Best turbo for 550hp I5

[urquattro-island]

Is this the turbo you are refering to http://www.compturbo.com/products/in...&product=CT367

Looks very reasonable price even with the ball bearing option.

Wish i'd seen these before i bought my garret.

thats the one allright, looks nice. May want to try this, i think.

[A80Avant]

repo,
forgot to ask you,which is better the ballbearing or the thrust bearing as far as the life of the turbo is concerned?I mean if i wanted a turbo that will hold for quite a bit,which would be the one to choose?
the only info i have is that thrust bearing turbos are servicable while ball bearings though they last longer,they are not servicable

[Bram]

That Stg4 55 looks interesting to replace my GT3071R turbo some day. Will that one give me the same spool-up as the Garret Repo?

Cheers

[Jamo]

Is this the turbo you are refering to http://www.compturbo.com/products/in...&product=CT367

Looks very reasonable price even with the ball bearing option.

Wish i'd seen these before i bought my garret.

Yep that's the one I wanted to know about although since they've only been around since 2007 hard to judge the turbo life expectancy on the products.

[Audi_CQ]

Customer dynoed a 2.2l AAN with Schrick cams, my ex manny and a 67 a month ago. Got 615hp / 740Nm with little less than 2 bar.
They tried to raise the boost, but the boost didn't obey the Apexi avc-r like it used to, so they stopped there.
After dyno, the owner noticed that the turbo was loose, and immediately after tightening the nuts on the studs, the boost was 2,5bar again.
Normally the 67 gives 2 bar at some 3800rpm with a 2,2 litre fiver. Best power normally comes at 7000-7100.
Astonishing turbo, I must say. Ask from nick +500hp, as he had one in his RS2, and changed it into bigger one. I think he still occasionally regrets it...

Any idea what the backpressure was?

[repo]

With .63 the backpressure was 1,5 times boost.

With .82 never above.

I really cannot say much of long time reliability, but I can say, 3b bearings seem to hold a shock of any kind. We popped off a boost pipe a couple of times at 7000rpm anr 3,5 bar. No probs with the turbo. Not a sign of a defect.

On paper the 3b should endure longer than journal bearing. Luckily all CT turbos can be repaired in any turbo shop capable of balancing a T4. Including the 3b ones.

[Audi_CQ]

Normally the 67 gives 2 bar at some 3800rpm with a 2,2 litre fiver. Best power normally comes at 7000-7100.

This with .63 or .82?
Should work great on my 2.5 The Q-trim T66 SB I've got today doesn't get full boost before ~4300-4500.

[repo]

I see these figures when stepping on it on 5th at 3000rpm, .82 housing and journal bearing.

Smaller A/r turbine helped suprizingly little, if at all for spoolup. Only top end, of course is significantly better with 82.

[Audi_CQ]

A 2.5 with 3b bearings should make 2bar at ~3500 then in higher gears. Tempting...

[Bram]

Well, what can I say about compturbo.

Installed a stg4 ct355 .63 A/r journal bearing into ex-Kalsket's RS2, which had been running with gt2871 for three or so years.

It was wery responsive at low end, gave 2 bar way before 3K rpm.

Still, the tiny turbine side of the 28 caused the egt's to creep to astronomical level, and caused the EM to melt away.

I made new equivalent manifold, and installed the CT55 into the car. Customer stated, that there is no difference in the spoolup, as it starts to pull at some 2800-2900 rpm, and gives plenty of more grunt at the top end. Without egt issues.

Stg4 55 is 55mm in / 60mm ex, and can be chosen with a turbine housing or .48, .63 or .82 A/r.

.63 A/r gives nice 520 hp / 620Nm with 3b cams and less than 2 bar. I do not have any plots to show, without asking a permission from customers. With some port job, .82 turbine, a good exhaust and higher boost the 55 can be stretched to around 550hp, and if done right, without sacrificing too much of the spoolup.

New 57 is same family with the 55. Don't have any personal experience with that, but by the statements from non-audi owners have been encouraging.

58 is already a GT series, and requires at least stg5 (63mm) turbine. For stg5 there are the same turbine housing options than for stg4.

One particularly good CT for inline fivers is the ct350, which gave nice 400hp / 520Nm from a stock 3b and 1,4 bar.

These smaller CT's prices start from 990 eur. Ball bearing adds the price for 600 eur.

What else would You like to know?

Hi Repo,

Could you ask permission to the owner of that RS2 with 3B cams and the Stg4 55 to share the rolling road results please? I am very interested in that turbo and setup

Cheers

[A80Avant]

yup and not only you...me as well...

[pnanassy]

I cant wait to see any sort of RPM-Boost log from these superspoolin' turbos.
How do you calculate backpressure ratio,by dividing relative or absolute pressures?

Thanks,Peter

[v|ncenT^]

This with .63 or .82?
Should work great on my 2.5 The Q-trim T66 SB I've got today doesn't get full boost before ~4300-4500.

Is this on your 2,5L ?
I have a 'netics T62-1 ar.58 exhaust and ar.70 inlet..
I have full boost about 3900-4000rpm.
Wondering about getting an GTK550, heard that it spools up about 3500(ish) somthing or sooner, tried that one ?

[repo]

I reached one of the customers. The plotter was broken, so they needed to take a photo of the dyno frame.

On this one there was some slipping. Customer said he'll check if he has better curves soemwhere. This was not the best pull.

http://promo.pp.fi/temp/90/ryno.jpg

[A80Avant]

that is impressive,almost 500hp,although the top torgue figure is almost before 5000rpm.That is not 3500 or 4000rpm that these turbos are meant to go,right? what was the rest of the setup?