MHD stage 1 1/4 mile times

[iManu]

What are stage 1 MHD fully stock car times for the N55? And also, is it true that the burble will destroy the cat?

[The Wind Breezes]

I can't answer either question, but my advice is to remove the cat. It's not that big of a deal and you will love the increased sound and performance. You don't even have to spend money on a downpipe, you can get someone stock downpipe for like $100 shipped on the classifieds, knock the goodies out and sell them to a recycler. You might want to do that in front of them so they know it came from a BMW (they'll pay more for cats from higher end / high performance cars). Bingo, ultra cheap catless downpipe. That's what I did anyway.

If you want a 1/4 mile time, your best bet is to take the car to a dragstrip or download a 1/4 mile app on your phone. Make sure to properly calibrate it and do a few runs stock to establish a baseline. Then you can see gains. Logs aside, there is surprisingly little hard data on the performance of the MHD tune.

[greenthumb]

I was planning to go to a test & tune this Friday until somebody hit my car in the parking lot at work. I'll be sure to post my results when I get the car back from the body shop and can make it out to the strip.

For sure unburnt fuel igniting in the exhaust system isn't great for the cat. But since BMW put a burble feature in their PPK tune, you can rest assured it will take at least 4 years (BMW warranty period) to ruin your cat. If it makes you nervous, just turn it off.

[gtjosh]

I have N55 and a stage 1 MHD tune. I took my car to the track the other night and ran a 13.2 ... :/ It was hot as balls that night and pretty humid. I only got two run in and there was alot of down time in between. I know without a doubt I could have got into the 12s if I had a few more passes. Temp was in the mid 80s and humidity was around 60%.

[The Wind Breezes]

Originally Posted by greenthumb

But since BMW put a burble feature in their PPK tune

Burbles are not created equal. The amount of fuel you can dump, and the time you can dump it for could vary hugely. I don't know how much MHD dumps in or for how long, but this reasoning that BMW uses it is not sufficient to say that it's OK for the cat or not.

Originally Posted by gtjosh

I took my car to the track the other night and ran a 13.2

Tell us your trap speed, that's the important part. The time is more or less totally irrelevant to how much power the car is making.

[gtjosh]

My trap speed was 110

[iManu]

With DP, Chinese cheap intercooler, 2012 135i DCT I did 12.6 with 1.993/60 foot and 107.78mph trap. Very pleased. The trick is, don't rev to the maximum if you have normal tires, try to let go of the brake when you hit 2900-3000rpm, with beteer tires, you can launch at full rpm.

[TwistedDrum5]

Originally Posted by emmanuel.yoo

With DP, Chinese cheap intercooler, 2012 135i DCT I did 12.6 with 1.993/60 foot and 107.78mph trap. Very pleased. The trick is, don't rev to the maximum if you have normal tires, try to let go of the brake when you hit 2900-3000rpm, with beteer tires, you can launch at full rpm.

Hows the cheap IC working for you? Would you buy again?

[The Wind Breezes]

Has anyone raced the car with kickdown (dct launch) disabled?

[iManu]

Originally Posted by TwistedDrum5

Hows the cheap IC working for you? Would you buy again?

To be honest, for 300$ it's the best quality price intercooler! I can run stage 2+ without any trouble, the only thing is it will heat soak pretty fast, so overs 230kmh i feel the car is getting a little sluggish!

[iManu]

Originally Posted by The Wind Breezes

Has anyone raced the car with kickdown (dct launch) disabled?

I tried, and it's bad because the DCT has a slight delay so the wheel will start spinning for no reason. The best is to use launch control and let the brakes off at 2000rpm if you have regular race tires like MPSS.

[Jdbwizzard]

I am running MHD stage 2+ With DP,IC,and CP w/ stock DV and only trapping 103MPH or less. I am thinking this is low. I know my peak boost is around 17.7 but not sure if this is normal.

[Mark Aubele]

Originally Posted by The Wind Breezes

Has anyone raced the car with kickdown (dct launch) disabled?

I took my wife's DCT car (E30 tune, downpipe, stock IC at the time) and couldn't get LC to engage. It was maddening. Fucker wouldn't 60' to save it's life, best time was a 12.8@112 with a 2.3 60'. Didn't have tire pressure monitors in her track wheels (she TT/hillclimbs it), only reason I could see it not working. Never really used it at the hills starting line doesn't have much traction.

I had tried the LC on the street before and didn't have an issue with it working, but never tried it with these wheels and tires on the car.

[mfindigital]

Originally Posted by Mark Aubele

I took my wife's DCT car (E30 tune, downpipe, stock IC at the time) and couldn't get LC to engage. It was maddening. Fucker wouldn't 60' to save it's life, best time was a 12.8@112 with a 2.3 60'. Didn't have tire pressure monitors in her track wheels (she TT/hillclimbs it), only reason I could see it not working. Never really used it at the hills starting line doesn't have much traction.

I had tried the LC on the street before and didn't have an issue with it working, but never tried it with these wheels and tires on the car.

Maybe you disabled the kick down in MHD? It seems like you lose launch control if you do. I spent about 10 min trying to figure out why I couldn't get in launch mode, then realized that switch for kickdowns is also the switch for launch control.

[Mark Aubele]

Originally Posted by mfindigital

Maybe you disabled the kick down in MHD? It seems like you lose launch control if you do. I spent about 10 min trying to figure out why I couldn't get in launch mode, then realized that switch for kickdowns is also the switch for launch control.

Damn, I do. Thank you so much for the tip!

[2WheelDave]

So on a bone stock car, what is the consensus on the Stage 1 MHD tune? Worth the money? I've seen some dyno pulls on this board somewhere that as I recall indicate that the actual power gains are fairly modest.

[Soterios]

Originally Posted by 2WheelDave

So on a bone stock car, what is the consensus on the Stage 1 MHD tune? Worth the money? I've seen some dyno pulls on this board somewhere that as I recall indicate that the actual power gains are fairly modest.

I'm not sure you're going to get a great answer. There's like six dyno graphs across thousands of members here. 99% of your answers will be "butt dyno" graphs. If you trust MHD, then there is a significant power gain from stage one.

I have Cobb, but the stage 1 didn't feel all that different to me. Stage 2+ on the other hand felt a lot different.

[The Wind Breezes]

Originally Posted by 2WheelDave

So on a bone stock car, what is the consensus on the Stage 1 MHD tune? Worth the money?

If you want the car to be faster and more powerful and have no top speed limiter, it's definitely worth the money. If you're an old lady or something it would probably be a waste of money.

The question is, are you an old lady?

[mfindigital]

Originally Posted by 2WheelDave

So on a bone stock car, what is the consensus on the Stage 1 MHD tune? Worth the money? I've seen some dyno pulls on this board somewhere that as I recall indicate that the actual power gains are fairly modest.

I'd guess it's a minimum of 25whp on stage 1 (on 91 gas). I dynoed 317whp 395 tq stage 2 MHD with catless dp.

[dizzy619]

I have full maps and there are advantages at all the settings depending on conditions and what you want from the car.. Stage 2+ is mad compared to stage 2 which doesn't seem that much faster than 1+ but it has different features... Any of the upgrades are worth it. IMHO