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Pulled the trigger brought gtx 3071 with tial v band

T

T3rra

New member
After 2 months off turbo shopping and research iv gone with gtx 3071 in a v band housing
Far from bolt on, but hopefully performance will far from standard.

Iv got two v band housing both tial 0.63 and 0.83

Current goal is around 400 hp as I'm going to be poor for a while now and don't want to strain the engine or stock clutch.
Which house do you think I should use? Start with 0.63 and if I need more or when I can safely run extra power go 0.83 or just go straight for 0.83

There was options where I could get the gtx fitted to a kkk hotside. This would have ment a bolt on exhulst set up with mod 2 the turbo mount. However the gtx turbine wheel is only 60mm base smaller then 26kkk at 64mm so would off required using 24kkk hot side I believe. Not sure on how this would relate to EGT and back pressure levels, with the fear off slight fab work need I went with the proven.

From what I can find gtx should be at 1 bar around 2.8 and capable off 500 hp. Plus can run higher boost if required due to the low back pressure levels.

Looking for around 400 hp on 1.3 bar could run 0.6 and be higher then stock power levels and spool around 2.4k not sure what surge will be like on such low boost. I don't think there would be any worse effects running 1.7 bar on this then runing 1.3 bar on 26/8 kkk
 
Very good choice.
I run a GTX3076R with the 0.83 Tial housing on a 3L engine, and considering how it spools and the very low back pressure readings I get I would suggest you to fit the 0.63 housing right away with a 2.5 engine. Even with the smallest 0.63 housing you will get better back pressure readings than you would with any KKK turbine.
 
Thank thom, is yours a genuine item or a hybrid bolt in? Or have you had both? Lots off billet wheel offering now. Had wondered if a T04e char with gtx size wheel would sort off be the same. I was very close to trying a hybrid but the back pressure was a concern.

Where do you think on 2.5ltr would plot on a gtx 3071 0.60 ar compersor map? I felt it MIT slightly left off the centre line

From your experience where would 1 bar spool? Current set up will see 1 bar on 26:8 at 3k in 4th 2.8 in 5th
 
Yes mine is a genuine Garrett.
My guess is that it would not be possible to get those Garrett X billet compressor wheels to flow as much as they can with turbines other than the GT ones, so mating one with a bolt-on turbine would be a waste.
The way I see it is that the turbine should be chosen in function of engine capacity then choose the smallest compressor wheel possible in order to get it to flow on the rightmost part for the higest RPM points. You don't want to be at the highest efficiency island at your engine rpm limit, but that is going to depend on how well your intake manifold flows up top, and maybe the 71mm X compressor wheel might even be a bit too big since it may not reach the regions where it should shine most and which would be above 5000rpm while the std intake manifold becomes IMO a problem beyond 5500 rpm.

Please take all this with a pinch of salt, as I have not fiddled that much with 2.5 engines, but I would still go with the 0.63 A/R housing on a 2.5.
 
Intake manifold has been lightly polished and ported how well I'm not sure, throttle body is as well but only b4 the butterfly. Is there any other mods you can recommend to utilise the gtx?

From what I could gather gtx 3071 will meet my power needs and still spool faster then anything else bolt in that could produce the power numbers. I could off gone for a small 28 but I didn't want to be at the top off the compressor map with the turbin spinning even higher rpm. Basically I was looking for a ture upgrade over 26/8 matched spool but more power and lower back pressure and detonation risk

0.63 housing will give fast spool and faster response, should that still make 400ish?
Using the 0.83 I could make more power, slightly longer spool but would I make simmler power on a lower boost ?

I'm looking to keep as much reliability as poss.







 
The problem with the 2.5 engine is that it will remain gutless at low revs unless you install a super small turbo, which obviously won't work up top. I don't see it possible to get "satisfactory" levels of both low end torque and top end power with the 2.5 engine.
The GTX3071R/0.63 is already a large turbo compared with a K26/8, and may not shine as well as it could with the standard intake, regardless what you do to it. Now if you use a shorter runner intake you will harm off boost low end further...
Again this is just conjecture so perhaps for now you may just do with what you have, install the turbo to see how it affects the way your engine performs then decide what to do next.
 
Congratulations T3rra, sound like you have done your homework. Similar to my own - it has the KKK hot side.
hope it goes together easily for you
George
944t
 
Well it was keeping me up at night. But now I'm hearing horror story's off v bands not sealing :/

Time will tell,
 

ORIGINAL: T3rra

After 2 months off turbo shopping and research iv gone with gtx 3071 in a v band housing
Far from bolt on, but hopefully performance will far from standard.

Iv got two v band housing both tial 0.63 and 0.83

Current goal is around 400 hp as I'm going to be poor for a while now and don't want to strain the engine or stock clutch.
Which house do you think I should use? Start with 0.63 and if I need more or when I can safely run extra power go 0.83 or just go straight for 0.83

There was options where I could get the gtx fitted to a kkk hotside. This would have ment a bolt on exhulst set up with mod 2 the turbo mount. However the gtx turbine wheel is only 60mm base smaller then 26kkk at 64mm so would off required using 24kkk hot side I believe. Not sure on how this would relate to EGT and back pressure levels, with the fear off slight fab work need I went with the proven.

