[McLaren720s]

I'm looking for info on what a Stage 2 M2C (tune and downpipes) runs and traps in the 1/4 mile.

I did a single 1/4 mile run using draggy at an airstrip (non-prepped surface) and clocked 11.97 @ 119mph with a 2.01 60ft and a DA of 1528. Used Launch Control @ 2500rpm

0-60 mph came in at 3.76 with 1ft rollout.

Was really expecting better numbers and especially higher trap speed around maybe 122-124mph. Disappointing

Anyone else have numbers to share?

[Higgs Boson]

Well a 2.01 60ft is terrible and will kill your 1/4 time. That’s a lot of wheel spin.

Drive it correctly for a 1.65 60ft and your 1/4 mile will be 11.35

[McLaren720s]

Originally Posted by Higgs Boson

Well a 2.01 60ft is terrible and will kill your 1/4 time. That's a lot of wheel spin.

Drive it correctly for a 1.65 60ft and your 1/4 mile will be 11.35

Well, not much to drive "correctly". It's Launch Control. You release the brake and keep the throttle floored. Nothing really the driver can do.

Maybe a prepared drag strip would provide better traction and improve the 60ft

[AmooManiak]

Originally Posted by Higgs Boson

Well a 2.01 60ft is terrible and will kill your 1/4 time. That’s a lot of wheel spin.

Drive it correctly for a 1.65 60ft and your 1/4 mile will be 11.35

60 ft time has no baring on trap speed for RWD cars. If anything, bad launches usually result in slower ETs but better trap speeds. Better launches = better ETs and lower trap speeds.

[NISFAN]

I suspect a dynojet on STD smoothing was involved in setting the level of expectation here.

[Higgs Boson]

Originally Posted by McLaren720s

Well, not much to drive "correctly". It's Launch Control. You release the brake and keep the throttle floored. Nothing really the driver can do.

Maybe a prepared drag strip would provide better traction and improve the 60ft

Turn off launch control and drive the car.

Originally Posted by AmooManiak

60 ft time has no baring on trap speed for RWD cars. If anything, bad launches usually result in slower ETs but better trap speeds. Better launches = better ETs and lower trap speeds.

Never said anything about trap speed. I said ET. Also, a bad enough 60ft will lower trap speed also. What you are referring to is simply a small amount of wheel spin allowing rpms to be a bit higher earlier in the run helping mph.

A 2.01 60ft is on the extremely slow end of the range. My NHRA Super Stock car 60fts 1.3 and runs 9.7 with 580 hp. 2.01 is filled with wheel spin or very intrusive power limitation on any car.

[AmooManiak]

Originally Posted by Higgs Boson

Turn off launch control and drive the car.




Never said anything about trap speed. I said ET. Also, a bad enough 60ft will lower trap speed also. What you are referring to is simply a small amount of wheel spin allowing rpms to be a bit higher earlier in the run helping mph.

A 2.01 60ft is on the extremely slow end of the range. My NHRA Super Stock car 60fts 1.3 and runs 9.7 with 580 hp. 2.01 is filled with wheel spin or very intrusive power limitation on any car.

I'm not saying it's not a bad 60 ft time, but in his original post he was more concerned about ET, which has not a huge impact on the 60 ft time and the real measure of a car's power.

I do agree that I'd expect at least 125 MPH trap speed out of a Stage 2, with or without a bad launch.

[Higgs Boson]

Originally Posted by AmooManiak

I'm not saying it's not a bad 60 ft time, but in his original post he was more concerned about ET, which has not a huge impact on the 60 ft time and the real measure of a car's power.

I do agree that I'd expect at least 125 MPH trap speed out of a Stage 2, with or without a bad launch.

ET is most affected by 60ft time than anything else.

[Karmic Man]

What tyres, size and pressure were u using?

[TrentMeister]

Let some air out of the tires

[McLaren720s]

Originally Posted by Karmic Man

What tyres, size and pressure were u using?

Pilot Sport 4S - 275/30 front and 295/30 rear

Tire pressure 35

[Karmic Man]

4S’s dry grip is average, S007A has better dry grip when new. 35 psi is too high for drag, 295 not wide enough for drag at your power level

I would go 305 R888R or at least the S007A if you want a tyre that is usable in pouring rain

Then from there drop the tyre pressure to 25psi to start with and then experiment it further

You will have good results with the above setup

[Karmic Man]

Falken RT660 also has the 275/305 30 set so you may also want to consider sizing up to that tyre

[NISFAN]

Aren't you all missing the point? The OP's sig says he has 524whp, so close to 600hp crank, nearly 200 more than stock. It wouldn't matter if he had concrete rings as tyres, it should still trap well over 120mph.

