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ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

t28 boost	Mon, 21 February 2005 03:53

just wondering what ppl think is the maximum psi that can be run from a t28 turbo?? i know that a lot of nissan ppl say not to run more than 14psi but it seems that a few ppl are running more than that from a t28 roller bearing turbo.. wat do u guys think is the limit?? i have a high flowed t25/t28, w/internal wastegate.. Thanks [Report message to a moderator]

cramet
Occasional Poster

Location:
warrnambool
Registered:
March 2004

Re: t28 boost	Mon, 21 February 2005 06:17

t28's r spose to handle 17psi max according to silvia aust web site so more if it is hiflowed [Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: t28 boost	Mon, 21 February 2005 07:31

i know of people who have gti-r's that are running 20psi on the standard turbo that seem to make decent power [Report message to a moderator]

ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

Re: t28 boost	Mon, 21 February 2005 08:38

JESUS!! thats seems like heaps from sucha a small turbo, thanks guys, i thought i would end up having to buy another turbo to cope with 20psi.. now im getting excited bout the 4AGTE [Report message to a moderator]

NVD05X
Regular

Location:
parra
Registered:
June 2003

Re: t28 boost

Mon, 21 February 2005 08:51

cramet wrote on Mon, 21 February 2005 17:17

t28's r spose to handle 17psi max according to silvia aust web site so more if it is hiflowed

this is corect

[Report message to a moderator]

ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

Re: t28 boost	Mon, 21 February 2005 09:26

thanks guys [Report message to a moderator]

TE72_Turbo
Forums Junkie

Location:
Canberra
Registered:
May 2002

Re: t28 boost	Mon, 21 February 2005 10:24

Are you talking about an SR20 T28? If so, I have run 19psi with mine (S14 T28 on a 4AG) for over a year without drama. This seems to be the limit for outright power on my setup, as any more boost makes more midrange, but not peak power. Cheers Phil [Report message to a moderator]

fatmr2
Forums Junkie

Location:
sydney
Registered:
November 2003

Re: t28 boost	Mon, 21 February 2005 10:56

i have a t28 and i run 20 psi. goes sweet [Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: t28 boost	Mon, 21 February 2005 11:06

i think the compressor probably starts to run out of efficency at 20psi and starts to make more heat than power but having said that manifold pressure is only an indication of the flow restriction the engine creates. [Report message to a moderator]

ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

Re: t28 boost	Tue, 22 February 2005 20:04

thanks evry1, i got a brand new 1 so all will b sweet!! YAY!! [Report message to a moderator]

nabs478
Regular

Location:
Melbourne
Registered:
March 2003

Re: t28 boost	Wed, 23 February 2005 01:50

go for 20psi....dont be weak!! [Report message to a moderator]

YelloRolla
Forums Junkie

Location:
On your mum!
Registered:
May 2002

Re: t28 boost	Wed, 23 February 2005 02:03

Turbo's run out of efficiency not at just peak boost BUT rather at pressure ratio vs total airflow. IE a T28 may be good for 17psi on it's original Nissan motor at 6500rpm where efficiency may still be acceptable. That same turbo on an inline 6 displacing 3.0L will not be happy at 17psi at 6500rpm. It will depend on your set up; remember pressure ratio has more involved that just the base size of the engine vs boost/rpm (as measured at the manifold) so it's no good telling me that it is a 4A GE. [Report message to a moderator]

ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

Re: t28 boost	Wed, 23 February 2005 03:57

ok then what else will affect the efficiency of the turbo?? yeah i am using it on a 4age, but what else will effect the airflow : pressure ratio?? if thats what ur talking about? wat do u think would be the pressure output of the t28 at peak efficiency and when will it be made?? [Report message to a moderator]

YelloRolla
Forums Junkie

Location:
On your mum!
Registered:
May 2002

Re: t28 boost

Wed, 23 February 2005 07:00

ke35 - 4AGZE wrote on Wed, 23 February 2005 14:57

ok then what else will affect the efficiency of the turbo??

yeah i am using it on a 4age, but what else will effect the airflow : pressure ratio?? if thats what ur talking about?

wat do u think would be the pressure output of the t28 at peak efficiency and when will it be made??

And so it begins that I wonder why I bothered replying in the first instance. Confused

The pressure ratio/airflow peak efficiency covers quite an area of any given compressor map (ideally you will cut a line right through the middle of the peak efficiency island).

Pressure ratio = pressure abs + boost/pressure abs. Where pressure abs = 14.7 and boost = 14.7 psi the answer will be a pressure ratio of 2.

Now if you shove a restrictive filter (say 2psi pressure drop) and a restrictive intercooler (say 3 psi drop) your pressure ratio (to achive 14.7psi manifold pressure) will now = edit/2.55 and in-turn your turbo will need to spin about edit/22.5% harder to achieve the desired boost - figure another 35,000 rpm shaft speed Shocked

(based on a base shaft speed of 200,000rpm).

This is what will hurt the turbo.

As far as your T28 is concerned? I don't have the comp map for it so I cannot determine it's suitability.

none of which was the intended point to mentioning this in the the first instance. Rather that there is more to it than just 17psi!

edited due to late night realisation that I frigged up the math.

