1994 Infiniti Q45 Rear Mount Turbo full writeup w/pics

[qsiguy]

I started messing with the Windows movie maker and put together a decent project video with build photos and a few driving videos.

Enjoy...http://videos.streetfire.net/v...3.htm

[quicksilver03]

I started messing with the Windows movie maker and put together a decent project video with build photos and a few driving videos.

Enjoy...http://videos.streetfire.net/v...3.htm

love it

more boost please!!!

[MR. Q]

Sounds Vicious

[Carl H]

strange that the ecu would stream diffrent info from one country to another.

[elwesso]

whats the update on the car?

[BallzDeep1.9L]

question.. i have a friend who will soon be running a rear mount turbo setup on his LS1 camaro, have you checked the air filter lately.. the main thing i oculd see happening is that thing getting clogged with crap being that close to the ground?, just a thought..

[qsiguy]

Update is that the car is sitting in the garage waiting for me to make a new intake tube. Silicone couplers should be here next Wed. and I will be making one from 3.5" stainless tubing. This is the tube that goes from the MAF to the throttle body. The OEM rubber one now has a 3" crack in it, couldn't handle the boost. Other than that it's running great on low boost.

To up the boost I still need to do the plenum job, replace the knock sensors, replace fuel filter, spark plugs, etc. Also installing methanol injection and then for some ECU tuning. I need to make a new compressor tube from just under the driver up to the MAF tube. The one I'm using is the first prototype and hangs too low and hits often. The new one will be from oval tube and should give me another 2-2.5" of clearance.

The air filter is fine, the car never rarely see's a dirt road and it rarely rains around here so the roads are pretty clean. I cleaned it once and it didn't look much dirtier than it did when it was up front.

My only real problem with the car is that I haven't had enough time since I got it on the road to finish up the details and up the boost. Been following orders to get my backyard landscaping done from the boss (wife) and it's almost done...then back to the important jobs!

[TBrack]

As much as I would love the sound of a turbo I still would rather try that supercharger project...

[elwesso]

Shane have you considered going up by the steering column, or do you not have enough room to do that?

[qsiguy]

Well, since Siju did that I know it can be done but he said he didn't recommend it as it was a pain. It would be difficult to get a large enough pipe through there for the compressor. I think Siju's was only a 2" pipe but I'm not sure. The route I'm using I think will be fine, I just need to do it better. The first try I left quite a bit of slack in it.

[tkd_q45]

It is awesome and I am jealous!!!!! Your car sounds great!!!!!

Do you get any better MPG?

Aren't you concerned w/your intake location? How will it perform in the rain? Would look like you'd have to clean/replace often.

[elwesso]

how would burning more fuel and air give you better MPG?

[qsiguy]

Many people get better mileage after installing a turbo if they can keep off the gas! Especially some bigger vehicles like Hummers. I don't know yet since I can't keep my foot off the gas. When I get tired of going fast I'll get some good MPG figures...may be a while

Not worried about rain, stay out of deep puddles, mostly don't submerge it! If you were really worried you could do a nice shield to keep water from tire hitting it directly. Seen several 4x4 trucks with rear mounts blasting through water. The water vapor being pulled through the filter wouldn't be a problem, just don't want liquid water being pulled through if submerged. If the filter gets a little damp that's just free water injection! JK Will require more frequent filter cleaning but not much more often. It's not like I'm romping through the desert in my Q.

New couplers should be here tomorrow and I can get my new intake tube installed and be back in business!

[qsiguy]

Made some progress on my new intake tube. Here's a photo of what I've done so far. It's coming together good. I have a 1" elbow I welded up today that needs to be welded on the bottom of the new tube for the PCV tube on the bottom. It's not on in this photo. I plan to fit it up and weld it in the next day or two.

Then it's on the the other 100 or so items on the list...........

[qsiguy]

Oh, and here's what I ended up doing about the crankcase vent. I capped off the top crankcase breather port in the intake tube and connected a 3/8" hose and routed it over to a "catch can" I made. This line is pretty much always under a vacuum except for any blowby I may get at full throttle/boost so I doubt I'll ever get anything in the catch can. No more oil fountains from the dip stick tube!

[hpfreak1]

Very nice custom set up and it sounds good. I have a couple of questions for you with respect to tuning.First do you run or plan to run colder plugs?Have you gapped down or planning to gap down the plugs when you raise the boost?Once you have the ecu tuning sorted is this something you are going to make available to the public? Boosting the Q is something that I have wanted to do since purchasing it 8yrs ago but have shyed away from doing so. I am no stranger to boosting NA motors as I built a custom turbo for my VR6 Jetta(500hp) and it has been running strong for almost 3 yrs. This just may inspire me to boost my Q. The rear mount looks like a solution to the cramped engine bay although a bottom mount may work also.Good job and have fun turning up the boost!

