Anyone Running A 'horsepowerinabox.com' 3071r Or 3076r?

[Fat_Tony]

I was thinking the Tewakit version is diffierent to the RB and Ford dumps as it says "Garrett 5-bolt dump" Haven't seen a picture though.

I'll try and contact them to see the diiference.

If not maybe I'll go the 0.82

[JonnoHR31]

.71 isnt a genuine garrett rear housing.

http://www.turbobygarrett.com/turbobygarre...T30/GT3071R.htm

thats the part numbers for the proper gt3071

[badhairdave]

Trick is to run the .82 IW.

If you wish to run the .6 or .7 RB style 5 bolt turbine housing or .6 Garrett xr6t style you will have issues with boost creep.

To help with boost control the best method is to run a nice big bell mouth. The splits tend to improve gas flow of the turbine wheel while due to the 'typical' split design it reducing the available area 'around' the wastegate flap.

As the flap opens it partially blocks the dumps wastegate pipe, not good for a turbo that is running a flapper sized borderline for its application.

HPIAB I can recommend; tweekit have never got back to be on several occasions when querying their products so sadly I cannot recommend them.

Agree that you need to run the .82 if you want an IW, atleast on a 3071.

The issue isn't due to the flap opening as there is actually heaps of room for the gas to escape around it and get into the dump if it's done right. I could wire mine fully open and it would still peak at 1.2bar (as opposed to 1.4 with the actuator attached).

Also agree that you should avoid tweakit. In the past they have mislabeled or misrepresented the turbos they sell on their site with incorrect specs and photos. That on it's own is enough for me to be cautious at the very least.

[conan7772]

.71 isnt a genuine garrett rear housing.

http://www.turbobygarrett.com/turbobygarre...T30/GT3071R.htm

thats the part numbers for the proper gt3071

So who makes the .71? HKS item ?

Sounds like a good middle ground to me.

.63 = sledgehammer

.83 = progressive

What do you reckon

[Dale FZ1]

Also agree that you should avoid tweakit. In the past they have mislabeled or misrepresented the turbos they sell on their site with incorrect specs and photos. That on it's own is enough for me to be cautious at the very least.

The ceramic coated housing shown in the linked advert has the word Garrett cast into it, suggesting it is a genuine Garrett casting. The turbine/wastegate discharge area is not a "true" GT30 style design, but is very very similar to the GT25/28 style.

All of which would make one suspect that there is an error in the description fields, perhaps regarding the A/R and the use of a T3 flange pattern. None of which means it couldn't be made to fit, but would want some further discussions with the seller before purchase so you end up with the product you think you're going to get.

Garrett advertise a GT3071 using a T25 flanged housing, which in fact uses a slightly smaller 56.5mm turbine as per the HKS GT2835. The difference is that HKS actually cast theirs with a T3 mounting flange.

[JonnoHR31]

So who makes the .71? HKS item ?

Sounds like a good middle ground to me.

.63 = sledgehammer

.83 = progressive

What do you reckon

.71 is usually a milled out stocker housing with a cropped ~56mm turbine.

[discopotato03]

I believe the truth of the matter is that the turbines in Garrett GT3071R's are GT30 std or modified so either way a GT30 UHP turbine .

Turbines and turbine housings are designed to be a matching set and to work together as a set just like a wheel and a tyre .

The issue here is that years ago HKS wanted to use the modified or cropped GT30 UHP turbines in GT25/GT28 sized turbine housings (in some apps) and the results were never brilliant .

Personally I think it was a case of the bean counters overruling functionality in favour of price .

My bottom line is that if I want a GT30 based turbine to function properly I have to use it in a GT30 based turbine housing - end of story . If I wanted to compromise the turbos and engines potential I wasn't serious to start with .

AFAIK the only decent "T3" flanged turbine housings for the cropped GT30 UHP turbines are the HKS ones in waste-gated GT Pro S form . They also do ones for the std GT30 UHP turbines and are intended for GT3037 Pro S turbos .

Garrett could make them by profile machining their GT30 IW ones to suit but haven't yet so far as I know .

At the end of the day the Skyline type turbine housing is a convenient way to bolt a housing/turbo to the existing manifold and dump pipe flanges , no one ever said it was the best way to make a GT30 based turbo work properly .

I think the fact that HKS went to the lengths they did to end up with those GT Pro turbine housings should tell us something , they went a long way away from the Nissan style wastegate and dump system because it obviously couldn't deliver at higher outputs - or with a GT30/based turbocharger .

What you have to ask yourself is do you want it merely to fit together cheaply and easily or do you want it to function properly as a package .

Your calls , A .