Hi all just want to share some advancements we've been making with the N55 engine with regards to tuning.
As we know the M235 utilises the N55 engine with a claimed flywheel power of 245kw... real world though, they seem to be dynoing rather high as we see results from 215-225rwkw, indicating that they are likely a tad underrated. Conversely, the 335i/435i that are rated at 225kw
flywheel seem to be spot on dynoing around 185-195kw at the rear wheels.
This is one of our customer's cars who has had a JB4 for about 12 months now and recently got in touch with us to see if there was anything new we could do for more power. We suggested removing the piggyback and going for a proper flash tune. (The car also has a downpipe with high flow cat)
The method was:
1. Powerrun 'as is' with the JB4 in to set a benchmark (237rwkw)
2. Remove JB4 and do a stock run (220rwkw - not far off the very first dyno run we did with this car approx 18months ago of 217rwkw)
3. Upload flash tune for final run (261rwkw)
Both us, and the customer are very pleased with the results. If anyone is interested in more info or would like to get this dyno to their M235i get in touch with us via
www.bmraw.com.
For 220i & 228i tuning see this thread