z31 Okay?

Post by **mulletmrt** » Fri Jan 24, 2003 9:23 am

Hey Guys I am planing to do a custom turbo setup in a bit and was wondering on which turbo to use? I can easily get my hands on a z31 or a z32 tubo form the300zx. Would this be okay to boost a KA24e s13? I only plan on boosting 9-10psi max because I'm a wuss. I'm preping my spare engine as we speak.(well not really I wouldn't be able to tpe this if I was). Anywho let me know if this is "do able" Thanks Mike

Post by **APEXi240** » Fri Jan 24, 2003 9:23 am

I know a Z31 turbo will boost to 10psi with no problem (and with no intercooler either heh). I'm sure a Z32 would work fine at 10psi also.

Post by **ziggy682** » Fri Jan 24, 2003 9:23 am

The z31 is a good turbo for up to 10 psi, after that, our 2.4's will start to choke and they will flow less effieciently. A z32 turbo is way too small. Think about it. A z32 is a 3.0 liter engine with one turbo for each bank of 3 cylinders. Meaning the turbo is sized for a 1.5 liter engine. The T25 from a z32 is just too small.

Stick with the z31, that's what I'm about to use.

Post by **1LoSX** » Fri Jan 24, 2003 9:23 am

well you need to worry about your manifold first - unless you can get a custom for any size you want - also the ka24e fuel cannot handle anything like 10 psi . Get a bigger turbo becuase youll soon want more boost and a z31 will not offer that much more than 10psi - hope the insight helped

Post by **TrunkMonkey** » Fri Jan 24, 2003 9:23 am

the Z31 T3 maxs out around 15-16psi.

-demetrius

Post by **mulletmrt** » Fri Jan 24, 2003 9:23 am

Okay also I've been told that the z31 cotains an internal wastegate. Is this wastegate reliable? Would I beable to boost to 10psi or would this hinder this? Would I need to buy a boost controler? Thanks Mike

Post by **bruinbear714** » Fri Jan 24, 2003 9:23 am

Funny, I was at the junkyard yesterday pulling out a z31 turbo with my friend. It is internally wastegated, and looks to be a T3 sized turbo. Make sure you get the exhaust elbow that is attached to the turbo though. My friend didn't want to fork out $25 for it and now we might end up going back there to purchase it.

Post by **Projex240** » Fri Jan 24, 2003 9:23 am

The Z31 turbos wont choke due to the 2.4l displacement of the motor, theyll die off in power due to the turbine wheels efficiency range. You can have them built to produce around 260 to the wheels with proper mods @10 psi. I've seen even more power than that, just not too many times...plus you can retain your stock bottom end for a budjet build up. I know we are all used to hearing about 400hp and 450 to the wheels...just like to let all of you know that are planning and dont actually have a turbo ka...450 to the wheels is hard and expensive to get and keep reliable. Plus...260 is not slow at all in our cars. 260 at the wheels in a ka absolutely RAPES SS and ta v8's all day long.

Post by **Red Lightning** » Fri Jan 24, 2003 9:23 am

What years Z31 have T3? I read some Z31 have T3 but later ones only have a T25?

Post by **mulletmrt** » Fri Jan 24, 2003 9:23 am

I think the good year z31s are 86-89 (I could be really wrong on this answer though). Also the t25 would be on the z32 300zx the twin turbo years. To have a single T25 on a 3.0liter engine would seem odd to me.

Post by **Exar-Kun** » Fri Jan 24, 2003 9:23 am

you'r wrong. Thea earlier Z31's had the T3 setup, whereas the later models(87-89) had a T28. Check out http://www.Z31.com

I used to own a 1985 300ZX. IF you are going to use a Z31 turbo, get one from the late 85 or 86 turbos, they were water-cooled in addition(the early 85 and 84 turbos were not) to being the T3.-chet

Post by **Dattebayo** » Fri Jan 24, 2003 9:23 am

Hey Exar-kun so what you are saying, the 88 turbo i have is really a t28?!?! holy sh*t man! So how well is a t28 turbine with a t3 compressor on the other end gonna out perform a t3?

Post by **Exar-Kun** » Fri Jan 24, 2003 9:23 am

if its got a T3 compressor and a T28 turbine, it should spool faster than a stock T3, the exact reason nissan put the T28 on the later Z31 chassis....get 5 more hp and a borader power band, but its not as high-boost friendly.

the small turbine section of the T28 will reach an inefficiency point faster than the standard T3 under higher boost applications.-chet

Post by **WDRacing** » Fri Jan 24, 2003 9:23 am

Yeah, you might run into exhaust restrictions using a T28. But I'd try it anyway, how much boost are you going to run??

WD

Post by **Und3rprshUr** » Fri Jan 24, 2003 9:23 am

They put a t25 not t28 on there and raised the compression thats why it spools so quick 84-86 had 7-8-1 (t-3 turbo) compression 87-89 had 8-5-1 (t-25) t-25 all the way not t-25 with t3 compressor. t-25 of 87-89 z31 = deh suxorz the t-3 is an old garret unit with a stage 1 wheel maeing it sucks as well when compared to todays turbo's. i boost my at 12 lbs anything over that with the t-3 wont be efficeint enough. t-25 max at 10

I am deh Z specialist

~

Post by **Exar-Kun** » Fri Jan 24, 2003 9:23 am

I stand corrected then. I coulda swore it was a T28...-chet

Post by **Und3rprshUr** » Fri Jan 24, 2003 9:23 am

T-28 = Z32.

