Q45 Rear Mount Turbo Teaser

[qsiguy]

Been holding off posting until I was further along but it's coming together and looks so cool I couldn't resist posting at least one teaser photo. I'm sure I'll get bombarded with request for more photos but I may make you wait. There is still a lot of work to do but it is definitely going in the right direction.

[paranoidjack]

Been holding off posting until I was further along but it's coming together and looks so cool I couldn't resist posting at least one teaser photo. I'm sure I'll get bombarded with request for more photos but I may make you wait. There is still a lot of work to do but it is definitely going in the right direction.

Wow. Looks great!

[DrewQ45]

Looks awesome. I'm trying to figure out how it works back there. Wonder how that's gonna sound! What about emissions?

[bullittandy]

Awesome!!!!!!

Way to go on your ingenuity.

[qsiguy]

Works just like a front mount, just longer compressor plumbing and an oil scavenge pump to push the oil back to the motor. Emissions are unchanged. Exhaust is joined after the cats and a single 2.5" pipe runs to the turbo. 2.5" compressor pipe runs back up to the intake. Air filter, as you can see, is right in front of the turbo in the rear. It will have a filter "sock" on it that sheds water.

[lino]

[CrimsonQ]

Started her yet?

Looks fun!

[qsiguy]

Started it just for a minute but I don't have the oil lines installed or many other things yet. I just manually injected some oil into it for the short fire up. I'm actually driving it almost daily throughout the build. My normal daily driver doesn't have a/c so during the summer I drive the Q most of the time. The turbo comes out pretty easy and I'm just driving with the exhaust terminating at the T4 Flange in the back. Needless to say, it's a little loud right now with only a straight pipe after the cats.

Here's the before pic. I like the new "muffler" much better. LOL

[jamesmost]

u should shield the air filter to protect from H20 suck maybe duct it to a safer location ??James

[qsiguy]

It will have some shielding. It is just mocked up in the photo and is far from complete. Many little things still left to do.

[gammer_ghn]

your set up = sex to me !!! haha Just plant your intake for the turbo inside your trunk by your spare... where you can put a scoop backwards facing the back of your car... but hey you disgned your turbo setup so i guess you know what your doing just trying to give you a little opinion here = ]

[sijoko]

Props to QSIGUY for building the first rear mount turbo sytem for the Q. Maybe, you can post a side profile view.

[Bluejayde]

You should fab up a way to put the old muffler over the turbo, rear mounts are WAY too easy to steal.

And not to start ****, but why did you choose rear mount? No room in the engine bay?

[qsiguy]

You should fab up a way to put the old muffler over the turbo, rear mounts are WAY too easy to steal.

And not to start ****, but why did you choose rear mount? No room in the engine bay?

Hmm, interesting idea to cover it up with the shell of the old muffler. If not them some type of locking mechanism might be a good idea.

Rear mount was decided on first because of space, then I started to like some of the benefits the rear mount offers. Cooler turbo, less need for an intercooler with low boost, relatively easy install (still a big job), cool sound , and to be different. My nephew had a truck with an STS turbo kit on it and it was awesome. STS used his truck for a bunch of magazine articles and it was at SEMA one year at their booth. Fell in love with the concept but didn't want to fork out the cash for their system, tho I may have that much into it by the time I'm done anyway. But I built it myself so I'll have the pride in that

Not sure I have any room to plumb the air filter anywhere else but straight up into the trunk, it's pretty tight to run 3.5" tubing anywhere with the exhaust and compressor tubing in the way. Still considering the trunk option. Have been thinking about building a box in the trunk above the turbo to house the air filter and maybe supply the box with fresh air from somewhere. The idea would probably work well but seems a little cheezy to me so I can't decide. I'll probably leave it where it is for the time being and make changes/upgrades later. Bigger fish to fry at the moment.

Side view...note that the wastegate and oil lines are not installed yet so they may hand down a bit.

