yup just grab the 6765 dbb like i did, cant wait till this deployments over to put everything togeather. i gotta pay sasha the rest of the money on the 14th =/

 

I should be back home next week, and will begin packaging it all up for you. I am excided about this build, because it is the largest turbine option I have sold so far (T4 .96 a/r) so it will flow plenty.

There is alos a 6768 T4 .96 a/r but I don't think a 3mm larger turbine wheel will make all that much difference. I also plan on seeing how the H compressor cover will work with the ST kit. It is a bit larger than the S...so there is no way to tell how it will work out. If it does work, and I am happy with the clearances, we can start looking at thing like this:

http://www.precisionturbo.net/Street...r---PT8847/287

 

lol that looks like fun, although ill prob keep the 6765 i still wanna have a semi resonable power band =P im actually thinking of going for a basic built block mayby upgrade to carillo rods instead of eagles instead of the sleeves like i was. to find the limit of stock sleeves ill prob have to max the 6765 or close to it on our engine and add nitrous on top of it which i dont plan on doing. im thinking ceramic coated headers, turbo blanket, header wrap, and the dbb will give me some nice spool. plus the dbb and going with stage 2 intake cams and stage 3 exhuast should help my overall powerband a little bit.

 

hey I have been watching your threads every since you started building the first ST kit. It inspired me so I copied your idea and build a kit of my own, also I build the engine In my basement.

I dont have a fancy tig welder like you , so I had to manage using mild steel tubing and a MIG. I am using a Holset HX40 turbo from commins 5.9l diesel engine. I wanted to know how bid is the 6765 or even a gt42 compared to the HX40.

Currently I made 415whp @9.5 psi of boost.
I am planing on changing up a few things about the turbo kit in the next month or two and was planning to get a better turbo. What is your opinion , is the 6765 bigger or smaller than my current hx40

Here is a few pics of the turbo

 

what is the compressor and turbine wheel size on the hx40? I've seen a few and i think they are smaller than my 6765 but i've never taken measurements. Looks can be deceiving.

what are your intake temps? a larger intake on that cold side could probably help out the flow of your turbo quite a bit.

 

i think the holset hx40s are 60mm. but i've also seen them listed at 53mm.
http://baeturbosystems.com/hx40hx40w-2.aspx

its def much smaller than a 67mm. At least the wheels. physical dimensions, who knows.

 

HX40 58mm 8 Blade - 60 lb/min
HX40 60mm 6/7 Blade - 69 lb/min
this is what I found out. I think the one I have is the 8 blade , but I have to check.
Not sure what the temps are , I have to look at my log , which is on my other computer.

As far as the intake , the turbo has 4" inlet , In the above pic I have a 4"to3" reducer with a 90* bend. I have removed the intake all together, Installed a screen on the turbo and made a skid plate that covers the turbo.


do you think If I upgrade to a T67,gt40 or a 6765 It would give me more power at the same boost pressure?

 

The 67mm PTE turbo is rated to flow 90lb/min according to Precision. From what I have seen the 6765 has outperformed the GT4088, but will be close to the gt4094, as I think the wheel is 68mm. I will try to find a dyno that I saw a while ago, with a direct comparison.

Also, I am able to fit a full 3.5" intake on the turbo and run it with an air filter beside the starter. You have to use a 4.0" to 3.5", 90deg silicone reducer, and you are set. Figured people have 3.5" down pipes, why not have a 3.5" intake.


EDIT: Note that the GT4088 was BB and 6765 was JB.


Do note that nobody has maxed out the 6765 on the VQ and a fully built engine, with cams. I think it has a lot more in it than 600whp on the DJ considering the GT35r with a 61.7mm wheel has put down that much with the Momentum kit with pump gas. Then there is also the 6768 and it has the 68mm turbine wheel which is rated to flow even more. So if you are shooting for maximum power, I would suggest 6765 with a T4 .96 a/r housing.


Post some more picks if you can.

 

i'm actually surprised how laggy that HX40 is to begin with. add 300 more rpm and you can make well over 1000whp with a TT kit with the same <4800 rpm spool.

 

its a 5.9l diesel turbo, so it gets a lil laggy, but i think I get full boost below 3500rpm on 3rd and 4th gear

I'm not looking for some crazy HP numbers, I'm looking to get a good spooling turbo that will make more power at similar boost levels.
My goal is 550-600 hp on a high boost map, and what ever 9psi can get me as my low boost

 

I have a build thread over at another forum, I cant seam to find more pics of the turbo on my photobucket will have to digg through my HDD , if you want i'll post the link to the thread

 

Sure, post a link.

EDIT:

Found it: http://g35nyc.com/forums/showthread.php?t=37750

 

http://g35nyc.com/forums/showthread.php?t=37750

what would be the difference between 6765s t3 .63a/r and 6765s t4 .96ar??? besides flange, would the size be similar ? spool difference ?

 

If you are looking/concerned about spool then you can forget about 600whp with a single turbo. Also, stay away from anything T3 if you wish to reach that goal. T3 .63 vs T4 .96 is a huge difference. Just remember that whatever goes in to the engine from the compressor, has to go out through the turbine. If the turbine is small, there won't be much flow, and you will not reach your goal.

 

I'm not concerned about the spool too much, I drive off boost most of the time. I love how a big single turbo car drives, I had a chance to drive a fiends STI on 35R and lowed the sudden rush of power once it spooled up. I did consider twins and was planing to fabricate something using 300zx manifolds.
My goal is to get to 600hp and if I could improve spool time it would be a plus, if not than no biggie. I know that the HX40 most likely will not get me to my goal there fore I'm looking for an alternative.

Also what do you guys think would be the max HP I can get out of the HX40? I can find the compressor map, I just dont know how too read them very well

 

I have been DIEING to try a custom PTE7675CEA set up! If you could get the H cover to fit, i would definitely be buying a kit in the future

 

konrad, can you start a thread here about your car we can use to discuss your questions?

real quick: going from a t4 .68 a/r turbine to a .81 a/r on the same size flange (t4) i saw CONSIDERABLE different in backpressure with only about 100 rpm of spool loss. Truthfully the t4 with .68 a/r is too small for our engines in respect to a single turbo.

With those sizes given it looks like the hx40 you have would be in the ballpark for size as a gt35r which is used on a powerlab kit. Those have been maxing out just below 500hp on our engines. I assume this is due to the flow issue. you can't compare them directly, but if you were to say what could be the closest thing to compare to the gt35r would be "ballpark". many other factors are involved though.

to get into the 600hp range you would need something near a 6765 or gt40. Even then there are considerable supporting mods to get 600hp on a pumpgas map. Based on my street tuning after my 13psi dyno i would say mine might be getting "close" to that 600hp mark now that i have it tuned up to 18psi on a 6765. It will be a few weeks before i am comfortable to take it and do some dyno pulls though.

 

all you need is a forward facing manifold and put it right below either headlight. or in the rear where the stock muffler was.

wont fit where BP has his mounted.

 

When I see a 6768 T4 .96 a/r maxed out, I will find a way to fit a larger turbo.

 

Yea str8, if i did one it would be a rear mount set up with a divided housing and a quick spool valve.