question for a friend

['91 240sx]

I dont know much about 300zx's(as you can see from the name I'm a 240 guy)but a friend wants to know what kind of power increase he would see with t6 turbos on his 90 300zx? Any help would be appreciated so he can stop bugging me to check, thanks in advance

[Und3rprshUr]

T6 turbo's mean nothing.

If your meaning t61 turbo or t66 you wil not notice power gain until you upgrade other things like fuel to run more boost.

I would say upgrade to some t04's and go jwt with ecu and injectors.

then you'll notice a almost huge improvement.

[nlzmo400r]

something as small as t6s wont give u your money's worth on a 3.o liter motor, but as previously mentiuoned, if u get something as big as a t66, obvious fuel upgrades will be needed, i think i saw some nismo 55occ injectors on ebay the other day, also, a t66 will almost only be good for top end when running high boost

[EZcheese15]

Yo, nlzmo, hate to burst your bubble, but a '90 Z is a twin turbo and there is no way he's gonna run twin T66's unless he has a multi million dollar bank account. And I doubt he's gonna run a single T66 as it costs nearly the same. Single's are hard to design for a V engine made for duals.

Also, like und3rpr3sre said, T6 means nothing. AFAIK, that is not even a true turbo size.

[nlzmo400r]

i didnt think t6 was an actual turbo, but i was referring to a single t66, ive seen it done before, but from waht u just told me im assuming a big single is easier on a straigh motor rather than a V?

[EZcheese15]

i didnt think t6 was an actual turbo, but i was referring to a single t66, ive seen it done before, but from waht u just told me im assuming a big single is easier on a straigh motor rather than a V?

Correct, since I-6 motors have both turbos on the same side, whereas a V motor has turbo's on opposite sides. It makes piping more difficult to run a single on a V. It's been done before on a Z32, as I have seen pics of it as well, it is just very UNcommon.

[nlzmo400r]

but it can be done? is that why all of the turbo set ups ive seen for the 35oZ have been twins? i always wondered why not just run a seemingly less complex single turbo, with a slightly larger turbo

[EZcheese15]

but it can be done? is that why all of the turbo set ups ive seen for the 35oZ have been twins? i always wondered why not just run a seemingly less complex single turbo, with a slightly larger turbo

Exactly. I've seen pictures of one company who did a single turbo setup on the 350Z, but the duals are much more common.

[nlzmo400r]

it just seems so wierd how twins would be easier than a single turbo, and u almost never see high hp supras with twins anymore, all of em have big t66,t78,t88 and whatnot for top end, and why is a straight 6 THAT much easier to do a single on? i know it IS easier, but do the cylinder placement make it that easy?

[EZcheese15]

it just seems so wierd how twins would be easier than a single turbo, and u almost never see high hp supras with twins anymore, all of em have big t66,t78,t88 and whatnot for top end, and why is a straight 6 THAT much easier to do a single on? i know it IS easier, but do the cylinder placement make it that easy?

Look at this way....On an I-6, it looks something like this:

| t | | t | | tb | IC

Where tb is throttle body, t is turbo, and IC is intercooler. The air comes into the turbos, then combines into a single pipe, up to the IC, and then right into the throttle body. Pretty simple.

On the Z32...

| | t| |t ic | | ic tb tb

Air goes into the turbo's, into the IC's, and into the tb's....simple.

On the 350Z....

| tb | t | | t | | ic ic

Now, air comes into each turbo, to each intercooler, then it's combines into one pipe that goes back to the throttle body (not much different than the I setup.

On a single turbo I-6....

||t|||tb|ic

Exactly the same as the twin setup, but even simpler.

However, he is a 350Z with a theoretical single turbo...

| tb | | | | | t IC

Now, you have to take exhaust runners from each cylinder (3 on the left, 3 on the right), channel them both up to the turbo for exhaust spool. Also, you'll want the turbo as equally spaced between the two sides of the engine as you can get, so that it provides consistant airflow from all cylinders. Then the air comes into the turbo, into the IC, and up to the tb. That part is easy. The difficult part is plumbing exhaust from both sides of the engine to the turbo.

[EZcheese15]

Poop.....the spacing didn't work out on my diagrams. Let me attempt to edit and fix all that stuff.

[EZcheese15]

Heck, well, I can't fix it.....but hopefully you can make them out. They aren't *too* badly fubar'd.

[Und3rprshUr]

Big single turbo is a trend like a fashion.

There is plenty of twin sequential systems running same hp numbers..

