Wanna switch from K26/27 to GT3071.......

[Ross]

Why when these are better?

Just me being stubborn and close-minded. I guess then I can call it an "RS2 conversion". And it saves the extra expense of 3" intake pipe, custom lines, downpipe etc.

Out of interest though (this is dangerous lol) what torque level does the 28 offer? Similar to RS2? And how must is the downpipe to go with it?

[Faheemo]

The Inlet restrictor is very dangerous as it has a tiny hole to limit the oil pressure which can become blocked with dirt and kill your turbo.
I am using a in line oil filter from forced performance which has built in restrictor as well as the filter. damn expensive but worth it i reckon. check it out:

http://store.forcedperformance.net/merchant2/merchant.mvc?Screen=PROD&Store_Code=FP&Product_Code=FP4ANFilter&Category_Code=

[Corey]

Out of interest though (this is dangerous lol) what torque level does the 28 offer? Similar to RS2? And how must is the downpipe to go with it?

I have no figures of my own yet as the engines are still being built but I believe they will exceed the RS2 by a significant margin.

$425 for the downpipe retail.

[maRS2]

What about surgin

from what I see from Kalsket those turbo make less boost at low Rpm than RS2's
I've got 2 bar at 2800 rpm with RS2 turbo

[maRS2]

If I did get every thing right the best turbo for me would be RS2 because the internals must have something "Magic" according to Mihnea with dual ceramic ball bering to increase spool up.
But that doesn't exist yet.

[maRS2]

What about surgin

from what I see from Kalsket those turbo make less boost at low Rpm than RS2's
I've got 2 bar at 2800 rpm with RS2 turbo

[Greg_S]

I have GTs on both my 10v and RS2. The RS2 sometimes smokes under power when the oil is cold (and the oil pressure is high) so I guess this might be the reason? What was the 'hard way' that you found out about them?

Damo was your's the Blue RS2 at Castle coombe in october?

[DamoM]

Damo was your's the Blue RS2 at Castle coombe in october?

Yes it was! Thankfully only oil surging into the head and spilling out onto the turbo....!

Looked a lot worse than it was.

[kalsket]

maRS2, remember that pressure has almost nothing to do with power (torque), only thing that matters is air mass. With bigger turbo 0.5bar boost can give you more air mass than smaller with 2.0bar boost. Therefore look only at power/torque figures.

You mension 2bar at 2800 rpm, how much power/torque does it give you? This is what I have calculated for GT28RS wich should be close RS2-turbo:
2800rpm 179hp 450Nm with 1,3bar boost
(over 400Nm from 2400 to 6000 rpm)

[maRS2]

I have about 600 NM at 3000 Rpm and already 310 Hp at 3500 rpm
Max power is 362 hp at 5500 rpm this is from dyno plot from guy with car with same set up as me also maped by Mihnea at about same time.

[maRS2]

If you use this HP formula:

HP = Torque(mKg) at xRpm X xRpm /716

you get form me at 3000 rpm 60 x 3000/ 716 = 251 hp

[maRS2]

This formula as you can see is also working for you

45 x 2800/716= 175,977

quite close from your 179 hp

[S2central.net]

Going by what has been said on the turbo's to date the 30 is a bit more laggy due to the larger turbine but this allows it to sustain higher boost further up the rev range.

Compare the 2 here

http://www.034motorsport.com/product_info.php?cPath=21&products_id=321

http://www.034motorsport.com/product_info.php?cPath=21&products_id=196

I chose the GT3071 as I am not bothered by the extra lag as it is being fitted to a 10v WR which has similar lag characteristics.

Dang that 3071 looks like a monster judging by the compressor map. What hotside did you go for Corey ?

I might have to play with the trusty turbo calculator today again - just to compare the theoretical max numbers on the 2871 versus the 3071. Looks like care is needed on the 3071 mapping to prevent it from surging.

Watch this space.....

Paul

[Greg_S]

Yes it was! Thankfully only oil surging into the head and spilling out onto the turbo....!

Looked a lot worse than it was.

Yeah I have the video from when me and angus were following behind you. Good new it wasnt too serious.

[Corey]

Dang that 3071 looks like a monster judging by the compressor map. What hotside did you go for Corey ?

Turbo spec is 2.75" inlet with .63ar, it has a funny shaped flange but as I have the matching downpipe it doesn't matter, if that answers your question Paul?