Vpro 2 step/launch control - Page 2 - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Stony · 23rd July 2008, 03:17 AM

Any luck???

the way i understand it it you need to activate the VSS signal ( on off switch) the you need something to interrupt the vss signal to the computer. It almost sounds like we are going to need 2 switches????

I think i may just try to do some kind of speed sensor.

Raiju · 23rd July 2008, 08:41 AM

Why not use the HKS mixture switch?

Stony · 24th July 2008, 04:54 AM

Well for one i have never heard of it.... IS it designed to work with the Vpro.

any links to how it works ???

Raiju · 24th July 2008, 09:51 AM

Yeah, it's designed work with the Fcon and allows you to maunally dial in rpm incriments for the two step via a knob on the box, once it has been enabled within the Fcon unit. Once moving the speed sensor knocks the two step off. Simple yet reliable. I think the unit is around £120 from HKS dealers.

Stony · 24th July 2008, 03:32 PM

Well that’s my problem; I don’t have a speed sensor. This is an old school z drag car. And in reality the fcon is supposed to handle all that on its own…. This knob you’re talking about sounds like it give you adjustment ability.

Raiju · 24th July 2008, 04:33 PM

You can rig up a potentiometre or a g sensor. I know Paul at Engine Advantages does it like that, might be worth giving him a bell.

Stony · 28th July 2008, 02:04 PM

Thanks never thought about that.

We found a 3 way switch online that i Sould be able to wire my transbrake AND 2 step thru. If you can that will be perfect.

Will let you guys know how it goes.

R.I.P.S NZ · 29th July 2008, 09:48 AM

Hi stony,
We tried lots of ways to build boost quickly on the transbrake, ignition retard, rev limiters etc and it basicly doesn't work with an auto, well not in our car anyway.

Once we got a decent converter and a small shot of nos on the transbrake, we could build boost in a reasonably quick amount of time and as long as the starter wasn't too trigger happy we could get plenty of power in time for launch.

On a Pro tree it was touch and go if the starter was quick but on a sportsman tree it was fine.

Best of luck with the way you decide to do it.

Rob

Stony · 29th July 2008, 06:12 PM

Yea I figure I will have to do something like that eventually but I will be happy with even a little boost as long as it maintains it and doesn’t bog.

Stony · 1st August 2008, 01:53 PM

Well we found a switch that will run the transbrake and also activate the 2 step launch control all in one switch ( we think) Its supposed to be here today, if it does get here it will be installed sat and we will test it. I will post results here if it works

Stony · 3rd August 2008, 05:44 AM

Spent all day trying to figure out how to turn teh 2 step off. for some reason it's not reading the VSS signal ;<

Oh well here is some fun from today

Will have more video next weekend from the track!!!!

Stony · 11th August 2008, 01:56 PM

Well we fixed the voltage drop problem. but that didnt fix the miss. it looks like im leaning out. going to have to upgrade the pump and oh yea get the converter restalled, ITS WAY OFF!!!!!

And the best run of the day a 12.2 at 140MPH!!!!

no supra jokes please :lol_hitting:

Andy Barnes · 11th August 2008, 03:58 PM

Hi,

Your problem is simple to solve as long as you know what you are doing

You need to install a microswitch on the clutch pedal arm. When you have the clutch depressed the two step is active, when you lift the clutch the microswitch is switched and the 2 step limiter is removed. This can be done within the F Con software and the F Cons aux outputs. This means you do not need a speed sensor and alo enables you to dial in when the 2 step is released on launch as you can vary the point the microswitch operates in relation to the pedal travel points. It also means you dont need to switch the 2 step on or off when you want to use it, its automatically engaged every time you have the clutch depressed. In addition to this you need the HKS mixture switch which enables you to vary the RPM at which the 2 step operates so you can alter it depending on the track conditions and launch rpm required to achieve the optimum traction, again the parameters of which are controlled within F Con.

You cant do this yourself if you dont have the Fcon software or someone that knows how to use it properly.

Cheers

Andy

Abbey M/S · 11th August 2008, 04:49 PM

Andy I thought his car was an Auto, still easy to sort out , when turn the 2 step off on John,s car using a micro switch on the handbrake set up.

Again we use a HKS mixture switch to adjust the launch RPM and with a little work you can also alter the 2 step launch ignition retard with a HKS mixture controller.

Markie

Andy Barnes · 11th August 2008, 04:51 PM

Auto?

