Not sure how often people make mods and only change turbos in order to give a apples to apples comparison, but this is close-ish.
My stock 2005 Evo 8.5's turbo was finally giving up so I was looking for a replacement. I wasn't really looking for making that much more torque, but was hoping to extend the torque curve out from its peak at ~4600 from where it drops off pretty quickly.
The main change was going from 2005 Evo 8.5's stock turbo - to - FP Evo IX 71HTA CHRA
Other changes made in the process were:
* Stock J-Pipe & I/C lower pipe - to - Buschur Lower I/C kit
* stock wastegate (12-14 psi?) - to - 19 psi replacement.
* re-tune (same tuner)
Here is where the car started
https://www.evolutionm.net/forums/ev...fords-e85.html
basically:
2005 Evo 8.5 MR on e85 with stock turbo, max boost 29psi tapers to ~20psi
Kelford 272 cams
Buschur downpipe
Resonated test pipe
RRE - Stealth Catback
Milspec 65mm Throttle Body
AEM intake p/n 22-435
and id1050 injectors, Fuel Pump - Walbro 255, ARP head bolts, valve springs & Ti retainers, 3-port e boost controller, 4 bar Omni map sensor, EGR block off valve, EVO X blowoff valve, JDC Coil-On-Plug Ignition System (COP)
Having trouble getting the dyno plot from the tuner, but I always trust GPS on the road more than dyno's that vary from type to type and even with the setup parameters on an individual dyno. My numbers/plots always seem noisier, but at least I can control so this part is apples to apples (so please let's not argue over absolute scaling).
Anyway, here is a comparison with the 2021 being with the new FP 71HTA and the 2019 data being the stock turbo.


They look pretty indistinguishable up to 4000 rpm, the stock turbo MAY have slightly out-max-torque'd the FP from 4-4.7k, but then the FP slightly (up to 20 ft.lb tq & 30 HP) out performs the stock turbo out to redline although still drops off more than I wish it did.
Can't speak to the tuning effort, but I'll try to see how hard he tried to extend the torque out.
For me, I was needing to replace the stock turbo and hoping to reduce the fall off at higher revs and I did all that, just not as much as I'd hoped.
Moderators - If this is the wrong place to post this, feel free to move it.

 

For the mods you have the Turbo should be making more power than it is. I wonder whats causing the botteneck.

 

Yeah. Was hoping for a bit more than I got.
Are you thinking just more top end or more mid range too?

 

Here is mine on a low-reading Mustang dyno on a hot day.

 

Was the sun in your eyes too?
JK (that is my fave excuse for everything)
Your mods and performance look pretty similar.
We both get up to ~250 Tq around 3500 and both tail off to ~275 at 7100-7200 revs, but I peak up a little bit more in the central revs (if you believe the absolute scalings).
Thanks for sharing.