This looks interesting... V8 Caldina

[4000GT]

Shock horror , I'm going to have to agree with vvega and akane on this one, the GT35 is a poor choice for this application. Even Garrett agrees with them.


In fact rom 700-1000HP the GT30 is a better choice, Below that the GT28RS is their preferred turbo.

It's all very well to get hot under the collar and say that people don't know what the original goals were, but get real. At the 1000HP level that GT35's become a reasonable choice, the Caldina chassis is well past it's limits.

Personally at 450HP I'd go for a couple of CT20Bs rather than TD05s

If the goal was 450WHP I wouldnt go for GT35's either, but sadly, we dont know if thats all he wanted to make, these motors easily make over 1000WHP with appropriate head cam and bottom end. If 450WHP was the goal on 12psi, just grab a couple of RB20 turbos for $200 opposed to GT35's at $4000.

Regardless my agrument isnt against the merit of smaller choice to make the current power he is making on that boost. Its to say the turbo he is using isnt a bad choice for the motor, people use them often on the UZ range, its just that the rest of the motor would need some work to make full use of them. You just said its a poor choice, then say it is a good choice at 1000HP, this agrees with my point. Though it looks like its actually 2X400HP, so at 800HP, at the motor? So more like 700WHP? A pity the owner cant chime in and talk us through he choice.

[the fallen303]

if he actually uses the turbo's to their potential, he'll have to change the gearbox while his missus goes in to get the milk and bread you can't really squeeze much more power through the w series box and have them last nicely. 460hp is plenty to have fun with but to start to crank things up will probably start to show issues with the rest of the setup, gear box, and like fifebob said, the actual design of the caldina chassis would also become a limit.

end of the day, it's a $&#$% nice example, making good power, very nice sleeper, and all in all, a well done conversion. sure people might not agree with what he's chosen, but hey, it works, so who cares

[4000GT]

if he actually uses the turbo's to their potential, he'll have to change the gearbox while his missus goes in to get the milk and bread you can't really squeeze much more power through the w series box and have them last nicely. 460hp is plenty to have fun with but to start to crank things up will probably start to show issues with the rest of the setup, gear box, and like fifebob said, the actual design of the caldina chassis would also become a limit.

end of the day, it's a $&#$% nice example, making good power, very nice sleeper, and all in all, a well done conversion. sure people might not agree with what he's chosen, but hey, it works, so who cares

I have to agree about the gearbox! I am glad it holds up to what it does! I went for an R154 on mine, as i couldnt find a V160. I will go Tremec if it fails down the track. The motor will also (at 10:1 compression) be the issue at more than 12-13psi from what I have read. I was looking at twins but I think exhaust plumbing may mean a single makes more sense. Looking at T51R or T04Z at this stage or maybe T88.

[vvega]

Twin GT3540R is a bit on the big side But that thing would haul, I wouldn't say it'd just scare Hondas at the lights. Supras, Skylines, other Caldinas

I think so too, especially he's only running 12psi and on what I think standard cams.

should go something smaller like in a TD05H Region, same PSI, more area under the curve = killing so much things on the road that you don't know what hit you, there will be EVO's and STI's look stumped with 's running across their face, I surely would too.

Actually its a bloody good choice. I dont think he is running after market pistons so compresion ratio is 10:1. So a bigger turbo will push that boost with more CFM and less temp... makes a lot of sense. The torque of the 1UZ is massive from 1,500rpm remember No one seems to comment on the turbine A/R with his turbo choice which would influence how well suited it is greatly...