Didnt read it all tbh

ho hum.. handbrake switch it is

Would have though Tweeny Rob would have jumped in to help the bloke, he is apparently doing things with Fcon that even HKS havent thought of

29th July 2008, 09:48 AM	#23 (permalink)
R.I.P.S NZ GTR Register Member Join Date: May 2004 Location: Rotorua NZ Posts: 2,198	Hi stony, We tried lots of ways to build boost quickly on the transbrake, ignition retard, rev limiters etc and it basicly doesn't work with an auto, well not in our car anyway. Once we got a decent converter and a small shot of nos on the transbrake, we could build boost in a reasonably quick amount of time and as long as the starter wasn't too trigger happy we could get plenty of power in time for launch. On a Pro tree it was touch and go if the starter was quick but on a sportsman tree it was fine. Best of luck with the way you decide to do it. Rob __________________ R34 GTR: Quickest street trim skyline in NZ, 9.7 @ 137 on 1st test pass, first meeting in the UK, 10.4 @ 144. 240z, WRH8.71 / 162 @ 2 bar, stock crank, full street trim 1972 240z, RIPS RB30, quickest/fastest Jap street car in NZ 8.71/162mph 2 bar, No NOS, street tyres. RB engine building, alloy and stainless fabrication, affordable skyline tuning and high capacity repowers, worldwide shipping arranged. e-mail rips@inspire.net.nz www.ripsltd.com

11th August 2008, 03:58 PM	#28 (permalink)
Andy Barnes New Users Join Date: Jan 2002 Location: Sheerness Posts: 3,147	2 Step Hi, Your problem is simple to solve as long as you know what you are doing You need to install a microswitch on the clutch pedal arm. When you have the clutch depressed the two step is active, when you lift the clutch the microswitch is switched and the 2 step limiter is removed. This can be done within the F Con software and the F Cons aux outputs. This means you do not need a speed sensor and alo enables you to dial in when the 2 step is released on launch as you can vary the point the microswitch operates in relation to the pedal travel points. It also means you dont need to switch the 2 step on or off when you want to use it, its automatically engaged every time you have the clutch depressed. In addition to this you need the HKS mixture switch which enables you to vary the RPM at which the 2 step operates so you can alter it depending on the track conditions and launch rpm required to achieve the optimum traction, again the parameters of which are controlled within F Con. You cant do this yourself if you dont have the Fcon software or someone that knows how to use it properly. Cheers Andy

11th August 2008, 04:49 PM	#29 (permalink)
Abbey M/S GTR Register Member Join Date: Feb 2002 Location: The workshop... Posts: 1,922	Andy I thought his car was an Auto, still easy to sort out , when turn the 2 step off on John,s car using a micro switch on the handbrake set up. Again we use a HKS mixture switch to adjust the launch RPM and with a little work you can also alter the 2 step launch ignition retard with a HKS mixture controller. Markie Last edited by Abbey M/S; 11th August 2008 at 04:59 PM.

11th August 2008, 04:51 PM	#30 (permalink)
Andy Barnes New Users Join Date: Jan 2002 Location: Sheerness Posts: 3,147	Auto Auto? Didnt read it all tbh ho hum.. handbrake switch it is Would have though Tweeny Rob would have jumped in to help the bloke, he is apparently doing things with Fcon that even HKS havent thought of

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23rd July 2008, 03:17 AM	#16 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Any luck??? the way i understand it it you need to activate the VSS signal ( on off switch) the you need something to interrupt the vss signal to the computer. It almost sounds like we are going to need 2 switches???? I think i may just try to do some kind of speed sensor.

23rd July 2008, 08:41 AM	#17 (permalink)
Raiju GTR Register Member Join Date: May 2008 Posts: 102	Why not use the HKS mixture switch?

24th July 2008, 04:54 AM	#18 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Well for one i have never heard of it.... IS it designed to work with the Vpro. any links to how it works ???

24th July 2008, 09:51 AM	#19 (permalink)
Raiju GTR Register Member Join Date: May 2008 Posts: 102	Yeah, it's designed work with the Fcon and allows you to maunally dial in rpm incriments for the two step via a knob on the box, once it has been enabled within the Fcon unit. Once moving the speed sensor knocks the two step off. Simple yet reliable. I think the unit is around £120 from HKS dealers.

24th July 2008, 03:32 PM	#20 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Well that’s my problem; I don’t have a speed sensor. This is an old school z drag car. And in reality the fcon is supposed to handle all that on its own…. This knob you’re talking about sounds like it give you adjustment ability.

24th July 2008, 04:33 PM	#21 (permalink)
Raiju GTR Register Member Join Date: May 2008 Posts: 102	You can rig up a potentiometre or a g sensor. I know Paul at Engine Advantages does it like that, might be worth giving him a bell.

28th July 2008, 02:04 PM	#22 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Thanks never thought about that. We found a 3 way switch online that i Sould be able to wire my transbrake AND 2 step thru. If you can that will be perfect. Will let you guys know how it goes.

29th July 2008, 06:12 PM	#24 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Yea I figure I will have to do something like that eventually but I will be happy with even a little boost as long as it maintains it and doesn’t bog.

1st August 2008, 01:53 PM	#25 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Well we found a switch that will run the transbrake and also activate the 2 step launch control all in one switch ( we think) Its supposed to be here today, if it does get here it will be installed sat and we will test it. I will post results here if it works

3rd August 2008, 05:44 AM	#26 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Spent all day trying to figure out how to turn teh 2 step off. for some reason it's not reading the VSS signal ;< Oh well here is some fun from today Will have more video next weekend from the track!!!!

11th August 2008, 01:56 PM	#27 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	Well we fixed the voltage drop problem. but that didnt fix the miss. it looks like im leaning out. going to have to upgrade the pump and oh yea get the converter restalled, ITS WAY OFF!!!!! And the best run of the day a 12.2 at 140MPH!!!! no supra jokes please :lol_hitting: