Turbo Size's?

[Grizzly]

Hello all.

I am intrested if anyone can shed some light on a Problem i seem to have struck?

Ok, To put it in a Nut shell i have been chatting to a guy who works around the Corner from me, he works for a Place called Allide Signal who make most of Garretts turbo's in the Uk.

I have been pestering him about Turbo's etc, I am fairly up on Turbo's (Or i thought i was) any way last week i we got onto the Subject of Turbine wheels and Housings, I asked what was the Diffrence between a Q and P type wheels and he stood there with a Gone out look and said "a what?"

It would seem that garrett Uk ither dont use The Trim method or its done at a later stage in the manufacturing, he said its a Turbonetics thing and a True garrett does'nt use Trims only AR's? and as the Turbo its self gets bigger as does the turbine wheel (how it was put a T4 .96ar wheel is not the same as a T66 .96 ar wheel) so i am a little confused so i looked about and its not only garrett that changes this sort of thing KKK,IHI etc differ then Blitz,Greddy and HKS change again?

So basicly what i would like to know is do i have to Measure the Turbine wheel to compare the diffrent Specs ? this makes it a little harder to get what you want as not many Turbo Dealers will strip one for you to measure?

Thanks.

Chris

[Glenn Butcher]

Hi Chris,

Don't know if I can answer the question - but it looks like that guy is right.

Do you have the Garrett catalogue? I looked through it and there was nothing about "Q trims" etc. - just the size. See http://www.turbobygarrett.com/turbobygarrett/jsp/index.jsp and download the PDF Catalogue. (I attached a screen dump of their definition on trim.

From another Garrett catalogue:
http://www.gcg.com.au/technical/garrett%20gt%20ball%20bearing%20turbos.jpg

From: http://www.turboneticsinc.com/guidelines.html
Turbine selection is a variable based on intended use, weight, and desired response. Turbine power available to drive the compressor can be varied in two ways: 1) the Area to Radius (A/R) ratio of the turbine housing can be changed to alter turbine inlet pressure; and 2) the turbine wheel trim can be specified to effect an increase or decrease in turbine pressure for a given turbine housing A/R. (See data sheets for available turbine trim and housing information.) Initial recommendations for normal single turbocharger applications (assuming a controlled boost of 10 psi or less) may be selected as shown in the following table:

ENGINE DISPLACEMENT COMPRESSOR TRIM TURBINE TRIM TURBINE HSG
60-100 CID T3-50 Trim T3 Standard .36/.48
100-150 CID T3-Super 60 T3 Standard .48/.63
150-200 CID T3-Super 60 T3 Standard .63/.82
200-250 CID T4-S3 Trim T4 “O” Trim .58/.69
250-300 CID T4-V1 Trim T4 “P” Trim .69/.81
300-350 CID T4-V1 Trim T4 “P” Trim .81/.96
350-400 CID T4-H3 Trim T4 ”P” Trim .96/1.30
400-450 CID T4-H3 Trim T4 “P” Trim 1.30

[Grizzly]

The only thing i can think that Garrett must do is have a set size wheel for each Turbo and AR?

This is somthing i will look into becouse it would help me alot if i could get my Turbo's Uprated and use Garrett parts (Becouse there local)

It is slightly Confusing becouse i was even told there is many diffrent types of T core, some of the T4's are T04's (There is a diffrence), they have smaller Shafts and bearings making high hp hard to achive and more prone to fail.

I have to say in the last two weeks this guy has realy opened my eyes.

Chris

[clive]

May interest someone with all this info flying around that l have just put a TO4B up in the For Sale section , real cheap.

All the best Clive
clive@mazdarotaryclub.com
www.mazdarotaryclub.com

[J4P RX]

Can you explain about the T04B in completely no technical information, for people like me who are just confused by the above!

Basically, how much power is it good for and what level of boost. Is it difficult to do a single turbo conversion, what else do you need to do (eg changing pipework).

Lee