2JZ best single turbo

[Draven]

I'm very tempted to get the new GTX35r82 from garrett... test out just how much bigger their balls are than the regular GT series turbos

[JustenGT8]

Both camps have merit and it's very much engine and even setup specific. I have built big turbo 4's that spooled well with the right manifold design and have a tight turbine setup with a good WG that produces good top end...both can work. I want the response the small TT setup gives...you won't get near that and have decent top end without a small a/r turbine, end of story.

[cambelt]

I got told the new GTX turbos have old diesel technology wheels in them and trying to sell them off as something special , is this true ?
Dave

[JZA70 R]

well since you got "told" it, then yes it must be true. and since you're now asking for confirmation on a internet forum, how bout we just wait for the garrett technician to come forward and confirm.

[Draven]

if you mean they've made a return to 11 full-blades, rather than the previous split-blade system... then yes. Everything else looks the goods tho - it's a struggle to find side-by-side comparison dynos tho

[indeecent]

I saw one of the gtx35's against the gt35 not long ago while searching for a new setup... Someone did a writeup on some site about it.
There were no huge differences, a few kw in the top end with loss to some midrange if i recall, or it had more midrange and less top. Can't find it again so I can't speculate too much. But its always going to be a tradeoff of one thing or the other, best thing you can hope for is increased efficiency at a given point, itll only be a few percent at best.

[JZA70 R]

The new GTX series offer increased horsepower potential compared to the same model in the GT series. This is by virtue of the 11 blade billet compressor wheel which yeilds increased efficiency and flow.

The beauty of it all is the customer can simply unbolt their GT35R chra and compressor cover and replace it with the new GTX35R chra and compressor cover with NO other modifications, retune and in theory net another 50+hp.

I think you will find these are the main selling points and real benefits of the new range of turbos, not the area under the curve.

[Phoenix01]

Area under the curve is the important part. Particularly with a medium sized turbo. Wouldn't that marketing strategy be best aimed at drag car/dyno queen sized turbos?

I suppose it depends on the application. These turbos are what I'd consider medium sized for a 2J, but I guess for someone bolting one onto a 3SGTE/SR20/EJ20/4G63 this would be considered as large.

[boxh34d]

The new GTX series offer increased horsepower potential compared to the same model in the GT series. This is by virtue of the 11 blade billet compressor wheel which yeilds increased efficiency and flow.

The beauty of it all is the customer and simply unbolt their GT35R chra and compressor cover and replace it with the new GTX35R chra and compressor cover with NO other modifications, retune and in theory net another 50+hp.

I think you can look at the GTX option slightly reversed too. The GTX in one size is usually capable of almost moving the same amount of air as the plain GT in the next size up. Eg, the GTX3071R at a PR of 2 is capable of moving between about 15 and 50lb/min. The GT3076R can pump 15 to about 48lb/min at the same PR.
The GTX3582R, can move more air than anything in the 37 range, and the GT4088R, whilst being capable of pushing higher pressure ratios.
Whilst I can see that when comparing a GTX35 with a GT35 the GTX will have poorer low end efficiency slightly less under the curve, and a bit more top end ability, it would surely have to be better all round than having to step up to a GT4088R to achieve a similar power goal.
Yay or Nay??

[JZA70 R]

something like that

[Phoenix01]

You raise a good point boxh43d.

Perhaps Garret should have used a new model number to place the GTX turbos above that of their predecessors, but below that of larger units, to better indicate their suitability. Seeing as it's performance reflects a slight step up in sizing, rather than being better across the board when compared to GT models that share the same number.

[Indelible]

yes but they are still the same turbo untill the boost is turned up very high(and they use the comp/turbine wheel sizes for specs, eg gt30 turbine on 76mm comp wheel=gt3076)
i have a gtx3076r on my vvt-i 1jz and it makes around the same power that a gt3076r did (on 20psi both turbos) but much quieter,currently making 311rwkw
the new billet machined comp wheels have a aerofoil like front edge that moves the air not cutting it like the normal gtwheel make much less suction noise, in my opinion if you can get a gt turbo cheap do it
unless your goin to be pushing that turbo to the limit, to actually benefit from the higher pressure ratio/flow characteristics

[boxh34d]

yes but they are still the same turbo untill the boost is turned up very high(and they use the comp/turbine wheel sizes for specs, eg gt30 turbine on 76mm comp wheel=gt3076)
i have a gtx3076r on my vvt-i 1jz and it makes around the same power that a gt3076r did (on 20psi both turbos) but much quieter,currently making 311rwkw
the new billet machined comp wheels have a aerofoil like front edge that moves the air not cutting it like the normal gtwheel make much less suction noise, in my opinion if you can get a gt turbo cheap do it
unless your goin to be pushing that turbo to the limit, to actually benefit from the higher pressure ratio/flow characteristics

I would say yes and no.
Whilst I haven't tried a GT to a GTX back to back for a direct comparison, the GTX3076R is capable of moving more air at any constant PR or compressor RPM compared with the the GT3076R, and moves the efficiency island more to the right accordingly.
In your example, the reason I would think that you didn't really make any more power, is because your engine is only capable of swallowing a given amount of air at a static PR. Changing compressor, (to any other turbo - GTX or not), would only give slight differences in power due to being more efficient at one point in your rev range compared with another. If sticking with a constant boost level, the GTX would only be of benefit if you either raised your engine RPM to use more peak flow, or made your engine capable of moving more air per revolution by increasing displacement, changing cams, headwork etc to take advantage of the extra available flow from the compressor throughout the revs.
The only other situation would be if the GT3076R was running out of puff towards the upper RPM range that you would see an improvement in going to the GTX compressor. Just doing some quick calcs on a 1JZ (I have no idea on your engine particulars) and having a look at the maps, it would seem that for that kind of power, the GT would still have a touch more in it. This kind of backs up the statement from above, there was no real difference in peak power.

Don't suppose you have back to back dyno runs for the turbos, as I'd love to see the difference in the bottom end power between the 2 different compressors.

[Indelible]

the gt wheeled turbo actually made more power than the gtx it made 315rwkw @19psi , but the gtx made 295rwkw @20psi on same dyno bout 2 months later
no other changes, looking for dyno sheets to post

[aristoman]

Precision 6265 Billet CEA turbo
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