[sd390r]

dtc off or full dsc off?

rev to what?

[BoostedCosta]

i would like to know to
what i have been doing is reving at 2500 rpms with dsc fully off....so im not sure if thats the best way

[Bimmer Nerd]

put the car in manual, turn DTC off and rev up to MAX of 4000 RMP , 4000 its still too much and it might give you a lot of tire spin, so i recommend around 2000 rpm and then floor it on the GREEN !!!!! good luck

[Bimmer Nerd]

Originally Posted by 335i82108

i would like to know to
what i have been doing is reving at 2500 rpms with dsc fully off....so im not sure if thats the best way

my bro usually turns DTC off and not DSC, 2500 RPM is pretty reasonable rev and it should give you no tire spin and pretty reasonable launch !!

[BoostedCosta]

Originally Posted by godora

my bro usually turns DTC off and not DSC, 2500 RPM is pretty reasonable rev and it should give you no tire spin and pretty reasonable launch !!

ill try it with dtc on only but when i usually have dtc on the car tends to bitch out lol...and i think for you its a lot easier since u have at right? i have mt

[sd390r]

what im doing is DTC off (dsc still on) reving to about 3... slowly let the clutch go, let it catch, then pedal to the floor... sound about right

[BoostedCosta]

Originally Posted by sd390r

what im doing is DTC off (dsc still on) reving to about 3... slowly let the clutch go, let it catch, then pedal to the floor... sound about right

yea thats about right thats the technique i use except i have dsc fully off

[sd390r]

dsc fully off gives me CRAZY tire spin it consumes the entire first gear... to fight that i gotta let off the clutch so slowly it kills too much time... i find its easier with just DTC off... unless im doing something wrong

[BoostedCosta]

well do u heat up the tires that helps me aalot and try reving it at 2500
u could be right im probably the one that wrong and doing something wrong

[sd390r]

it sounds stupid but EVERY video i see on youtube of 335s going 0-60 in 4.0-4.1 etc has the DTC light on so thats probably how im gonna keep it.... also.... do you all bring it to redline before you shift? max hp is said to be 5800rpm so why bring it to 7

[BoostedCosta]

ooo ok so i guess your right..i just assumed that with traction completely off that it would give u the best hook but i assumed wrong..i have to try lunching the car with dtc only

[nicknaz]

Originally Posted by sd390r

dsc fully off gives me CRAZY tire spin it consumes the entire first gear... to fight that i gotta let off the clutch so slowly it kills too much time... i find its easier with just DTC off... unless im doing something wrong

whoa. don't do that. You are wearing out the clutch big time with WOT launch and big clutch slip

[BoostedCosta]

Originally Posted by Nick Nazareno

whoa. don't do that. You are wearing out the clutch big time with WOT launch and big clutch slip

isnt that what you have to do for a good launch. because you cant just dump the clutch

[sd390r]

i mean is there any way to launch without wearing out the clutch realistically... either dump it out get loads of spin or slowly let up until it catches and then pedal down... either way seems damaging to me

[mistermojorizin]

Originally Posted by sd390r

it sounds stupid but EVERY video i see on youtube of 335s going 0-60 in 4.0-4.1 etc has the DTC light on so thats probably how im gonna keep it.... also.... do you all bring it to redline before you shift? max hp is said to be 5800rpm so why bring it to 7

regarding your shifting question: you want to maximize engine power, but shifting right after the peak will drop you too low in the next gear, so you actually will have a lot less hp there than if you stayed in the previous gear past its peak. does that make sense?

if so, the next thing to understand is that based on the gear ratios, when you shift from 1-2 it drops you in a diffirent rpm in 2nd gear than say when you shift from 2-3 (ex: say you shift at 6,000 rpm in 1st you end up at, just for sake of argument, at 4,500 rpm in 2nd; but if you shift at 6,000 rpm in 2nd you don't necessarily end up at the same 4,500 rpm in 3rd). So shift points are diffirent from gear to gear.

i have hear that in 1st and 2nd its optimal to redline and in 3rd its optima to shift around 6700 and in 4th aroun 6400. I've looked at the graphs and that makes sense. shifting any sooner than that drops you in lower hp than you would get than if you stayed in the lower gear (even though both numbers are less than peak).

the other way of looking at it is through torque multiplication to see what force is applied to the ground and maximizing that force. but no matter which way you go, engin hp or gear mulplied torque, you find the optimal shift points are the same.

[jerrybajwa]

well i have a steptronic and i get better launches when i do it with the dtc light on....(the one where u just press it once) it seems to work better for me than it completely off because when i launch with complete off theres alot of wheelspin

[nicknaz]

Originally Posted by 335i82108

isnt that what you have to do for a good launch. because you cant just dump the clutch

Personally, I would modulate the throttle (with the clutch fully engaged) to avoid wheelspin rather than slip the clutch excessively

[sd390r]

so general consensus is rev to between 2500-2800 with only DTC disabled (dsc still acting) and slip the clutch?

also +1 to mrmojo very informative post on when to shift...

[whytboy]

is it true that the more engine mods you have the lower you launch point gets?
for example i have catless dp's exhaust and JB3.. i feel as if 2500 is way to much

[scollins]

Originally Posted by sd390r

so general consensus is rev to between 2500-2800 with only DTC disabled (dsc still acting) and slip the clutch?

also +1 to mrmojo very informative post on when to shift...

You've got your DSC/DTC/OFF all confused friend. It goes like this:

DSC - Dynamic Stability Control. Default is ON. This is the most aggressive setting for the computer to step in and take over.

DTC - Dynamic Traction Control. Default is OFF, because DSC is ON. Pressing the "DTC" button once briefly turns on DTC. This setting partially disables some of the DSC intervention and will allow a little more wheel slip before stepping in and taking control. When you see "DTC" on the dash, that means that DTC is ON, and DSC is reduced. So DTC is like a more forgiving DSC.

OFF (Triangle with exclamation and arrow-circle) - All systems are OFF. DSC is OFF, DTC is OFF. You will notice that most posts in the General E9X forum about crashes will reveal that DSC and DTC were both OFF

Anyway, try launching under each setting with the same conditions. Something like:
DSC ON: Rev to 2500 and go. Notice lack of wheel spin and/or heavy intrusion of DSC.

DTC ON (one button push): Rev to 2500 and go. Notice some wheel spin, but also that the system will jump in at some point.

DSC/DTC OFF (cool triangle symbol, long button push/hold): Rev to 2500 and go. Notice how you are bouncing off the rev limiter and going about 20 MPH because one of your rear tires is going up in smoke.

[iheartsole]

sounds good!

[pittyinSC]

The good thing about the N/A cars is we can launch with it all
the way off!! My car is really slow though so doesnt matter all that much

No torque= win lol jk jk