kelesha

Hi guys,

I am interested how much overboost and hold boost run 996 cars with 700hp to flywheel ? Such like EVOMS 700 kit and etc ?
I read from EVOMS site that EVO600 cars run K24 turbos with 1.2 bar boost but is that peak boost(overboost) or hold boost, they don't specify.....so 700hp car need 1.4-1.5bar hold boost with suitable turbos or i am wrong ???

greetings
Tony

Gary (Fl)

Depends upon what other "plumbing" has been done and who the tuner is....
All tuners don't achieve their HP the exact same way...

Yup K24's are about toast at 1.2...

kelesha

Yes this is really true, i talk about car with performance custom headers, 2x3" exhaust without cats, custom Garrett T3/T4 turbos, managed with stock Motronic M7.8 with suitable reflash

will toast at 1.2 bar peak or hold boost ?

red993tt

Very true about tuner dependents, night and day as matter of fact.

Stock K24 maybe, but I think a tweaked K24 such as Kevin's will boost much higher depending on the fuel system.

Woodster

GT800 or beyond if GIAC is your Choice,
otherwise RUF RT12 or Protomotive package.

You are asking a tall order and will require a tall stack of $1000 bills.

Good Luck,
Marty

tkerrmd

need internal mods to get that kind of hp, not just a boost problem

Red9

Tony's question is " what boost is required to achieve 700 FWHP" . Given that all the wise head wisdom makes the point that for reliable nunbers like that needs the internals done. So I also am interested in the answer-- and what sort of spec turbo is required to achieve that.

Gary (Fl)

It's not that easy.... GIAC/EVO will run higher boost than say Protomotive to achieve the same hp... It's not just in what you crank up the boost to... But what fuel is available, air flow, intercoolers, turbos, etc....

There are many variables and you will hear different opinions as to which are better... just ask ...

PorschePhD

You could do it on .8 bar if you use one turbo compared to another. We do it on the 930s all the time. There are no free lunches though. Keep in mind it is as much about CFM as it is pressure. They go and in hand. Unfortunately a turbo that makes 700HP at .8 bar will more than likely not have ANY low end. So if you have tons of volume to create that volume you much use a large turbo.

Use a smaller turbo and it comes up quicker, it will not flow the same volume and you will need to make the volume up by adding pressure. ON average for every 3 lbs of boost you raise CR apx 1 point. The you would use a smaller turbo is to create faster movement. This is a catch 22 though. Smaller turbos pushed beyond their efficiency maps will over heat and make less power with more boost so a nice combo has to be made.

Now, the short answer....Our kits use 1.3 bar on the GT 700 kit.

markski

some guys bragged b4 that they go up to 1.5 bars.... Im assuming it was spikes.... I personally saw a gt700 running 1.2 bars constant and peaking 1.3/1.4bars. maybe a WG adjustment needed... if that.

PorschePhD

Yes, every car spikes. I might spike to 1.5, but it drops quickly and settles in to 1.3 bar.

kelesha

So i assume that for 700hp to flywheel we need turbos with good flow(map) for this power, 1.3 bar hold boost pressure and free flow exhaust system

Can tiptronic hold this power lever ? because this project car is with tiptronic transmition, not manual

PorschePhD

You need a lot more than that. Inlets, pressure hoses , fuel pump, lines, injectors and more. Of course the above mentioned as well.

A tip will hold the power. No problem.

kelesha

So original injectors are maxed to 600-640hp may be, or ? Above that can we use 5bar FPR without change the injectors for 700hp stage ?

Of course we will built new turbo inlet way from AFM to turbochargers, 2.5" piping from every turbo and then custom V-joint to AFM

Craig.

Craig