You will not build boost in park or neutral...your motor is cycling so fast because it has no load and will just eat up all the air you're throwing at it from the turbo. Trust me I've free-revved my car to 7k and it's still in vacuum. No load = no boost.

And why would you try to build boost in park or neutral? You either want to build boost on the t-brake or on the foot brake. No neutral slams. lol

 

So these harlan two steps are made for no reason? It should act the same as it would on a manual car.

 

You have an auto...building boost in park/neutral means NOTHING. Do you have a t-brake or are you foot-braking it?

On stick cars, guys usually can't build much boost on just a 2-step either. Unless the turbo is on the small side. They usually have to retard the hell out of the timing.

 

Have you read this thread? I am 2 stepping the car at 5 k with it in park/neutral, with a 408, a 88, and a auto, 15 degrees of timing. I know for a fact several 6 sped cars with stock displacement motors have made 6-10 lbs with 76mm turbos, tuned the exact same way as mine. I am going to try and take some timing out via the Iat.

 

Let me know how that park/neutral tuning works out for you...I can only explain something so many times before I realize I am wasting my time...

GOOD LUCK!

 

Why are you so concerned with building boost in park or neutral? Put it on the tbrake, floor it and go. Auto cars and manual cars are very different.

Even if you do build boost in park or neutral what are you going to do with it? Have you even tried the t-brake? If not, go somewhere and try it, just put it on the brake and roll into the gas then see how much boost you build. If you are looking to break a trans by slamming it into gear then you wont need any boost to so that!

 

I read it, and I saw where people were trying to help you. Did you read it?

 

I have the same problem with my two step. I build maybe 1lb of boost. I heard that there is going to be a timing trick that Harlan is going to put into the next version??? anyone confirm deny? Harlan?

The 2-step gets me fully out of vacume and into boost (barely) so its a major improvement over without. Would like the whole deal though... good info on this board

 

What makes a 6 speed car different then a auto car with no load on it(either by neutral, park, or under the stall point)? It concerned me that the car wasnt building boost when similar set-ups were.

 

No difference... we're referring to staging at the line, you can footbrake an auto or run a trans brake to bring it up on the converter and put the engine under load higher in the rpm range so when you release the brake the car fires out of the hole. The 6 speed car is always stuck in "neutral" when the car is stopped, when in gear or out, because we don't have a converter to slip when the car is in gear, therefore we can't "load" the engine, and spool the turbos unless the clutch is engaged and we're putting the foot to the floor.

 

Yes, there will be a built in retard function in the new 2 step.

Turbo size can play a big role in how much it makes with no load. RPM as well. Kyle's car GT42-76 with a T6 hot side and a 370 inch motor make about 2 psi at 3500 RPM on the 2 step in park/neutral. 3500 against the converter on the brake it makes 11psi, 4500 it's 18.

I'm assuming you're WOT on the 2 step? Just making sure

results make vary for how much it makes, but one this is for sure, turbine shaft speed is WAY up versus part throttle staging.

 

I do understand that the car will make boost fine with it loaded, I never questioned that. It was a question, as well as wanting to get some more understanding based on my past results. I can make plenty of boost with a footbrake and 2 step, or on the transbrake and 2 step. Just wanted to know why it wasnt make good boost unloaded on the 2 step. Thanks for all the info..

 

Harlan.... great to hear!! I am not going to run a GT-42 by any means more like a PT76GTS so with what you have said I would expect more like 5-8lbs of boost. When is it going to be up for sale?