[jonahk]

Originally Posted by McLaren720s

I believe TheStraightPipes were told by BMW engineers at a driving event that for best results Launch Control should be held for another 3 seconds or so after it says "Launch Control Active" as it takes a bit to build full boost.

Not sure what kind of difference this will really make if any, but I intend to find out once my car is broken-in and go to the drag strip.

Interesting - the technical manual says to release the brake within 3 seconds of activating launch control. NCG80M3 posted a video where he was sitting in launch control for longer than that and he was getting much slower 0-60 times as a result.

I haven't been able to launch my G80 because I'm still in break-in, but watching other videos it seems the RPMs go right to a specific point and pretty much sit there. I would assume that BMW engineers picked that rpm to where the car is building optimum boost but maybe it only holds it for a set period of time?

[SickGTR]

Originally Posted by jonahk

Interesting - the technical manual says to release the brake within 3 seconds of activating launch control. NCG80M3 posted a video where he was sitting in launch control for longer than that and he was getting much slower 0-60 times as a result.

I haven't been able to launch my G80 because I'm still in break-in, but watching other videos it seems the RPMs go right to a specific point and pretty much sit there. I would assume that BMW engineers picked that rpm to where the car is building optimum boost but maybe it only holds it for a set period of time?

Could make sense. I never use to hold long on the GTR. Floor it, ramp right to 4500 RPM and go! Could be a safety thing on the BMW so some idiot can't just sit there with the car loaded up

[jonahk]

Originally Posted by SickGTR

Could make sense. I never use to hold long on the GTR. Floor it, ramp right to 4500 RPM and go! Could be a safety thing on the BMW so some idiot can't just sit there with the car loaded up

I miss the adjustable RPM from the F8x series with the DCT.

[SickGTR]

Originally Posted by jonahk

I miss the adjustable RPM from the F8x series with the DCT.

Yes! I use to always mess with diff launch RPM when I was at the track. Seems like forever ago. It's only Rolling Launch now

[Lady Jane]

Originally Posted by Imran@Evolve

Have you visited the UK

I hope to drop-by and see you in person when all the travel restrictions are lifted. I have family in Ireland and Scotland so a quick detour to visit your shop is on my bucket list. if it's okay with you.

[EvenKeel]

Originally Posted by McLaren720s

I believe TheStraightPipes were told by BMW engineers at a driving event that for best results Launch Control should be held for another 3 seconds or so after it says "Launch Control Active" as it takes a bit to build full boost.

Not sure what kind of difference this will really make if any, but I intend to find out once my car is broken-in and go to the drag strip.

Lot of stress on the ZF 8HP with all the holding.

[vetteflier]

Originally Posted by Ximian

"26 [Celsius] ambient"
...
"It was very hot"

79 F is 'very hot'? Uhhhh....

[vetteflier]

Max torque comes on at 2750 and stays flat to ~ 6000. It would seem launch control would hold above that rpm. I think boost would build in less than a second, otherwise it wouldn't be max torque.

[AndrewC1989]

Originally Posted by vetteflier

79 F is 'very hot'? Uhhhh....

It's almost as if people from different parts of the world share different experiences and perspectives

[NCG80M3]

Originally Posted by jonahk

Interesting - the technical manual says to release the brake within 3 seconds of activating launch control. NCG80M3 posted a video where he was sitting in launch control for longer than that and he was getting much slower 0-60 times as a result.

I haven't been able to launch my G80 because I'm still in break-in, but watching other videos it seems the RPMs go right to a specific point and pretty much sit there. I would assume that BMW engineers picked that rpm to where the car is building optimum boost but maybe it only holds it for a set period of time?

Once I get this nail out of my tire I plan to try launching again without waiting to see how it compares.

[The Dad]

Originally Posted by Imran@Evolve

Have you visited the UK

26c like an average day here in Sydney Oz, 🥵 hot is 10-15 degrees higher :

[NISFAN]

Drag launch is where the ZF8 really excels. It doesn't have a clutch to disconnect the power flow. Instead you have the engine fighting the brakes, during that two pedal push launch, which loads the engine heavily. This definitely builds start line boost in a way the DCT just couldn't.

