GTX35R or Precision CEA 6266 on an RB26?

[Cochee]

I have recently blown one of the turbos on my GTR.
Fortunately the week before i had ordered a new manifold.

I went a 6Boost manifold with split pulse design and twin wastegates(will be external).
I will also be running a Vipec plug and play with the plan of running E85.

Now my decision is what turbo to run.

The GTX35R has a 62.5 compressor wheel and a 68mm turbine wheel with a T4 .82 housing.
The 6266 has a 62mm compressor wheel and a 66mm turbine wheel with a T4 .84 housing.

Both turbos are rated at '750'hp and are dual ball bearing.
The main positive i can see with the 6266 is that it comes with a divided housing.

What are peoples opinions as i havn't seen many people running the Precision turbos on RB's, however the supra and evo guys seem to be doing quite well with them.

[Madhav]

Big in the USA supra crowd. Have made decent power etc. however from what I read the 6466 seems to be a really good new model. Similar spool to the 6266 but makes basically as much as the 6766. Win win.

However if you are set on the 6266, from the extensive testing by sound performance, the journal bearing models had the same response as the ball bearing models. Only advantage of going ball bearing was slightly better transient response. But remember BOTH have billet cores so if I were to do it again I'd just go a journal bearing. Bonus is the price too. Soooo much cheaper for a journal bearing billet in comparison to the GTX Garrett. Definitely go the divided housing too.

For some more information look up 'full race' website and speak to Geoff as he has a 34r from memory and did some nice work with a Borg Warner efr setup.

[Yakky Bear]

go the garrett....

http://www.turbodirect.co.za/site/index.php?option=com_content&view=category&layout=blog&id=26&Itemid=20

they compare a gt35r and a 6262. id be worries if precision still use ceramic ball bearings.

[SimonR32]

How much power are you chasing on what fuel?

[Alt_F4]

For some more information look up 'full race' website and speak to Geoff as he has a 34r from memory and did some nice work with a Borg Warner efr setup.
Geoff will likely recommend an EFR 8374 twinscroll (if available), or his other previous golden child turbo, the Airwerks S300SX 8375 (journal bearing - cheap!)

[Cochee]

I don't have my mind set in any turbo in particular and am just looking at options at the moment. Was leaning towards the garret due to reputation and towards the precision for the divided housing.

Aiming for around 550 with E85 obviously with it being responsive as possible.

[Cochee]

Also not to worried about the price as I'd rather pay for the better setup instead of a cheap one that I wasn't happy with and had to change down the line.

[SimonR32]

550 on what kind of dyno? I should have asked that before :)

Also stock motor?

[Cochee]

Will probably get Sean to tune it so hub dyno.
Motor will be getting rebuilt so I also need to look at cam options.

[SimonR32]

Personally I would go smaller, the 35R sits between being bullshit fast (T04Z) and bullshit response (GT3076R) so you kind of end up with a meh set up.

They way I see it you have 2 options, if you want to chop 99% of people in a straight line at powercruise (or leach highway) then go a T04Z or if you want to be quick at the track, street and motorkhanas while still having a very quick car get a GT3076R.

If you are brave have a look at a HTA3076R (some guys on SAU are convinced they are the best thing since sliced bread) or if you insist on going bigger a HTA3582R

[j3rk]

You love the T04Z vs. 35R comparison Simon!

I was going 35R Cochee and from my reading it should make 500 on a standard motor, 550 on a built ish.
Granted if you go the whole hog and port/ build for a T04Z you might get slightly better comparison.
http://i36.tinypic.com/2l8j9fc.jpg

If your definitely going to build and definitely going to run E85, go the GTX3076 as Simon mentioned, you'll get bullshit response and GTX series is proved to make the same power as GT turbo above at high boost (which you could run with a built motor + E85).
http://www.turbo-garage.com.ua/shopimg/turbo/GTX/GTX3076RandGT3076Roverlap.jpg
https://www.himni-racing.com/images/GTX3582R_comp1.JPG
If I had gone down the path of building I'd have done the above, made 500 with a GTX and had the bullshit response to boot.
On the same theory you could run the GTX3582 and have a comparable top end to a T04Z with the response of a GT3582 (well only slightly less then the GT anyway)

Precision turbos were compared to the Garrett and mostly found to be the same apart from the bearings (lower quality)... didn't read much beyond that.

