6765 Precision Turbos? On Rb30

[cribba]

hi im just upgrading my gt35r on my rb26/30. im looking into the 6765 precision turbo, i like the specs of the turbo and its great the fact i dont have to change to a t4 flange. ive heard a lot of good things about these turbos. has anyone used these on an rb30 and can give some feedback on housings and so forth? im aiming round the 700hp with not having a big lag monster i think will be ideal. any ideas are welcome thanks?

Edited May 27, 2011 by cribba

[paulr33]

whats wrong with the 35r

[HYPED6]

I have seen, in person, not just heard about 35R's being just out of puff at over 400rwkw for extended periods of use.

Now, I love the turbo. I still believe that a 35R is the perfect balance between response and reasonable power output.

What I also believe is that when pushed for extended periods at power levels at above 400rwkw a 66mm compressor turbo is a better choice.

Its not that the 35R cant do it, its that you have to really push the turbo to do it for extended periods.

Now, 400rwkw means= 400rwkw on a dyno dynamics dyno, in the correct shootout mode, in this case 6F with the air temp sensor hanging up on the wall not in the engine bay.

EGT's also under 800C normally 750C just to ensure the longevity of the turbo. The correct fuel used for the application.

I could easily make 450rwkw on the dyno with air temp in the engine bay and in some random ramp rate but thats hardly comparing apples with apples.

[paulr33]

but on the street what wins?

what you make in shootout mode or what has more average power?

[HYPED6]

I havent done back to back on a 6765 but I can tell youi that a 37-88 is a much better setup for over 400rwkw, Has almost (within 300rpm) the same responce as a 35 with .8 rear.

I have even tried a plain bearing 66mm with a .64 T4 rear housing. Tiny litle bit more lag than a 35r with .8 on a 26 but has the scope for 450rwkw.

For under 400rwkw the 35 is a perfect turbo

[mico]

is that you chris ? its mic mate. hows the 31 ? u want more power already haha, how bout a gtx 37 ?? they are t4 rear and not too big for a 3ltr.

edit, ah so u want to keep the t3. gt35x ?

Edited May 28, 2011 by mico

[cribba]

hey mic, wats crackin mate? yeah i want more mate, its worse than drugs this stuff. im keen on these precisions just cant find enough info on them. i sold my35r so gotta buy something else now. hows the gtr comming along?

[cribba]

hey guys there was nothing wrong with the 35r dont get wrong it was a great turbo. but i no if i kept pushing it too what it was going it might do damage. thought i would upgrade to something a little larger and not work it as hard. i was pushin out round the 400kw. good power for that turbo. i am thirsty for a little power and have something reliable. it doesnt get driven on the street much now more a track car. does anyone no the exducer size of the compressor wheel on a 6765? i heard there the same size as a to4z just want to double check?

[cribba]

hey guys, look theres nothing wrong with the 35r, i was more than happy with it. but i didnt want it to let go pushing it all the time. i was making round 400kw. i would like to get something a little larger and not push it as hard. the car doesnt get driven on the street much anymore, more a track car. does anyone no the exducer size of the compressor wheel on a 6765? i heard they are the same as a t04z just wanted to double check? thanks for help

[mico]

yeah its good mate still waiting on parts tho seriously tho is the gtx too expensive ?? its got another 150hp over the one u have, and will bolt straight on to your existing dump, mani, oil/water lines intake etc etc. by the time u modify everythin to fit the precision u will probably have spent the same.

[N1GTR]

You can get a 66mm wheel on a 35R, ring GCG

[NYTSKY]

I have seen a 66mm 35r fart out 430rwkw on pump.

This was on an rb25/30. With E85 mid to high 400s would be easy not to mention the torque gain.

[black bnr32]

6765 on a 3L us-spec S50 BMW

http://forums.bimmer...34&d=1306267312

http://forums.bimmerforums.com/forum/showthread.php?t=1658765

or

http://store.forcedp...y_Code=Turbo-FP

Edited May 29, 2011 by black bnr32

[HYPED6]

I like the look of the 3794.

[cribba]

thanks bnr32. that could be a good option the 3794. looks mean. big front wheel. looks like they got good figures out of the bmw to with the precision. i wonder how much lagier the 3794 would be with the larger turbine wheel, compared to the 6765?

[cribba]

thanks to mico, found the spec on the wheels of the 6765. compessor wheel 65mm inducer 87.5mm exducer. turbine wheel- 74mm inducer 65mm exducer. similiar specs to a to4z. should come on boost similiar to the 35r id say

[Ryan1200]

thanks to mico, found the spec on the wheels of the 6765. compessor wheel 65mm inducer 87.5mm exducer. turbine wheel- 74mm inducer 65mm exducer. similiar specs to a to4z. should come on boost similiar to the 35r id say

67mm compressor inducer.

I have a 6765 in the forsale section atm although its a T4 version so not much good in this situation.. From my research this turbo will be a far bit lazier than a 35R it will be comparable to a t04z and make GT4294 power.. If mine doesnt sell shortly ill have some results to post up in the next month or so. Will be able to compare my old twin hks 2530's setup on a built 2.6 to 6765 .81 6boost T4 open manifold..

[Lithium]

The PT6765 is quite a bit laggier than a GT35R, they're more comparable with a T04Z. Even the smaller Precision PT6262 is laggier than a GT35R, though would also be a bit of an upgrade.

The GT3794R seem like an awesome piece of work though is again laggier than GT3582R, would be my pick of the bunch though

[black bnr32]

you can probably find 3794 and 6765 comparisons on evolutionm.net

[cribba]

67mm compressor inducer.

I have a 6765 in the forsale section atm although its a T4 version so not much good in this situation.. From my research this turbo will be a far bit lazier than a 35R it will be comparable to a t04z and make GT4294 power.. If mine doesnt sell shortly ill have some results to post up in the next month or so. Will be able to compare my old twin hks 2530's setup on a built 2.6 to 6765 .81 6boost T4 open manifold..

that sounds great mate, good luck with yours