RIRENTERC6

Received my BMs filter today. Pretty simple install. Took around 20 minutes.
First impression is quicker throttle response. This coupled with my Katech TB and Diablo 93 oct tune have pretty much eliminated the throttle lag.

Now to the technical stuff. After 20 miles i decided to log the car with the diablosport intune I2. I’m not sure what to think of the numbers. Can someone explain what I am seeing? Looks like the MAF sensor mass airflow(g/s) is less with the BMS filter than with the stock filter. Is this correct? I figured i would see a bigger number with the BMS filter.

Also noticed 4 degrees of knock retard in the 6000 rpm range. I did not notice any blinking lights on the dashboard so I’m assuming that’s a good thing. Should i richen up the A/f using the diablo intune to eliminate the knock? Or should I just leave it alone? Please see attached pictures. I will drive it some more tomorrow and complete another log.
Thank you

geterdone

I will ask my buddy who tunes.

RIRENTERC6

It’s safe to say this filter is coming off ASAP!! I am not liking all this knocking. Logged the car again tonight. My car seems to not like it.

0Terry@BMS

The filter or an intake is not likely to increase your knock count, as the boost increase is going to be less than 1psi, but I have no idea how your tuning is setup and your logging interface is difficult to read.

I'd ditch that tune and retune with HP Tuners. If you are knocking across multiple cylinders you probably need less timing advance in those areas. You may also need to rescale your MAF input to match the higher flow intake. If you post an HP Tuners log I can give you tuning pointers based on that data.

RIRENTERC6

It’s the diablosport 93 oct tune. It’s a can tune, so I would assume it’s very conservative. I have the log but you need the free diablosport log viewer software. I will post the log if you are interested in viewing it. change the file to .log.

0Terry@BMS

I looked at one of their files once and it was fairly awful. Already voided the warranty tuning, why not use HP tuners so its tuned right?

I would guess what you need to fix on that tune file is the MAF scaling. Raise it so your MAF reading is the same with the filter as it was with the stock filter.

RIRENTERC6

I do not have access to HP tuners & I have already invested in the Diablo Tuner. I have returned the car to stock programming. I will drive around tomorrow and log the car again with the BMS filter and the stock tune. I will post that tomorrow.

Kracka

You can always get a custom remote tune with your Diablo InTune from DiabLew. I'm very happy with his work on my car, and the process is quite easy (and affordable). He goes by 06MonteSS on here.

http://www.diablewtune.com/

Z0Sick6

I second doing that ... OP.

RIRENTERC6

I had him tune my TCM last month (which is awesome!!) I sent him the logs last night and he sent me a updated ECU tune this morning. He mentioned scaling the MAF which would add a little more fuel. I’ll run it for a few days and provide the results.

0Terry@BMS

Internets_Ninja

Resurrecting and old thread. The reason for the knocking is because the BMS filter causes the MAF to read less air which directly results in a leaner air fuel mixture. The Diablo tune already leans out the Air Fuel so pairing that with the BMS would make it run too lean and will knock. You need to have the MAF calibration changed to bring the Air Fuel back in line. There is enough room in fueling with the stock tune to run just the BMS filter, but not with the Diablo tune.

RocksZC7

What results did you get with the custom Diablo tune & the BMS Filter? I have a 2016 Z06 and experienced the same type of knock retard with both the 91 and 93 octane tunes.

jstewart

A couple of years ago when I bought a Diablo tuner from Lew I later found he would not do a remote custom tune on a supercharged car. Has this changed?? Had a problem with the Diablo tuner and when it was returned for repair they wiped my stock tune. Car ran great with the Diablo 93 octane tune, intake, midpipe and ported TB. But when I lost my stock tune and thus my warranty I just went ahead and did a HP Tuners tune.

BMS_Z06_FAN

The higher knock count could also just mean you're making more power now and would benefit from higher octane. I'm not familiar with the Diablo tune though but when doing any tuning the tuner will take in to account whether or not you have an intake. The BMS drop in filter is so good it's equivalent to an aftermarket intake as far as tuning goes.

Internets_Ninja

The higher knock possibility is due to the air fuel leaning out and the spark value increasing since the BMS causes the ECU to read less airmass. Since the Diablo tune already leans the Air Fuel ratio the BMS makes it too lean and it is far more prone to knock. This isn't up for debate. It is a fact.