-10-2011, 10:09 AM
Do you have any detail pics of the coolers?

08-09-2011, 09:51 PM
being new to michigan i wouldnt mind swinging by the shop and seeing some of that work in person.

08-09-2011, 10:31 PM
Wow, nice work.

08-24-2011, 12:40 AM
After timing adjustments, tires started spinning at 8psi: 60_n.jpg

Wow, I know dynos are different, so it may have something to do with it, but I thing the extra displacement is the big difference in that car and mine. I'm running 8.5psi and 93 octane. The torque on that car is 150ftlbs higher than mine at the 3385 mark. Very nice.

09-12-2011, 10:44 AM
Thanks!! I sized the turbos to the customer's needs as well, ie, pretty small.

The customer called me with a big exhaust leak concern; my heart dropped. Come to find out, he ripped a Vband clamp off going through a carwash. All is well! I'll be stopping by to check his tune in the next week, as it's getting cold, I want to make sure everything is functioning as its supposed to.