Precision Billet Turbos

[Piggaz]

Very nice, on E85 I assume? Why bother with the -5s?

Because the last tune was close to 430 RWKW. Different head and a few different mods I wanna see what these little things can do. They should crack 450 without too much trouble.

[GTScotT]

What - why?? PT6766 would be the smallest I'd put on one of those, there is someone running around with an FP GT3794HTA on one and it sounds awesome. They just need to wind up the boost and supporting mods a bit to justify it more.

6766 is massive lol nearly a kilo of ponies man, what the fek haha

Any idea where to find the sheet for said HTA Failcon? I am considering a barra swap into something atm

[jet_r31]

a 6766 is tiny on a 4.0 motor...you woudn't want to go to much smaller

[GTScotT]

wait where was ford on this one? they come stock with a 3576 nowadays.

you guys are jokers lol

[Johnny_B]

i messaged DLM regarding whether the 6262 or 6266 was the best choice for my motor setup

ive been chasing information on the precision 62 series turbos on an rb25/30 and thought you may be able to shed some light.

my engine is as follows:

r33 rb25 head vct removed

272 9.3mm lift cams

8000rpm limit

rb30 bottom end

forged pistons & rods

9:1 compression

rb26 itb's adapted to the rb25 head

98 octane fuel z32 afm and apexi powerfc

the car is used for drift, drag, circuit motorkhana basically everything so response is a huge factor.

im told a garrett 3540 will spool somewhere around the 3500-4000 rpm mark and thats what id like or better from a precision unit.

i currently have a standard rb25 gearset in my gearbox that will be upgraded 1st-3rd dog box in the future so for now im chasing power around the 330-350kw mark, with hopefully enough scope in the turbo to change to e85 later and chase 400kw.

from my research and understanding the two units im looking at are either the 6262 or 6266 with the .84 rear housing.

how much laggier would a 6266 be over the 6262? when could i be expecting the turbo to be on song?

any information would be great.

thanks john

and their reply was as follows:

Hey John,

A perfect street and strip combination would be the 6266 for your RB25/30 and the combination you have forwarded below, this will spool relatively early start around 1800-2000 and give you substantial boost by 3000-3500 rpm! This turbo will produce 750+hp on full song and for pump fuel if you set up the gate properly or run some Methonol injection kit you will have full boost by 3000rpm!

I hope the above info is helpful, I have the ball bearing billet comp wheel and aluminum backplate, ported S cover in stock, with both .84 split pulse & .82 v-band in and out options for your consideration.

Regards

Spiro

DLM

they are some pretty unreal claims they are making, i will be buying a bb6266 in the coming months once my motor is built and see what it will actually make and the spool times. will probably get the tuner to do some big power runs to see what its capable of making then pull it right back to save my gearbox untill i can afford a dog box

[rondofj]

From Real Street's ebay website:

http://www.ebay.com/itm/Precision-5558-Journal-Bearing-Billet-CEA-55mm-Turbo-T3-T4-SP-V-Band-63-A-R-/290672655598?pt=Motors_Car_Truck_Parts_Accessories&hash=item43ad70bcee&vxp=mtr

scrolling down to the bottom right - the sign in red says, 'due to the huge influx of sales from their billet line of turbos, there is currently a lead time of 2-4 weeks before shipping of any Precision turbo'..

Think this applies to most sellers..long huh!

Edited September 6, 2012 by rondofj

[SRS13]

I'm going to purchase a 5858 SP T3 0.63 v-band Ball Bearing for my SR20.

Spoke to Yavuz and luckily he agreed it was the way to go with the T3 manifold "for me", although he did speak highly of the T4 twin scroll set-ups.

Am going to order in the next week or so.

[GTScotT]

What made him believe it was 'for you'? Can you tell me more about this decision?? I have a T3 highmount setup SR also

[methz]

correct expect to wait around a month or more for your turbo, friend ordered 6266 and his took about 6 weeks roughly from date of purchase.

