hi guys,

any opinions on the 69mm turbine turbos from XR? any reviews on the 105-69s? comparison to Precision turbos?

 

The 105-69 is a horrible mismatch of compressor to turbine wheel sizing. Don't do it as the turbo will be laggy. If you're looking for over 1000whp, look at the Garrett G42-1200 which pairs a 91mm compressor with 82mm turbine. Notice the wheels are much closer in diameter compared to the 105mm comp and 69mm turbine of the Xona. The G42-1200 was used on the fastest time attack car in the world last year at WTAC, The RP968 Porsche. Precision are not durable, so unless you like swapping turbos often, stay away. If you're looking more for around 800-900whp, look at the Garrett G35-1050.

 

105 refers to how much it flows. Its more of a 7269 in precision turbo terminology.
Xona terminology is how much it flows for the first part and turbine exducer size for the 2nd part.
With that said, 72mm comp inducer and a 69 turbine exducer, how does that sound?

 

That's what I get for not drinking my coffee. 99mm comp exducer and 78mm turbine inducer. Still a really bad mismatch. Also note the much smaller exducer diameter G42-1200 91mm compressor flows ~110 lbs/min. Based on the better wheel size matching of the G42, it's going to have better turbine efficiency which will reduce lag and improve power. The peak compressor efficiency of the G42-1200 at 79% is about as good as you're going to get. I haven't seen anything higher than 80% without using a vaned diffuser.

 

But the g42 have a bigger turbine wheel. Would not that result in more lag?

 

The Xona 105-69 is basically an FP Super99. It's a good turbo, and you can find results in it by looking up super 99 results.

The g42-1200 will be hard to find results for, but the smaller g-series stuff spools well and makes and solid power. I'm sure that translates into how the bigger stuff works.

The turbo sizes your getting into here are for 1000hp+. What really is your HP goal?

 

Now on a 745whp fp zero, looking for the fastest spooling among the 1000hp turbos.

 

1000whp and "fastest spooling" is kind of an oxymoron. All the modern aero turbos are likely to come on around 5500-6000 if they're large enough to make 1000whp or more. Pick your poison and enjoy, and build a spare a motor before the car hits the dyno.

 

Why wouldn't gen 2 gtx 47xx start looking good here.

 

Never mind theres not much turbine housing options.

 

yes i understand thse biig turbo is laggy. ok but how does a 6870 pte comapres to XR9569s. both 68mm comp. which would be a faster spooling turbo?

 

Long story short, no. Long story, it's about blade speed ratio and the effect on turbine efficiency.
https://motoiq.com/turbo-tech-compre...map-details/3/

Example, the GTX3076R is a mismatched combo. The GTX3576R with the same compressor wheel, but larger 68mm turbine vs 60mm turbine, spools up practically identically but makes 50whp more.

 

Without actually testing them, you'd need to have both the compressor maps and turbine maps for both turbos But that data doesn't exist. So you'll have to find someone that's tested them both on the same car or do it yourself. If you're looking for a lower cost turbo, go with Borg Warner.

 

This is basically the same turbo I am currently running. You would want to look up the Borg Warner s369 turbo. I will say on a 2.4 with very little tuning down this turbo is far from laggy for me. Extra displacement and the fact I run high compression does help alot. The only real difference between Xona and the Borg I run is the hot side. Xona uses the TIal housing where the Borg does not. This info is straight out of the engineers mouth at Tial being I was Going to upgrade to the Tial housing and he told me for what it is worth and the price don't bother.

 

Your best bet would be to look at what a super99 does on a similar setup, and assume the 105-69s will see improvements everywhere.