Pu High Flowed R33 Turbocharger. 295rwkws @18psi. Steady Boost Control With .63 Rear

[Pattygtst]

Is there any reason for the lack of response. 4100rpm on a 0.63 housing isnt what i would expect.

[hypergear]

Well like I said its got a different wheel for greater flow instead of response.

I'll be driving this car for a while before I would be comfortably building it for any one in case of any problems. If this works out well we will be able to do that to all OP6 turbine housings.

For the time been we will still be carry with standard and .82 rear ended PU high flows.

[clip14]

i would assume either back cut wheels and/or porting and/or a large compressor wheel

[GTScotT]

i think the result is impressive and on par with alot of 3076 results.

its making nearly 200kw at the 4000rpm mark which is well and truly on par, and it ramps on nice. considering the final output is also near enough to 300kw, for something that will bolt on and be very close to stock like appearance, i think we have a few too many whingers in this thread.

please take note of my reference to the words 'i think' and note that it is my personal opinion that you are whingers, to which i am entitled

lets not forget the value either!

[joeyjoejoejuniorshabadoo]

LOL! this power is unbeliaable guys. Soon this turbo will be on mine! Guys Tao took me for a drive in this with the turbo on and it was just AMAZING! it was so torquay!!!!!!!!!!!!!!!!

sure it wasn't queenscliff?

[ssxRicho]

sure it wasn't queenscliff?

boom shysh

[SimonR32]

I've changed the wastegate controller's design. Its got lot better adjustability now.

Can you elaborate? I wouldn't mind improving mine if possible

[Hanaldo]

sure it wasn't queenscliff?

Lol, beat me to it

[Dr_Drift]

Another Dr-Drift dyno run cut off early...rev it harder Sam

They are still nosing over after 5500 though stao...badly

Stao's rear tires are not the 'grippiest' and we have been fully booked out... I was just doing him a favour and squeezing in a few runs to see if we could monitor and control boost. If this was a full tune we would have certainly strapped it in, played with with cam timing, etc etc...

ok fair enough then

As said about though, it does look a little lazy coming onto boost..but that could just be the ramp rate aswel.

Ramp of 13kph/s

Awesome results, but i'm really concerned about the manifold pressures. I want to know if you guys are monitoring the manifold pressures whilst holding the gate closed with the actuator stopper? im worried about excessive pressure doing damage long term (exhaust valves and rear turbine).

Agreed, I've had many discussions with Stao regarding going beyond what I recommend, and to his credit he's prepared to push the limit, learn along the way, and try new ideas. I would certainly not recommend anyone to push these turbos, or any turbo to their limits, without carefull monitoring and understanding of vitals.

Sam.

[hypergear]

This version of PU high flow plus the SS-2 prototype is an example of pushing few factors to its limit in exchange for the most out standing response, and power.

First time you've ever seen 295rwkws with .63 turbine housing holding straight 18psi to red line with internal gate, or 250rwkws with 18psi < 2500RPM of a SS-2 right?

Experience, Materials, workmanship, knowledge, data, and engineering define certain extension of limit. There are no full definition of limits, and nothing is physically impossible. So we'll keep cracking.

Also we've done lots of researches and evaluations in parts and components that made up those 2x turbos that takes the edge. I will evaluate it for 100,000KMs with some data analyse. If every thing turns out in great order as expected then I will have no holding back and let our customers enjoy the benefit of the new concepts.

[tridentt150v]

sure it wasn't queenscliff?

I thought he meant to gay

[Kinkstaah]

wtb, that is all

[joeyjoejoejuniorshabadoo]

First time you've ever seen 295rwkws with .63 turbine housing holding straight 18psi to red line with internal gate

bombtrack got 297 with an I/G hks 2835 (.68) with drop in cams on an unopened RB25 on pulp on the chasers dyno... that's pretty close

[kwickr33]

First of all Good work.

I've personally seen this turbo before it was installed. Since Stao does not want to reveal the wheel sizes, its a 500HP rated CHRA in a .63 turbine housing. Which we've also seen Garrett GT3582 600HP CHRA in .63 turbines.

The exhaust manifold pressure and flow keeps the shaft spinning providing desired boost level. Any lose of exhaust manifold pressure or flow will result in boost drop. So wither you run a adjustable internal gate or an external gate, at 20psi the manifold pressure does not change.

If the components of the turbo is built to handle 20psi with decent tune then I don't believe it would cause any problems.

Edited May 19, 2010 by kwickr33

[zebra]

Pressure and flow are two different things altogether, The less exhaust manifold pressure the better.

As pressure builds up it fights against the spinning turbine wheel causing it to slow, hence boost drop off and high temps

[SimonR32]

The exhaust manifold pressure and flow keeps the shaft spinning providing desired boost level. Any lose of exhaust manifold pressure or flow will result in boost drop. So wither you run a adjustable internal gate or an external gate, at 20psi the manifold pressure does not change.

They are not talking about a drop in exhaust manifold pressure (that is what a wastegate effectively does to hold a consistent boost level). They are discussing too high exhaust manifold pressure caused by restricting the wastegate movement

Pressure and flow are two different things altogether, The less exhaust manifold pressure the better.

As pressure builds up it fights against the spinning turbine wheel causing it to slow, hence boost drop off and high temps

Actually as pressure builds in the exhaust manifold it pushes the turbine wheel faster and harder (this is why if we run a turbo without a exhaust manifold pressure release aka wastegate then turbos will run almost unlimited boost)... It also pushes harder back on the engine which is what is causing some people concern.

[zebra]

Actually as pressure builds in the exhaust manifold it pushes the turbine wheel faster and harder (this is why if we run a turbo without a exhaust manifold pressure release aka wastegate then turbos will run almost unlimited boost)... It also pushes harder back on the engine which is what is causing some people concern.

I know what you are saying there, but if the pressure cant escape fast enough (too much pressure in the turbine hosuing itself) than it will slow, due to the exhaust gas almost coming to a standstill because it has no where to go.

Which comes down to the turbine exducer sizing, dump pipes, wheel trims etc.

[scotty nm35]

I cant see the exhaust gas coming to a standstill, it would be near supersonic. I see it as maximizing the turbo as the turbine will be at its maximum shaft speed. Yes it would be better to go to a larger housing but you pay the penalty of lag and that affects the best part of the powerband. How often are you at 7000 revs anyway?

So how much pressure is too much and how do you measure it? Perhaps it is good when the stock wastegates drop boost.

[zebra]

Most people say 2:1 is bad E.g 15psi in the intake and 30psi in the exhaust manifold.

[Lithium]

Yeah you can't see what the back pressure is doing by looking at a dyno plot - sometimes it can show up as the power falling over prematurely due to the tuner having to pull timing to avoid detonation before MBT. Funnily enough this dyno plot looks like what you could expect to see in that case, if it weren't for the claim that the early drop off is due to wheelspin. Silly rolling road dynos...

Will be interesting to see how it goes on a hub dyno, and how the engine/turbo lasts at that power level if its going to be used on the track at the power level at all?

At face value, very nice power level and spool for a convenient and affordable package

Didn't Mafia make over 300wkw with a .63a/r GT3076R?