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Dmac @ BMS/DMD's Avatar
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Default N54 Single Turbo 1/4 Mile Launch Discussion - 02-11-2015, 10:05 PM

So what is looking to be the best way to launch one of these with the auto transmission?

Launch in first with heavily limited boost in first and second and short shift into third?

Launch in second and brake boost HARD?

Just kind of curious what everyone has had success with.


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Default 02-11-2015, 10:10 PM

I don't have a big single but 2nd gear launching just makes a lot more sense. Longer gears are great for big power cars. Good weight transfer set up and sticky azz tires


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Default 02-12-2015, 06:33 AM

Quote:
Originally Posted by dmacpro91
So what is looking to be the best way to launch one of these with the auto transmission?

Launch in first with heavily limited boost in first and second and short shift into third?

Launch in second and brake boost HARD?

Just kind of curious what everyone has had success with.
I'll be going to the local strip this weekend to figure this out.
Just hope the trans holds up.
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135pats 135pats is offline
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Default 02-12-2015, 07:42 AM

I only tried one launch and rarely launch the car regardless, but coming into 3rd it wanted to blow the tires off in a major way. This was a 2nd gear launch.

Bottom line: it's hard to get the big singles + 6AT to get out of the hole.

NOS!
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Default 02-12-2015, 08:15 AM

A bit off topic but does anyone have a list of the say top 5 quickest/fastest 1/4mile ST cars out there (aside Shivs)?

Thanks,
Rob
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Default 02-12-2015, 08:39 AM

I found that its completely pointless to practice launches on the street and try to apply the same technique to the tack, on the street car does a huge burn out, but hooks like a son of a bitch on a prepped track…so that’s that


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Default 02-12-2015, 09:05 AM

Even though I'm 6mt, I feel like starting in second with a single will always be better. I was gonna give it a shot becuase I've found 1st has always been too short and just spins, especially when making more power with a single and not even having a gear long enough to build full boost..


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Stucks Stucks is offline
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Default 02-12-2015, 09:56 AM

Quote:
Originally Posted by Rob@RBTurbo
A bit off topic but does anyone have a list of the say top 5 quickest/fastest 1/4mile ST cars out there (aside Shivs)?

Thanks,
Rob
Aside from shivs car, there are only 2 single turbo guys i am aware of who have hit the quarter mile.

I know a guy in florida named matt had a proven power kit 6at car and theres a vid of him going 13.0 @ 120 mph. 19-20 psi, conservative timing, hta3586r, easing it out of the hole from 2nd gear it seems. on street tires.

https://www.youtube.com/watch?v=UCWBpm8GYAI

Also, Dan (ak335i) has been mid 12s with a high 120s mph trap speed, and currently holds the trap speed record with 133mph. 12.8 @ 133mph with a 2.7 60 ft. proven power 6466, 6at, street tires. picking up 33 mph on the back end is pretty huge though. def making some serious power.



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Default Holy Thread Revival Batman! - 07-30-2017, 06:44 PM

Now that people have had some time to try different things, how are the ST 6AT people doing over the 1/4?

I did a 12.7 at 17psi brake boosting in 1st a few weeks ago. I have my Meth kit working now so going to start playing with the anti-lag to see what sort of boost I can make on the line.


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Default 07-31-2017, 03:36 AM

I see this was an old thread but I'd be interested to see how things have progressed in the last 2 years. It must be pretty frustrating to suffer so much from a dig.

I guess now you guys have more twin scroll options. I thought a 1st gear launch would be best to get the rpms up as fast as possible to drive the turbine but I never considered the brake boosting. I thought the 2nd gear launches are best for those people struggling for traction in 1st.

I'm European so a single setup wasn't an option. I have a DCT as well so brake boosting isn't possible. I tried launching my stock twins in 2nd from idle and it was painful how slow the launch and spool up was. But as I say idle launch from 0 boost. Still on twins though. You'd want some kind of 2 step but in an auto I guess that's not possible yet. Maybe with some TCU coding. Who knows what could happen?


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N54QC N54QC is offline
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Default 07-31-2017, 02:50 PM

Quote:
Originally Posted by AWSAWS
I see this was an old thread but I'd be interested to see how things have progressed in the last 2 years. It must be pretty frustrating to suffer so much from a dig.

I guess now you guys have more twin scroll options. I thought a 1st gear launch would be best to get the rpms up as fast as possible to drive the turbine but I never considered the brake boosting. I thought the 2nd gear launches are best for those people struggling for traction in 1st.

I'm European so a single setup wasn't an option. I have a DCT as well so brake boosting isn't possible. I tried launching my stock twins in 2nd from idle and it was painful how slow the launch and spool up was. But as I say idle launch from 0 boost. Still on twins though. You'd want some kind of 2 step but in an auto I guess that's not possible yet. Maybe with some TCU coding. Who knows what could happen?
Did you ever try launching with anti lag?


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Default 08-01-2017, 05:46 AM

Quote:
Originally Posted by N54QC
Did you ever try launching with anti lag?
No not on a DCT. Don't think it's an option.


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Default 08-01-2017, 11:14 AM

Quote:
Originally Posted by Dmac @ BMS/DMD
So what is looking to be the best way to launch one of these with the auto transmission?

Launch in first with heavily limited boost in first and second and short shift into third?

Launch in second and brake boost HARD?

Just kind of curious what everyone has had success with.
Brake boosting is the only option right now. However, from a hardware perspective the transmission can support a transbrake function. There would need to be an add-on box as well as flash updates to take advantage of this via xHP....but it is being worked on.
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Default 08-01-2017, 08:10 PM

You can brake boost and use anti-lag to pull back timing while brake boosting to build even more boost before pushing through your brakes.


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Default 08-03-2017, 06:17 AM

With a big single, and an AT unless you stall it up, there is no good way to get of the hole. It simply will not build enough boost at the line. Doesn't matter what gear you are in. I fyou can get it to build boost. You want a tall sticky slick, get them nice and hot, and launch in 1st, NOT second. People who launch in second, are doing so because they are traction limited. If you have traction you want the low gear to get that 60 ft down which will pay multiplied dividends on the back end.


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