Rear Mount Turbo is very effective.

[Vilmenay]

Hello new to the forum. I have a 1990 300zx N/A and have been able to modify my car in order to have a rear mounted turbo installed underneath where the spare tire wheel well used to be. I've used a T3 RB20 turbo at 5psi with an internal waste gate and BOV. I have less then $800 into it and every part is new including the turbo purchased off of ebay for $239, oil pump for $99, y pipe for $20, T3 flange adapter for $30, 8 feet of 2 inch exhaust tubing $45 Bov used ebay $25 and $140 paid to the exhaust to be welded and bent properly. $50 worth of brake lines, adapters, clamps, vacume lines and fittings. $10 for radiator hose, and $35 boost gauge. $100 for high volume fuel pump. Bascically I removed the two mufflers from the cat placed 2 s bend pipe in their places that led into a y pipe. The single outlet side has a t3 flange welded at a 45 degree angle to which I bolted the turbo. The pressurised side is fed to the front of the car using 2 inch exhaust tubing with to l bends that eventually get tied into the air mass sensore. the exhaust side as a 3 in l exhaust pipe that acts as the exhaust tip. No need for muffler because the turbo quiets it down. I'm currently running 5-6 psi and it makes a huge difference. Sounds like a jet plane when launching and hard accelerating. Under normal driving it kicks in around 3200 rpm . believe it can be done. I'll forward pictures if you want to see. My question is though with 10:1 compression how much can I safely push the boost up to?

[evildky]

old school rear mount style on a Z32! heh, how about that, my problem is that you loose boost over the length of piping, when I rerouted my I/C piping and changed I/C's I felt a noticable difference, it really reduced lag, but on a 10:1 motor I supposed lag isn't ap problem, I'd say 6-7 psi would be max! I would recomend a wideband O2 sensor to monitor it, you might be able to get away with more boost with a good stand alone managmane system, you might want to upsize those injectors and see about a remapped ecu to get the most out of what you have, be sure to post up some pic's I know they brought this back for a package on the vette as well, be neat to see it on a Z32

[Logan76]

Correct me if im wrong but arent turbo set-up's like this popular with corvette owners?

[mtcookson]

Nice, I've been waiting for someone to do this. I was thinking about doing it to my car just to see what I could make it do before I swap the VH45 in but things came around a lot quicker and I'm ready for the swap.

I'd definitely like to see pictures myself, my email is mark at machzracing dot com. Any dyno numbers or track times?

Power wise, as long as you keep your fuel supply there to keep it from detonating you can pull some decent power. There are many Maxima guys running pretty high boost on stock internals with high compression like that. One guy got as high as 500+ whp in his Maxima with a VQ. It likely won't be too reliable that high but it can be done.

my problem is that you loose boost over the length of piping

You don't really lose any more boost than you would with an aftercooler setup. If you do add one to the rear mount setup then you will likely have a little more pressure loss than the standard setup, but its not going to be an incredible difference.

[evildky]

yes there si now akit for the vettes, everything old is new again I guess? and that turbo is way small for you're application, you really need 2 of them or a T3O4E, and as for pressure loss, and efficient I/C has very little pressure loss, less than 8 foot of straight pipe, and the I/C has more cooling effect as well but thats neither here nor there, more than anything I admire that he did a custom turbo conversion using cheap/used parts and made power in a Z32 in a way noone else is

[Vilmenay]

Forward your email and I will send pics, I can't figure out how to post them.

[mtcookson]

Here you go:

















I see some minor areas that could probably increase efficiency slightly but overall, I bet that thing is quite a bit more fun.

[gpelite]

how about pics that work mtcookson? lol

I REALLY want to see it, I am about to redo my setup. Do you have a sound bite at all?

do you have large lag from the location?

Forward ur pics to my email in my signature below...
Modified by gpelite at 7:12 PM 1/26/2007

[NSR_s30]

Correct me if im wrong but arent turbo set-up's like this popular with corvette owners?

Saw one at a carshow over the summer.

[gpelite]

very very cool stuff, I got a lot of new ideas from that.

How do you deal with oil pressure and coolant pressure in the long line, what kinda set up do you have?

I am so thinking about throwing a turbo on my beater SHO to test all this madness out.... for kicks

haha I love this idea, way cool

[evildky]

love it, I don't run a muffler on my L28ET either, I did wrap my exhaust pipe with header wrap and addes a downturn that helped quite a bit still rather loud, and that turbo is way too small, but I guess it's safer than a larger one

[gpelite]

small, but I garauntee you that turbo just "boosted" the resale value in the private market

Also what did you do your welding with?

[nosduj]

I would like to see some dyno numbers to see what is possible with this type of setup. You really could do a twin turbo setup, one on each pipe like this. That is the way the vette setup is.

[Vilmenay]

I tapped off the oil sending unit off of the engine block with a T brought it to the rear with 3/8 brakelines, it has a reduced fitting to control oil pressure into the turbo , I then have a rear mounted 12volt 60 gal/min oil pump that returns the oil to the front of the car and dumps it into the oil filler cap that has a pcv valve spicket embedded into it. The pump is wired to go on as soon as the car is started. On my particular turbo it's oil cooled and being that it's far from the engine that helps, also with passing drafts as the car runs heat does get dissipated. Over the summer I'll probably add an in line oil cooler before the oil reaches the turbo. Didn't do a twin set up because of the high compression of the N/A engine, so I tried to find the largest 4cylinder turbo that was pretty decent in price. it has .60 A/F and is rated to push 35psi, I believe it because at 5lbs I'm getting bosst creep as high as 10 when hard accelarating despite having a BOV and the stock internal wastegate set to 5-6psi. I used JB weld on the turbo side for the air intake as for the exhaust the shop took care of the welding for me.

[andymac40330]

You have actually pulled this off for less than $800?

[Vilmenay]

well I actually could have done it for less if I knew how to weld. I have to say ebay helped me acheive this reasonable price as well a doing alot of the wrenching and mock up. The most expensive part was the turbo for 239, 140 for the welding, the oil pump for 100, the fuel pump for 100, the rest were stock items you can get online, autozone, advance auto, napa, and even lowes. Just find the best deals

[andymac40330]

i believe i could get the parts pretty cheap and i know a guy who does welding REALLY cheap, how much do you think the other labor would run? (i know nothing about turbo's) lol Also did you just run one turbo?

[Vilmenay]

Well I was able to get someone to weld everything for me for less then $200 with parts that they supplied. If you know someone I'd say you should get it for significantly less. Just source the Y pipe off ebay I got the 2/1/2 by 2 y pipe. the rest was easy to source. Mind you You'll also have to cut out the rear tire well of the car and cover it with sheet metal. I purchased a 3 X 5 foot section at lowes and just used sheet metal screws and hung the turbo from that using braces.

[Shahee1]

Mice Job I hope to talk my GF into letting me complete this conversion on her 2+2 ... I have been thinking about this for a while.

[LUCKYZ]

There's a manufacturer that makes them for specific vehicle (ie vettes/trucks etc). The system is call Squires Turbo Systems or STS. The benefit of the system is in the reduction of heat in the engine bay. It prolongs the life of the turbos and other associated parts. Supposedly you gain about 5 horsepower for every 1 degree the temperature is lowered. There was a build up on a C-6 Vette on the Horsepower show(Spike Channel) over the weekend.

[zboost300]

Ugh, what a bunch of idiots in this thread.

btw, that $200 made in china turbo won't last too long.... lol

[mtcookson]

Idiots? For what? The turbo setup? Calling the turbo setup cool?

Its not too smart for a new guy to come in and start calling people idiots, you know?

[Vilmenay]

The funny thing about your comment is that history shows how turbos were actually introduced first in air planes so when automakers were installing them on cars pilots were making crude remarks such as yours...I think what bugs you the most is that you spent basically up wards of maybe 5 to 8 grand on a car that I basically have for a 1/3 of that price..don't confuse ingenuity with ghettoizes...and by the way I didn't care much or appreciated the racial comment.

[nsrZ32]

Racial comment?

Did I miss something reading over this thread?

[Vilmenay]

Zboost300 emailed me directly his opinion regarding my rear mount turbo which is somewhat edited from what is posted.

The following reply was posted by zboost300:

Ugh, what a bunch of idiots in this thread.

That is by far the most worthless pathetic ghetto attempt for turboing an na....LMAO.

[Gino]

haha **** it man, very innovative and quite frankly, ingenious on a Z. I know its been talked about before, but never carried through (atleast not publically). ****, this made it to 300zxclub.com lol nice work man

[Florida240sx]

What pump would one need to get? looking to do a a setup on vh45de rear mount...

[AsanBBoy]

Other than the pump what other things are you using for fuel? Bigger injectors? fpr? fmu? safc?

[tylerw1]

Vilmenay check your email. My email is [email protected]

[Vilmenay]

Just used a larger fuel pump, waste gate as well as a BOV all set to about 5-6lbs. The knock sensor thus far has kept everything together. Won't really know for sure until the summer where heat temps will be higher. In the future, will probably go for larger injectors maybe 400-550