X5M Wheel spin?

[infamousdiz]

Does anyone ever get wheel spin, I don't even in the rain. I have great new VRED 275 front and 315 rears tires but with 630hp and TQ with the tune I would expect some. did a few launches yesterday with wet roads and not a squeal. The car pulls like a beast almost scared to do it often worrying I will break a tranny or rear end ect. As my buddy said yesterday, this thing is like a ride at six flags.

[mhkm]

Disable DSC for cool four-wheel burnouts!
But that's about it.... no doughnuts or fishtails with this beast.

[MRV99]

Originally Posted by mhkm

Disable DSC for cool four-wheel burnouts!
But that's about it.... no doughnuts or fishtails with this beast.

You must need high horsepower to smoke an X5 with DSC OFF. I have tried it in the wife's 50i and it just launches without a hint of spin. The 275/315's are a lot of meat to try and break loose

[neliconcept]

I've broken loose my 4.8 on the wet and on dry, but not from a launch, just a good drift!

[mhkm]

You must need high horsepower to smoke an X5 with DSC OFF. I have tried it in the wife's 50i and it just launches without a hint of spin. The 275/315's are a lot of meat to try and break loose

From what I understood, he's talking about X5M (550hp stock). With a tune and DP's that's good for over 600hp easy (waiting for install!)

[infamousdiz]

Originally Posted by mhkm

From what I understood, he's talking about X5M (550hp stock). With a tune and DP's that's good for over 600hp easy (waiting for install!)

with down pipes and stage 2+ tuning 700HP easy

[mhkm]

with down pipes and stage 2+ tuning 700HP easy

Do you have these installed Diz?

[Rated M Roadster]

Originally Posted by infamousdiz

with down pipes and stage 2+ tuning 700HP easy

Not even close.

[infamousdiz]

Originally Posted by mhkm

Do you have these installed Diz?

for 24 hrs, much too loud for a daily driver

[infamousdiz]

Originally Posted by Rated M Roadster

Not even close.

why not? 700 at the fly wheel, without doubt. was not speaking at the wheels

[Rated M Roadster]

Originally Posted by infamousdiz

why not? 700 at the fly wheel, without doubt. was not speaking at the wheels

Stage 2 tunes don't even make 600 at the flywheel (most around 580); how would downpipes add another 100+?

[theaudir8fan]

this power number completely depends on how you are calculating it, however, most stage 2 tunes are rated at more than 600, usually 620 -640, unless you have a Dinan tune. With a catless downpipe and exhaust, the car can gain another 25-35whp, not sure if it's at 700, but I would reasonably believe 670+

as for wheel spin, it has never happened to me when accelerating in dry conditions, and I have catless+full exhaust

[infamousdiz]

Originally Posted by Rated M Roadster

Stage 2 tunes don't even make 600 at the flywheel (most around 580); how would downpipes add another 100+?

What shitty tune have you invested in?
http://velosdesignwerks.com/
their numbers are in the Miami heat

[infamousdiz]

Originally Posted by theaudir8fan

this power number completely depends on how you are calculating it, however, most stage 2 tunes are rated at more than 600, usually 620 -640, unless you have a Dinan tune. With a catless downpipe and exhaust, the car can gain another 25-35whp, not sure if it's at 700, but I would reasonably believe 670+

as for wheel spin, it has never happened to me when accelerating in dry conditions, and I have catless+full exhaust

670...close enough.... velos makes a stage 2+ (almost stage 3) tune for catless down pipes that I once put on

[Rated M Roadster]

Originally Posted by theaudir8fan

this power number completely depends on how you are calculating it, however, most stage 2 tunes are rated at more than 600, usually 620 -640, unless you have a Dinan tune. With a catless downpipe and exhaust, the car can gain another 25-35whp, not sure if it's at 700, but I would reasonably believe 670+

as for wheel spin, it has never happened to me when accelerating in dry conditions, and I have catless+full exhaust

Most stage 2 tunes do not see more than 600. See below...

Originally Posted by infamousdiz

What shitty tune have you invested in?
http://velosdesignwerks.com/
their numbers are in the Miami heat

The same tune you did, Velos.

Let's explore...

First, we have the graph, which is nearly identical to the advertised tune by AA. The difference being SAE vs STD correction.

AA -


Velos -


So let's look at the gains, including the ones advertised. We'll look at AA's graph in a spreadsheet:

[url=https://flic.kr/p/8S3EPK
AAX6mSWLog[/url] by
Active Autowerke, on Flickr

We'll focus on WHP. Stock, it shows a PEAK WHP of 454. With the tune it shows a PEAK WHP of 473. The key word here is PEAK, as in the amount gained at the highest HP rating. The gain of 86 WHP is NOT PEAK gains; it is in the mid range. Your actual PEAK gains are ~19 WHP. Now let's convert that to HP at the flywheel. If 454 WHP is stock and the S63 engine is rated at ~555 HP, that gives us a ~18% drivetrain loss. Let's take our WHP rating after the tune and apply that 18% drivetrain loss; we get 578 HP. Same applies to the Velos tune.

Where did you come up with 700!? Downpipes and a stage 2+ tune do not make over 120 HP.

[infamousdiz]

Originally Posted by Rated M Roadster

Most stage 2 tunes do not see more than 600. See below...



The same tune you did, Velos.

Let's explore...

First, we have the graph, which is nearly identical to the advertised tune by AA. The difference being SAE vs STD correction.

AA -


Velos -


So let's look at the gains, including the ones advertised. We'll look at AA's graph in a spreadsheet:

[url=https://flic.kr/p/8S3EPK
AAX6mSWLog[/url] by
Active Autowerke, on Flickr

We'll focus on WHP. Stock, it shows a PEAK WHP of 454. With the tune it shows a PEAK WHP of 473. The key word here is PEAK, as in the amount gained at the highest HP rating. The gain of 86 WHP is NOT PEAK gains; it is in the mid range. Your actual PEAK gains are ~19 WHP. Now let's convert that to HP at the flywheel. If 454 WHP is stock and the S63 engine is rated at ~555 HP, that gives us a ~18% drivetrain loss. Let's take our WHP rating after the tune and apply that 18% drivetrain loss; we get 578 HP. Same applies to the Velos tune.

Where did you come up with 700!? Downpipes and a stage 2+ tune do not make over 120 HP.

this "data" and "facts" are erroneous on all accounts. Maybe you are correct, and by maybe I mean you are. the TQ is through this roof though.

[theaudir8fan]

Rated M Roadster hence why I said depends on how it's calculated, the way you are doing it is proper, however, most of these tunes are advertised at 620-640HP. In terms of how accurate this is, it's very hard to tell. But at the same time, BMW have been known to underrate the engine output from the factory, and the stock 555HP isn't necessarily accurate either. I think we should settle for the advertised power output to operate on a equal/reasonable basis, as for accuracy of power rating, it will change depending on the exact car, the configuration, the location, the weather, and many more

[mrmomo313]

OP with Traction control turned all the way off and using launch control it is easily possible to to break traction at all 4 wheels. My friend is able to do it on his bone stock x5m with LC, and with the power I'm making it happens on cooler nights quite a bit. Most of the time it hooks pretty well with minimal wheel spin though