GCG Hiflow Hybrid on R33 GTS-t

[32vspecII]

so what other bolt on turbos are out there that make substantially more power than the 260rwkw that the hpiab one acheives ? I thought for the price of the the turbo thats a pretty good result .

[Cubes]

This is from Garrett's web site.

http://www.turbobygarrett.com/turbobygarre...R_700382_20.htm

http://www.turbobygarrett.com/turbobygarre...1R_743347_2.htm

[inabox]

so what other bolt on turbos are out there that make substantially more power than the 260rwkw that the hpiab one acheives ? I thought for the price of the the turbo thats a pretty good result .

What I would think a better option is the GT3071 with the internal T25 .86 exhaust. They are an early spooling powerful unit and reportedly good for 300rwkw. I have a few in the field here but no dyno results yet, as they are a new option here.

The negative is you will need an adapter for the base flange if using on a std manifold.

[Cubes]

As the Horsepowerinabox turbo uses the .7 comp cover this combined with the VG30DET exhaust a/r would most probably make more power than the GCG item that runs the stock .4 (I think it is) RB25 comp cover.

Inabox, Would you be willing to offer such an item IF the vg30det exhaust housing was supplied?

[discopotato03]

Cubes the real GT3071R's CHRA number is 700177-23 with the 84 trim 60mm GT30 turbine. Its on that site under medium frame comparisons .

An interesting thing to look at is the turbine efficiency of the more performance based turbo options . The GT2860RS (used to be called GT28RS) is 72% as is the GT3076R (GT30R in old speak or 700382-12 CHRA) . The GT3582R (old speak GT35R or GT3540R) is 70% . It starts to slip away with the 56 trim version of the GT2871R at 66% turbine efficiency and goes through the floor with those "other" GT3071R's that use the cropped (56.6mm vs the normal 60mm) GT30 turbine in the overbored GT28 exhaust housing . There's an even worse example in the GT2876R (old speak GT2540R Garret version) which uses the 76mm 48 trim T04S dinosaur compressor , around 60% turbine efficiency . The side note even says not recommended for performance engines as its not symmetrically sized ?

When you can find them the Garrett engineers will tell you that high turbine efficiency is critical to make it work well . You may think the difference between 60 and 72% efficiency is trivial but in the real world its huge .

When you consider the turbine and compressor pair major diametres a pattern begins to show .

GT2860RS 53.8 x 60.1 10.4%

GT3071R 60.0 x 71.1 15.6%

GT3071R 56.6 x 71.1 20.4%

GT3076R 60.0 x 76.2 21.3%

GT3582R 68.0 x 82.0 17.1%

GT28T04S 53.8 x 76.0 29.2%

Generally the closer in size the pair are the greater the turbine efficiency .

Cheers A .

[Sydneykid]

As the Horsepowerinabox turbo uses the .7 comp cover this combined with the VG30DET exhaust a/r would most probably make more power than the GCG item that runs the stock .4 (I think it is) RB25 comp cover.

Inabox, Would you be willing to offer such an item IF the vg30det exhaust housing was supplied?

Th GCG ball bearing high flow has a highly modified (machined) compressor cover.

[Bl4cK32]

The GT3582R (old speak GT35R or GT3540R) is 70% .

Got any more info on these turbos disco? Im looking for something for my 3L....how do these compare to the old GT35r's? Whats changed from the previous turbo...

Also noticed they have a GT32 series now??

[Cubes]

All I want is a nice efficient .8# turbine a/r internal gate turbo that makes close to 280rwkw without spending a fortune on a hks item.

[Bullant47]

All I want is a nice efficient .8# turbine a/r internal gate turbo that makes close to 280rwkw without spending a fortune on a hks item.

That's what I wanted too Cubes 260-280 rwkw every day of the week, that's why I am so happy with my GCG Hiflow with the VG30 rear end. And it fits on stock as.

Ian

[Roy]

Ford XR6 turbo?

[Cubes]

Roy,

I'm a little scared of the 1.06 rear.

All though the smallish comp cover should reduce spool time.

Bullet,

This Vg30 GCG highflow jobbie, say you accelerate from 2000rpm in second gear with a flat foot, what rpm does it kick? I'm assuming at that point it makes 19psi correct?

[Bl4cK32]

the 1.06 rear on the ford xr6....i dont think id like the way the power would come on as opposed to the way it does with the 0.8x rear....

[Bullant47]

Roy,

I'm a little scared of the 1.06 rear.

All though the smallish comp cover should reduce spool time.  

Bullet,

This Vg30 GCG highflow jobbie, say you accelerate from 2000rpm in second gear with a flat foot, what rpm does it kick? I'm assuming at that point it makes 19psi correct?

Hi Cubes, I'll do that test tomorrow for you and let you know, otherwise I would be guessing. I've only booted the car when it was at Oran Park last week and I wasn't concentrating on the RPM gauge or the boost gauge, but I'm sure it was less than 4000, just like the normal hiflow, but the power that it was making before it reached maximum boost was enormous and it came as a huge suprise to me. I'd never felt that before. I'll take note of what, where and when tomorrow when I do some testing and report back to you. OK Cubes?

Ian

[Cubes]

Thanks.

No doubt a few will be keen to see the results.

[bigcarl]

cubes the hpinabox gt30 will pull 280rwkws. i will post up my new shootout graph once my engine has been rebuilt with forgies. im putting in tomei poncams step ones and dropping comp from 9 to 1 to 8.5 to 1. may even fit a magic cat or at least something better than the one im running. as for this turbo being ordinary, well i dont have the budget for a high mount hks set up. so im very happy with the combination ive got . boost starts at 2500rpm and peaks at 3500rpm , and if i can find another 15 to 20 rwkws i will be over the moon because its a nice balance between power and response is what im looking for.

[discopotato03]

Black32 only the name has changed , they've got a unified system at last .

GT32's are all bush bearing except HKS's GT3240 which is another cropped bastardised turbine job . Don't mistake GT32 and GT35 compressor maps and look for the all important "R" for rolling element or ball bearing cartridge ie GT3076R .

Cheers A .

[Cubes]

It will be good to see the results bigcarl.

Have you any pics to share?

------

My airflow calcs tell me the RB30DET should have the XR6 Turbo on song around ~3600-3700rpm.

Doesn't sound so bad and it would definitely free up the top end VE for the 3ltr extending peak rpm power.

[czy18e]

IAN ! Ya stranger how ya goin?

You never rang to tell me you one lotto.

Thats an awesome result dude heaps happy for ya.

You should come out and visit,it has been -4 degrees and god knows what power im making cos of it.

Snow drift is fun too.

But we will be in forster in the next month so we will catch up.

[bigcarl]

pics of engine or turbo cubes?

[Cubes]

Anything you wish to share.

It would be nice to see the turbo on and also the turbo off, i.e its exh. wheel etc.