I5 GT Turbos 2871 / 3071 / 3076 / 3082 / 3582

[A80Avant]

thanks for the link

i believe that this trim idea of garrett turbos is not very good to describe the turbine housings.
it is a fact that the bigger the turbine impeller(inducer/exducer) the bigger the lag,but the smaller the EGTs in general
so according to garrett,you may have a trim 60 turbine impeller and still have small dimentions(but big diference between inducer/exducer) and that will cause high EGTs anyway.
If they had the actual inducer/exducer dimentions available that would be more useful.

Also with their calculations,when they are describing for the turbine wheel one number : say 56mm. Which one do they mean? Inducer or exducer of the turbine impeller? so that way i can calculate according to their equations the other dimention?

EDIT: according to their equations,the turbine diameter they post,should be the turbine exducer(or big diameter).Makes sense as in the 3076R it adds up as turbine inducer/exducer: 54/60mm --->hence trim 60

[Sonic]

You mean a boost spike?

Thats the one

[Jamo]

I imagine the problem with running on stock rods is the surge.

You mean a boost spike?

[Sonic]

I imagine the problem with running on stock rods is the surge.

[Jamo]

You could run Bram's setup of 1.7 bar on stock rods it's 518nm safe limit is considered 550nm IIRC, S2central.net is the man for that question.

[Rusty]

That's a really strong plot with fast spool. Shows how strong these turbos pull on the S2.

The same boost on an RS2 would be a lot less so that leads me onto the next question-

What sort of boost can you run on stock rods with a 3071?

[Jamo]

That's one of the best 3071r dyno plots I've seen, if your saying you have 368 at the wheels it equates to 450-460 at the crank.

There's more to be had as you can run 1.9 to 2.0 bar max and then run 1.7 to redline

[Bram]

My initial K26-GT3071R 0.63AR results for the current engine/clutch setup. Will post new info once I continue upgrading my Avant

ECU is not yet mapped to full potential of the turbo.
Max boost is 1.7 bar at 3000 RPM till redline. Need bigger IC, stronger clutch and one day a ported cylinder head.

[Jamo]

can someone tell me what the turbine 'trim' that garrett states is?

i know that turbos have inducer and exducer in their compressor/turbine housings,but i dont know that garrett means by that trim

http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech102.html

Garrett turbo FAQ page

http://www.turbobygarrett.com/turbobygarrett/tech_center/tech_center.html

[Rusty]

Good call, perhaps an 'Alternatives' thread to discuss alternative turbos other than the G's. However, stating what other turbos are comparable and leaving it there would be useful in the context of this thread, or in a 'Comparisons' thread.

[A80Avant]

Oh yes then i completelly agree about that.

cheers

By the way if anyone knows this 'trim' thing it would be useful

thanks

[Jamo]

It's not directed at anyone in particular mate, it's a case of I dont want this thread to turn into garretts are rubbish buy this turbo instead.

[EspenW]

which would be the equivalent turbonetics turbo to the GT2871R/3071 and how do they match up. has anybody fitted a turbonetics turbo to their s2

Yes indeed. Start a Netics thread and I will chip in with some info.

[A80Avant]

im sorry Jamo,
did i ask something irrelevant with the garrett turbos??

If that comment was intended to me,please let me know. I think i specifically asked something ABOUT these turbos so that i would know how they compare to others.

if this commend was NOT intended to me,then it's timing of post is wrong IMHO

[Jamo]

I did create this thread to specifically talk about the Garrett turbos and colate information about them into one thread.

I have seen that a lot of people keep trying to divert away from garretts to other turbos, i'll happily create one for discussions of those turbo if required.