The difference from standard T04E and a GT30R is.
1- ball bearing ( faster spoolup / less drag on shaft.)
2-Better wheel design. (new tech)
3- read this
http://turbomagazine.com/tech/0405tur_turbotech/

4- You may think this is stupid. But GT turbo have a cool special sound.

Turbine housing doesn't affect compressor performance.
It only affect the power band.
Like a small TH a/r will spool fast and max out kick.
And a big TH a/r will spool later and make more power at top end.

And miss maching a big compressor with a small TH will not make a turbo that is best of both world. If you overspin the turbine and can barelly get the compressor into it power band. The turbo will not make any power.

 

a video how my previus Turbo boosted
http://www.968turbo.de/19bar.AVI
It was in 3rd 4th and 5th gear and I was NOT at WOT. I was running with a stucked wastegate and tried to regulate the boost with my foot.

Konstantin

 

Hello guys!

Anyone have moore inputs on this?

 

did u see alot of gains from the intake manifold. i was thinking about doing the same thing.

 

I am in the process of installing a gt40 compressor ( same trim as the gt35r) In a to4e .63 ar housing. Hopefully I"ll be going to the dyno soon. I just couldn't bring myself to buy a full gt turbo. To much work for me with such limited time. I think my set up will give me 90% to 95% of what a true gt center will give. At a fraction of price. LR is installing 75 mm gt wheels on 2.5 liters. Witch is huge. My turbo should do well.
Your gt30 is about the same size as a 46 trim turbonetics wheel.

 

What do you mean you have increased the Link boost settings from 5500rpm? You mean set the target boost higher? Have you got a MBC handy?

 

Sounds nice. Please let me know the results!

 

I think its important to have a shorter intake if you want hpīs without to much boost in the upper rpm range. Mine works very well and I can see a lot difference compared to stock one. Iīm now at 460 crank hp at 19 psi boost.

 

Yes, I have increased the target but it doesnīt help to get moore boost. Thats why Iīm going to change my compressorside and need to have much info before I go to decision.

I dont want to have bigger compressor than I need. My goal is 500 crank hpīs and I want the smallest C to reach that because I prefere a good powerband and fast spoolup. Then the car will be fast!

So I need to know how a GT30 with 55 mm wheel, trim 52 and a 57 mm wheel with trim 56 will spool and if someone here has installed these on our cars!

 

Hi Corleone,
Regardless of which compressor you change to,
it will definitely increase lag over what you're using
right now due to weight increase & load when boost
begins to build. If you're just running at 19-20psi, you
can offset the lag by milling the head to increase the
compression.

 

I donīt think thats completely true. A bigger C can also produce moore airvolume and therefore also a better pressurebuildup when itīs in the working range. Of course there will be some rpm later boostbuidup but moore important is from 4000 rpm and moore. For me its not important if I have 1,2 bar at 3000 rpm or only 0,9 bar. When I will go fast itīs 4000-7000 rpm that counts.

Do anyone of you out there has any experience of the bigger A/R 0.60 house with ported shroud to the GT3071 with the 53/71 mm C-wheel? It seems to be new and is on page 21 in Garrets new Catalog. It would stretch the C-map to the right and maybe this would be enought for me. Then I will keep my good response (same wheel as I have now) and also enought to produce my last 40 hpīs. Anyone? http://www.turbobygarrett.com/turbob.../downloads.jsp
right click and save as

 

BTW How did you measure the 460 bhp figure?

 

Itīs estimated by the 86-89% dutycycle at my 72 lbs injectors and 12,6 in Afr I have in my log.

 

Corleone

Don't mean to be rude, it would be meanfull if ran on a dyno instead of estimates!

 

Just waited for this!

Of course I will go to a real dyno like "Rototest" (www.rototest.com) that we have in my hometown. But... everything has itīs time and my car hasnīt been ready to do a dyno yet. There are things to be sorted out and now itīs winter here in Sweden.

But relax it will come and then I will show you all the graphs!