[SimonR32]

http://i36.tinypic.com/2l8j9fc.jpg

You do realise that Brockas totally fucked that up... I can't find the thread but he did realise he made a mistake.

Just to give you some idea, I just grabbed my old T04Z graph and overlayed it

http://i773.photobucket.com/albums/yy15/SimonR32GTR/2l8j9fc.jpg

So yes you do loose a tiny bit below 4500rpm (10-30hp) but you smash it everywhere else.

[j3rk]

I remember he fucked it up somewhat, I didn't realize it was by that much... I stand corrected.

[Turbo2.6L]

GTX35r is perfect for a 26 with decent sized sticks in it. Wont be too laggy & will do 600hp on ethanol mix.

[Cochee]

This is what I had heard but not to sure what size cams I would need.

Also what size cams are people using to get good results with 3076?

[SimonR32]

Poncams would be a good match 260 9.15...

[Yakky Bear]

gtx30 is very similar to the same maximum output of the older gen gt35r. im with Simon a gtx30 would definatly be my pick. make decent power yet still nice and responsive.
even the gtx35r would also be a wise choice, little more lag but more up top. The gtx series turbo's seem to work extremely well with some boost into em 18+psi.

Mark on here is running a gtx35r on his stock unopened rb25 and making 470-480 rwhp from memory on pump fuel.

[Turbo2.6L]

GTX35 will surpass a TO4z in the top end & be nearly on par in the mid range as an old 3076. Awesome turbo for a street car & even for Barbs, not so great for motorkhana style events.

[caibs]

i know its a little irrelevant/off topic seeing as you guys are talking about a different motor, and different turbo, but on the topic of t04z's and precision turbos i thought some people might find this interesting.

a lad with the username sleepercorty has a 1j cressida to which he has back to back tested a t66, t04z and a journal bearing 6765.
thread with dyno sheets, track times etc. is here:

http://www.rollaclub.com/board/topic/39624-1jz-cressida-big-turbo/page__st__450

he is indeed running pretty high boost and ethanol, but it just shows that these cheap journal bearing precisions are pretty decent bang for buck. he has run quite a low 10 on that setup as well.

[esky]

6265 r32.

http://www.skylinesaustralia.com/forums/topic/381278-project-bnr32-powertune-australia-built/

[SimonR32]

There was an interesting result of one of those 6765 on SAU on a RB26, the only thing being is that he said he had 4.11 diff ratio which the speed would indicate the run on went to about 6400rpm and had already turned over. Makes it very hard to compare response when I have to assume I don't know the diff ratio, but impressive power none the less.

http://www.skylinesaustralia.com/forums/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=361588

[SimonR32]

6265 r32.

http://www.skylinesaustralia.com/forums/topic/381278-project-bnr32-powertune-australia-built/

Temperature probe fault. I would take any Powertune graph with a pinch of salt as they never have the air temp sensor connected

[Madhav]

Obviously not on an RB engine, but a useful comparison nevertheless:

6266 vs 6466 vs 6766 on a bone stock 2JZ

http://i738.photobucket.com/albums/xx26/SoundPerformance/62vs64vs67Reidscar.jpg

Keep i mind this was done on a dyno in a shop that primarily sells and promotes precision turbo. So take the numbers with a grain of salt.

[Alt_F4]

http://i82.photobucket.com/albums/j272/utopiagtr/ChrisGTRKW.jpg
EFR8374 on a 3L RB on pump, will be running more boost (aiming for 500kW) when Chris fixes some boost issues.

[Madhav]

EFR8374 on a 3L RB on pump, will be running more boost (aiming for 500kW) when Chris fixes some boost issues.

Got any plots showing boost and Rpm? Looks like the torque comes on nice and early.

[Alt_F4]

Got any plots showing boost and Rpm? Looks like the torque comes on nice and early.
Full boost by 3500rpm... about the same as my fucking R34 stock twins LOL
http://i82.photobucket.com/albums/j272/utopiagtr/ChrisGTRHigherBoostandbackpressure.jpg

[Madhav]

Thats awesome! Good power and good response.

