Whats the reason for these IXs to be putting out insane numbers, on track/dyno?
-better ecu
-better designed head, more resistant to knock?

 

MIVEC and slightly different turbo from the later models.

Plus it narrows down to a tuner, you can have every top dollar part available for these cars but if you tuner can't properly tune worth dick your car is gonna be as good as paper weight.

 

Search please

 

a combination of improvements - bigger turbo compressor housing and compressor wheel, MIVEC head with higher lift intake cam, redesigned block with improved coolant passages to help resist knock, more advanced ECU.

god i hate IX's

 

Its better because I bought an VIII! Now if I had bought a IX the X would make 500hp by changing the air filter!

 

The IX can run higher boost and more advanced ignition timing than the VIII due to better combustion chamber heat removal because of the new cylinder head´s improved coolant passage design.

The IX turbo has a larger, more efficient, colder blowing compressor housing, which reduces intake temps and allows for higher boost levels on any given octane gas, than the VIII turbo. Also, MIVEC design optimizes torque and midrange power.

 

More pricise mapping, more volume of air for same psi), and more effective control of feeding that extra air (variable camming).

Still happy with my 04 though

 

search

there's the MIVEC and a different turbo

 

Wait a second...

The IX's have a different coolant passage design???

And how does a compressor housing allow for colder air? Compressed air = heat, the more compression the more heat. The only thing I can think of that would allow for a cooler air charge would be a better intercooler.

I question this because its the first time Ive heard of this. Im not doubting, rather just asking if anyone else can back this up since its new info to me...

 

Remember it ain't the pressure that gives boost more HP, it's the # of air units available to blow up. And bottom line, with MIVEC and ECU mapping, the IX is more efficient at consuming, and is readily capable of supplying more units of air/psi for this, dats what I think.
Not sure about about compression (or in this case, boost) but I thought the driving force behind boost capacity chiefly depends on the the turbine inducer/exducer and the combo in it's respect and isn't this, along with hotside, the same as the VIII?

Wouldn't the 9's increase of boost be from increase of achieved load from all it's other superior characteristics?

 

if you have two turbo's running the same boost, a more efficient turbo will have lower air temperatures. I don't remember the exact formula, but it is a ratio of temperatures & pressures, with an inverse ratio to the efficiency. something like:

TempOut = (PressureOut*TempIn)/(PressureIn*efficiency)

i doubt i remembered it right, but it's probably on the net somewhere

 

You absolutely right, efficiency was the variable I left out in terms of temp out. Good call. Thermodynamics was not my friend in college! The forumla is close to correct, if not correct.

As for the previous post about pressure not giving more hp but the amount of air molecules that are present to blow up, they are one in the same. Higher psi = higher amounts of air molucules per area; aka pounds of air per square inch.

 

By operating at less than peak efficiency, compressed air is heated. For example, an efficiency of 65% means that 35% of the energy is heating the charge air above the dictated thermodynamic equations.

There are several upgrades available to increase the compressor's flow, pressure ratio and efficiency. Either the compressor wheel or the compressor housing can be changed, or both the housing and the wheel can be changed.

In a nutshell, by changing the A/R ratio of the compressor housing(the A/R ratio is the area of the scroll divided by the radius from the centerline of the scroll to the shaft centerline), the new IX turbo's housing design allows the compressor to operate in a more efficient range at a lower shaft speed.

 

Yea, like I said I was an idiot and never considered efficiency. Guess thats why thermodynamics was never my strong suit, haha. Good info on the a/r ratio as well. Deal with compressors a lot? Or just a hobby? Thanks