924Board.org

[vemser]

Hi everybody!
I need your help with my manifold


European XK, VEMS EFI. I plan 0.5 bar boost.
Maybe you know some popular cheap turbos which will good for me.
The flange sizes writed later, sorry don't remember now.

[Raceboy]

Hard to tell from the picture, but it seems to be T3 flange. You could use K24 from Audi 20V turbo that is a good and cheap turbo or find Nissan Silvia S15/Skyline GTR T28R ball bearing/ceramic turbine wheel turbo that offers excellent response. They go for like 150-200 euros, K24 is going for around 100 euros max.

But it should be internally wastegated turbo!
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[vemser]

47*60 central hole
70*83 hols for mount

[vemser]

I checked garrett catalog for turbine flange's name, it's "T4"


Garrett's name GT3571 - Ok, but it's non-wastegated.
Looks huge

[ideola]

The Audi K24 may not be what you want...it will run out of breath even sooner than the stock K26 units:


I'm sure you can find some combo of a T4-compatible hotside with a modern Garret setup that will be suitable in size, internally wastegated, and much more efficient than a KKK unit.

Care to share any details of your build?
_________________
erstwhile owner of just about every 924 variant ever made

[vemser]

It's just street car for dayly driwing. 200hp should be enough for stock pistons and clutch .

[ideola]

By my calcs, 200 HP on an otherwise stock build will require ~12 psi, which puts your air flow requirements in the neighborhood of ~17 cm^3/sec, with a pressure ratio of ~1.82. Looking at those numbers plotted on the above map, the Audi K24 just might do the trick...
_________________
erstwhile owner of just about every 924 variant ever made

[vemser]

More details)

[vemser]

ideola, can you show your calcs, i'm not sure about 1.82, i think it's less...

[ideola]

[ideola]

Nice pix, by the way

You might find my Engine Modification Horsepower Calculator thread somewhat useful. There is a downloadable excel spreadsheet linked there that contains all of the calcs.

In particular, take a look at Scenario 1 (in the screenshot of the spreadsheet posted there), and look at the 12 PSI setting, which should be fairly close to what you're targeting.
_________________
erstwhile owner of just about every 924 variant ever made

[vemser]

Yee, the same result.
I'm looking in "maximum boost" page 26 and think about if.

[vemser]

[ideola]

Higher compression, I think, but shouldn't have a huge impact on overall targets, but will have to take into account for detonation...looks like you're planning to run a 951 FMIC, so I don't think you'll have too many problems at 12 psi.
_________________
erstwhile owner of just about every 924 variant ever made

[Raceboy]

Actually K24 is better turbo than K26 as it's more efficient and is more than enough for turbocharging stock 924 NA.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche