DOC Race 350Z turbo kit in the making!!

[T.O.D.]

Hey there guys, I'm working on a single turbo kit for my 350Z and wanted to show some progress. I wanted to build a kit that was simple yet effective making it user friendly and can be installed with just regular tools. You will see that the kit was built and installed on jack stands, no pulling motor needed. I did tons of research before even attempting to design and have came up with a kit that fits my needs perfectly. Here are a few key points I wanted to incorporate when building the kit.

- Must use T4 flange
- Capable of making 450whp with base turbo kit
- Upgradable to twin turbo
- Keep heat to a minimal (deathly afraid of engine fires)
- Simplify kit without sacraficing quality and function

Talking to techs at Horsepower Freaks and Precision Turbo, they suggested using a PT6766 CEA. It is a 935hp capable turbo that uses similar size housings as GT35R. I wanted to make sure the kit can make 450hp and still have room to play so the 6766 should be plenty for now. It's a small turbo that packs a big punch.


After seeing some of the front mounted turbo setups, I chose to go towards rear due to my fear of engine fire. I have seen turbos and piping get red hot on dyno pulls. It scares the hell out of me to think of something that creates that much heat stuffed into such a tight area.

Off to some pics. The main piece connects the left bank header to the turbo, we'll call this the turbo elbow. It also has a v band to connect the right bank exhaust. I wanted to make sure exhaust flow was not compromised so I did my best to make a T4 exhaust housing work. Turbo placement is not final but it gives me a good starting point. So far I've been daily driving with this exhaust housing on for 3 weeks with absolutely no scratches. I am lowered 1.75" btw.

[T.O.D.]

Here are some shots of the downpipe. I figured I would build it with check engine light eliminators in case I wanted to mess with them down the road.



Some shots of the turbo elbow installed with the downpipe. As you can see I capped off the wg and turbo cartridge because this is my daily driver and I have to keep it on the road as I build the kit. With the wastegate so close to the downpipe, it makes doing a dumptube or recirc simple and out of the way.



After the elbow and downpipe were done I started on the crossover pipe. I wanted to make sure it flowed enough to make some power so I used 2.25" stainless tubing. Paying close attention to available room and performance, we reworked the wiring harness to give extra room.




This made it possible for a crossover pipe with no extra bends or kinks and it won't melt your wire harness.

[T.O.D.]

Some pics of the pipe installed





And one showing the path it takes to get to the other side. Should be able to make some good power with different headers installed

[sleeper108]

damn! what's the price point going to be on something like this? (manifold vs kit)

[T.O.D.]

no price point yet because the kit is still in development.

[Djtyfightr]

looks sweet

[T.O.D.]

Started building the intercooler for the 350Z turbokit. We're using a vertical flow core



This core will still support up to 800hp



We made our own brackets for the intercooler to mirror the factory bumper support for strength and a factory fit. Some minor changes were made to allow the PS cooler, horn and airbag sensor to still fit factory. We designed a relocation bracket for the cooler and also modified a few other components to work (more details are logged @ D.O.C. Race | The Opportunity to Perform







I'll have some more update pictures this evening. We also started designing the DOC VQ Intake Manifold to complement the newly found boost....

[Highway Riding]

Nice work.. Been following on my350.. Keep it up bro!

[T.O.D.]

Finished one of the inlet pipes for the intercooler and got everything mounted.

[T.O.D.]

The entire turbokit build and more is here DOC 350Z and is continuing to move along well.

Since then we mounted the oil scavenge pump and actually slipped the turbo cartridge on so everything is lubricating and functioning correctly. Next will be the upper intercooler inlet pipe and installing the blow-off valve...

[Corbic]

Some clever ideas. I hope it pans out and is inexpensive. There is a lot on the market anymore in the $4,000 - $6,000 range.

Also, if you really are targeting the "cheap" crowed, IIRC 400whp is the recommended max for a stock VQ motor.

That would be more than enough to bring the car to life considering a stocker is in the 240whp range.

Good luck - keep us updated.

[project-D180]

look good my man!!!keep us in the loop,i cant wait to see the finished product

[T.O.D.]

Been keeping busy on the Z kit, got the upper intercooler pipe finished and added the blow-off valve flange. Everything is plumbed in boosting 4lbs on wastegate spring, next will be the fuel surge tank, some custom fuel rails and dyno tuning!

DOC Race Turbo Z

[T.O.D.]

Ordered up the ECU for the Z, should be here in about a week.

In the meantime, we started to build the VQ35DE Headers. These are going to be an upgrade to our Turbokit, but will have plenty of benefits for guys staying NA...

[sexcii-zenki]

very nice kit but too bad i decided to change my setup...but if ur prince range is good ill def hit u guys up

[T.O.D.]

Let us know, we still have a month until were going to release any of these parts so pricing will be determined this month sometime.

[Kingbaby]

where's the HR love?

[T.O.D.]

It's only suiting for our first 350Z turbokit to be built with the DE, maybe the HR kit next.

[T.O.D.]

Both bank headers are finished up.....

[T.O.D.]

Got the Haltech in and the adapter harness...

[project-D180]

niiice ..do u have a vid of this runnin n dyno #'s yet

[T.O.D.]

Were starting to work on the fuel system now, we did some tuning at 4psi with the factory system. We took a little video of the low boost stuff i'll put that up this week

[mewantkouki]

No VQ35hr love..?

[T.O.D.]

Definitely HR love, would like to see some DE numbers first though!

[eytsics]

very interested to see how this thing run.

[T.O.D.]

Been super busy haven't had a chance to get moving on the fuel system just yet, but we got injectors and a pump ready to put it together...

[Z33dori]

very interesting approach.

good luck, looking forward to the numbers to compare to the other kits out there

[T.O.D.]

Fuel system is still in development, but had a chance to get some full undertray shots of the kit layout..



Car has been scraping framerail ride height to road test all the components clearance





Cross-over pipe is nice and heat cycled

[slamn240]

this is fnnnnnnnnn sickkkkkkkk good work i hope you had something for a 07 350z HR motor......if so pm me asap

[T.O.D.]

Nothing for the HR at this time