[COM40]

Let's say with UHP all seasons and not using launch control. Just a hard, full throttle acceleration from a roll.

Roughly how much power and what "stage" tune would let you chirp the tires purely from acceleration?

[AshtonPJT]

Originally Posted by COM40

Let's say with UHP all seasons and not using launch control. Just a hard, full throttle acceleration from a roll.

Roughly how much power and what "stage" tune would let you chirp the tires purely from acceleration?

Probably around 500-600, the issue is these cars have a slight delay in power without launch/brake boost/antilag so really depends on the tune and how they have torque set.

[ASAP]

Originally Posted by AshtonPJT

Probably around 500-600, the issue is these cars have a slight delay in power without launch/brake boost/antilag so really depends on the tune and how they have torque set.

I think you are absolutely right... i think this was done to get an easier launch in and prevent the tires from spinning...

the x3m is completely different and can spin the tires off launch even stock but that's just by design - narrower rear tires, a firmer suspension and a more aggressive launch control... it's also able to spin the tires with less torque at a lower RPM somehow... but again, it's made to lose traction and slide by default as it is an M car... whereas the M40i priorities traction and safety over everything

[BobFriend]

Doesn’t the X3M have a stronger rwd bias?

[AshtonPJT]

Originally Posted by BobFriend

Doesn’t the X3M have a stronger rwd bias?

Yes
Also better engine, better trans, better diffs. Also stiffer suspension.

[Oldgixxer]

Originally Posted by ASAP

I think you are absolutely right... i think this was done to get an easier launch in and prevent the tires from spinning...

the x3m is completely different and can spin the tires off launch even stock but that's just by design - narrower rear tires, a firmer suspension and a more aggressive launch control... it's also able to spin the tires with less torque at a lower RPM somehow... but again, it's made to lose traction and slide by default as it is an M car... whereas the M40i priorities traction and safety over everything

Agreed. When it had the stock Conti's with about 2/3 tread left if I used L/C on asphalt it'd light all 4 tires up around 4k rpm until it shifted to 2nd and would continue to roast all 4 until it shifted to 3rd or I let off. This was after a piggyback though;bone stock it'd spin using L/C initially then hook. It was hit or miss. With the PS4S it still spun but not as dramatically as it did w the Conti's

Concrete roads offered better grip as expected but it still lit em up w the piggyback using L/C

[COM40]

Originally Posted by Oldgixxer

Agreed. When it had the stock Conti's with about 2/3 tread left if I used L/C on asphalt it'd light all 4 tires up around 4k rpm until it shifted to 2nd and would continue to roast all 4 until it shifted to 3rd or I let off. This was after a piggyback though;bone stock it'd spin using L/C initially then hook. It was hit or miss. With the PS4S it still spun but not as dramatically as it did w the Conti's

Concrete roads offered better grip as expected but it still lit em up w the piggyback using L/C

Based on your sig it seems to be the X3M you're referring to?

[COM40]

Originally Posted by AshtonPJT

Probably around 500-600, the issue is these cars have a slight delay in power without launch/brake boost/antilag so really depends on the tune and how they have torque set.

Is that delay designed to improve mechanical longevity or is it just a side effect of the factory tuning?

[AshtonPJT]

Originally Posted by COM40

Is that delay designed to improve mechanical longevity or is it just a side effect of the factory tuning?

I’d say neither just how engines work. You can’t expect instant power just simple stomping on the pedal. The engine has to rev up,spool the turbo, and much more. That why we all use launch control because it allows the revs and turbo to spool off the line. Below are draggy launching the car and just full throttle off the line . Look at the G’s you can see how the car is responding differently. This was a simple launch bring rpm to 2k with about 5 pounds of boost so nothing crazy.(taking it easy on launches until I get my diff bolt fix) and to add on it’s a 4500lb car with AWD and good weight transfer so it’ll be hard to spin the tires without launch control. I’ve tried to spin mine in the rain aswell and it just grips and goes.

[Oldgixxer]

Originally Posted by COM40

Based on your sig it seems to be the X3M you're referring to?

Correct

[NYRangers79]

Xdelete, rwd mode, stock power levels. You are good to go. Otherwise I was able to spin all 4 tires on stage 2+ with balding tires.

[ASAP]

Originally Posted by AshtonPJT

I’d say neither just how engines work. You can’t expect instant power just simple stomping on the pedal. The engine has to rev up,spool the turbo, and much more. That why we all use launch control because it allows the revs and turbo to spool off the line. Below are draggy launching the car and just full throttle off the line . Look at the G’s you can see how the car is responding differently. This was a simple launch bring rpm to 2k with about 5 pounds of boost so nothing crazy.(taking it easy on launches until I get my diff bolt fix) and to add on it’s a 4500lb car with AWD and good weight transfer so it’ll be hard to spin the tires without launch control. I’ve tried to spin mine in the rain aswell and it just grips and goes.

whats your 1/4 mile trap w 430 whp? also is that on pump gas?

[AshtonPJT]

Originally Posted by ASAP

whats your 1/4 mile trap w 430 whp? also is that on pump gas?

I think around 109-112 I think but Florida heat kills everything top end.

That was e30 stock hpfp so had to keep everything happy as well.

Now I’m running 117 of my e85 base map low boost and timing making probably around 450 whp.

I don’t live near any e85 2 hours every direction😡 so bought 10 gallons and used 5 so far but sadly ran out of time to dial in my car so that’s the test hit off my log.

Car is a totally different monster on e85

[ASAP]

Originally Posted by AshtonPJT

I think around 109-112 I think but Florida heat kills everything top end.

That was e30 stock hpfp so had to keep everything happy as well.

Now I’m running 117 of my e85 base map low boost and timing making probably around 450 whp.

I don’t live near any e85 2 hours every direction�� so bought 10 gallons and used 5 so far but sadly ran out of time to dial in my car so that’s the test hit off my log.

Car is a totally different monster on e85

Yea, this is a perfect example of why I don't want to mod this car... it just doesn't yield decent enough results. E85 is too much of a hassle, not available everywhere and i don't want to measure mixes. I played that game with my old 335i. 112 trap is decent for an suv but still slow overall lol... 117 is faster but that's barely stock X3M numbers... i think i am looking to pickup an m4 as a second car to get something that can go above 125 w just a basic tune... my 2007 335i w a procede and e85 ran a 12.0 @ 120... 12 years ago lol.

[AshtonPJT]

Originally Posted by ASAP

Yea, this is a perfect example of why I don't want to mod this car... it just doesn't yield decent enough results. E85 is too much of a hassle, not available everywhere and i don't want to measure mixes. I played that game with my old 335i. 112 trap is decent for an suv but still slow overall lol... 117 is faster but that's barely stock X3M numbers... i think i am looking to pickup an m4 as a second car to get something that can go above 125 w just a basic tune... my 2007 335i w a procede and e85 ran a 12.0 @ 120... 12 years ago lol.

What year is your car?

[ASAP]

Originally Posted by AshtonPJT

What year is your car?

2023... so Lci... would need to femto for the real fun.

[AshtonPJT]

Originally Posted by ASAP

2023... so Lci... would need to femto for the real fun.

Ah 2023 should have more room to play vs the gen 1 cars.

[Rottweiler]

Originally Posted by ASAP

2023... so Lci... would need to femto for the real fun.

HNL to Helsinki is a lot farther and still wasn’t too much of a headache

[suby01]

A bit more than tree fiddy.