[SRS13]

What made him believe it was 'for you'? Can you tell me more about this decision?? I have a T3 highmount setup SR also

Mainly the power goals I have with the expected level of response, all on E85.

1. I want to make around 300rwk on approx 16-18psi
   
2. I want to make around 320rwk on approx 20-22psi
   
3. I want to make 350rwk++ on approx 25+psi
   
4. I want full boost (boost level as defined above for each power goal) between 3900 to 4500rpm
   

To achieve that;

• The 5858 will be slightly laggier than the 5558 but will make more power.
  
• A 5558 will have better response and make 320rkw but may need higher boost levels to achieve it - something I cant quite do yet on a standard bottom end.
  
• A 5862 or 6266 will easily make that but we believe they may be too laggy for a T3 undivided set up.
  
• The 5858 is a middle of the ground compromise.
  

Another reason is I'm making close to 270rwk now out of a 3071 T2 on around 22psi so I don't want to upgrade to a 5558 and make 300rwk on 22psi (it should make more but I don't want to risk it) - I want the next turbo to make a BIG difference to power.

BTW my car will be running 295 semi slick tyres all around and is essentially a dedicated circuit car hence the power goals. I dont want power so I can say I have xxrwk - it will be needed and used on the track, particularly Eastern Creek.

Ultimately when the time comes (built motor) we will turn it up and try to hit 350rwk++ so the extra compressor size of the 5858 will give us that extra headway, may even be too small!!!

That's the logic (?) but will find out when it all happens I guess.

Edited September 7, 2012 by SRS13

[GTScotT]

full boost between 3900 and 4500 is pretty good expectation TBH, especially for the power goals.

What did he say it would be like getting onto boost? and are these figures on 98 or E85?

BTW do you want to sell your 3071?

[rondofj]

Ron - errr Jase, are you getting a kando, precision or 3071? lol.. I was gona change my mind (yes - again... ) after you mentioned the 5858 when I ALMOST bought the 5558, then after some frantic searches I came across a picture of a 5858 beside a 3076R, the 5858 is much bigger physically than a 3076R judging from pics - I said fark this aint fitting on my stock mani without clashes, I will stick to the 5558... LOL

[SRS13]

^^^ Ron: please post the pic of the 5858 next to the 3076. Although in my case it will be top mounted so not much of an issue.

All on E85.

Yeah 3900rpm is to hit 16-18psi and 4500rpm to hit 25+ and somewhere in between for 20-22psi. Those numbers based on DRE20's car running the same turbo seem doable. His hits 21psi by around 4100rpm (from memory) and goes on to make 304rwk on 98 pump. E85 brings it on a lot earlier so my numbers should be achievable(?). Only difference is his engine is overbored to 90mm so essentially 2.1ltr which does help response.

I will sell my 3071 but not sure when. But was going to try and sell as a kit with GKtech manifold, intake pipe, filter and dump pipe. I assume you only want the turbo to change the rear end to T3?

Edit: sorry without having tried one, he said it should be all in by 4500rpm which is a little late by my liking but like you said to make those numbers with a 2.0 DET your going to have to sacrifice some response. That's where diff ratio (4:3's), cam gear adjustment, throttle response and tuning all come into it.

Edited September 7, 2012 by SRS13

[GTScotT]

Ron - errr Jase, are you getting a kando, precision or 3071? lol.. I was gona change my mind (yes - again... ) after you mentioned the 5858 when I ALMOST bought the 5558, then after some frantic searches I came across a picture of a 5858 beside a 3076R, the 5858 is much bigger physically than a 3076R judging from pics - I said fark this aint fitting on my stock mani without clashes, I will stick to the 5558... LOL

I hope you realise the 5558 and 5858 are physically the same size... its the wheels that are different (internal parts).

LOL sorry to bust your dreams man...

