[9986paulk]

I just wanted to put a thread together since I'm putting the twin turbo kit on my car (whit00stangers kit with new turbos and some other fixes). The kit needs a little bit of work to function it's best and I'll document it here as I make progress.

For those of you who don't know I already had an intercooled Vortech V6 with a cam, ported intakes, etc, with bad results maybe resulting from the cam. We could never get it to run correctly.

Pics of Previous Build...


http://3.7mustang.com/forum/showthre...hlight=vortech

I just ordered the turbos yesterday and they should be here by the middle of next week, or the end at latest. They are precision 5557s with the billet compressor wheel. .48 hotside A/R and the Ported S trim compressor housing.

Things I need to do:

1. Weld in bungs for the 02 sensors to be before the turbos, where they are supposed to be.

2. Fuel System- Not sure what I'm doing yet...I may just go with SVT Focus pump and upgraded wiring because it's easy. But I'd need it to be able to support me running 10 psi, not sure if it will. All I'll have is a ported upper, lower, and the head ports matched to the lower for a couple inches.

Questions as of now:

Does anyone know if I should be running any kind of oil restrictors with these turbos? The kit's oil lines are set up so one 1/8" oil line is running from the pump, then splits into two 1/8" oil lines that go to each turbo.

Does anybody have any input about Manual Boost Controllers? Would I need one for each turbo, or can I tee one of them? And any brands in particular, or do the $20 ebay ones do the job? I know sometimes they're fine...

I'll start updating with pics of all the work I do as I go. I'm relocating the fuse box and battery right now.

[JakeM]

IIRC, the billlets have oil restrictors built in. Lemme see if I can find that.


Edit: I can't find anything specific on any forums I trust about the restrictor being built in on the 5557 Billets, but on S197 forum a guy just upgraded to a 6765SE and his is built in for sure. I am fairly certain all the new billet's have a internal restrictor. But Precision's website is a nightmare and I can find much info on the 5557.

Here is the link to the 6765SE build: http://www.s197forum.com/forum/showthread.php?t=43665

[9986paulk]

I just threw in a pic of my exhaust at the end...and I just took the pic of the pass side of the engine bay for a before and after kinda thing.
I didn't get make any more progress today because I slept in and it wwas freezing and I had a few other things to do. Tomorrow I'll get the battery relocate and fuse box thing all done.

[i-bought-a-v6]

yeah it was freezing here too

Originally Posted by 9986paulk Yeah I'm actually pretty sure I don't need any kind of restrictors, expecially since they're journal bearings and I have one 1/8 line that splits into two to feed them. At first I was just curious since these cars run 35-100 psi.

Whaaat??

[9986paulk]

Originally Posted by JakeM IIRC, the billlets have oil restrictors built in. Lemme see if I can find that. Edit: I can't find anything specific on any forums I trust about the restrictor being built in on the 5557 Billets, but on S197 forum a guy just upgraded to a 6765SE and his is built in for sure. I am fairly certain all the new billet's have a internal restrictor. But Precision's website is a nightmare and I can find much info on the 5557. Here is the link to the 6765SE build: New turbo on the way! - WWW.S197FORUM.COM

Yeah I'm actually pretty sure I don't need any kind of restrictors, expecially since they're journal bearings and I have one 1/8 line that splits into two to feed them. At first I was just curious since these cars run 35-100 psi.

[Mach Stang]

man i wish i had enough money to do a turbo lol. I'm jealous. Keep up the good work though, cant wait to see what the car pushes when your done.

[fast90gsx]

Simple eBay mbc will work, you can even take about 5 minutes and ten bucks to make your own. I'm not 100% sure, I've never ran twins but I believe if you have a single mbc set at 10 psi that's only 5 psi to each turbo. Good luck with the build.

[9986paulk]

I think that would actually run 10 psi to each turbo, which would still make a total of 10 psi...does this sound correct, since both turbo coldsides are routed together by the time they get to the manifold?

[JakeM]

No, it would be 10psi combined. The MBC would regulate both turbo's. 10+10 is twenty...

[fast90gsx]

Like I said I'm no expert on twins, I just always believed if you had a total of 10 it would split to 5. Your boost gauge will still read 10 psi.

[9986paulk]

Originally Posted by JakeM No, it would be 10psi combined. The MBC would regulate both turbo's. 10+10 is twenty...

Waittt, I think we're both saying the same thing though...lol

So lets just say I had 10 psi springs in each wastegate, I would have 10 psi total right? Cause both pipes go together.

So that's how it works, 1 MBC tee'd off?

[ESG-642T]

Single or twins or quads...

10psi spring = 10psi on the gauge

[9986paulk]

Originally Posted by i-bought-a-v6 yeah it was freezing here too Whaaat??

Look in a repair manual...or your oil pressure gauge...the lowest mies been at idle was 35 and gighest I've actually watched was around 60..but I dont think I ever watched it at high rpms...lol

Originally Posted by ESG-642T Single or twins or quads... 10psi spring = 10psi on the gauge

That's what I though...but as for MBCs one tee'd is good? I'll get one off ebay tomorrow then.

[fast90gsx]

10 psi in two separate wg would equal 20 correct? That's not combining the ten into both then. Sorry if I'm misinforming you but thats how I would see it after my experience with single turbo builds. Yes a single a mbc tee'd off into both turbo would be fine. What wastegates are you going with? Why not just change springs in those to your desired boost.

[9986paulk]

Originally Posted by fast90gsx 10 psi in two separate wg would equal 20 correct? That's not combining the ten into both then. Sorry if I'm misinforming you but thats how I would see it after my experience with single turbo builds. Yes a single a mbc tee'd off into both turbo would be fine. What wastegates are you going with? Why not just change springs in those to your desired boost.

I was just going to run springs, but I'm not sure what psi I'll be able to run with whatever fuel system I go with. And they are tial wastegates.

But as for the boost, if you have 10 psi on each wastegate, you have a total of 10 psi. Just think of it like this...both of the turbos end up being run together at the intercooler. As soon as you reach a total of 10 psi, both wastegates open. Because the only way for 1 turbo to have 10 psi pressure on its compressor side is for the other side of the system to have the same pressure.

[fast90gsx]

Makes a little more sense now, like I said I've never had 1st hand experience with twins. But good luck with the build. Hope to see more of it in the near future

[ESG-642T]

I wouldn't buy an eBay boost controller... Thats an easy way to buying a new engine.

And no again... Two wastegates two 10 psi springs, your boost gauge will read 10psi.

[JTs03v6]

2 wastegates with 10psi springs = 10psi at the manifold. The wastegates are set to manifold psi, not exhaust pressure.

[9986paulk]

Originally Posted by ESG-642T I wouldn't buy an eBay boost controller... Thats an easy way to buying a new engine. And no again... Two wastegates two 10 psi springs, your boost gauge will read 10psi.

Isn't that what I said?
And which boost controllers would you recommend?

Originally Posted by JTs03v6 2 wastegates with 10psi springs = 10psi at the manifold. The wastegates are set to manifold psi, not exhaust pressure.

Yes, that's how I thought it was all along, but others have tried to say otherwise.

[ESG-642T]

Originally Posted by 9986paulk Isn't that what I said? And which boost controllers would you recommend? Yes, that's how I thought it was all along, but others have tried to say otherwise.

I use:

HKS EVC Turbo Boost Controller|JDM Turbo Boost Controller|HKS Japan Performance Auto Parts