[Sfidz]

Precision are pretty boss, below vid explains.




http://www.youtube.com/watch?v=oAqM8cCm5ts

[mxracer]

^ wat turbo is that ?? ive got the precision 6266 journal bearing .. still awaiting results thou .. figured at under 1k spare cash for cams/ better fueling / meth inj.

most of the lastest billet turbos wake up at 20psi plus ..

[Sfidz]

BC 2.8L Stroker
Precision 7175 Billet turbo
Haltech Platinum Pro ECU
Powertune intank fuel system
Plazmaman Intercooler

943hp at all four on 45psi

[Cochee]

[QUOTE=Sfidz;1017136]Precision are pretty boss, below vid explains.QUOTE]

Definitely sold.haha.

I think i will go the GTX range.
I am pretty keen on the GTX35 with the .82 T4 rear although i wonder how much response i would loose if i went the .106 Twin Scroll housing considering i have the split pulse manifold with twin wastegates?

Also if i decide i'm not happy with the housing is it as simple as just swapping to the smaller/larger one.

[Cochee]

I ended up going with the GTX3582 with the .82 rear. I looked into the gtx3076 but struggled to find much positive feedback about the apart from this thread.

Cam wise i will probably go with type B camshafts.

[Yakky Bear]

nice one mate! you will be happy.

members car running same turbo, have been in this car and is alot of fun.

<iframe width="560" height="315" src="http://www.youtube.com/embed/u6-wBRn2YX4" frameborder="0" allowfullscreen></iframe>

[Damo 69]

so as oppose to creating a new thread,

turbo selection for a RB28?

GTX35
precision 6262 or 6266
Borg Warner EFR8374

car will be used at barbagallo, and some of the smaller events i.e. midvale speed dome, RAC Centre etc.

leaning towards the precision due to cost, chasing a responsive 600whp on E85

[SimonR32]

All of those will go well over 600rwhp! If you are looking for 600rwhp maybe look at something smaller

Borg Warner should technically be the best option but
-They have had massive supply issues, people have been waiting 3 years. They always seem to be "a month" from having stock
-Early turbos had massive reliability issues (which have apparently been sorted)
-They are huge turbos, you will need to get a custom manifold to suit
-The smaller exhaust housings only come internal gated, although you should probably be looking at the 1.0 rear which comes externally gated

GTX35 and 6262 are very similar wheel sizes and should perform very similarly
-6262 are cheaper
-6262 come in T4 divided
-GTX35R now come in a genuine T3 divided but will cost you more

I'd go the PTE 6262 because it's cheap and easy or the Borg Warner because it should be better but most likely will cost you more and be more complicated.

[Madhav]

WTF autos recently fitted a EFR8374 on a 2JZ and it did extremely well, made boost very early and also good power in comparison to the usual garretts and precisions of a similar size.

See here: https://www.facebook.com/photo.php?fbid=10151400148908068&set=a.412941408067.190490.132352353067&type=1&theater

[Damo 69]

that takes a BW off the list would rather stick with an off the shelf 6boost, and fuck 3 months.

how long was the wait on the precision? i emailed the guys at powertune didnt get a response on the best suited turbo for a 2.8

based off your dyno graph i am trying to work out how much extra response will be gained with the extra 200cc and a 6262, SAU is as helpfull as a blind guide dog - too busy talking about "who has the best looking NA"
and finding back to back testing of a RB26 and RB28 i.e. same turbo same dyno to even get an indication is proving to be a bit of a challenge
.

[SimonR32]

Next person to ask me to make a split pulse manifold to put a Borg Warner EFR turbo onto a 2JZ is going to get punched. This is not easy. But seriously, despite the pain of making this turbo fit in the engine bay, I'm loving the look of the manifold!

