gesTTalt

single injectors rather than having a secondary injector system. We've been talking with Hans Dahlbeck in Sweden, and he's advised that the heads can take up to 375 hp with no problems. After that, he starts doing more internal modification of the heads. We'll see what happens when everything is bolted on. Just hope the car will at least start! (and stay on!!)

Havepitty in W.Van

i've looked at lots of turbos and its not the boost, but rather the flow rate, and efficiency map.

on the fuel side, injectors are not expensive, and you shouldn't upgrade fuel pump unless its really neccessary. upsize your MAF housing with injectors - you shouldn't need any piggy computer, but would be nice to have one.

i've run matched injectors and MAF housing for a few months a while back - no engine code, and seems to be ok. the only downside it that computer estimates wrong distance on the fuel tank plus about 15% short term fuel correction.

gesTTalt

customed cnc'd to match the manifold and downpipe. We'll know more this week.

Here's the compressor map:

"The charts display boost pressure (psi) versus mass air delivery (converted to horsepower) versus compressor efficiency."

<img src="http://www.4subaruparts.com/pics/990-060-300.jpg">

"The chart above shows the TD04 performance envelope inside that of the SR30 turbocharger (see through envelope). The APS SR30 turbocharger offers not only significantly improved air flow capacity over the TD04 but also a much greater operational range. Where the TD04 has a maximum air flow capacity to produce 280 hp, the SR30 offers 340 hp. The chart below shows a clearer view of the inside of the TD04 and SR30 envelopes."

<img src="http://www.g-force-motorsport.co.uk/images/sr30_td04_mirror.gif">

xr4tic

The only way you'll hit that on a 1.8 is with a VERY good port job on the head, intake, manifold, etc. plus cams, etc.

Basically, you need a restriction to create pressure (boost) A more efficient motor can flow more air with less pressure.

Look at some of the stage III kits, they're running around 300hp with 22-23psi of boost (I'm guessing, I don't have a S3 kit

I'm running ~18psi on my 2.0, and my best guess is it's around 320hp.

xr4tic

Their website lists the highest being 500cc.

They do make a 550cc Low Impedance injector, which will NOT work with the stock ECU (it will fry it)

EasTTcoasTT

With a larger intake manifold already, lower compression, different internals, etc.

xr4tic

If it's a 1.8T, I think you'll fall real short of the 350 mark at only 18psi

Toaster29

18-19 lbs...but thats also on a turbo designed for 290.

xr4tic

Yes and no.

I'd really like to know where they're getting the 350hp number from.

350hp may be obtainable from a 2.0 running 18-19psi, but run that same pressure on a 1.8, assuming a linear displacement/HP curve, then you're down to 315hp.

It's all about flow, displacement, and pressure.
Leave one of the variables out, and you're guessing at best.

Take a 1.8T running with the following specs:
6000 RPM
18psi (2.22 PR)
100% VE
0 pressure drop
0 inlet pressure drop
85F temp

will flow 30.59 lbs/min (832.55 kg/hr)

On a 54 trim T04E compressor (my compressor), thats a 76% efficiency, which is very good (the exact same as a Garrett GT32)

An IHI VF34 might have slightly better efficiency, but not by much.

You can get roughly 10 HP from every 1 lb/min, so 30.59 lb/min is equal to roughly 305 HP

You want 350 HP from that turbo, at that pressure, then all you have to do is get the VE of that motor to 115%, and eliminate all pressure drops.

EasTTcoasTT

Is it worth doing the 2.0 on the 225's?