stpacura

I have this precision turbo for my build which I just got. I would like to know if any of you guys have had experience before with this particular turbo. I'm open to all input I could get whether is good or bad let me have it.(did you liked it, how much horses you got out of it, did it disappointed you and in what way, at what rage did it started boosting, at what rage this you get full boost etc.

specs:
.75 a/r in the front.
.81 a/r in the back hot side.

Exhaust Wheel
exducer is 2.542
inducer is 2.92
76 trim

Compressor Wheel
67mm
exducer is 3.31 inches
inducer is 2.62 inches

Now i'm a bit confuse the reason is someone told me that I need to get a bigger hot side like a .96 or .98 a/r because if not is going to fried my pistons due to the fact that the hot gases won't espace effectively at high rpm. This turbo is rated for 750-780 and is going onto a sleeved b20 with 9:8.1 je pistons. So what do you guys think?










Modified by stpacura at 10:56 AM 3/4/2008

TheShodan

iTrader: (14)

Please remove the covers and measure both the exhaust and compressor wheels, and please give us more information of your goals of the car. Power, boost, use, etc. this all would help us, help you.

stpacura

The specs of the turbo are:

Exhaust Wheel
exducer is 2.542
inducer is 2.92
76 trim

Compressor Wheel
67mm
exducer is 3.31 inches
inducer is 2.62 inches

The engine
Ls/vtec
b18 sleeved(darton) bore out to 84mm.
eagle crank, crower rods or eagle rods big bolts(have both help choose), je 9:8.1 compretion pistons
Type R oil pump

B16 head
PnP
skunk2 pro-series intake manifold with 68mm throttle body
skunk2 dual spring & titanium retainer
type R cams with factory cams gear(I have aem tru-time cam gear but I don't want the crap to become loose and skip timing)
performance fuel rail with 1000cc injectors
Aero fuel pressure regulator
Thinking on going with rev-hard turbo manifold(help)

Engine Management
hondata s300 with p28

I wan to run like 30psi of boost to start with but my goal is like 700+ horses.
What can you ppl tell me or advice me on.
this is my first turbo build by the way
help.

TheShodan

iTrader: (14)

This is a T4/T67 precision turbo using a .81A/R. It CAN get close to the 700whp mark, but the problem isn't JUST the A/R of the turbine housing, it is the wheel itself with that housing, and the fact that the backpressure may seriously prevent getting better power out of the turbo. If you do use it, make sure you take care to check your intake temperature readings after 28psi. For some reason, (mainly the design as compared to other turbos from the BW camp) the 67mm Garrett wheel does not like to get pushed past about 32psi. IATs then get nasty. If you want 700+ without blinking, the S372 is a proven winner.

Turbocivic94

I used similar turbo except the H cover, I made 630whp@23 psi. You should be fine with this turbo. It will make 700whp with no problem. You should be able to make 750whp with that turbo.

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbocivic94 &raquo;</TD></TR><TR><TD CLASS="quote">I used similar turbo except the H cover, I made 630whp@23 psi. You should be fine with this turbo. It will make 700whp with no problem. You should be able to make 750whp with that turbo.</TD></TR></TABLE>

In your situation you were only at 23psi of boost. Again, close 700whp is pushing it. You have to account for the additional heat that over 8 additional psi gives at that cfm, especially with that exhaust wheel.

Adriano

I have the same turbo but with a .68 housing. My car made 670whp@30psi. I seen them make ~700whp and 737whp once.

Adriano

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Adriano &raquo;</TD></TR><TR><TD CLASS="quote">I have the same turbo but with a .68 housing. My car made 670whp@30psi. I seen them make ~700whp and 737whp once.

Adriano</TD></TR></TABLE>

That's fine. I never said it couldn't do it, I simply said it wasn't advisable. Call me conservative when other options are available. On the dyno with optimal conditions on ONE pull is one thing, the consistency is another.

He has the turbo, let him try it out and see he likes it..

blinx9900

im not a bw bandwagoner as i have a GT30r but i would have gone with a bw turbo instead of a precision anyday. good luck with the set up though it should be some fun

stpacura

This is a T4/T67 precision turbo using a .81A/R. It CAN get close to the 700whp mark, but the problem isn't JUST the A/R of the turbine housing, it is the wheel itself with that housing, and the fact that the backpressure may seriously prevent getting better power out of the turbo. If you do use it, make sure you take care to check your intake temperature readings after 28psi. For some reason, (mainly the design as compared to other turbos from the BW camp) the 67mm Garrett wheel does not like to get pushed past about 32psi. IATs then get nasty. If you want 700+ without blinking, the S372 is a proven winner.

So basically even is I change the back housing the problem with the backpressure would still be there do to the wheel itself.(You basically recommend a bigger wheel on the hotside). Is the s372 a precision turbo as well?

twkdCD595

no the s372 is a borg warner, the current bandwagon unit.

maybe call precision and see what they have to say about pushing the turbo to that pressure/ power level with your setup... they will usually be very helpful and upfront when advising about their stuff. you should have probably done this before you ordered a specific unit to ensure it will best suit your needs.

stpacura

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">no the s372 is a borg warner, the current bandwagon unit.

maybe call precision and see what they have to say about pushing the turbo to that pressure/ power level with your setup... they will usually be very helpful and upfront when advising about their stuff. you should have probably done this before you ordered a specific unit to ensure it will best suit your needs.</TD></TR></TABLE>

Yeah I did call precision that how I got the spec and everything. They also said that the turbo would make the power that is rated for(750) and I gave him my engine specs as well as.

but this is the second time I hear about the backpressure problem.