LOL

[SimonR32]

that takes a BW off the list would rather stick with an off the shelf 6boost, and fuck 3 months.

how long was the wait on the precision? i emailed the guys at powertune didnt get a response on the best suited turbo for a 2.8

based off your dyno graph i am trying to work out how much extra response will be gained with the extra 200cc and a 6262, SAU is as helpfull as a blind guide dog - too busy talking about "who has the best looking NA"
and finding back to back testing of a RB26 and RB28 i.e. same turbo same dyno to even get an indication is proving to be a bit of a challenge
.

I got my Precision from America, less than 5 working days, if you want work out what you want I'll get a price for you :)

RB26 vs RB28 I would guess you are looking at 200-400rpm better. Don't look at the dyno graph for response because it's a lot different on the road, see below for 3rd gear loading up on the road. 1 bar at just under 4000rpm

http://i773.photobucket.com/albums/yy15/SimonR32GTR/3rdgear_zps42d4c17f.jpg (http://s773.photobucket.com/user/SimonR32GTR/media/3rdgear_zps42d4c17f.jpg.html)

[Buckas]

...1 bar at just under 400rpm

i had to read that twice. as you were

[SimonR32]

i had to read that twice. as you were

haha woops typo, fixed to 4000 now

[Damo 69]

thats fairly awesome, what data logger is that?

[Cochee]

that takes a BW off the list would rather stick with an off the shelf 6boost, and fuck 3 months.

how long was the wait on the precision? i emailed the guys at powertune didnt get a response on the best suited turbo for a 2.8

based off your dyno graph i am trying to work out how much extra response will be gained with the extra 200cc and a 6262, SAU is as helpfull as a blind guide dog - too busy talking about "who has the best looking NA"
and finding back to back testing of a RB26 and RB28 i.e. same turbo same dyno to even get an indication is proving to be a bit of a challenge
.

Josh is doing your build?

Mine was on the dyno last night and today. 2.8 with the GTX35.
Early reports are pretty good and I will hopefully be able to put a graph up for you this afternoon.

[Damo 69]

Josh is doing your build?

Mine was on the dyno last night and today. 2.8 with the GTX35.
Early reports are pretty good and I will hopefully be able to put a graph up for you this afternoon.

yeah he is, i was just chatting to him about something else.............................................. ....he told me i will need a bigger clutch after getting yours off the dyno.

very similar build, without the exceptional detail you went to on every aspect of your car.

[SimonR32]

thats fairly awesome, what data logger is that?

Vipec on board

[Aleo24]

Ive got the 6262 on my stocko 2jzgte. Getting full boost 22psi at 4000rpm in 3rd on the freeway with pump 98. Exhaust manifold is home job, unequal length so wouldnt be promoting spool. For the price you cant really go past them.

[Damo 69]

Ive got the 6262 on my stocko 2jzgte. Getting full boost 22psi at 4000rpm in 3rd on the freeway with pump 98. Exhaust manifold is home job, unequal length so wouldnt be promoting spool. For the price you cant really go past them.

Does it run out of puff up top? You got a graph?

[caibs]

aleo have you run it down the track ?

[Aleo24]

Does it run out of puff up top? You got a graph?

This is my old tune from hyperdrive

http://i1189.photobucket.com/albums/z430/Aleo24/DYNO_zps11391d41.jpg (http://s1189.photobucket.com/user/Aleo24/media/DYNO_zps11391d41.jpg.html)

This is my current tune that i did myself

HP vs AFR
http://i1189.photobucket.com/albums/z430/Aleo24/456HP-ALEX02_zps2621b22c.jpg (http://s1189.photobucket.com/user/Aleo24/media/456HP-ALEX02_zps2621b22c.jpg.html)


Torque vs boost
http://i1189.photobucket.com/albums/z430/Aleo24/456HP-ALEX01_zps411be3b2.jpg (http://s1189.photobucket.com/user/Aleo24/media/456HP-ALEX01_zps411be3b2.jpg.html)

Dont think they load the car up properly on dyno's as they always seem laggy on the graphs. On street logging i can get full boost at 4000rpm in 3rd gear. 4th is pretty similar. not game to try 5th on the street.


aleo have you run it down the track ?

Been to the drags a couple times, 12.7 at 118mph was my best on street tires. 12.2 was the best i can manage on Et streets but i was missing gears due to a clutch problem i still havent sorted.