Turbo help

[americanjebus]

Okay. I am the noob. Ill ask first.

What is the A/R?

What is going on when people say "50 trim?" I think I have a base idea. I just want it explained right

=]

I copied and pasted this from my old physics project on how turbos work. i'll post it up later but i want mdc or a moderator to read it first before i go posting it.

A/R: This stands for Area Radius, this is the radius of the turbine wheel + the radius of the area of the opening where the air escapes. These are huge factors in the way a turbo operates. The biggest reason is because the size of the A/R determines how well air is able to leave the system at various engine speeds or for various engine sizes. The smaller the A/R the faster the wheel will be able to accelerate but the total volume of air capable of passing through is diminished. The bigger it is the slower it accelerates but the top end volume that can pass through is much better.

Trim: quite possibly the most discussed and honored aspect of a turbo. This is determined through some simple algebra and is directly proportional to the size of the wheel on either the compressor or turbine. Bigger wheels equal better compression, smaller wheels equal better acceleration.. The graphic helps identify the difference between the inducer and the extducer aspect of the wheel.

Trim = (inducer²/exducer²) x 100

 

[TurboStreetCar]

i hate trim, because everyone calls there turbo by a trim when it actually doesnt have any real usefull value about the turbo. for example u can have a gt28 50trim and a gt40 50 trim. both turbos have the same wheel proportions as in the inducer to exducer proportion is the same. but the wheel on the gt40 is double the size. only time trim matters is if u are looking at a specific turbo, and the trim is an option. in the case that ur talkign about a specific turbo, THEN and ONLY THEN does thetrim have any meaning.

kinda like when u walk up to someone and say hey what turbo is that, and they say, "its a 50 trim" if u looked at a motor and the turbo had no markings on it but 50 trim, would u kno without measuring anything (parking lot or car show situation) what kind or size turbo they had?

 

[mk3_supra]

Just got an 89 turbo supra turbo was working fine for a while. But after my clutch burnt out i noticed i wasnt hitting boost i'd just floor it and nothing. When i drove it before i would start to hear this high pitch whistle but now its gone any help?

this was about a year ago so here goes again any help?!

 

[88supraTT]

is it like a supercharger or is it like a turbo(if you know what i mean(supercharger noise is very bad))?i have a vid of my car having a supercharger if you want to see it, pm me i will email it to ya.have you checked shaft play and check all your connections.


caleb

 

[mk3_supra]

is it like a supercharger or is it like a turbo(if you know what i mean(supercharger noise is very bad))?i have a vid of my car having a supercharger if you want to see it, pm me i will email it to ya.have you checked shaft play and check all your connections.


caleb

super charger noise high pitched whistle boost leak?!:icon_conf

 

[MmmBoost]

or compressor wheel chipped, or assembly out of balance makes a high pitched whine...

 

[DDR_Man70]

does anyone know where i can find turbine blades for my ct26? any stock replacement will be fine as long as theyre in good condition. thanks.:1zhelp:

 

[MDCmotorsports]

does anyone know where i can find turbine blades for my ct26? any stock replacement will be fine as long as theyre in good condition. thanks.:1zhelp:

If I can judge a person by their question.... you don't need any thing to do with a turbine or its blades. You need a new or rebuilt turbo. Call it a day.

 

[str]

hey does anyone know why my turbo would be failing to give me boost and limiting my RPMs? I hear turbo induction and a blow off but I get no boost! I have a 87 supra turbo. I think it might be a vacume leak any suggestions?

 

[Mk3runner]

If I can judge a person by their question.... you don't need any thing to do with a turbine or its blades. You need a new or rebuilt turbo. Call it a day.

what he said home slice.. look man theres no way around it just get the damn thing rebuilt and be happy with it till you gather the funds for your 1jz swap. but really tho until then just get your ride up to par. after yanking half that brittle crap off I figure at least $1000 to get it street worthy... which isn't shit compared to what I spent to get my engine assembled.

 

[DDR_Man70]

the blades are chipped up on mine. has vitually no shaft play but the seals are leaking. i need new seals too.

 

[F_T_F]

im curious what caused it though

 

[Mk3runner]

I kinda wondered also... but I just said screw it. its been pounded on for years so I told him just to rebuild it and be cool.

 

[starscream5000]

hey does anyone know why my turbo would be failing to give me boost and limiting my RPMs? I hear turbo induction and a blow off but I get no boost! I have a 87 supra turbo. I think it might be a vacume leak any suggestions?

Search under boost leak.

 

[Cedrock15]

how hard is it to rebuild a turbo yourself? I rebuilt the head of the engine and wondering is its harder to rebuild the turbo? If now how long does it take to rebuild the turbo once it's out for a first timer.

 

[MKIIINA]

difficult to rebuild - not really
balancing it to the correct tolerance..... much more difficult

 

[Shytheed Dumas]

how hard is it to rebuild a turbo yourself? I rebuilt the head of the engine and wondering is its harder to rebuild the turbo? If now how long does it take to rebuild the turbo once it's out for a first timer.

Read through this, and then send to Jon to have it done right and you'll end up thanking yourself.

http://www.supramania.com/forums/showthread.php?t=3934&highlight=rebuild+live

I got a chance to see my very own turbo rebuilt by Jon last week, and while it's true that "there isn't all that much to it" in terms of moving parts, there are many pitfalls, from balancing to proper cleaning, and any one of them will produce a toasted turbo as soon as you start the car or boost it. Anything that spins at 120,000 rpms better be done exactly right the first time it's put together.

 

[Cedrock15]

haha just what i thought, prob. just buy a rebuilt turbo instead of doing it myself

 

[mkIIIman089]

2X resurrection!

 

[7Mboost]

EDIT didn't see date posted.