Turbocivic94

That turbo has gotten James's car to run 9.61. I think you should be fine with that turbo. Put it on your car and have it tuned. You will see that turbo make 750whp.

just my opinion

stpacura

thanks for your replys ppl.
I really appreciate the help.
I'm going to stick to this one and see the outcome.

twkdCD595

from what I have read it looks like the turbo will make 700+whp mark your shooting for.

I also would NOT agree at all with the person/s who told you that you, "need to get a bigger hot side like a .96 or .98 a/r because if not is going to fried my pistons due to the fact that the hot gases won't espace effectively at high rpm." That is nonsense.

yes you could see some peak hp benefits from less backpressure but I dont think you are going to have any issue making the power you seek and without cooking any pistons. people have pushed pretty far on small housings and not had issues... for some great examples search here or better yet the evo/ dsm guys, they push ridiculous amounts of pressure through small wheels/ housings.

my 2 cents.... run it...


Modified by twkdCD595 at 2:15 PM 3/5/2008

stpacura

what can you guys tell me about the rods should I stick to the eagle big bolts rods or the crowers rods?

Turbocivic94

Eagles would work fine and crowers are also good rods...

Take your pick

stpacura

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbocivic94 &raquo;</TD></TR><TR><TD CLASS="quote">Eagles would work fine and crowers are also good rods...

Take your pick</TD></TR></TABLE>

Ok.
What do you recommend when it comes to turbo manifolds.
are rev-hard any better than ram horn or vice versa?

mint

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">no the s372 is a borg warner, the current bandwagon unit.</TD></TR></TABLE>

LOL

Turbocivic94

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stpacura &raquo;</TD></TR><TR><TD CLASS="quote">

Ok.
What do you recommend when it comes to turbo manifolds.
are rev-hard any better than ram horn or vice versa?</TD></TR></TABLE>

I would recommend Inline Pro or good company ram horn. If u can afford Top mount from reputable company then go for that. Its all what u can afford and do u want 4" downpipe.

People say that its easy to remove turbos from top mount but I had easier time with ram horn. Look at other people's setup and see what kind of manifold u like.

agrn93ls

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stpacura &raquo;</TD></TR><TR><TD CLASS="quote">I have this precision turbo for my build which I just got. I would like to know if any of you guys have had experience before with this particular turbo. I'm open to all input I could get whether is good or bad let me have it.(did you liked it, how much horses you got out of it, did it disappointed you and in what way, at what rage did it started boosting, at what rage this you get full boost etc.

specs:
.75 a/r in the front.
.81 a/r in the back hot side.

Exhaust Wheel
exducer is 2.542
inducer is 2.92
76 trim

Compressor Wheel
67mm
exducer is 3.31 inches
inducer is 2.62 inches

Now i'm a bit confuse the reason is someone told me that I need to get a bigger hot side like a .96 or .98 a/r because if not is going to fried my pistons due to the fact that the hot gases won't espace effectively at high rpm. This turbo is rated for 750-780 and is going onto a sleeved b20 with 9:8.1 je pistons. So what do you guys think?
</TD></TR></TABLE>


this thread is retarded, everyone is scaring you into thinking you dont have enough a/r on the hotside yet you have not once stated your setup or your goals, anything, f'ing stupid, not you.

that is a big exhaust housing you should be able to make alot of power without worrying about reversion ( "frying the pistons" ) if your goal is to approach the 800 mark or so then yeah you might want bigger, but if your going for around 500 you are probably well within the efficiency range and probably have a perfect suited turbo, you will know when you tune and get IAT's etc...

SPOOLINmatt

i wish they still made the damn GT4067 ...STUPID!


or the PT turbos with divded turbine housings! I think the turbo will make the power it will just take some good tuning.

stpacura

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by agrn93ls &raquo;</TD></TR><TR><TD CLASS="quote">


this thread is retarded, everyone is scaring you into thinking you dont have enough a/r on the hotside yet you have not once stated your setup or your goals, anything, f'ing stupid, not you.

that is a big exhaust housing you should be able to make alot of power without worrying about reversion ( "frying the pistons" ) if your goal is to approach the 800 mark or so then yeah you might want bigger, BUT IF YOUR GOING FOR AROUND 500 you are probably well within the efficiency range and probably have a perfect suited turbo, you will know when you tune and get IAT's etc...</TD></TR></TABLE>

My goal is for like 700 horses.

agrn93ls

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stpacura &raquo;</TD></TR><TR><TD CLASS="quote">

My goal is for like 700 horses. </TD></TR></TABLE>

then yes you may want to get a larger a/r on the turbine

twkdCD595

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by agrn93ls &raquo;</TD></TR><TR><TD CLASS="quote">

then yes you may want to get a larger a/r on the turbine</TD></TR></TABLE>

not to come off rude or anything but are you drawing this conclusion from experience, cause the .81 a/r t4 housing is not that small and will support his power goal.

just curious cause in your first reply you say this is a perfect suited turbo for 500 hp goal... which makes me think you are confused/ misread the specs on this turbo or not experienced with it. I dont think this is turbo is perfectly suited for 500... smaller units could make 500 and provide better power under the curve.

people are so quick to just say go bigger in our world here (hondas)... which I am all for big turbos but not in this case. lean on that turbo and it will make the power (of course thats given the supporting parts are up to snuff), as others have said.