Launch Control

[PM-R33]

Just so people can see, here is the launch control on the Vipec. As you can see there are a lot of things to play around with and a lot of options.

*Please note: Those are not my settings, they are just the default values from the base map. I have played around with it a little bit, but not much. Having balled tyres makes trying to set up launch control a bit pointless

[W0rp3D]

More critically though what are your 60ft times?

[Brandon]

Ye i knew what you meant, just too hard to reply in depth from my phone

But with a PFC - You won't be able to get the "staged" launch control where boost is varied against Speed/RPM. So sorta complicating it a little but it is possible. I guess its the one thing Phil didn't mention in the "Launch Control" summary

I believe the ViPec/Link and no doubt other ECU's have the Auxilary inputs that you can map/configure with a boost controller and then be variable against Speed / RPM / Boost

Or perhaps launch control like a man - with the right foot

??

I always thought without an ecu thats capable of "launch control", you can never manually launch with boost. Am I wrong?

[DVS JEZ]

What tyres worped?

Are u wheel spinning?

Any footage of ur runs?

U can build boost by holding handbrake and slipping the clutch with revs. Dont do it for too long obviously.

[R31Nismoid]

:O

Something is going going on man, 2.3 60ft (I'm assuming you are left).

I am not convinced of you having 250rwkw on that particular day. Your time slip should look more like the one on the right!

I was going to say maybe you backed off, but your half track time tells me you did not.

I'm stumped...

[W0rp3D]

federal 595ss 235/40/18

[DVS JEZ]

Dyno sheet?

[R31Nismoid]

??

I always thought without an ecu thats capable of "launch control", you can never manually launch with boost. Am I wrong?

What i mean by "staged" is as you leave the line, you can control things. I count it as launch control, probably a little incorrectly, but it "aids" in the launch.

1st Gear - 14psi max

2nd Gear - 16psi max

Or maybe...

4500rpm - Max 16psi

6500rpm - Max 20psi

Just depending on what you use as an Aux input as. So you can then reference and configure based upon that.

[W0rp3D]

:O

Something is going going on man, 2.3 60ft (I'm assuming you are left).

I am not convinced of you having 250rwkw on that particular day. Your time slip should look more like the one on the right!

I was going to say maybe you backed off, but your half track time tells me you did not.

I'm stumped...

!!

[R31Nismoid]

federal 595ss 235/40/18

For that size tyre etc, your 60ft actually isn't too bad at all. You dont have much sidewall to play with, and the tyres are skinny.

Are you perhaps restricting to 7000rpm and falling off boost with a gear change or something?

Or taking a while inbetween gear changes?

[W0rp3D]

thats the only one with close to that 60ft, i think one other was 2.5 rest were 2.6 2.7.

The limiter is at 7k, i think i hit it in 1st but not the rest, the dyno graph shows no boost drop....... dunno!

[R31Nismoid]

Ah i think we found the problem - up the limiter to 7500, make use of that big turbo

Sounds like you are just shifting and falling off the power a bit.

[W0rp3D]

there is a problem in the system some where now, no idea of how big or how small it is, was not pulling as hard on sunday as it did on friday and there seems to be another slightly different noise when boosting, still has the same whistle but now it also has something like a whistle but a bit more dull as well, will pull all the induction off this weekend and check things out.

[W0rp3D]

Ah i think we found the problem - up the limiter to 7500, make use of that big turbo

On a stock motor?

[PM-R33]

I wouldn't.

[R31Nismoid]

Hrm... Yes perhaps not. But for 1-2 passes, I'm brutal like that

Although i used to take mine to 7500rpm before it died a dismal death. Was tune related on what i knew was a near dead motor anyway, not RPM!

[PM-R33]

So you say

[W0rp3D]

I also didnt bother changing tyre pressure as its a street car and i wanted to see how it went in the same trim that is in every day of the week, as i have read a few times since then, there seems to be more traction on the street than at calder, just want to get the f**ker out of the hole better more often!

[W0rp3D]

I also had not really practiced launching it much on the street, in fact the first real go i gave it was on the way to calder leaving a set of lights at the start of the freeway, that resulted in a loud pop in 3rd gear and a ball of flames that i could see over the top of my gtr spoiler in the rear vision mirror, 1.5 hours later and new clamp bought and installed we were on our way again!

[R31Nismoid]

2.3 isn't overtly bad mate if you can keep replicating it, given the tyre size and you don't have much sidewall to play with even if you did let them down.

I think if you can get consistent 2.3, and find out if you do have car gremlins - get them fixed there is no reason you can get a low 13 / high 12.

I was getting 1.9 - 2.1 with 225/60R16, so i could let them down to 22psi (best for traction i found) and get it down from 2.3

You don't really have that luxury with 18s