zippy

sounds like they made your converter too tight. how high is it brake stalling?

vanillagorilla

iTrader: (1)

That's what I'm saying....just get a looser converter.

I could build 2psi with mine with a converter that footbraked to 2500. So it could be in the wastegate setup or turbo location.

I say get a nice electronic boost controller first though. That will help you control your boost in more situations than just launching.

8ALTNG

iTrader: (1)

I had the same problem. I got some Hawk front pads. Now if i pump the brakes and then hold them I can break boost to almost 10#'s. I have a 3200 stall PI convertor too.

trtturbo

iTrader: (25)

One reason is that the first generation 2 step was only about $130. and way easy to put on. Harlen is coming with the next generation 2 step hopefully in about a month or two. It is night and day difference between trying to brake stall into boost and using a 2 step. You do however have to get rid of the cats to use it.
I have one customer that launches off the 2 step at 5600rpm and lifts the wheels. This with a stock block LS1.

vanillagorilla

iTrader: (1)

Can some one explain how this 2 step thing works though? You all keep talking about it like it's the best thing since intercooling, but nobody says how it works. Is it just a name for a simplified electronic boost contoller. The talk of cats has me confused now. Does it go inline of the exhaust or something?

quicksilverado

iTrader: (8)

A 2-step plugs into the wiring harness between the pcm and the coil packs. You set it to a specific rpm. Once the rpm is set you then stand on the brakes and hit a button to engage the 2-step. You then put the gas to the floor. When the rpms hit the preset, it will rev to that point and stay there and the motor fires on every other cylinder and then alternates to every other cylinder. When you release the brakes the engine begins to fire on all cylinders. At this point if you are on slicks hang on because its like being shot out of a cannon. Hope that helps. I am currently launching at 2800 rpm.

quicksilverado

iTrader: (8)

I can build well over 6 psi without the 2-step. So that theory goes out the window.

04Denali

would that cause a misfire code to come on?
Mark

quicksilverado

iTrader: (8)

It will if it is not turned off.

zippy

if you're using the right converter all the 2 step is going to do for you is make your launch more consitant. the idea behind the 2 step is to be able to go wide open at a low rpm. you'll get alot of air moving through the engine with the throttle blade wide open allowing more to get out the exhaust and therefore more spool. to me the only good way is with the correct converter or a transbrake if you are running that type of converter. the easiest way is to go off idle with a progressive nitrous system coming off the line with a 150 shot and fading to a 75 shot.