PTE T71 DBB Turbo (w/ Billet Comp. Wheel)

[racing fan]

Originally Posted by MIX

Does this have a divided turbine housing; dual ball bearing as well?? Is the exhaust housing from the Garrett GT4294R unit or from the GT4202R unit? Also, what A/R's are available for this turbo?

What is the most RWHP that can be produced from this turbo if it was bolted onto a Supra with the following supporting mods:

- 6-Speed V160
- Fully built Boost Logic 3.0L (block and head w/ stock size valves)
- Stock intake manifold
- Twin scroll, dual wastegated exhaust manifold (provided the turbo has a divided ex. housing)
- HKS 272 Cams
- Full 4" MP/DP and 4" exhaust
- VP C16 race fuel
- No Nitrous (EDIT)

MIX

It is divided and it is also DBB. The exhaust housing is the same on both turbos you mentioned and A/R options are .98, 1.12, 1.28, and 1.44.

[racing fan]

Originally Posted by turbodragnovice

Why wouldn't you just get the 74mm version or heck the precision gt42-76 if you are going to get the same exhaust housings and wheels as the 71. I couldn't imagine spool would be much different.

For the guy that was asking, I think the pt71 and the gt42-71 would make much different power levels and spool differently even though they are "71"s.

The 71mm turbos will spool much quicker than a 76mm and significantly quicker than a 74mm.

[brianmoss69]

Originally Posted by racing fan

The 71mm turbos will spool much quicker than a 76mm and significantly quicker than a 74mm.

please explain because i thought the exhaust housing was the difference in spool characteristics for the majority of your power band?

[Driftracer3]

Originally Posted by brianmoss69

please explain because i thought the exhaust housing was the difference in spool characteristics for the majority of your power band?

The larger compressor wheels have more mass, therefore need more energy to move, and that equates to more lag. Yes, same turbine, very different compressors.

[Reid@SP]

So I don't think I missed it, but is the 71billet available with a twin scroll housing?

Reid

[racing fan]

Originally Posted by Supra eX-Driver

So I don't think I missed it, but is the 71billet available with a twin scroll housing?

Reid

YES it is. In a GT42R frame with a 5" inlet and 4" outlet.

[93.5turbo]

Originally Posted by turbodragnovice

Why wouldn't you just get the 74mm version or heck the precision gt42-76 if you are going to get the same exhaust housings and wheels as the 71. I couldn't imagine spool would be much different.

For the guy that was asking, I think the pt71 and the gt42-71 would make much different power levels and spool differently even though they are "71"s.

You are correct, the GT42 is a much larger frame turbo with a bigger hotside and would be laggier than the regular PT71... but make more power up top*

[Reid@SP]

That's good to know, I thought I heard somewhere that precision didn't make divided housings under 76mm, must have been wrong. I would loe to rock a 71 billet with an SP quick spool valve!

Reid

[silviastud]

Originally Posted by Supra eX-Driver

That's good to know, I thought I heard somewhere that precision didn't make divided housings under 76mm, must have been wrong. I would loe to rock a 71 billet with an SP quick spool valve!

Reid

You did hear right, that's what they have been talking about most of this thread. There isn't a PTE turbo that's a 71 with a divided exhuast housing. BL was just recommending a GT Series that is similar but a large frame turbo.

[Reid@SP]

That makes more sense to me now. My question now is if the garrett equivilant would have a billet wheel or not? Sorry if this was covered, I feel like I'm not quite on the same page here.

Reid

[Driftracer3]

Originally Posted by Supra eX-Driver

That makes more sense to me now. My question now is if the garrett equivilant would have a billet wheel or not? Sorry if this was covered, I feel like I'm not quite on the same page here.

Reid

Silvia is incorrect. The turbo that Zohair is talking about is a Precision/Garrett hybrid. Its a GT42R turbine(divided housing) with a Precision billet 71mm compressor. Its also available with a Precision 76mm compressor.

[racing fan]

Originally Posted by Driftracer3

Silvia is incorrect. The turbo that Zohair is talking about is a Precision/Garrett hybrid. Its a GT42R turbine(divided housing) with a Precision billet 71mm compressor. Its also available with a Precision 76mm compressor.

Correct, there is also a billet 76mm compressor wheel available.

[silviastud]

Originally Posted by Driftracer3

Silvia is incorrect. The turbo that Zohair is talking about is a Precision/Garrett hybrid. Its a GT42R turbine(divided housing) with a Precision billet 71mm compressor. Its also available with a Precision 76mm compressor.

