2step launch spark retard

[crab1092]

Last time at the track i had my two step set at 5000 and i would build about 5 lbs of boost. I have a 20g and i thought that it would get a little higher than that. Well a guy at the track to me to pull some timing when the 2step is engaged. I finally figured out how to do it with my MSD box but i dont know how much timing to pull. I tried it today and it seems that for every 2 or 3 degrees of timing i pull i can get about a pound more of boost. Does anyone know how much i can pull before i could possibly hurt my engine?

 

[BigRand]

Well as far as I know pulling timing is the lesser of two evils when it comes to spark., I believe that by pulling timing your safe gaurding the motor agains't detonation allowing for more boost at that level (don't quote, its just my guess, and how I believe to understand it, please someone else explain it differently if need be).

I wouldn't pull too much out though.

 

[silvreclips]

You should be fine with pulling some timing. I would just keep pulling a little but at a time until you no longer gain anymore boost. Advancing the timing is where it starts getting dangerous.

 

[DSM-ZERO]

how much boost are you trying to launch with? what boost level do you want to be at......IMO i woauld not leave with more than 10-12 psi due traction

The MSD will pull 1, 2, or 3, degree of timming per 1psi....

 

[crab1092]

I want to launch at around 8 to 10 because with 5psi i get no wheel spin and actually bog slightly. I dont pull any timing at all with reference to boost because i run Q16 and havent hit high enough boost to need to pull timing. But my MSD has an option to pull timing whenever the two stage wire is on. I think by pulling timing while the two step is on is practically the same thing that a lot of 4g63 people call anti-lag. From reading about their setups it seems that pulling too much timing actually can burn up your valves. I know you can pull some but i have no idea about what is safe and what isnt. I am going to the track tomorow and i am going to pull 4 degrees and and bump my 2 step to 5200 and see what happens. Maybe with a better launch and some smoother shifting i can pull an eleven out before the tracks close for the year.

 

[Blitzeclips]

If you want more power go off the line at 8psi then once you hit 2nd switch to 18psi or something. I believe that's what hahn did for their 10-11 second pass. Used a dual boost controller.

 

[Slippi84]

Becareful if you have not already done this. Too little timing will actually cause higher temps that will actually promote knock while your sitting there with boost. While I don't think it will be that bad you can go too far. This is my turbo dsmlink experience talking as I used to use a 2 stage on mine and would pull no more than like 5* because it showed that temps def rose and I would get what I though was phantom knock but was real knock. A egt gauge would be a good way to tell how far you can really go as I have never had a boosted 420a so the threshold may be diffrent.

 

[crab1092]

I am content now with my current settings. I launch at 5000 with 5 degrees of timing pulled. For some god for saken reason the last time i was at the track the timer wouldnt give us a 60 foot time so i dont know what they were. They felt and looked pretty damn good though.
Your are definetly right about raising the egts. I found a good article about this on Garrett's website. Its not only bad for your engine, but its a bi*** on turbos as well.

I still dont see how people get bigger turbos than me to build 10,15 sometimes more boost than that on the starting line. Right now i am getting around 6 or 7 psi with the pedal to the floor.

 

[Slippi84]

I am content now with my current settings. I launch at 5000 with 5 degrees of timing pulled. For some god for saken reason the last time i was at the track the timer wouldnt give us a 60 foot time so i dont know what they were. They felt and looked pretty damn good though.
Your are definetly right about raising the egts. I found a good article about this on Garrett's website. Its not only bad for your engine, but its a bi*** on turbos as well.

I still dont see how people get bigger turbos than me to build 10,15 sometimes more boost than that on the starting line. Right now i am getting around 6 or 7 psi with the pedal to the floor.

The higher the rpm the greater the load thus the more boost you can build. If you raise your rpm that your secondary rev limit is set at you will build more boost

 

[lordnikon_04]

alot of people that build more boost than you probably have some sort of anti-lag

 

[XMasta19]

alot of people that build more boost than you probably have some sort of anti-lag

+1

cutting spark from cylinders intermittently. I've seen upwards of 12-15psi built on the line with the rev limit 1 only set to maybe 3200-3500rpms

 

[Slippi84]

+1

cutting spark from cylinders intermittently. I've seen upwards of 12-15psi built on the line with the rev limit 1 only set to maybe 3200-3500rpms

Yes that is another way that works real good too.

 

[Blitzeclips]

Let's not forget too much boost is going to influence alot of wheel spin and in turn lower your times off the line.

The trick is launching with the most traction then keeping it to the ground. 12-15 psi off the line sounds good but it may not be ideal for faster 1/4 mile times..

 

[lordnikon_04]

i'm able to build my full 16pounds before i leave the line(low i know but stock turbo and fuel right now) using my two step and antilag with dsmlink. granted i'm awd so i can launch with more boost but if you combine dsmlinks two step, antilag, and nlts systems then you could probably end up leaving the line with 20-25 psi and never have it fall off, including shifting, until you let off the gas at the end. Gotta love technology .