Huh.......... Sorry I'm not technical enough to understand how that works, I'm sure I'll let Lith or someone else chime in about this bigger turbo = more CFM at the same PSI... Cheers.

i know my turbo's quite well and even i cant understand that pile of sh*t hes tring to push

in short its 2x 2 l motors
on a 2l motor a gt35 of any sort is laggy and crap

what people are tring to say is true
his turbo choice is ar*e

he could be making the same power over more of teh rev range and it woudl be more responsive at any givn point

guess its all down to knowing what your talking about
and akane your spot on teh money

Because you have built lots of twin turbo 1UZ's? You know $&#$% all. There is a twin GT35 1UZ making 1200WHP in Norway. You dont know the goals of the owner you dont know the specs of the turbo including turbine AR, so why dont you do the world a favour and keep your dumb $&#$% mouth shut, or try and deal with the facts instead of the made up fantasy land you live in pretending you know more about the tuning shop that did this conversion.

You believe all turbos make the same CFM at the same rpm at the same boost... you are retarded mate. Go google it and try educate yourself before you spew your half assed opinion on the rest of the internet.

Obviously a smaller turbo would be more responsive, you get the Captain Obvious award again and again... but you dont know his goals.

its better to keep your mouth shut and let everone think ur a idiot that open it at prove it all to everyone

i know more about turbo's there function and how they work than you probably know about sticking your head up your arse
something your obviously highly skilled at

this captain obvious thing
obviously it comes for a childhood of abuse i think you need to lern not to fixate on such past events and come up with new insults that attually havent been used in every argument youve ever had
its kinda sad and really shows that you dont have any ability to argue nor debate
iin short for that point
yes daddy was touching you in a bad place
and yes we all understand and can accept that you have some issues pertianing to that


as for knowing his goals....
he obviously(theres that word you love but still cant quite get a grasp of how to use it) isnit going for anymore than say 500 whp
why because hes got a w series box on there
so why spend maybe 6k on turbo's when the rest of your driveline cant support it....
do it once do it right.....but i guess you only understand how to do it one way....mr captian obvious

as for the gt35's
1000hp is the minuim your even want to tri to get out of them
but then if you cant read compressor flow and efficancy charts then you wouldnt understand why

look we can inderstand you have some daddy issues
but dotn bring them onto teh forum
in fact you could tri
0800 ilikemen
or
0800 ihaveacarrotupmyarseandwant ahaitymantopullitoutwithhisteethandlickmyscrottum

there prolly more to your taste
now ive finished laughing at you along with teh rest of toyspeed i think it wise you get out teh picture of your mun and have a wank to get rid of all your pent up frustation you have
from what ive herd...its all your good at
lol




v

[4000GT]

*Yawn*

[vvega]

lol thats how i felt when i read your post
same old shit differnet day
cant see how you can have any confidance left after getting shot down by anyone that knows anything
i guess your quite captian obviously delousion about what you attually know
v

[deaf_rattle]

the 300zx boxes are quite good behind high hp 1uzs.

[4000GT]

the 300zx boxes are quite good behind high hp 1uzs.

Really? I have never seen that done before... got a link to some info on it? Cheers

[Brick]

some people

[Akane]

Correct me if I'm wrong, but I think this is what's going on, due to "The turbo blowing hot air":








And I think it's bollocks when the 1UZ-FE is on it's standard VE, where it really is a 2x2L (460hp / 2 = 230hp each bank):


Is this right?

[Adamal]

I'd agree with that. If the smaller turbo can make the same power at the same PSI (Although you'll be closer to maxing the smaller turbo out), the smaller turbo would be the way to go, as the bigger turbo has more mass, and requires more flow to bring up its rotational momentum.
The energy required to make the smaller turbo get up to optimal rotational momentum and overcome the boost threshold would be a lot lower.

Now if the bottom end had been rebuilt with stronger stuff (Not to say the 1UZ isn't strong in its stock form), and the head had been given some work and higher lift, longer duration cams, then the engine could support more power than it currently does, which is where the GT35R's would really be pushed to assist in making big power. Then you could shut the wastegates a bit more, letting more exhaust gasses spin the turbos rather than being wasted, and probably get a better response than the current setup.