[nlzmo400r]

i made out your diagrams fine EZ, thanks for all the clarification, but i dont understand why a 'theoretically twin turbo'd' 35oZ would have to be set up any differently than a 3oozx twin turbo, and und3rprshur, a larger single turbo will almost always give u more power than two smaller turbo's, the twins will spool faster most of the time, but all of these hwy supras run large turbo's for top end, i havent seen twin turbo'd supras run over 55ohp or so, but ive seen single turbo'd supras easily hit 8oo+whp

[EZcheese15]

i made out your diagrams fine EZ, thanks for all the clarification, but i dont understand why a 'theoretically twin turbo'd' 35oZ would have to be set up any differently than a 3oozx twin turbo, and und3rprshur, a larger single turbo will almost always give u more power than two smaller turbo's, the twins will spool faster most of the time, but all of these hwy supras run large turbo's for top end, i havent seen twin turbo'd supras run over 55ohp or so, but ive seen single turbo'd supras easily hit 8oo+whp

I don't understand your question. Do you mean why a single turbo 350Z will have to be set up differently than a single turbo Z32? The single turbo Z33 and single turbo Z32 are obviously different set ups.

[Und3rprshUr]

Well trust me there is plenty of twin set-ups pushing well over 550hp..

you see what people let out which is fashion trend big singles..

If you go to japan you'd be suprised how many are still using a twin set-up..

its pretty hard to drift a big single turbo with a .96 or 1.06 ar turbine housing through a corner..

[nlzmo400r]

well yes its harder to drift because u have to wait for so long for spool, when drifting i assume u want power immediately or at very low rpms=smaller turbo's

[nlzmo400r]

I don't understand your question. Do you mean why a single turbo 350Z will have to be set up differently than a single turbo Z32? The single turbo Z33 and single turbo Z32 are obviously different set ups.

from the diagram u showed me, the z32 tt and z33 tt are differnt, why are they different if they are both v-blocks, or also, why would a single set up be different between them as they are teh same type of block?

[EZcheese15]

from the diagram u showed me, the z32 tt and z33 tt are differnt, why are they different if they are both v-blocks, or also, why would a single set up be different between them as they are teh same type of block?

Because the Z32 uses twin throttle bodies that are located at the front of the engine. The Z33 uses a single throttle body located at the rear of the engine.

[Und3rprshUr]

Don't under estimate the power of cheese

[nlzmo400r]

Because the Z32 uses twin throttle bodies that are located at the front of the engine. The Z33 uses a single throttle body located at the rear of the engine.

and im guessign the z32 uses twin throttle bodies only because its a TT from the factory, while the z33 isnt?, and if thats correct, what about TT'ing a non turbo z32, would that have a single throttle body like the z33 , except only at the front?, and one more question, why have the throttle body at the rear of the engine? as opposed to the front?

[Und3rprshUr]

z32 na to tt would be same upper intake manifold being two throttle bodies just like TT as its the same motor.

[nlzmo400r]

well then even stil, why have 2 throttle bodies if they're not 'needed', assuming the only reason for the 2nd throttle body is because of hte turbo's

[EZcheese15]

and im guessign the z32 uses twin throttle bodies only because its a TT from the factory, while the z33 isnt?, and if thats correct, what about TT'ing a non turbo z32, would that have a single throttle body like the z33 , except only at the front?, and one more question, why have the throttle body at the rear of the engine? as opposed to the front?

The NA Z32 also has twin throttle bodies. It's just the design of the intake plenum. Has nothing to do with being turbo.

The throttle body of the Z33 is located in the rear of the engine just because it's the design of the intake plenum as well. If you want to get down and dirty, they probably designed it that way so that they could lengthen the intake tract (by having to route it all the way to the back of the engine bay) so that they could add more air box resonators in the system to make the car quieter.

[nlzmo400r]

The NA Z32 also has twin throttle bodies. It's just the design of the intake plenum. Has nothing to do with being turbo.

The throttle body of the Z33 is located in the rear of the engine just because it's the design of the intake plenum as well. If you want to get down and dirty, they probably designed it that way so that they could lengthen the intake tract (by having to route it all the way to the back of the engine bay) so that they could add more air box resonators in the system to make the car quieter.

very good possibility about the resonators, thanks for all of the answers torry, i know i asked a lot of questions, but i really appreciate your help, how'd u get so damn intelligent? is it just experience with these cars, or did u go to school for themor something?

[EZcheese15]

well then even stil, why have 2 throttle bodies if they're not 'needed', assuming the only reason for the 2nd throttle body is because of hte turbo's

The Z32 uses a twin intake system, where the air filters are mounted in the center of the car, between the headlights. This is probably because that is where the most air gets into the engine bay with the design of the exterior of the car. Since it uses twin intakes, it makes it easier to design it to use twin throttle boddies as well.

With the Z33, which has a more open front end, more airflow is allowed through the front bumper all around, not just in the center. This allows the designers to offset the intake to one side and still achieve adequate air flow. The intake is mounted to one side, goes through a single airbox (as opposed to two), then goes into a single throttle body.

[EZcheese15]

is it just experience with these cars, or did u go to school for themor something?

Yes, and yes.

[nlzmo400r]

damn, you're on fire, haha, may i ask what are u studied? , and also, it sounds like the z33 is less complex than the z32?! (and i know Zs are known for their confusingness)

[Und3rprshUr]

Niether are confusing.. only confusing to the average joe..

[nlzmo400r]

well im the average joe, not having been around many Zs, i dont know much about them, however like to learn, so i pretty much soak up anytihng i can