[madmanhiker]

I just did 6 dyno pulls with on a 2011 n55 e92 with the following mods:

Vishnu 3.5" cat-less dp
N55 Stage 1 - MAP 1 +3.5psi
Remus Race Exhaust
aFe CAI n55

The highest pull was: 304.69 RWHP - 321.85 TQ

I am not pleased with those numbers at all, moreover - pretty pissed off. There was a BONE stock n55 there that pulled 290 rwhp and 291 tq after 3 pulls and all pulls were CONSISTENT.

Mine ranged from 272 rwhp to a max of 304 - TQ wasn't consistent either.

I will post the graphs later tonight, and no I didn't log because I left my laptop at home and all the n54 guys had the wrong JB interface.

BUT...... still. Those numbers suck - and go against what Shiv put up for just the Vishnu catless dp alone - as well as the BMS numbers for the Stage 1 tune.

We even took the aFe CAI OUT and forced adaptation. Then threw it up on the dyno AGAIN for 2 more pulls. Apparently, the CAI helps - the numbers were LOWER than STOCK N55 (WITH a BMS TUNE and SHIV DP)

W.T.F.

Some details:
I have Auto (Steptronic) - Dyno was performed on a Dynojet here in Jacksonville, Florida. I was the last of 6 others on the dyno - ALL others number were consistent to their mods (n54 & n55 respectively) I drove car to the dyno location (just as the other drivers did) in 92 degree sunny weather for about 20 minutes. We all popped our hoods, since I was last my car was able to cool almost 2 hours. I have BLACK paint. Humidity was low at 50% (sunny day) altitude about 40ft above sea level.

In an effort to seriously deduce issues, please refrain from n54 / n55 hate. We are all enthusiasts here and I think that my issues may help others.

Thanks in advance - I look forward to anyone's comments or suggestions.

*** EDIT: I live in Jacksonville, Florida.. we have 93 octane here - that is all I use. Shell V-Power 93. I also have an APRIL 2010 build - DME has NOT been updated. It's Africa hot here, but again, others there same day same dynojet dyno to compare to. vehicle to vehicle comparison (n55:n55 is a fair assessment) ***

[hateface]

wow, that doesn't add up at all....I'm interested to see what the problem turns out to be

[sA x sKy]

What the hell? I'm curious to know how much I'm pulling with the tune alone then, if your numbers are that low.

[Sejo5]

Should you have been upped to +5 psi on the tune? your in Fl you should have 93 OCT. and are you on the new DME? If so +5 on the tune will allow for better performance with the following mods.

[rader1]

You should try some pulls with the jb removed. But your numbers look more like a healthy N5x rather than one with tune

[jdbretz]

What were your oil temps at when you dynoed? I don't know much about the N55 tunes, but for the N54 there is temperature protection to prevent running higher boost until oil temps reach a certain threshold. Other than that or having a boost leak, I have no clue. Too bad you weren't able to log it.

[s2k_335i]

i would have expected more from the N55. I wonder what the issues would be.

[D.B.S]

Originally Posted by Sejo5

Should you have been upped to +5 psi on the tune? your in Fl you should have 93 OCT. and are you on the new DME? If so +5 on the tune will allow for better performance with the following mods.

+1 I would have upped my boost to +4 or +5 for those runs (if your running 93 oct). I haven't ever dyno'd my X5, but I am running +5 without any issues on 93 oct here in NYC... Sticking to the stock limits is likely to be a detractor to your overall performance with the other mods you have... Try running the upper limits of what the Jb3 can provide... Not sure how expensive the runs are down there, but adjust and try again...

[Tuner1984]

The numbers your posted almost just seem like bolton numbers without a tune even though you have one. Before I upgraded to cobb, I had a JB+ with DCI that dynoed at 295 whp and 310 ft lbs of torque SAE Corrected. That was the JB+ at 50 percent.

[Cuffss]

this could be a multitude of things. You should log a few WOT runs on the street with the JB software.

[makarov88]

And this gentlemen is why you do not get the new DME update

[PaulBailey@ltbmw]

I think these numbers are pretty accurate...
Unfortunate... I know.

[D.B.S]

Originally Posted by makarov88

And this gentlemen is why you do not get the new DME update

If you are running stock (without a tune) it makes little sense to update the DME, but Terry stated that if you have the updated DME and you have the JB3 you will see good gains running at higher levels, +4 for 91 Oct, +5 for 93 Oct and +6 for race gas... IF the OP is still at 'ship' levels for the Jb3 tune, he's not running at the recommended levels with the new DME...

[tscdennab]

BMW techs seem to be holding up pretty well this time

[madmanhiker]

Originally Posted by Army335xi

+1 I would have upped my boost to +4 or +5 for those runs (if your running 93 oct). I haven't ever dyno'd my X5, but I am running +5 without any issues on 93 oct here in NYC... Sticking to the stock limits is likely to be a detractor to your overall performance with the other mods you have... Try running the upper limits of what the Jb3 can provide... Not sure how expensive the runs are down there, but adjust and try again...

yep, I run 93 here in Fla - but on the old DME so locked at +3.5psi. Still doesn't explain the low [low] numbers - especially at TQ.

No boost leak either.

[htoudiee]

Dammit... wth is going on with all N55s and not being able to make nice power?!!!

[madmanhiker]

Originally Posted by Cuffss

this could be a multitude of things. You should log a few WOT runs on the street with the JB software.

agreed and will comply.

[madmanhiker]

Originally Posted by makarov88

And this gentlemen is why you do not get the new DME update

this is WITHOUT the new DME update.

[D.B.S]

Hmmm Something isn't right... You don't have a baseline, or a dyno with just the exhaust to start with? Something is causing your issue...

Try doing a run without the tune and see if the numbers are the same or worse...
If the same then the tune isn't doing anything, if worse, then you know it's not the tune

You already know it's not your intake as that showed a definite decrease once removed

Check your DP, make sure it's leak free...
Maybe do a dyno with the stock DP and with the Vishnu DP and see if their is a change... (same options with the tune, if it's the same, it's the dp, if it's worse..) You get the picture.

IT's like working on a computer that isn't turning on. Check everything, even the simplest thing can be the problem...

[Brey335i]

Don't compare to the other cars there. Just go back without the mods and get a baseline at the same dyno. It's the only way to accurately deduce whether you're gaining the power you should be

[anerbe]

Originally Posted by Brey335i

Don't compare to the other cars there. Just go back without the mods and get a baseline at the same dyno. It's the only way to accurately deduce whether you're gaining the power you should be

I kind of agree with you. I understand what you are saying, but this is at the same dyno at the same time.

Pulling out the mods and retesting will show how much power the mods are adding, but this descrepancy vs. other cars is showing how much less power his car is putting to the wheels vs. others. even if the car is showing a 60hp improvement with mods, if he's running stock @ 240 crank vs. an N54 running 300 crank in the same exact place/time, I'd be pretty pissed off.

Different days / dyno, I 100% agree with your comment.

[shockin330i]

Someone needs to update their dme