[4000GT]

Replace power for CFM. And the reason isnt solely because a smaller turbo will blow more hot air relative to a bigger turbo. I believe a bigger turbo pushes more CFM. If I read your chart right, thats basically what I am thinking and what I understand the other side to be explained.

Remember VE IICR is 3456 X cubic feet per minute / cubic inch displacement X RPM... the "standard' 1UZ VE is a function of the CFM...

Which is why I believe the GT35's turbo would make more power at the same boost, the engine is breathing more air. See what I mean? I could be wrong and are happy to be schooled here if someone knows otherwise.

[Adamal]

Hmm... Check your links out, they don't seem to be working. Well, for me at least!

I understand what you mean about bigger turbo's flowing more air, but given the same engine specs, where only the turbo's are different, and you're running the same PSI, lower down in the rev range, the smaller turbo will spool quicker and essentially provide more CFM of air at that point than the bigger turbo.

[mr_monkey]

you believe all turbos make the same CFM at the same rpm at the same boost... you are retarded mate.

lol. If the boost and engine RPM stay the same how could the turbos be flowing different amounts of air? If one turbo was trying to flow more air then obviously the boost pressure would rise and it wouldn't be a constant.

Its like saying.....

man my NA 2jz would inhale so much more air if the sky was larger (assuming pressures stayed constant)

Maybe i read it wrong or you typed it wrong.. or maybe you are next candidate for that "hy iym an mkay person but am mental pleaze now mi be4 u dudge mi" TV add.


-Nathan

[4000GT]

Hmm... Check your links out, they don't seem to be working. Well, for me at least!

I understand what you mean about bigger turbo's flowing more air, but given the same engine specs, where only the turbo's are different, and you're running the same PSI, lower down in the rev range, the smaller turbo will spool quicker and essentially provide more CFM of air at that point than the bigger turbo.

yeah cant get the pics to work, yes I agree in the lower rpm range (as in the diagram drawn), the smaller turbo would flow more CFM, but proportionally the larger turbo will flow more at any given psi but make those psi later, but ultimately make more power when spooled (in fact just prior). Keep in mind those ball bearing Garrett's spool pretty well.

[4000GT]

:D

you believe all turbos make the same CFM at the same rpm at the same boost... you are retarded mate.

lol. If the boost and engine RPM stay the same how could the turbos be flowing different amounts of air? If one turbo was trying to flow more air then obviously the boost pressure would rise and it wouldn't be a constant.

Its like saying.....

man my NA 2jz would inhale so much more air if the sky was larger (assuming pressures stayed constant)

Maybe i read it wrong or you typed it wrong.. or maybe you are next candidate for that "hy iym an mkay person but am mental pleaze now mi be4 u dudge mi" TV add.


-Nathan

Needed to add with the same efficiency... cheers. The air density is different...

[mr_monkey]

So you do agree that if engine RPM and boost pressure remains the same the engine will be inhaling identical units of air?

-Nathan

[Adamal]

Yea, could definatly make more power, but with the engine in question, I don't know if it would be able to make much more power without causing some serious damage.

I think what Akane and vvega are getting at is that the GT35R's are a bit overkill for the engine in its current build. If it were built tougher, then they'd be great

[Akane]

Still trying to understand how same PSI will equal to different amount of oxygen particles providing intercooling is used.

[4000GT]

Yea, could definatly make more power, but with the engine in question, I don't know if it would be able to make much more power without causing some serious damage.

I think what Akane and vvega are getting at is that the GT35R's are a bit overkill for the engine in its current build. If it were built tougher, then they'd be great

I agree, more will need to be done to the motor (if stock), to take advantage of the big turbo's. Again it really depends what the builder had in mind for the motor. Example, I am tending towards a T51R on my 1UZ, but I wont do the rods / pistons etc straight away, I want to see how far the stock motor can be pushed. if I dyno and get say 450WHP at 10psi it would be foolish for someone to say you should change turbo as it is too big to make that 450WHP you are making...