Turbos...were to start for the painfully ignorant...

[no_8wire]

I have done research etc on turbos...steel good ceramic evil etc...know how they work and what have you...

But for the life of me I cant figure out what relation a/r ratios have to do with the spec of the turbo...
Or for that matter what sort of turbo I need...


Ignorance is NOT bliss...I can tell you that!
1.8 Turbo...
VF10? ( popular with 4agte..to small?)
VJ26???
TD05 ( of a 2L...but boost high enough?)
TD27
T3
T28?
VF21
VF8 I have no idea what all the numbers mean...apart from model nums etc...


Can some one enlighten me on what relevance a/r ratios have on a turbos performance?

[Lloyd]

Might help to mention what engine, mods etc you've done and what you're wanting from the turbo (quick spool, just top end etc)

[no_8wire]

7agte...

wanting to run 14psi, like to be a full or near full boost at 3600-4000...or before...

[sergei]

why exactly you want to run 14psi? Some setups will feel much better and be way more drivable with say 10psi...

[Akane]

Have you decided if you wanna go hi compression low boost, or low compression high boost?

What's your budget? rangimods or legit?

So much things to take into consideration.

[no_8wire]

Im not past rangi mods, but I prefer to aviod them...
At this point budget is not an issue
about 8.5:1 so low comp high boost...

[EVLGTZ]

Talk to Bazda.

Hes got onto some pretty efficent t3/4 and they make some good power on the old 7agte

[no_8wire]

I was going to...however all the questions I have been asking him lately...I didnt want to annoy him...

[4000GT]

You ned to educate yourself on the elements to consider in determining the turbo which bet suits your application and needs. Things such as the turbine wheel size, exhaust housing A/W, compressor wheel and cover and A/R etc. Its always better to make a decision you feel comfortable with because you understand it. Try corky bells "mazimum boost" for a starter.

Andrew

[Mr Revhead]

You ned to educate yourself on the elements to consider in determining the turbo which bet suits your application and needs

i think thats what hes trying to do, asking where/how to go about it!
i for one am also lost when talking about specific turbos and a/r etc.
i did find a site somewhere that had good info on learning all that.... when i get home ill post it up if i still have it

[Crucible]

7agte...
wanting to run 14psi, like to be a full or near full boost at 3600-4000...or before...

Yeah bazdas the guy to talk to, I think most of the guys here turbo 4age/ze's so spooling times will vary being 1800cc. he was getting full boost at 4800 rpm on low comp ze and said he was getting 15psi at 3000rpm on the new 7agte, not certain if the new motor has the same spec T3/4? youd have to ask him

[4000GT]

You ned to educate yourself on the elements to consider in determining the turbo which bet suits your application and needs

i think thats what hes trying to do, asking where/how to go about it!
i for one am also lost when talking about specific turbos and a/r etc.
i did find a site somewhere that had good info on learning all that.... when i get home ill post it up if i still have it

Yup, thats why I suggested a book! Corky Bells "Maximum Boost". Its a very good book for the beginner. I would not trust advice on forums that much.

[Mr Revhead]

yup good call
yeah same.... the site i was talking about was put up by a turbo manufactorer

[Crucible]

You ned to educate yourself on the elements to consider in determining the turbo which bet suits your application and needs

i think thats what hes trying to do, asking where/how to go about it!
i for one am also lost when talking about specific turbos and a/r etc.
i did find a site somewhere that had good info on learning all that.... when i get home ill post it up if i still have it

I would not trust advice on forums that much.

Yeah I agree, but then again peoples comments can be very helpful. Hands on experiance with differant turbos can be just as helpful as a book as it is a combination thats been tried. I got all the info I needed off this forum for the turbo I needed, as my main concern was spool time and that the turbo wasnt going to max out in the higher rpm range. I decided on my turbo by advise from other people and the experiance with the setups they were using

tnt

[Phothog]

ah the lovley world of turbos... i have been doing it for just over 6 years and i still dont know all...

VF10 <-is off a Auto single turbo legacy ej20
VJ26 <-you dont want to touch this one Wl-T 2.5lt Diesel mazda/ford
TD05 ( of a 2L...but boost high enough?)
TD27 <- is a nissan engine they have a Hitachi HT12 or Garrett TB25 the garrett would work & is easy to upgrade.
T3 <- depends on what spec i'll say for a steet car .48 A/r turbine std shaft 60 trim comp .60 A/r comp hsg
T28 <- the GTiR TB28 there is a 4efte starlet in taurange running one of these makes boost by about 4000rpm
VF21 <- from memory it is a primary turbo off a twin turbo legacy, would be toooo small
VF8 <-is off a manual single turbo legacy

-----------------------------------------------------------------------------

A/R stands for Air Ratio meaning size of the housing.

Compressor housing A/r, a larger a/r cover is good for the "Bling" more room to make a nice polish but will affect the spool, if you went to a smaller housing the spool time should be reduced.

Compressor wheel, a large wheel is nice for braging rights, " oh yea bro i have a 60-1 compressoer wheel on my 1300cc starlet" nice but that wont work. the compressor wheel is an important part of the turbo, if it is too small it will boost good but will tapper down up in the higher rpm range, if it is too big it can slow down the shaft speed & affect when full boost happens.

Bearing housing, the most vital part of the turbo, it holds the bearings & allows the turbo to live.

Turbine wheel, another important part of the turbo, too small & it will affect how much hp it can produce, too large mean more mass for the engine to try & push around.

Turine housing, just about the most important part of the turbo,
like the compressor & turbine wheels if it is too small it can boost real early But with strangle itself up the high end of the rpm range,
too large & you can make good hp out of it, But it would not boost untill later in the rpm than you would want...

