Rear Turbo Setup
 

Hi Everyone, First post here on MiataTurbo and would like to say hi. Hope you enjoy the post and pics.

So here's the Parts list:
Comp Turbo, Water Cooled Ceramic Bearings, no oil.

MSPNP Pro Here's a huge suggestion, make sure you lengthen the wires that are given to you by DIY Autotune so you can have easier hookup from the extra terminals in the back. Do the same with the vacuum line, put about 18" on it and run a barbed coupler to connect the one going through the firewall to the engine. If your afraid of it blowing off with boost super glue it. Don't put the super glue in the vacuum tube just on the barbed ends and slide them on, they won't come off.

Tial waste gate
Turbosmart BOV.
Custom charge pipe by me, I have a bender.
Custom exhaust, I have mig and tig.
GM IAT sender.
MS electronic boost controller
Extra GM 3 bar map sensor for exhaust back pressure reading. Have not taken any readings yet.
LM1 wideband setup.
2" tubing
Lots of good turbo hose clamps

I don't hate you for your car or turbo placement decision, I hate you for dropping that kilo brick of words on me while expecting me to keep track. All I get is rear turbo from the first, and don't hate from the end.

dafuq. Learn2paragraph.

Is that better?

Does it spool like donkey dick?

Awesome fab

It comes in about 3000 RPMs and is getting better daily. The Comp ceramic water cooled turbos are like that, they need some break in.

Positive pressure? Or high boost.

What size turbo? Built engine?

Stock engine, 5 psi now until I get very familiar with tuning. Then injectors and 8 to 10 Psi.
Just finished it the other day so I'm taking it slow and easy.

No I mean is 3000rpm when you get positive pressure or 5psi?

Positive pressure

Hmm. Interested in spool logs.

Me too.

:bowrofl:

Clever setup and nice clean fab. It'd definitely confuse folks when you pop the hood, but really, why? Is it just to be different?

Why do you have the MAF still installed.

This is awesome and I just can't fault you for doing something different and unique. My only wonder is how the spool and pressure drop is going to be considering how far the air has to go. Especially since the charge air is travelling a couple inches away from the hot exhaust. Still a badass setup imo

great location to install eletrical components. smh...


where's the oil pump?

I live in California and wanted a quick easy removal-able setup. I can put it back stock in a couple hours for smog or just for doing weekend racing. Throw it on Friday and go racing. It's quick and easy.

You could do the same with a regular setup.

I had my turbo, manifold, DP, and IC removed within 20 minutes when I took mine off...

The MAF is not installed or does the top stock intake hose do anything except hide the pressure tube coming up to the throttle body. It just looks stock. Again California stealth mode.

what happens when a cop notices how loud and riduclous your car sounds and looks to see if youve added an aftermarket exhaust?

I like it. Something different.

I wonder what the volume of your cold side plumbing is. With all that cold underbody airflow there might not be need for an intercooler even at higher boost levels.

In for spool data and IATs.

Comp Turbos, water cooled ceramic bearings, no oil. I live in California and it's my fun car. The electrical components are really no concern, there sealed and just fine. If I live where it rained I would have done things differently.

intersting.

i still dont like the idea of running wires and electircal components to a remote location instead of just vacuum line. like the map sensor... you shoudl be taking the reading off the intake mainfold, no idea why'd youd put it as far away form that as possible.

Dear Braineack, I was hesitant to even post my car on this site because of all the grief and hassle I've seen you give other people because they don't conform to your standards or opinions. I built the first FRS rear turbo car on the planet a few years ago and got a lot of grief then. I know what I have and you can't change that, if you have nothing nice to say why say anything? Some people are interested in the setup and your not so move on or just follow along.

The IAT @ 5 PSI was about 125 degrees. I will probably go 8 psi and we'll see what happens. It may need a cooler.

It's not the MAP for the intake, It's the MAP for the exhaust pressure.

wow, are you going to cry? Is that not a legitimate question? You said you did it for smog and to trick people, but will it trick a cop when he inspects your muffler? does that not happen in CA -- i cant imagine that car being quite...

and I dont just say nice things (that's what your mommy and liberal art tecahers are for) and people shouldn't expect others to hand out compliments. grow some fucking balls pussy. do you need to find a safe zone? :)

I'm not even giving you grief, just some shit.

ah gotcha. What's the purpose of that?

