K24 - Maximum Power with Mods
 

I was reading a pile of sites and threads on the stock 996 TTS / X50 K24 turbos. As most people seem to go to the billets before reaching the limits of the K24s I was wondering what max hp levels had been measured on the K24.

I have a few mods like AWE GT2 high flow exhaust, EVOMS vflow intake, ID1000s, 400 Wallbro intank E85 pump, Eurodyne Tune (running 93 octane and a little E85, say E20), GT2RS IC's, new Sachs clutch, Ohlins GT2/GT3 suspension, LSD etc - RWD

If I tune it up a touch (currently 1.1-1.2 bars, doing 30-100 mph = 5.98s) what max CRANK hp will K24's hit before they become a negative.



PS I intend adding Carillo Rods some time later this year before going full E85 and probably Garret turbos etc

The stock K24s will max out around 560-580 at the crank. Upgrading to the 18G compressor will put you around 200hp more, and 20G will be 60hp past that.

TY, so anything pushing above 560 it will be sucking hot air

Basically. But they will be pushing some hot air even before that level because they will be getting away from good efficiency levels. The RS intercoolers and additional ethanol will help, but not substantially.

A short and simple explanation.. Datalog your actual boost values, IC temp vs RPM in 4th gear and up. You will quickly see the data where the compressor wheel drop in output. It will NOT be able to meet the boost request to Redline. A rule of thumb for maximum efficiency is a pull producing 1bar across the RPM range. At 1 bar the wheel is efficient. When it drops to .9bar is where the right "X" limit is for PEAK efficiency. Factors include ambient temps, IC intake temp and fuel octane. You can then bump up the boost request to 1.2 bars and overlay the boost data.

Thanks Kevin, will log it in detail when I get her back... much appreciated

Bumping this thread, how much power has been dynoed with unmodified K24's?

Has anyone logged or dynoed is there a power increase raising the boost from 1 bar to 1.3bar etc?

I just analysed my Cobb Accessport log and at around 0.95-1bar with only a Cobb X50 OTS tune I am at 90% injector duty cycle, so it seem like an injector upgrade is in place pretty soon..

Listed maximum HP is 575, any more, you're just blowing hot air.

I found this post made by the original poster:

"I have measued my car at each level of modification from tune, tune and exhaust all the way to FBO and E85 for the K24s

Basic car = 450 bhp
+ Exhaust = 500 bhp
+ Tune = 540 bhp
+ Fueling = 590 bhp (ID1000s, Wallbro 400 FP)
+ MAFLESS, ETS ICs etc = 620 bhp
+ E85 tune = 680 bhp - 750 bhp (85F temps down to 35F temps)"

680hp (crank) seems high from stock K24's even on E85 but who knows. Does anyone have real data and not just internet fact what they've read online?

Not accurate; look at the Borg flow charts - they are pretty clear that a K24 only supports 575hp.

Do you have a compressor map for the K24 you can post?

Not on hand, but a quick Google will turn it up.

Just get them turned into billets. Holding 1.4 bar to redline with good fuel is really nice! I do have rods and slightly lower compression though.

If this is the correct K24 compressor map as there are different K24's made. A stock K24 flows ~32lbs at 1.3-1.4 bar. So with two of them that would be 64lbs which is over 600hp (crank) unless the hotside chokes it. So I think ~620hp is possible if they are pushed hard.

Would be nice to see real world results though.

https://cimg7.ibsrv.net/gimg/rennlis...bf03d341dc.jpg

Won't that be hot air though costing you efficiency and detonation?