Yesterday, 05:31 PM
There was a time when 400 wheel horsepower seemed like a lot out of the stock frame N54 turbos. Then the 500 wheel horsepower mark was crossed. Then the 600 wheel horsepower mark. Now, we are on the verge of cracking 700 wheel horsepower with modified stock frame N54 turbochargers. Who ever thought this would be possible?
It truly is impressive and truly a milestone in N54 tuning. Really, it's stunning considering how many times in the past people would complain about the 'tiny' snails on the N54. Well, those tiny snails are making some big power with the right modifications.
BimmerBoost would like to congratulate member @The Ghost for his achievement. His data and details are below.
Continuing from my previous thread, I decided to go back to the dyno to do a few tweaks. My setup is as follows:
N54, FBO, 6MT
JB4 G5, Custom back-end flash
VTT 2+ turbos (20T, clipped)
VTT turbo inlets, w/BMS DCI
BMS Port Injection kit
Split Second injector controller (AIC1-G4H)
Fuel-it Stage 3 dual LPFPs
Stock exhaust (catted)
The only change since last time is I ditched my customer rear inlet, replacing it with the VTT silicone hose. This fits much better and is actually shorter than the one I build by a good bit.
I didn't have long on the dyno, so I upped the boost slights (holding 27.x) and added some mid range timing (10 degrees max now). I was very pleased with the results.
Here are a few notes:
I still have a tip-in rich condition, which I will fix in the PI map
Boost is not hitting target (28psi) - I may change the JB4 rpm-based duty bias to see if it will hold 28psi (there seems to be more pwm headway, albeit small)
The car kept making power with timing - I think I could run 2 more degrees as VTT did, perhaps cracking 700whp - I decided not to risk popping the motor today :)
I'm still waiting to remove the catted exhaust in favor of a 3.5" single
Attached are some dyno comparisons:
Comparison between my previous personal best and my runs today
My maxed FBO meth/e85 car vs. my final tune today
FBO map 0 baseline vs. today's final tune
Here is the datalog of the last run:
Special thanks to Terry@BMS for the extensive support and parts, Fuel-it, and VTT for badass products and killer support.