Bullet Performance supercharger by Mercury Performance

[E92M3Guy]

Originally Posted by mines13

Oh, it can get even worse. If it is the vacuum pump wide band Dynojet offered for years, even if the sensor is remotely accurate, you are seeing A/F information that may have occurred 1000rpm earlier. Effectively rendering any A/F information unreliable. The only proper way to monitor A/F is to mount the sensor directly in the exhaust stream and bypass the horrible pump.

I'm guessing Dynojet has figured this out because...

We datalog the BMW's at the same time as the dyno. This allows me to correlate the car's wide band to the Dynojet wideband on a per-RPM basis. With a properly working wide band on the Dynojet, we do see very accurate correlation with the car's wide band vs. Dynojet wide band. So I'm guessing Dynojet has figured this out by now.

[mines13]

Originally Posted by E92M3Guy

I'm guessing Dynojet has figured this out because...

We datalog the BMW's at the same time as the dyno. This allows me to correlate the car's wide band to the Dynojet wideband on a per-RPM basis. With a properly working wide band on the Dynojet, we do see very accurate correlation with the car's wide band vs. Dynojet wide band. So I'm guessing Dynojet has figured this out by now.

I assume you were not using the vacuum pump device? I have had nothing but issues with it. That said, if you just run the sensor in a bung, it can work. YMMV

[E92M3Guy]

Originally Posted by mines13

I assume you were not using the vacuum pump device? I have had nothing but issues with it. That said, if you just run the sensor in a bung, it can work. YMMV

I'm not familiar with the vacuum pump device. The Dynojet shops out here just stick a standard Bosch wide band O2 sensor in the tail pipe; and that plugs into one of the Dynojet stack modules at the other end.

I tried searching my database for examples where I correlated the data. I have two or three examples on my computer, but none that I've published (sorry). The closest I could get you was a Dynapack run where I data logged and correlated. It's identical to what I've done on Dynojet as well, and the correlated data in this graph will match very well what I've done on the Dynojet. But keep in mind, this is from the Dynapack, not Dynojet. If you want an actual Dynojet example, just shoot me a PM and I'll email you the Excel spreadsheets with the correlated data.

Here's the Dynapack example I was talking about.

[mines13]

Originally Posted by E92M3Guy

I'm not familiar with the vacuum pump device. The Dynojet shops out here just stick a standard Bosch wide band O2 sensor in the tail pipe; and that plugs into one of the Dynojet stack modules at the other end.

Understood, they have a later model 0-5v input setup. This is good, this is not the old system.

I tried searching my database for examples where I correlated the data. I have two or three examples on my computer, but none that I've published (sorry). The closest I could get you was a Dynapack run where I data logged and correlated. It's identical to what I've done on Dynojet as well, and the correlated data in this graph will match very well what I've done on the Dynojet. But keep in mind, this is from the Dynapack, not Dynojet. If you want an actual Dynojet example, just shoot me a PM and I'll email you the Excel spreadsheets with the correlated data.

Here's the Dynapack example I was talking about.

Two different sample rates or did you apply smoothing to the logged AFR through the external wide-band? Looks good, BTW.

[Matador]

More updates. Less **** measu...........I mean less arguing about who knows more about dynos.

Thanks in advance.

[E92M3Guy]

Originally Posted by mines13

Two different sample rates or did you apply smoothing to the logged AFR through the external wide-band? Looks good, BTW.

The Dynapack was 1-sample per RPM; so it's very smooth already. I use 400 RPMs per second ramp rate. On this car, it was 2000-8400 in 16-seconds.

The two OBD measurements (left-bank and right-bank of the S65 V8) are sampled at the mercy of the BMW DCAN interface. The sampling rate ends up being approximately 120 Hz. No smoothing applied.

[sw20kosh]

STOP THE DISCUSSION ABOUT DYNO's IN THIS THREAD. THIS IS NOT A THREAD ABOUT DYNOS. CREATE YOUR OWN THREAD.

THIS IS A THREAD FOR ANY UPDATES ON THE BULLET SUPERCHARGER.

[Coheed]

But without dyno talk, how will this thread stay bumped? lmao

[ill86]

Holy hell... I thought there was a dyno regarding this sc kit...

Mods, can we get this topic split?

[Coheed]

I agree the thread has gotten off topic, but if there was a split there would be like 4 posts.

[Floggin Tires]

Originally Posted by sw20kosh

STOP THE DISCUSSION ABOUT DYNO's IN THIS THREAD. THIS IS NOT A THREAD ABOUT DYNOS. CREATE YOUR OWN THREAD.

THIS IS A THREAD FOR ANY UPDATES ON THE BULLET SUPERCHARGER.

^speaking the truth^

Originally Posted by ill86

Holy hell... I thought there was a dyno regarding this sc kit...

Mods, can we get this topic split?

Originally Posted by Coheed

I agree the thread has gotten off topic, but if there was a split there would be like 4 posts.

[Coheed]

Wow, pictures and everything. I get the point hahahaha.

[Tradewind]

Mods need to rip into this thread and clean it up

[xwd]

In for the dyno chart. Think how bad it would have been if there even was a dyno chart.