[AmooManiak]

Originally Posted by NISFAN

Aren't you all missing the point? The OP's sig says he has 524whp, so close to 600hp crank, nearly 200 more than stock. It wouldn't matter if he had concrete rings as tyres, it should still trap well over 120mph.

Exactly my point. Too much emphasis is being put on the 60 ft and ET and not enough on the trap speed. He should be trapping at least 125 mph regardless of how bad his launch is, unless he totally bogs down.

[McLaren720s]

Originally Posted by AmooManiak

Exactly my point. Too much emphasis is being put on the 60 ft and ET and not enough on the trap speed. He should be trapping at least 125 mph regardless of how bad his launch is, unless he totally bogs down.

I felt like the LC did pretty solid outside of the fact that there was a huge delay after releasing the brake pedal.

I would like to reiterate that this was a single run, in the "real world", not a drag strip, using draggy in an area where the signal was cutting in and out so maybe it wasn't super accurate? Not sure.

Still, I'm surprised nobody else here has some actual numbers to compare to.
I would have thought that my trap speed would be around 124-125mph so maybe the dyno read high and not really making 520whp?! I believe uncorrected number was 490whp

I think the stock M2C traps around 114mph

[AmooManiak]

Originally Posted by McLaren720s

I felt like the LC did pretty solid outside of the fact that there was a huge delay after releasing the brake pedal.

I would like to reiterate that this was a single run, in the "real world", not a drag strip, using draggy in an area where the signal was cutting in and out so maybe it wasn't super accurate? Not sure.

Still, I'm surprised nobody else here has some actual numbers to compare to.
I would have thought that my trap speed would be around 124-125mph so maybe the dyno read high and not really making 520whp?! I believe uncorrected number was 490whp

I think the stock M2C traps around 114mph

You are right, they trap 116 or above. Making that extra power you should see around 125.

[Higgs Boson]

maybe if you could just humor us? set your rear pressure to 28, front to 40

turn off launch control and traction control etc, do a 5 second burnout out of the water (pull around the water if you can and back into the wet area but not the puddle so you don't get your front tires wet and drag water up to the starting line)

get the feel for what RPM to launch at and what rate to feed in the throttle, which could take several runs

try to get the 60ft down to 1.6 and see what your MPH comes up to without the nannies

you might be surprised how far down the track you actually get with the nannies enabled before they let the car have the full power

[McLaren720s]

Originally Posted by Higgs Boson

maybe if you could just humor us? set your rear pressure to 28, front to 40

turn off launch control and traction control etc, do a 5 second burnout out of the water (pull around the water if you can and back into the wet area but not the puddle so you don't get your front tires wet and drag water up to the starting line)

get the feel for what RPM to launch at and what rate to feed in the throttle, which could take several runs

try to get the 60ft down to 1.6 and see what your MPH comes up to without the nannies

you might be surprised how far down the track you actually get with the nannies enabled before they let the car have the full power

I am going to the drag strip as soon as the weather is clear here and I'll report back.

[ptper]

As many have said, the 60 foot could be better. What does everybody think of the DA? OP said it was run once, so i'm not thinking a heat soak or pulled timing issue. Do you mind sharing which tune?

[McLaren720s]

Originally Posted by ptper

As many have said, the 60 foot could be better. What does everybody think of the DA? OP said it was run once, so i'm not thinking a heat soak or pulled timing issue. Do you mind sharing which tune?

It's a Stage 2 tune from a local shop. It made comparable power on the dyno as another friend with BM3 Stage 2.

Heat soak shouldn't have been an issue because I wasn't driving the car hard before that

[ptper]

Originally Posted by McLaren720s

It's a Stage 2 tune from a local shop. It made comparable power on the dyno as another friend with BM3 Stage 2.

Heat soak shouldn't have been an issue because I wasn't driving the car hard before that

Thanks. I never put any credence to dyno numbers as opposed to real world data. Good on you for doing a pull. That trap is concerning though. Getting out out to the drag strip, especially a prepped track, should let you know better where you're at. Good luck!