Some good examples i have supplyed/built,

2jz Supra T04E compressor cover .60 A/r 60-1 Compressor wheel 59mm inducer, P trim turbine shaft 64.6mm exducer .70 A/r turbine housing.
On this car, started to make Boost by 2800rpm full boost by 3200rpm
(word of mouth by owner)

4age FX-GT TB03 compressor cover .60 A/r super 60 compressor wheel
48.2mm inducer standard TB03 shaft .36 A/r turbine housing.
was only on 6psi of boost but had wheel spin in 3rd gear.

i just realised how long this post is... i can post up some bad examples if people want...

[no_8wire]

very helpful! You have PM...

[Crucible]

Wow, theres some good info!

A/R stands for Air Ratio meaning size of the housing.

Compressor housing A/r, a larger a/r cover is good for the "Bling" more room to make a nice polish but will affect the spool, if you went to a smaller housing the spool time should be reduced.

This is something Ive never been too sure on, How does the Compressor housing affect the spool time? Does a smaller comp/housing just start flowing air quicker? I always thought the Turbine housing was the main part that affects spool time?

i just realised how long this post is... i can post up some bad examples if people want...

I Dont want to hijack this thread but could you post some up...... I love to learn, Excellant Turbo info as usual Phothog!

tnt

[Phothog]

a larger A/r means more air to fill smaller a/r means less air to fill
& smaller piping (not the stupid 3" i/cooler piping from the turbo belive me i have seen it on a Ca18det) helps as well...


where do i start.. lolol

how about the kid who rode in on his bike, pulled a TV (Detroit/Mack/Caterpillar) compressor cover out of his back pack & asked about making his FWD Mitsi 323 1600 do 7 seconds down the quarter mile.
i never really do this to customer but i laughed at him.

had another guy drive in with a evo 2 with one of those stupid Super T70 things, saying it was aliile too laggy & do we have a smaller housing that he could take away right there...

a customer with a 7mgte supra brought in a XS power T04B turbo,
the turbine housing A/r was a 1.15 which would be good on a rotor, it did have a part number of FC3/FD3 which from memory are RX7 chassi numbers.
(had another guy say that is was a tad laggy for his rotor)

one of good customers son brought a Super T70 for his H22 Honshitda
i was there & looked at it & laughed at him... 1.32A/r turbine housing
i know Vtec loves turbos but that is tooooo big for one of them.

[4000GT]

ah the lovley world of turbos... i have been doing it for just over 6 years and i still dont know all...

VF10 <-is off a Auto single turbo legacy ej20
VJ26 <-you dont want to touch this one Wl-T 2.5lt Diesel mazda/ford
TD05 ( of a 2L...but boost high enough?)
TD27 <- is a nissan engine they have a Hitachi HT12 or Garrett TB25 the garrett would work & is easy to upgrade.
T3 <- depends on what spec i'll say for a steet car .48 A/r turbine std shaft 60 trim comp .60 A/r comp hsg
T28 <- the GTiR TB28 there is a 4efte starlet in taurange running one of these makes boost by about 4000rpm
VF21 <- from memory it is a primary turbo off a twin turbo legacy, would be toooo small
VF8 <-is off a manual single turbo legacy

-----------------------------------------------------------------------------

A/R stands for Air Ratio meaning size of the housing.

Compressor housing A/r, a larger a/r cover is good for the "Bling" more room to make a nice polish but will affect the spool, if you went to a smaller housing the spool time should be reduced.

Compressor wheel, a large wheel is nice for braging rights, " oh yea bro i have a 60-1 compressoer wheel on my 1300cc starlet" nice but that wont work. the compressor wheel is an important part of the turbo, if it is too small it will boost good but will tapper down up in the higher rpm range, if it is too big it can slow down the shaft speed & affect when full boost happens.

Bearing housing, the most vital part of the turbo, it holds the bearings & allows the turbo to live.

Turbine wheel, another important part of the turbo, too small & it will affect how much hp it can produce, too large mean more mass for the engine to try & push around.

Turine housing, just about the most important part of the turbo,
like the compressor & turbine wheels if it is too small it can boost real early But with strangle itself up the high end of the rpm range,
too large & you can make good hp out of it, But it would not boost untill later in the rpm than you would want...

Some good examples i have supplyed/built,

2jz Supra T04E compressor cover .60 A/r 60-1 Compressor wheel 59mm inducer, P trim turbine shaft 64.6mm exducer .70 A/r turbine housing.
On this car, started to make Boost by 2800rpm full boost by 3200rpm
(word of mouth by owner)

4age FX-GT TB03 compressor cover .60 A/r super 60 compressor wheel
48.2mm inducer standard TB03 shaft .36 A/r turbine housing.
was only on 6psi of boost but had wheel spin in 3rd gear.

i just realised how long this post is... i can post up some bad examples if people want...

Just a note, just because a turbo come off something that does not sound like it would be a good fit, does not mean that it, or a condiguration of it wont be a good match. The last turbo we had on my Porsche was off a combine harvester, though we changed the turbine.

[Phothog]

[quote="CircuitLevin]Just a note, just because a turbo come off something that does not sound like it would be a good fit, does not mean that it, or a condiguration of it wont be a good match. The last turbo we had on my Porsche was off a combine harvester, though we changed the turbine.[/quote]

Quite right... one customer got a turbo off a mack truck & bolted it on to his rx7, another one got a 3k turbo off an ferry & bolted that to his rotor 517Hp @6000 rpm...