Dude, he's just giving you some honest feedback and asking questions that are worth thinking about.
He's not being particularly hard on you... yet.

I have learned that this forum is the most "trial by fire" place on the internet. You will get torn up at first, but for those that make it past the grief, it is an amazing place to be at with great insight and knowledge.

What was ambient? Temp over ambient is more relevant.

How does the longevity of an water only turbo compare to a oil and water turbo? any plans to switch to an oiled setup down the road?

You can use the exhaust back pressure to see how efficient your turbo is working. From what I understand the back pressure should be under your boost pressure or close to it. Don't quote me as I was told that and have not done due diligence yet.

Ambient was about 80 degrees. The turbo should go about 100,000 miles. At oil changes you shoot a couple pumps of special grease into the zert by the center cartridge.

I really don't want the oil pump nightmare, the water cooling is pretty clean setup.

Man, don't be so sensitive. Awesome build, loved the STS remote mount stuff for the C5. I thought that was always an awesome way to keep temps manageable and with modern turbos you can still get decent spool characteristics out of remote mount stuff. You should post some of your logs and let people pick them apart. Don't let your ego be hurt by it, it's just the internet. Lots of great information in all the skepticism here.

I like this because it's different. But like others, I question whether this has any benefits compared to a normal mounting location.

Also, as you already stated that you were aware of, sometimes people offer some "tough love" here. If you knew you were going to get it, then buck up and take it. At least you're not JDM corvette guy.

I'd been trying to remember the name of the manufacturer that made the oil-less turbos. I've heard about them once or twice, but no first-hand experience.

The relatively high boost threshold, I suppose, is to be expected given the bearing configuration. I'll be extremely curious to follow the progress of this car and see how it holds up over time.

Welcome aboard. Looks very nice under the hood. I have a special fondness for sleepers.

Thank you about the build. I know that everyone takes their lickings here in the beginning and Brain is a sharp guy. When I did the FRS build STS actually called me and wanted to know about the Comp turbo setup so they could eliminate the oil pump setup, although that's what their Patent revolves around. As soon as I get a handle on learning tuning better I'll post some logs.

Comp Turbo in California.

im really quite dull.

You guys are on fire today.

There are a few guys running rear turbos on festivas. Most of them are just using an inline electric fuel pump designed for carburetors (8psi) on the oil return. The current 1/4 miles record holder is running that setup on a bp swap.

:giggle:

bro, i dont read.

Never would have guessed.

Looks like some really nice clean fab work. Interested to see how it performs.

125 ait with 80 amb I'd say yes, you need a cooler

It's pretty cool, I've actually considered something like this for NaziFornia, but too lazy to go through all the trouble for mediocre power

Atleast provide us with an exhaust video... I wanna hear how this thing sounds!

It's a water cooled muffler officer.

meh, unless your car looks all stancetarded and blatantly modified, I don't see him getting a hood pop or underbelly check from a cop.

He's clearly put some effort into this too, so I'm sure he has the brain power to keep the car looking stock on the outside too

This would be cool to run with E85 to eliminate the need for an intercooler. I feel like the whole idea of this kit is simplicity, which leaving the intercooler out would satisfy.

I'm curious about it's mounting. Is it hung from the exhaust hangers? I can see some rod going to an exhaust hanger on the right side of the pictures, but can't tell how it's actually mounted.

e85 doesn't eliminate the need for a cooler.
neither does w/I.

I did mount it through the exhaust hangers but used 2" turbo clamps around them to stiffen them up a bit and safety factor. I tapped a 1/2" rod on both ends and use 7/16" fine thread bolts and fender washers to cap the ends so the rod does not move. Worked out very well, same way as the FRS I did.

Does this mean he will need to eventually replace the muffler bearings?

The car looks totally stock except Mazdaspeed wheels that a friend donated. It still has a CAT since in Cal it's about a $2500 fine for removal. It has a 2.5" setup with California legal Cat so that's all good.

Roadstercycle, are you by any chance related to the roadstercycle reverser box for motorcycles?

If so, preparef or a bombardment of questions

What size turbo

Cool man.
That turbo needs a muffler shaped heat shield.

Yes I am. Although don't take over thread with this. Just PM me.

Something you will learn soon is that threads get out of control here very quickly, and get taken over.

Turbo, CTX Billet 5356 oiless, 36 AR