[Jeff Williams]

Get rid of that spare tire carrier. That will give you plent of room back there. You could also raise the trunk floor a bit. (and mount a second turbo on the passenger side.)

Who needs a spare tire? - even if you have to have one, just put it in the trunk. It doesn't take that much room. The well is too deep for the spare, and not deep enough for a full size tire.

When you get it done, go ahead and build 4 more to sell to us, to cover the cost of your first one.

[ca18datsun510]

so whats up with this project?

what pump are you using for return?

[burgy240]

Not sure about looks, but what if you used BMW Z3 fenders vents on the back and place the intake in the rear fender ( are the jacks in there on these cars like on 240s?) Then you could use a bypass valve to keep water out and bam your done. Again, I'm not sure how the vents would look, but it would be an easy body mod for any shop....

[qsiguy]

Made some more progress this weekend. The turbo install is on the home stretch. I will still need to complete the plenum job, valve cover gaskets, spark plugs, and a few other items but the turbo should be operational within a week or so. Not much left on the turbo just don't have as much free time as I'd like.

Worked on the oil lines and started the final install of many of the parts. The oil pump I am using is a Shurflo 8000-643-236. It was suggested by several other people that have done rear mount setups. Oil is fed to the turbo through a needle valve so I can regulate flow from the front and won't have full pressure in the long feed line to the rear. After the turbo it goes to the pump then returns to the pass. side valve cover.



Here's a few other photos to get you excited.

[cccpman]

WOW

I really cant wait to see this (oooh yes a video ). I have never seen a rear mount turbo in my life, let alone one on a Q. Your a pioneer - and doing a damn fine job so far

Any chance we could get a total estimated cost when your all finished with the project?

Keep up the good work man

[qsiguy]

Yes, I'll provide a fairly detailed bill of materials when it's done. I will start a new build thread when it's done with complete details and tons of photos.

[ca18datsun510]

hey if you get a chance and are on aim, hit me up

chugger2k

i got some interesting info on the oil system, and would also like to discuss it with you, as im doing a similiar setup on my car.

[Jeff Williams]

Looking good.

Is there any clearance issues with the intake pipe? I have been looking at flat oval pipes in the "Street Rodder" magazine, and thought that would be a good idea if ground clearance becomes an issue.

Are you planning on an intercooler in the front before you pipe it to the MAF?

Keep us posted...

[qsiguy]

I'm not doing an intercooler at first but may add one later. At the low boost I'll be at and from the long distance from the turbo and cooler turbo from being rear mounted the intake temps shouldn't be too bad. I am setting it up for a stage 2 boost controller which will also include methanol injection when I hit a preset boost level to cool the intake temp and richen up the mix.

The only place I have clearance issues is where the compressor tube goes under the motor. The first tube I made will hit if the suspension is fully compressed. I will use it for early testing but the permanent tube will be 3 or 3.5" flattened tube instead of the 2.5" round that's on there now. That section I made easily removable as I planned on it getting hit at some point. There is a section from just under the driver to the front that's a separate piece with silicone couplers attaching it.

Here's a shot of the first attempt. It will work temporarily but will be redone. I can modify this one to give me another inch clearance but with the flattened 3" I can get another inch in addition to that. So the final tube will be 2" higher than the one you see here.



Here is where the front section joins the rear tube.

[dsagers]

hey if you get a chance and are on aim, hit me up

chugger2k

i got some interesting info on the oil system, and would also like to discuss it with you, as im doing a similiar setup on my car.

Post the oil system discussion, I'd like to hear what you have

[qsiguy]

He and I haven't had any conversations yet, apparently we are on different schedules and haven't been online at the same time.