Post by **Projex240** » Fri Jan 24, 2003 9:23 am

NO- the stock turbos are t-25's...the t-28's are an upgrade for the z32-im not sure they are worth the money though.

Post by **Dattebayo** » Fri Jan 24, 2003 9:23 am

Now im all confused. I check out z-31 and the fische only goes to early '86, so no info there. Im just gonna call nissan for the answer then and post the truth.

Post by **Und3rprshUr** » Fri Jan 24, 2003 9:23 am

2BN_s13 its simple trust me

t-3 on 84-85 air cooled

t-3 on 86-early 87 watercooled

t-25 late 87-89 watercooled

thats it... if the pipe coming out Turbo to the throttle body is bolted to the outlet of the turbo you have a t-25.

Post by **Dattebayo** » Fri Jan 24, 2003 9:23 am

okay cool... but im quoting what i found on my mechanic's online help manual about upgrading

"...To upgrade to a t3 frame turbo from the t2 frame used on 88-89 models you will need..."

blah blah it goes on. But i guess t25 counts as a t2 frame. Your right thanx

Post by **Und3rprshUr** » Fri Jan 24, 2003 9:23 am

T-3 will bolt up fine in a t-25 car done it 3 times..

Post by **revlis240** » Fri Jan 24, 2003 9:23 am

Und3rprshUr wrote:2BN_s13 its simple trust me

t-3 on 84-85 air cooled

t-3 on 86-early 87 watercooled

t-25 late 87-89 watercooled

thats it... if the pipe coming out Turbo to the throttle body is bolted to the outlet of the turbo you have a t-25.

Hey all,this is my first post here, i guess im bored with FA. anyways, just wanted to correct you a little bit. ill post my setup later, but its 3am and i just wanted to get this in :-).

These are the correct specs on the Z31 turbos

1984 - Oil cooled T31985-1987 - Water/oil cooled T3 (i have a 1985 T3)1988-1989 - WAter/oil cooled T25 ("0-30mph performer")

All of the T3's had a .63 A/R turbine, but a rather small compressor, which is where most of the problems occur.

More info later, nice to meet you guys,-Abe

Post by **Und3rprshUr** » Fri Jan 24, 2003 9:23 am

Your not correcting anyone BTW...

They are not oil cooled they are air cooled

they are oil lubricated. air coooled hence the scoop on hood above turbo.

in 86+ the scoop is gone becuase they were now watercooled not air cooled

If you think the oil is there cool your wrong. turbo's have bearings and need to be lubricated..

Yes they have a .63 housing and on old 1950's stage 1 exhuast wheel that limits the performance but makes it a Very nice streetable turbo.

Before i upgraded turbo and fuel on my Z I put out 255hp and 345 torque to the wheels on my stock nissan t-3 with stock fuel injectors So i would say its decent enough for anything under 3.0 liters.

1986 300zx VG30ET

Post by **LT_Z** » Fri Jan 24, 2003 9:23 am

my 85t z31 has a t3 and its oil lubed and watercooled and i have a scoop

T25 sux it will only boost about10psi. I have run the stock z31 T3 up to 18psi on race gas, gets a little hot but no probs on single 1/4 mile passes. Go with the 84 cuz its oil only (simpler) plus the z31 t3 can be built to hybrid t3/t04e for like $600 so its a nice buy. not sure how it will spool on a KA24 spooled descent on Vg30et. anyway hope that helps

Post by **Projex240** » Fri Jan 24, 2003 9:23 am

aircooled-what a waste of engineering. The scoop is the there moreso fro intake temp purposes. The ARE oil-cooled-hence the oil lines. AND NO-the oil lines arent there JUST for lubrication-they are a source for cooling. Thats why if the car is allowed to wind down sufficiently, the oil will cool the turbo and prevent coking of the turbo. Water cooled units just improve on the previous versions.

Post by **Und3rprshUr** » Fri Jan 24, 2003 9:23 am

Another false correction....

its aircooled oil lubricated. Yes the oil does take away some heat from the turbo but is not made to just cool as the scoop is. The intake temp will be the same no matter with scoop or not. and turbo will almost cook itself with no scoop and no watercooling.

Take away the oil lines then what do you have? a non-;ubricated turbo. all turbo's utilize oil as a lubricant and water or air for cooling. the oil Does take away some heat but is not relied on. IF you own a Z as i do then you will now that the oil temp rises tremendously without the scoop and with drops tremendously.

In 85 they did have watercooled and scoop LT_Z Which then the scoop was to keep the same look going.

Post by **Exar-Kun** » Fri Jan 24, 2003 9:23 am

yep. I had a 1985 Z. w00t.watercooled turbo jacket=good. Coked turbo bearings=bad.-chet

Post by **LT_Z** » Fri Jan 24, 2003 9:23 am

The reason you let a turbo "wind down" is to cool the bearings with the oil. If you just make a pass and shut it down the bearings are so hot they scorch with the oil on them. Water cooling allows better cooling of the housing and shortens the "wind down" time

Post by **keepingthe240** » Fri Jan 24, 2003 9:23 am

What are the specs of the z31 turbo??? I need trim and a/r #'s of the 85-87

z31 Okay?

z31 Okay?

alright

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