My appologies, I guess I didn't grasp what was being described fully myself. Sound like they were talking about a Garrett that came with a 71mm billet wheel, didn't realize it was a combo.

But it's still correct you can't purchase a divided housing on a PTE turbo straight from them?

[Reid@SP]

Well now that we have everything sorted out..... lol

That sounds like a very potent combo. What would be the hotside options?

Reid

[Driftracer3]

Precision makes divided housings for stuff like the GT42 and GT45, but nothing else.

Reid, you can get .98, 1.12, 1.28, and 1.44 housings.

[silviastud]

Originally Posted by Driftracer3

Precision makes divided housings for stuff like the GT42 and GT45, but nothing else.

Reid, you can get .98, 1.12, 1.28, and 1.44 housings.

Sweet thanks for the info!

[turbodragnovice]

What is the spool difference between the gt42 with precision 71mm billet compressor wheel and the gt42 with the precision 76mm wheel?

Is the only thing changed from the (gt4294 and gt4202) to the precision (gt42-71 and gt42-76) the compressor wheels?

Is there a difference in spool or power from the gt4294 and the precision gt42-71mm billet wheel with the same housings?

Do the gt42-71 and gt42-76 precision turbos share exhaust wheels and exhaust housings?

I am really trying to nail down my single choice so I can just buy one, already.
Are the precision gt42 units as reliable and as well balanced as well as the garrett counter parts? How do the warranty's differ? What is the price difference?

[NUKLRSIX]

The smaller HPQ wheel is available with the brand new updated Precision 71mm billet turbo, many are already in use with the Buick Gn guys.

http://www.turbobuick.com/forums/tur...as-landed.html

Another little tidbit of info no one knows about is that the HPQ wheel is the exact same wheel as the Turbonetics S-Trim available on GTK turbos and others specified with the S-trim wheel.

Turbonetics sells a divided housing for this wheel up to 1.06, this would work great for you guys wanting a divided housing for the precision turbos.............. .no divided housing for the HPS wheels yet unless going to a GT42 frame as mentioned above.

I will post the part numbers off the digital Turbonetics catalogue tomorrow.


87 GN Hardtop

250ci Stroker, Girdle, GN1 Heads, Fast XFI, Razors Alky, PTC n/l, 3.5 DP, Tial WG/BOV, GTK-72mm BB

[Driftracer3]

Originally Posted by turbodragnovice

What is the spool difference between the gt42 with precision 71mm billet compressor wheel and the gt42 with the precision 76mm wheel?

Is the only thing changed from the (gt4294 and gt4202) to the precision (gt42-71 and gt42-76) the compressor wheels?

Is there a difference in spool or power from the gt4294 and the precision gt42-71mm billet wheel with the same housings?

Do the gt42-71 and gt42-76 precision turbos share exhaust wheels and exhaust housings?

I am really trying to nail down my single choice so I can just buy one, already.
Are the precision gt42 units as reliable and as well balanced as well as the garrett counter parts? How do the warranty's differ? What is the price difference?

The difference is one is a 71mm and the other a 76mm. Turbine sides are the same, just Garrett GT42 turbines. Spool is similar with 4294 and 42-71, but the 71mm will make more power.

They are realiable and are just hybrids. Garrett turbines with Precision compressors. Warranty is 12mo/12k miles.

[turbodragnovice]

Is it possible to get a precision garrett hybrid gt42-71 with the new precision billet 71mm compressor wheel and a T6 divided housing? Will the T6 foot print hurt the spool up?


Will a precision billet 71mm turbo out preform the garrett hybrid in spool up, max power, or powerband, ect? Is there a divided housing available?

[RussianMKIV]

divided housings usually hurt top end power. that said the precision housing will be slightly more efficient power wise. spool wise divided housing will slightly outperform it if the header is designed properly for it or if used with the spool valve.

[luchocamp]

Originally Posted by Driftracer3

The 71GTS and GTQ have different sized turbine wheels. The HPS and HPQ just have updated aerodynamic design turbines.

there is a picture of the old 71 billet from precision vs the new 71 billet both in journal bearing... did they have same part number ?

[gamimnon]

to give you guys an idea, my regular 71dbb with a .81 hotside, non devided, spools at 4500, makes power to 8. i have not maxed out the turbo but others have around 850's, so its defintly making alot of power for the spool.

[racing fan]

There are a few new billet 71mm turbos available right now but only in the small frame. Let me know if anyone is interested.

[TwinTurbo_SixSpeed]

Can you post the details/specs/options for the new billet 71's?