[hpfreak1]

I saw where you posted on another site about using one step down colder plugs. Curious to see if anyone has used copper plugs as opposed to the iridium. Copper plugs work well with boost and are quite a bit cheaper at just over a buck a plug. The only thing is copper plugs don't last as long as the iridium or platinum.

[qsiguy]

Thanks for the compliments. Yes, I have some Iridium plugs that are 1 step cooler but I have not installed them yet.

I've thought about reproducing some of the pieces of the system to help others do it to but I haven't made any final decisions yet. I doubt I'd put together a whole kit but a few key components could be made to speed up the process. I guess it depends on the interest. Many people say they want boost their vehicles but there are few who pony up the cash and do what they say....

[hpfreak1]

I think all it would take is a ride in a turboed car and they would never want to stay NA. The Q is the only car I've owned that wasn't Forced Inducted although I would have to say that the vh is an adequately strong motor in NA form, it would just be that much better with a turbo. Actually for myself I would just be interested in the tuned ecu as this is one aspect I don't have alot of experience in.

I didn't notice if you have a built transmission or upgraded torque conv but what power level do you think a stock trany could handle and the stock diff for that matter.

[ScottJackson]

Looks good. The only thing I'd try to change, if it's at all possible, is make a longer length of straight pipe before the MAF. As it is, there will be more air going on the outside of the bend (the top) than the other side. You may need to clock the MAF to get it to run as you want. And even that may not do the job.

[qsiguy]

No built transmission or torque converter yet. Still on the long list of goodies I want to add.

As far as the MAF, all the symptoms everyone said I may have with the bend before the MAF are non existent. What issues do you believe I'll have with the bend there? So far it runs really well at all RPM ranges. I've ran it up to 5 PSI and haven't noticed anything that would lead me to believe it is an issue.

[qsiguy]

Got the replacement intake parts done. I polished them and sprayed clear lacquer on them. Nice to be back on the road. I have a tank of 100 octane race fuel in the car right now and have the boost at about 5-6 PSI and wow does it make a difference! The difference between 3.5 and 6 psi is huge. You can really feel it lauch when I hit about 3k rpm at full boost. I have a feeling that old intake tube was leaking for a while and just finally got worse. The boost seems to rise quicker when it hits.

Pulled out of the McD's parking lot last night and spun the tires for about 50 yards......

[maxnix]

Very well finished installation!

[elwesso]

NEED VIDEO!

[qsiguy]

I have to get some car to car videos but until then here are some in car videos we got today. It's so hard to accurately capture the rush of acceleration. Most of the WOT starts in these videos the rear end's breaking loose. A couple of them you can tell when it fishtails a bit.

If you check right after this post you may have to wait 10 minutes or so for Streetfire to prepare the video.

Infiniti Q45 remote mounted Master Power T70 Turbo. Increased boost to 6 PSI. Assorted in car videos. Guess I need stickier tires...

[xerexabante]

Sounds very good. Good Job, now get those G35's a run for their money.

[ddrumman]

I love how at around the 45 second mark the rpms just zoom past 7000, and again at 2:14....

How different is the torque now vs. pre turbo?

[badboy2536]

Hi, I'm Larry in Denton TX and I have am building & restoring Q45A's. I love what you have done with the turbo charger on your Q45. I would love to speak with you. Possibly we could workout something that would be very financial rewarding to both of us. I own a large auto repair shop & transmission shop in Denton TX. Please call me at 940-465-4439 or email me at [email protected]

I really look forward to hearing from you. Also does anyone know where to purchase the President Body Kit for the 91 thru 96 Q45? I am looking to purchase good Infiniti Q45A's at a reasonable price anywhere in the country. I will also consider some Q45's for parts cars. I am trying to build 2 Q45A's per month.

Larry 940-465-4439. Call anytime
Modified by badboy2536 at 8:31 AM 12/23/2007

[badboy2536]

From Larry in Denton TX. I would like to do what you have done with the turbo, but I would like to also add dual exhaust. Do you have any suggestions or foresee any problems with that. Would I need to add dual turbos?

Larry 940-465-4439 or [email protected]
Modified by badboy2536 at 8:28 AM 12/23/2007

[qsiguy]

Torque seems about the same off the line as when it was NA as nothing else has been changed other than the longer intake tube and that would mostly effect higher RPM performance and of course at higher RPM the turbo is taking care of that issue

Larry, I'll give you a call probably after the holiday to see what you have in mind.

Dual exhaust would be tougher for the active model as there are some components on the passenger side that would be in the way. More space on the standard model but you'd still have to make small modifications. One thing I've see guys do on rear mounted turbo GTO's is use the passenger side exhaust tube for the wastegate exhaust. You can mount the wastegate further forward than I did on the exhaust and route it out the passenger side. It's this way on the single turbo Porsche 930 my friend has. The driver side exhaust is just for the wastegate and the passenger side is the turbine outlet.