To SRS13: it still sounds reasonable, but the 5558 would probably be the better choice for me. I am trying to get the thing on full song by 4k and am a simple 86.5mm build. I do have the cams and a 6boost so my setup should work well... but im just worried the turbo itself is too big. If I did want your 3071 I would be chasing it just to change the rear housing to a T3 and use it on my setup, yeah.

[rondofj]

Although its too late now, I would still go a 5558 over a 5858 if I needed to buy again, as I do want every bit of response I can get in..

[SRS13]

I've sent a couple of emails to Precision US direct and they advised the following for SR20 which I guess can be applied to any engine;

• 5558 will come on a few hundred rpm quicker than the 5858 due to the larger compressor in the 5858
  
• The 5858 will make more power on lower boost
  
• The 5862 will be between 400-500rpm laggier than the 5858 but make 20-30peak horsepower
  
• The 5858 in their opinion will be the best option to make the horsepower I want
  
• The journal bearing and ball bearing units make the SAME horsepower
  
• The ball bearing units will come on 200-300rpm sooner than the journal bearing - hence better curve
  
• The ball bearing units have better transient response
  

As I am putting mine on a circuit car, boost response and transient response mean a lot hence I am getting a ball bearing 5858. If it were only a street car or even drag car I would go with a journal bearing as peak power potential is the same.

[SRS13]

To SRS13: it still sounds reasonable, but the 5558 would probably be the better choice for me. I am trying to get the thing on full song by 4k and am a simple 86.5mm build. I do have the cams and a 6boost so my setup should work well... but im just worried the turbo itself is too big. If I did want your 3071 I would be chasing it just to change the rear housing to a T3 and use it on my setup, yeah.

My thoughts: if I were you and response and good but not big power is most important ie around 280rwk or so, I would go with a Garrett 3071R T3 with 'proper' 60mm wheel. It will be all in by 4000rpm and make between 260-300rwk depending on boost - see Badhairdave's car as a great example.

Next would be the TD06SL2-20G 8cm, that seems to make numbers anywhere from 270-300rwk but is journal bearing so once again response and transient response probably wont be as good as BB 3071r (assumption) but it will still be more responsive (based on wheels sizes) than a 5558.

Last option would be 5558 journal bearing or ball bearing. This will be IMO laggier than the above two but will make more peak power than both.

Just have to work out what you plan to use your car for and what you want.

Hope that helps!

[GTScotT]

Thanks mate, appreciate the input.

I agree with your thoughts mostly, yet wheel design wise I think the TD06SL2 20g would be more responsive than the 3071. The 3071 I think are a heavier rotating assy which needs more energy to drive, so the 20g is more of a winner there.

What continually makes me reconsider my original plan of the 20g is two things: 1 people keep telling me to go a 3071, and despite my own strong opinions I can be a little bit of a sheep. 2 I am worried I will end up wanting MOAR and being stuck with a fairly low ceiling with either of the above, hence considering the PT.

Ive still got time to decide as im still part way through building my block, but changes are the little 20g will be it. If nobody else can sway me that is haha. Look forward to your results.

[rondofj]

What is the general power threshold of these tractor sr20s before they go boom? ie RB25, say around 280-300/320rwkw according to SAU sources.

Wonder how the tractor engines compare to the EVO 4G63 tractors.. 2L four vs 2L four..

[SRS13]

What continually makes me reconsider my original plan of the 20g is two things: 1 people keep telling me to go a 3071, and despite my own strong opinions I can be a little bit of a sheep. 2 I am worried I will end up wanting MOAR and being stuck with a fairly low ceiling with either of the above, hence considering the PT.

And that is why I am going the 5858 over the 5558.

I was never ever going to consider the 3071 T3, just wouldn't make enough and the TD06 I feel is the same but more of an unknown quantity. So it came down to 5558 and 5858 and in the end I felt the 5858 was best - hopefully reasonable response but good power should I want it and who eventually doesn't?? Also helped that Yavuz, Precision US and ST8E180 also thought this was the best way to go.

Good luck with it!