From what I can find gtx should be at 1 bar around 2.8 and capable off 500 hp. Plus can run higher boost if required due to the low back pressure levels.

Looking for around 400 hp on 1.3 bar could run 0.6 and be higher then stock power levels and spool around 2.4k not sure what surge will be like on such low boost. I don't think there would be any worse effects running 1.7 bar on this then runing 1.3 bar on 26/8 kkk
Click to expand...

1.3 bar on each turbo will be similar for the engine apart in safety terms from the additional back pressure on the KKK which will limit the timing you can run and risk to the head gasket etc. However running 1.7 bar on the GTX turbo will put pressure on other things in the engine due to increased power levels and boost pressure so I don't think you could say it is just as safe as running the KKK turbo at 1.3 bar. That said the GTX is a great and modern turbo so you should see great results and more power at 1.3 bar due to the vastly more efficient compressor and reduced back pressure.
 

ORIGINAL: George Elliott

Congratulations T3rra, sound like you have done your homework. Similar to my own - it has the KKK hot side.
hope it goes together easily for you
George
944t
Click to expand...

George

Do you know the specs of your turbo?
 
I ran with a GT (not X) 3076 .63 on a stock 2.5 and it was very responsive. Note that we had the S2 ring & pinion which livens these cars up quite considerably. With that setup I could keep up with a well driven GT3 on the track. I would guess that the GTX 3071 .63 will be similar if not better.
 
Thanks, gtx will spool slightly later. 100 rpm but have more power.

When did yours spool by?
Did you mod the oem turbo mount?
Any issues with leaking v bands?

Thanks
 
Well looks like the turbo will be on sooner then thought. During my exhaust build the discharge stubs snapped so they offer to remove the turbo, with them doing the fab work for the turbo at a later date iv brought it all on now.

Only thing is new turbo didn't turn up today. However old one is off.

If someone who knows can give me a list off bit required for the job, or even a something to do while the turbo out. Aos seals e.c.t

Hg and front seals and belts are all new.
 
You will need some water pipe fittings and an oil line with a restrictor that screws into the turbo, I used one with a hole about 1mm on mine from memory. You will need the adapter for the mount and an extra shim for the oil seal and the relevant gaskets cut in copper or whatever suits the downpipe and crossover flanges you intend to use. Thom is the expert here though as he has done it all before with the GT series so I am sure he will chime in if required.
 
Thanks, can find anywhere that sells the flanges and clamps as there not in the kit.

Can you mount the turbo off the mount with fab work and run a new line to the sump return? Dose it have to go though turbo/ engine mount. ?
 
You can use the existing mount and return. You should probably take this opportunity to upgrade your downpipe to 3 inch if you have not already done so along with the rest of the system. V band weld on flanges are available from most reputable turbo shops.
 
Nick, mine is a Garrett GT30 ball bearing with KKK Hotside. Turbo mount pedestal is custom, but oil return drains through the OE Bracket. All D/P and exhaust mounts are OE.

It makes boost at 1900 and hits 1.2bar at about 2800rpm.

It's not state of the art, but it drives really well in general use while remaining reliable and simple.

If I never drive a 3.0t it will keep me happy [:)]

Keep up the good work T3rra
George
944t
 

ORIGINAL: George Elliott

Nick, mine is a Garrett GT30 ball bearing with KKK Hotside. Turbo mount pedestal is custom, but oil return drains through the OE Bracket. All D/P and exhaust mounts are OE.

It makes boost at 1900 and hits 1.2bar at about 2800rpm.

It's not state of the art, but it drives really well in general use while remaining reliable and simple.

If I never drive a 3.0t it will keep me happy [:)]

Keep up the good work T3rra
George
944t
Click to expand...

That sound unusual, I did not think you could use a kkk housing on a gt series turbo along with using the standard exhaust mounts. Are you sure it is a GT series and not a T series ball bearing with a kkk housing as that would make a lot more sense. I take it you don't have the info on the actual turbine and compressor wheel sizes?
 
Thanks for all the tips and advice. If I need more power I will change turbine housing rather then increase boost above 1.4 as iv only got a 3 bar map señor.

I had hope it was the back pressure that was keeping boost figure lower rather then manifold pressure.

Exhaust will be 3" all the way though. Would it be best to use v band only on turbine housing? And keep a flange set up lower down, make the discharge pipe longer so you can get to studs. This would help keep the v band alignment flush.

You can get gtx range in kkk hybrid. Iv been speaking with andy taylor at AET. Not sure how they do it, as the turbine wheel is smaller. I'm thinking they use 24kkk hot side. I was close to going this route. Only thing that concern was the kkk housing causing back pressure. I don't no off much data to prove this as I don't think any one done a back to back test on the hybrid vs garret housing.

Then this turbo turn up for sale. Looks like flanges and clamps are another £150

With the v band do you make the a male and female fit? Move one clamp down the pipe a little and set the other follward on the pipe? Best to do this in the flow direction? I think this would help against leave as it stager the joint.

Turning cross over in to a two peace item. Should I flange that rather then v band? Can ask for studs to be weild in so its just nuts one side.
 
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