[s1uma1]

for those interested, I just went from a BMS Stage 1 to a Dinan Stage 1 in my 6spd m235i. I wanted to try Dinan b/c even though BMS had great improvement in power, I wasn't too happy with the response of the car and delivery of power.

BMS felt like it had much more torque, which really kicked in around 3000RPM and kind'a tapered off at 5500-6000RPM or so. Throttle response was a bit lacking which made it more effortful for smooth rev matching. Almost felt like throttle sensitivity of "Comfort" was transferred over to "Sport". Power delivery seemed a bit rough towards 4-5K.

Dinan doesn't have that instant torque on at 3K RPM feel, but actually feels like the car pulls more towards high end all the way to redline. Throttle response is very good. Noticeably better. Feels like the stock "Sport" mode now. Power delivery is beyond smooth.

To me, I can't really tell which car is faster, seems like BMS tuned more towards low end torque and Dinan more towards high end pull. Driveability is noticeably better w/ Dinan tune.

These are my subjective opinions to those who care. Unfortunately, no dyno. I'm hoping that when i go to stage 2, i'll be able to do a baseline, stage 1 and then stage 2 w/ airbox...

hope this mini-review helps! =)

[alexc93]

They're both piggy backs... i can't imagine timings etc are that different.

I imagine dinans is just much milder tune for the money and thats why it feels smoother

[The Nerd]

Originally Posted by alexc93

They're both piggy backs... i can't imagine timings etc are that different.

I imagine dinans is just much milder tune for the money and thats why it feels smoother

Actually, they both dyno around the same peak horsepower (330ish WHP), but to me, the improved driveability of the Dinan makes it far superior. Furthermore....the area under the curve is greater with the Dinan (thus the greater pull toward redline)....and that's what truly matters in my opinion.

It's about total area under the curve, NOT a spike that's higher here and there.

[e46m3lol]

The spikes in tq/hp can simply come down to the JB4 not being properly tuned. I know I had the issue on my own 2 series until I did some data logging, after some back and forth emails with Terry I was able to get my JB4 to run smooth all the way through the rpm range all while having lots of power.

I can't justify paying $2k for a piggy back system when the JB4 works great.

[alexc93]

Originally Posted by e46m3lol

The spikes in tq/hp can simply come down to the JB4 not being properly tuned. I know I had the issue on my own 2 series until I did some data logging, after some back and forth emails with Terry I was able to get my JB4 to run smooth all the way through the rpm range all while having lots of power.

I can't justify paying $2k for a piggy back system when the JB4 works great.

Just out of curiosity what sort of power are you pushing with your 228 and all those mods?

Just wondering if its more than a stock m235i or close to what you'd have paid for a stock m235i?

[J-Sud]

Originally Posted by alexc93

They're both piggy backs... i can't imagine timings etc are that different.

I imagine dinans is just much milder tune for the money and thats why it feels smoother

Stg 1 bms doesn't have full control If I'm not mistaken.

I completely agree with the ops review - Dinan is super smooth and has better top end over stock.

[s1uma1]

Originally Posted by The Nerd

Actually, they both dyno around the same peak horsepower (330ish WHP), but to me, the improved driveability of the Dinan makes it far superior. Furthermore....the area under the curve is greater with the Dinan (thus the greater pull toward redline)....and that's what truly matters in my opinion.

It's about total area under the curve, NOT a spike that's higher here and there.

Yes. It's the improved driveability that makes me prefer the Dinan, even at the expense of a couple horsepower and initial cost. I suppose JB4 would be nice but I'm not tech savvy enough to do data logging etc... :/. Can't wait for the stage 2!

[rosenbergendo]

They do NOT make the same peak HP. It has been shown the Dinan stage 1 is a very very mild tune and is nowhere near as powerful or torquey than Dinan Stage 1.

[quicknick235]

Originally Posted by The Nerd

Actually, they both dyno around the same peak horsepower (330ish WHP), but to me, the improved driveability of the Dinan makes it far superior. Furthermore....the area under the curve is greater with the Dinan (thus the greater pull toward redline)....and that's what truly matters in my opinion.

It's about total area under the curve, NOT a spike that's higher here and there.

Horay for calculus!

[jstnstr]

Originally Posted by rosenbergendo

They do NOT make the same peak HP. It has been shown the Dinan stage 1 is a very very mild tune and is nowhere near as powerful or torquey than Dinan Stage 1.

Making a pretty strong case here

[The Nerd]

Originally Posted by rosenbergendo

They do NOT make the same peak HP. It has been shown the Dinan stage 1 is a very very mild tune and is nowhere near as powerful or torquey than Dinan Stage 1.

Ok.

[alz0rz]

Originally Posted by The Nerd

Ok.

335 != M235i

[The Nerd]

Originally Posted by alz0rz

335 != M235i

I have the 335 with MPPK, so essentially the same stock engine as the M235i (320 crank hp and 332 crank torque). That's the only reason I chimed in....otherwise I would have stayed over on the f30 board lol.

[mike@x-ph.com]

Thank you for the review
In terms of power BMS offers more boost and there is still room for more if have the data cable.