MadDad DP'back Exhaust + JB3: Video+Dyno Charts

[///M1]

Finally was able to put together the video of the install and dyno (performed a week ago) of my MadDad downpipe-back exhaust (center pipe + axelback), coupled with a JB3 PnP (ran on Map 5 and Map 0 on 93 Octane Shell V-Power gas). Need to edit it some more (and perhaps add more Deadmau5 tunes ), but figured I share even in its current form.

Here is what you need to know. I dynoed the car (same DynoJet dyno, same operator, same gas station, same strapping method, same fans, same tires, etc.) fully stock last July. Numbers were 278wtq/283wtq. Not bad, and about what people have been getting of what seems to be a well under-rated 300hp-crank BMW-claimed engine.

The first set of dyno pulls were on the stock exhaust and JB3 Map 5, all else equal (running stock intercooler, airbox, filter, DPs, etc.) Did 3 pulls, all pretty consistent, best numbers were 356whp/372wtq. So net, gains solely attributable to JB3 Map 5 a whopping 77whp/89wtq!

Next, I proceeded to install the MadDad midpipe + axelback. We ran quite a few runs immediately following the install (literally moved from the install bay to the adjacent dyno room so the car went through no real-world adaption). What the next dozen+ pulls indicated is that the ECU was continually learning and adapting. In between every 3-4 pulls we of course allowed for proper cooling. The best (but consistent across many runs) numbers attributable to JB3 Map 5 + MadDad Center Pipe + Axelback were 361+whp/381+wtq. In other words, incrementally MadDad added 5+whp/9+wtq on top of the JB3 gains. Notice this is just peak power! I suspect now that I have ran the car for a bit, the ECU is fully adapted and the exhaust has opened up (the sound is def more pronounced), gains are even better. Also note that gains are pretty uniform across the full RPM band, but it is down low that they are really massive, and in many cases double digit (so comparing peak vs. peak is not telling the full story).

Lastly, we switched the JB3 to Map 0 (basically stock), and did a few pulls which measured gains solely attributable to MadDad DP-back exhaust. The final figures were 281+whp/293+wtq, indicating a gain of 3+whp/10+wtq. Again, these are just peak-to-peak numbers, which are not the most relevant. Observe how much fatter the tq curve is all along the way, but once afain most pronounced down low.

I have superimposed all 4 runs to get a visual. The titles are self explanatory. In summary, money well spent, just with a piggy back and DP-back exhaust, car has gained over 80whp and 100wtq, or around 361+whp/381+whp total! Not bad at all. I figure an intercooler, a drop-in filter, and/or DPs definitely ought to get me in the 400whp club. Next however is the M3 subframe bushings, def need to firm up the ride even more given the added power (the BMW PS has done wonders, but can get further help with a stiffer rear)

In closing, I want to share/reiterate how great of a product the MadDad exhaust is. Craftsmanship is excellent, fit and finish superb, sound characteristics – unique.

YouTube Video here:

Dynocharts:

[moveswiftly]

great #'s...i want a JB3 and maddad exhaust :/

[mineo77]

highly rec the maddad system!

[BMW86]

I have to give props to ///M1 for putting all this work altogether. Many of us say they will post reviews and dynos but never get around to doing it. In my case, this is exactly what I was looking for and I'm also happy that the variables have been kept consistent to provide the most realistic results possible.

///M1 have you considered running the JB3 on Map 6 or 7 with your downpipe back exhaust? I would be very keen to see dyno numbers for that run too

[///M1]

Originally Posted by BMW86

I have to give props to ///M1 for putting all this work altogether. Many of us say they will post reviews and dynos but never get around to doing it. In my case, this is exactly what I was looking for and I'm also happy that the variables have been kept consistent to provide the most realistic results possible.

///M1 have you considered running the JB3 on Map 6 or 7 with your downpipe back exhaust? I would be very keen to see dyno numbers for that run

Pleasure was all mine, nothing like a bit of knowledge sharing between fellow 1Addicts

I have a fairly local to me Sunoco that sells 100 Octane fuel. I think the next time I go to the dyno, I can do that, fill up with the $8.50 per gallon (yikes) race fuel and switch to Map 7. Will probably add a Macht Schnell/Terry Burger drop-in filter and measure the gains respectively while at it. I'll need to drive a bit though as the ECU does need to adapt once you switch to higher Maps, but won't be an issue as the dyno is in CT anyhow. Eventually will do it, curios myself, and will report back. I really think though that presently the stock DPs are the next biggest bottleneck to seeing more power.

[BMW86]

Originally Posted by ///M1

Pleasure was all mine, nothing like a bit of knowledge sharing between fellow 1Addicts

I have a fairly local to me Sunoco that sells 100 Octane fuel. I think the next time I go to the dyno, I can do that, fill up with the $8.50 per gallon (yikes) race fuel and switch to Map 7. Will probably add a Macht Schnell/Terry Burger drop-in filter and measure the gains respectively while at it. I'll need to drive a bit though as the ECU does need to adapt once you switch to higher Maps, but won't be an issue as the dyno is in CT anyhow. Eventually will do it, curios myself, and will report back. I really think though that presently the stock DPs are the next biggest bottleneck to seeing more power.

I appreciate your efforts

By the way, which version of JB3 are you running? I thought Map 6 and 7 was safe to run on 93 Octane.

[///M1]

Originally Posted by BMW86

Well I appreciate your efforts. By the way, which version of JB3 are you running? I thought Map 6 and 7 was safe to run on 93 Octane.

Version 1.4. Been thinking of doing the 2.0, but will wait once it becomes 'official'. I have the BT scanner, technically can do Map 7 and clear whatever codes do come up.

[yandy]

nice runs!

[HPFREAK]

Originally Posted by ///M1

Version 1.4. Been thinking of doing the 2.0, but will wait once it becomes 'official'. I have the BT scanner, technically can do Map 7 and clear whatever codes do come up.

I was wondering if you ever updated but there is no reason to wait on the 2.0 final. It is already really close and I have been running the 02/08/10 firmware for weeks now with no issues on map 5 with 91 octane. You really should upgrade and feel the difference. I have some chips. After all you have the BT.

Glad your car responded so well with great numbers.

[///M1]

Originally Posted by Brad@PSI MOTORS

I was wondering if you ever updated but there is no reason to wait on the 2.0 final. It is already really close and I have been running the 02/08/10 firmware for weeks now with no issues on map 5 with 91 octane. You really should upgrade and feel the difference. I have some chips.

Glad your car responded so well with great numbers.

Thx Brad! You are the one that started the whole mod endeavor, appreciate it

PM me pls with what entails upgrading to version 2.0. Cheers!

[Mike@N54Tuning.com]

Impressive gains! It looks like either your dyno tach signal is dropping out or smoothing is set to 0 instead of 5. If you haven't already do the 2.0 software upgrade as well.

Mike

[///M1]

Originally Posted by Mike@N54Tuning.com

Impressive gains! It looks like either your dyno tach signal is dropping out or smoothing is set to 0 instead of 5. If you haven't already do the 2.0 software upgrade as well.

Mike

Thx Mike, yeah, smoothing was set to 0 (and SAE correction factor), it's up there on the photo on the upper right hand corner but barely legible, sorry about that, I should have specified.

Def gonna look into 2.0!

[Schn3ll]

I have the same setup and I am loving it! Already getting tons of compliments and the sound is just awesome.