Did you have any specific questions? In a nut shell...I have an oil filter sandwich plate w/ a 1/8" NPT fitting on it. I have teflon stainless hose coming out of that about 12" to a T with a pressure gauge sending unit in it and then to a needle valve. The needle valve allows me to set the flow/pressure that the turbo's feed line is receiving so it doesn't get too much pressure and leak/smoke. There is 1/4" transmission hose running from the needle valve to the turbo in the rear into a 1/4" Conbraco stainless check valve then to another 12" piece of stainless/teflon tubing that goes into the top of the turbo. The check valve requires .5 PSI of forward flow to open and is there to prevent oil in the line from draining into the turbo as the car is parked.

After the turbo 3/8" transmission hose goes through the lower fender with grommets into the trunk where the ShurFlo pump shown previously is mounted. It leaves the trunk and follows the feed line back to the front through a modified glass fuel filter which is there as a sightglass so I can tell if I have return oil from the pump. The fuel filter was from Autozone and I just removed the filter and drilled the holes out larger for better flow. From there it dumps back into the valve cover via a modified oil filler cap. When I pull the valve covers to change the gaskets the fitting will be permanently mounted into the valve cover and the OEM filler cap will be reinstalled.

Electrics are pretty simple, the pump will turn on with the ignition switch and will run whenever the car is on. I also have it on a 1-2 min. timer which activates when the ignition is switched off to pull the remaining oil from the turbo so it doesn't sit with oil in it and leak which will cause it to smoke when the car is later started. It's basically a turbo timer of sorts but instead of keeping the motor on, it just keeps the oil pump on for a couple minutes.

Anything else you want to know? Here are a few photos of the system.

[ca18datsun510]

He and I haven't had any conversations yet, apparently we are on different schedules and haven't been online at the same time.

yeah i work a wierd shift, im online 2am to 6 am usually.

anyway, lookin at this, you seem to have pretty much done the same research i have, and then some. lookin real good.

[qsiguy]

I started it up tonight to set the oil feed flow. The 1/4" needle valve allows plenty of oil to go through. It is capable of opening up at least 7-8 turns or more but it only needed to be opened up 1/4 of a turn to get pretty good oil flow to the turbo. It would be easy to get too much flow. It may be a little different with the scavenge pump running. Tonight I just had the oil draining into a 2 liter bottle to check the flow.

I shot a quick video of the startup and a quick rev for anyone who's interested in seeing an hearing it.

[ca18datsun510]

sounds healthy. i love the whistle.

how much louder is it than stock? do you plan on adding any kind of muffler or resonator?

[qsiguy]

It is significantly louder than stock right now. The main rear muffler is obviously gone to make room for the turbo and the two resonators are gone. Still have the 2 pre cats, two cats, and the turbo. The turbo muffles it a little but I have a feeling I'll be adding a muffler in the future. It all depends on the amount of resonation/drone. Ive been driving it with the mufflers and resonators off for a while and it was really getting old.

[qsiguy]

Well I managed to get it on the road tonight! Did a little testing, nothing too crazy. The wastegate spring is set for 3.6 PSI and I'm seeing a little over 3 PSI on the gauge. The BOV sounds awesome, not too loud but definitely noticeable if I'm at full boost and close the throttle. It does the pulsing sound if you know what I'm talking about. I'm sure it will be much louder as I turn up the boost. It was going into boost at around 2.5k RPM and was at full boost around 3k RPM. It felt pretty good and seemed to pull harder the more times we tried it. Man I sure love the turbo spool sound! The turbo muffled the sound quite a bit as well so I may not need to add a muffler. It still sounds really nice but the turbo took the edge off I think, I'll have to drive it for a while to know for sure.

That oil return sight glass turned out to be really awesome. I can easily see that the oil is circulating and after I shut off the motor I keep the pump running for a bit and can tell when the oil is purged from the turbo and lines. I highly recommend this <$10 option to anyone running a scavenge oil pump.

I will get a few videos made in the next day or two and get them posted. I'll get a variety of shots, drive by's, etc. I don't think an in-car video would be very exciting but let me know if you want to see something specific.