Turbo question

quattrokid · 22-03-09, 03:12 PM

Have a Garrett turbo here, been asked if its a K24 7200 alternative turbo for a WR

ANSWERS on a p/c please

came in the box of engine bits from the donor quattro. Thought they had KKK's

kerker21 · 22-03-09, 04:23 PM

is it one of the 034 garrat replacements take a look at the part number and go check on there site www.034motorsport.com try that rich

quattrokid · 22-03-09, 04:29 PM

ok thanks John....

ok its got the following stamped onto it
BCC1
M24
A/R42

4N9115 34

on the hot side it has 10042 on it

4v6 · 02-04-09, 07:24 AM

A/r42 seems to say "a/r ratio" to me.

(Following is taken from an article on the web)

The turbine housing A/R (area/radius) ratio is the area (A) of any turbine inlet scroll cross-section divided by the distance from the center of that cross-section to the center of the turbine shaft (R). For any given turbine housing, A and R vary in the same proportions, so all As divided by their corresponding Rs yield the same dividend--which is the A/R ratio.

But brute size is not all that matters. The turbine's A/R (area/radius) ratio basically determines where the turbo starts to accelerate. A turbine housing looks kinda like a big snail shell. Unwrap the shell and it resembles a cone. Cutting off the tip of the cone leaves a hole--the cross-sectional area of this hole is the A in A/R. The hole size is important since it determines the velocity at which the exhaust gases exit the turbine scroll and enter the turbine blades. For a given flow rate, the smaller the hole, the higher the velocity--but the greater the restriction to exhaust-gas flow

The R in A/R is the distance from the center of the cone's cross-section to the center of the turbine shaft. A smaller R imparts a higher rotating speed to the turbine; a larger R gives the turbine shaft greater torque to drive the compressor wheel (because the lever arm R is longer).

quattrokid · 02-04-09, 04:39 PM

of course it is... silly me for not knowing that

thanks for the explanation and wee diagram.

so is this a "tuned" turbo that I have or standard?

100turbo c · 02-04-09, 05:34 PM

yes you are right they do have kkks as standard, wr ,s have k26,s and mb ,s have k24,s look on the bearing housing for a garret part number , there should be a little tag attatched to the bearing housing , if not it may have fallen off nothing on the comp cover will really tell you

quattrokid · 02-04-09, 05:37 PM

ok

cheers, will also do that tomorrow

100turbo c · 02-04-09, 05:41 PM

it may just have a garret comp cover fitted with a garret comp wheel upgrade, but could not tell you without seeing it, if your wondering how i know all this stuff its because i work at universal turbos so have to work with the damn things 5 days a week lol

quattrokid · 02-04-09, 06:05 PM

thats handy to know, could you recognise it from photos?

100turbo c · 02-04-09, 06:07 PM

hmmm , think tht may be a kkk housing with garret comp, will let you know for defor tomoz

22-03-09, 04:23 PM	#2
kerker21 Senior Member Classic Audi Club Member Join Date: Jul 2007 Posts: 1,412	is it one of the 034 garrat replacements take a look at the part number and go check on there site www.034motorsport.com try that rich __________________ chairman of the quattro owners club 85 UR WR Quattro 52 ford transit faf specialised big hit mtb ex Z1000R owner ex KTM Duke owner

22-03-09, 04:29 PM	#3
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	ok thanks John.... ok its got the following stamped onto it BCC1 M24 A/R42 4N9115 34 on the hot side it has 10042 on it __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

02-04-09, 04:39 PM	#5
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	of course it is... silly me for not knowing that thanks for the explanation and wee diagram. so is this a "tuned" turbo that I have or standard? __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

02-04-09, 05:37 PM	#7
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	ok cheers, will also do that tomorrow __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

02-04-09, 06:05 PM	#9
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	thats handy to know, could you recognise it from photos? __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

02-04-09, 07:24 AM	#4
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	A/r42 seems to say "a/r ratio" to me. (Following is taken from an article on the web) The turbine housing A/R (area/radius) ratio is the area (A) of any turbine inlet scroll cross-section divided by the distance from the center of that cross-section to the center of the turbine shaft (R). For any given turbine housing, A and R vary in the same proportions, so all As divided by their corresponding Rs yield the same dividend--which is the A/R ratio. But brute size is not all that matters. The turbine's A/R (area/radius) ratio basically determines where the turbo starts to accelerate. A turbine housing looks kinda like a big snail shell. Unwrap the shell and it resembles a cone. Cutting off the tip of the cone leaves a hole--the cross-sectional area of this hole is the A in A/R. The hole size is important since it determines the velocity at which the exhaust gases exit the turbine scroll and enter the turbine blades. For a given flow rate, the smaller the hole, the higher the velocity--but the greater the restriction to exhaust-gas flow The R in A/R is the distance from the center of the cone's cross-section to the center of the turbine shaft. A smaller R imparts a higher rotating speed to the turbine; a larger R gives the turbine shaft greater torque to drive the compressor wheel (because the lever arm R is longer).

02-04-09, 05:34 PM	#6
100turbo c Grown up member Join Date: Feb 2008 Location: hampshire in new milton Posts: 350	yes you are right they do have kkks as standard, wr ,s have k26,s and mb ,s have k24,s look on the bearing housing for a garret part number , there should be a little tag attatched to the bearing housing , if not it may have fallen off nothing on the comp cover will really tell you

02-04-09, 05:41 PM	#8
100turbo c Grown up member Join Date: Feb 2008 Location: hampshire in new milton Posts: 350	it may just have a garret comp cover fitted with a garret comp wheel upgrade, but could not tell you without seeing it, if your wondering how i know all this stuff its because i work at universal turbos so have to work with the damn things 5 days a week lol

02-04-09, 06:07 PM	#10
100turbo c Grown up member Join Date: Feb 2008 Location: hampshire in new milton Posts: 350	hmmm , think tht may be a kkk housing with garret comp, will let you know for defor tomoz

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