[Updated on: Wed, 23 February 2005 13:03]

[Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: t28 boost

Wed, 23 February 2005 07:42

YelloRolla wrote on Wed, 23 February 2005 13:03

Turbo's run out of efficiency not at just peak boost BUT rather at pressure ratio vs total airflow. IE a T28 may be good for 17psi on it's original Nissan motor at 6500rpm where efficiency may still be acceptable. That same turbo on an inline 6 displacing 3.0L will not be happy at 17psi at 6500rpm.

It will depend on your set up; remember pressure ratio has more involved that just the base size of the engine vs boost/rpm (as measured at the manifold) so it's no good telling me that it is a 4A GE.

True True

Shaft speed is the best indicator for the flow potential of a compressor.

[Updated on: Wed, 23 February 2005 07:45]

[Report message to a moderator]

NVD05X
Regular

Location:
parra
Registered:
June 2003

Re: t28 boost

Wed, 23 February 2005 12:48

4agte wrote on Wed, 23 February 2005 18:42

True True

Shaft speed is the best indicator for the flow potential of a compressor.

i thought you'd need more specifics on the compressor turbine itself, the compressor housing size and the total maximum reliable shaft speed...

not just shaft speed...

[Report message to a moderator]

4agte
Forums Junkie

Location:
Toronto, Downtown
Registered:
September 2004

Re: t28 boost	Wed, 23 February 2005 12:54

yes maybee i didnt go into enuf detail. i was not referring to comparing turbochargers but rather the same turbo on different engines you cant use boost to determine the amount that that the turbo is flowing. You could be making 20psi on one engine and 17psi on the other engine but the turbo shaft speed could be identical. So the turbo is working just as hard on both engines even tho the pressure readings are different. Which brings me back to my other point that manifold pressure is just a measurment of the amount of restriction the engine creates. [Updated on: Wed, 23 February 2005 12:56] [Report message to a moderator]

NVD05X
Regular

Location:
parra
Registered:
June 2003

Re: t28 boost	Wed, 23 February 2005 13:29

indeed... now i see what you mean... [Report message to a moderator]

ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

Re: t28 boost	Thu, 24 February 2005 06:59

yes i completly agree and i do understand wat ur saying thankyou i bought a new turbo and expecting to recieve a turbo saying t25/t28 on the tag stuck on the side it reads type: T04E part no: T3/T4 serial number: is this the wrong tag or the wrong turbo? sorry bout the picture size i cant resize very well [Report message to a moderator]

NVD05X
Regular

Location:
parra
Registered:
June 2003

Re: t28 boost	Thu, 24 February 2005 09:34

that looks like my T28 so i'd say its the wrong tag... [Report message to a moderator]

Allan
Forums Junkie

Location:
Melbourne
Registered:
May 2002

Re: t28 boost	Thu, 24 February 2005 09:43

id me more worryed that looks like a rip off not a genuine garret (note the missing G on the exhaust housing and bland ID tag) im no experenced new turbo buyer but looks dodgey to me! Allan EDIT: also looks like a fairly ugly casting! [Updated on: Thu, 24 February 2005 09:44] [Report message to a moderator]

NVD05X
Regular

Location:
parra
Registered:
June 2003

Re: t28 boost	Thu, 24 February 2005 09:46

indeed the missing G is very suss... [Report message to a moderator]

TE72_Turbo
Forums Junkie

Location:
Canberra
Registered:
May 2002

Re: t28 boost	Thu, 24 February 2005 10:47

I've seen these turbos for sale on Ebay, and been a bit concerned about their origin & quality, you'll have to let us know how it goes KE35-4agze! Its definately modelled off a garrett, the comp housing has a very similar shape to an RB26 GTR turbo, except that the wastegate actuator bolts to the front, like an SR20 turbo... but then the exhaust turbine has less blades, more like an aftermarket garrett GT series turbo. strange. [Report message to a moderator]

ke35 - 4AGZE
Regular

Location:
Sydney
Registered:
April 2004

Re: t28 boost	Thu, 24 February 2005 20:04

yeah i know that.. thought it may be a little dodgy but for $550 wit a 12 month warranty its worth a go, i plan on upgrading in the future anyway...yeah il let u know how it goes thanks for that!! i thought it was a t28 due to the size just that the tag had me a little worried thanks boys [Report message to a moderator]

Allan
Forums Junkie

Location:
Melbourne
Registered:
May 2002

Re: t28 boost	Sat, 23 April 2005 13:19

just a warning mate..... http://pforums.company-hosting.com/forums/showthre ad.php?t=67183850 http://pforums.company-hosting.com/forums/showthre ad.php?t=67183144 [Report message to a moderator]

EldarO
Forums Junkie

Location:
Perth, WA
Registered:
December 2004

Re: t28 boost	Sun, 24 April 2005 16:36

turbo produces set pressure... now compare the difference between the pressures between more (bigger) piping, and less (smaller) piping. obviously if a turbo has less room to fill, it will do it quicker and at a higher PSI. turbo lag would then be less wouldnt it? Eldar.O. [Report message to a moderator]

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