Imran, it sounded like the car did some double gear changes in quite a few of the runs, but not all. I think you commented on a strange shift. Was it double shifting?

[jonahk]

Originally Posted by NISFAN

Drag launch is where the ZF8 really excels. It doesn't have a clutch to disconnect the power flow. Instead you have the engine fighting the brakes, during that two pedal push launch, which loads the engine heavily. This definitely builds start line boost in a way the DCT just couldn't.

Imran, it sounded like the car did some double gear changes in quite a few of the runs, but not all. I think you commented on a strange shift. Was it double shifting?

Yea what was that all about? I heard it on at least two runs and I could tell from Imran@Evolve 's expression that wasn't expected. Definitely interested in learning more what this car does under full load (damn break in miles)

[Sbm007]

Originally Posted by PLife

My understanding is launch control totally builds boost in BMWs. Thsts why it shows “preparing launch control” before its fully active. Im gonna have to play around and report back in a couple months when i can do it

Interesting... this is how the Audi launch control system works, you hold it after LC is active and you can see the boost bar fill up.

[Imran@Evolve]

Originally Posted by Lady Jane

I hope to drop-by and see you in person when all the travel restrictions are lifted. I have family in Ireland and Scotland so a quick detour to visit your shop is on my bucket list. if it's okay with you.

Sure - happy to have people over.

[Imran@Evolve]

Originally Posted by NISFAN

Drag launch is where the ZF8 really excels. It doesn't have a clutch to disconnect the power flow. Instead you have the engine fighting the brakes, during that two pedal push launch, which loads the engine heavily. This definitely builds start line boost in a way the DCT just couldn't.

Imran, it sounded like the car did some double gear changes in quite a few of the runs, but not all. I think you commented on a strange shift. Was it double shifting?

I didn't have a cam on the dash put I don't believe it was double shifting. It changes shift points depending on grip. Once the tyres were warm it was very consistent time wise for a RWD car.

[PLife]

Originally Posted by Imran@Evolve

I didn't have a cam on the dash put I don't believe it was double shifting. It changes shift points depending on grip. Once the tyres were warm it was very consistent time wise for a RWD car.

Yeah my Aston (zf 8hp75) short shifted on launches also but usually 1-2 not 2-3 (or 3-4) cant remember which one you had. But thats crazy because that means the bmw was spinning in higher gear its a beast. How good is the surface on that track it look pretty sticky but just curious. I recall you mentioning its not great

[Imran@Evolve]

Originally Posted by PLife

Yeah my Aston (zf 8hp75) short shifted on launches also but usually 1-2 not 2-3 (or 3-4) cant remember which one you had. But thats crazy because that means the bmw was spinning in higher gear its a beast. How good is the surface on that track it look pretty sticky but just curious. I recall you mentioning its not great

It is sticky but sometimes that doesn't help with a standard road tyre. I thought the car was launching very well for a RWD car based on my experience with the F80 which is impossible to launch well.

[XsltAnalyst]

Originally Posted by Ximian

"26 [Celsius] ambient"
...
"It was very hot"

average high/low for July is 71/55 F there, so 78F will be "very hot" for a person living there.

[vetteflier]

Originally Posted by AndrewC1989

It's almost as if people from different parts of the world share different experiences and perspectives

Our Brit friends should come and visit Houston in July...or Phoenix--after all, it's a dry heat there...

[dazzapb]

to be fair in the south of the UK summers days are normally 75f - in the last few decades they have been recently 'hot' 90f is pretty common - and in London last year we had a few 100f days with 6 days over 95f in a row.

at the moment its crap - jet stream is buggered by the insane heat in the pacific north west so they say. Can't imagine 50c

i'm a part time weather man due to almost daily cycling, not a fan of wet weather rides

[stylinexpat]

122 MPH are good numbers. I want one day