Advantage of 2 Step on Stocker???
 

What is the reason for so many auto stocker leaving off the 2 step?

Also, I'd think it would be quite hard on a cast crank, am I right?

Re: Advantage of 2 Step on Stocker???
 

So consisitency is the main reason, ok thanks

Re: Advantage of 2 Step on Stocker???
 

The two step allows you to concentrate on the christmas tree and not on the tachometer. In turn more consistant launches and better reaction times.

Re: Advantage of 2 Step on Stocker???
 

As for the cast crank "problem", both my Mustang 302 Stocker, and my FE428 Fairmont bracket car, have 4 speeds, and 2 steps, as well as cast cranks. The launch RPM for both cars is between 5600- 6400 RPM, on the 2 step, both cranks are still doing fine. The OE 40+ year old crank in the 428 has been in this car for 14 years now, running 10.0`s @132. I don`t know if there is a relation to the 2 step, but I did just tear the 428 down, and although the bearing surfaces still look great after 3 seasons, most of the bearings have lost their tight fit into the caps. They slipped out quite easily.

Re: Advantage of 2 Step on Stocker???
 

Any thoughts on using a two step on a long 6 cylinder crank?I wanted to go to one when I first started running stock but a voice in my head (Jeez I'm starting to sound like Billy now) said no no.Anyone with direct knowledge on this not speculation?

Re: Advantage of 2 Step on Stocker???
 

I thought the reason to use a two-step on a stocker was to give the guys who don't use one something to bitch about.

Re: Advantage of 2 Step on Stocker???
 

I have used one on my 390 stocker for a long time.....because you don't have to watch the tach. usually have the chip set at 3400 and brake line pressure at 1000 to 1100 psi, put the throttle on the floor and let the brake pedal off on the last yellow, and redlight by .005 or have a .520-30 light.

Did break a cam bolt one time, and did notice some fretting on the crank sprocket. Bought a fluid damper and have not had any problems since.

you would be surprised what you can do with brake line pressure.......;)

Re: Advantage of 2 Step on Stocker???
 

consistancey ,,,,like mentioned you you dont have to worry about rpm leave ,,also the inconsistancey of the accelerator pump circuit during hot and cold temps ,,but making the change from foot braker (brake gas)to a two step off the brake can be a huge learning curve,,there many factors holding the car at the line (my car will hold comfortably at 850 psi)but its easy to put way to much brake in to holding the car ,this will affect reaction time ,,its real easy to go red,,, but certainly the rush of the engine chattering at 3600-4000 and letting off the foot brake and have the engine to go full throttle is a sound that is music to any racer loves to hear ,,,not pro stock but its as close as i will get
gmonde

Re: Advantage of 2 Step on Stocker???
 

I'm pretty sure this won't get mentioned unless I do it, but on an automatic turbo car, a 2 step is a necessity.
As you stall up the converter, the boost comes in, so then the stall speed increases, then more boost and so on ,until the brakes no longer hold . The 2 step caps off that process at a predetermined point, in my case ,about 3800 rpm.

Re: Advantage of 2 Step on Stocker???
 

does it hurt to go low rpm like 1200-2000rpm?

Re: Advantage of 2 Step on Stocker???
 

And here I thought two steps were for drivers that weren't coordinated enough to look at a tach and the tree at the same time.....we used to call 'em rookies.

JimR

Re: Advantage of 2 Step on Stocker???
 

Very good to know....interesting and makes sense seems like one of those things youd never know unless youve been there, building a twin turbo 72, I was going with a 6 speed but if I go auto Ill know, thanks Mark.

Re: Advantage of 2 Step on Stocker???
 

x2. Noticed some main cap walk this year but I also hit the 2 step on the big end a few time by accident. Not a good thing when the engine goes from 6700 to 3000 then stalls. I now have a switch that engages the 2 step in low gear only.

Re: Advantage of 2 Step on Stocker???
 

when you get below 2000 rpm it will pop and back fire ,,there isnt enough engine revoluton for the engine to come off clean once the trigger is pulled ,,,as far as damage ,,might be a little harder on the bearings

gmonde

Re: Advantage of 2 Step on Stocker???
 

Depends on type used. Some cut the ignition only and the fuel keeps getting dumped in the dead cyl's, others cut ignition and fuel such as some used on FI, however not all FI 2 steps cut both either.

Re: Advantage of 2 Step on Stocker???
 

Don't forget tranz brakes.

Re: Advantage of 2 Step on Stocker???
 

does it hurt to go low rpm like 1200-2000rpm?

It all depends upon the car and carb. I have a 14 second bracket car equipped with an edelbrock that leaves fine at 1050-1100 rpm off the two step. It's been quite successful.

Re: Advantage of 2 Step on Stocker???
 

Michael, if you would PM me I want to ask you about your combination. I have a 14 sec street car that I am bracket racing this yr.

Thanks

Re: Advantage of 2 Step on Stocker???
 

Robert,

Pm has been sent.

Re: Advantage of 2 Step on Stocker???
 

Pat cook or anyone else who uses a brake pressure switch to release their 2 step. Where'd you get it, do you also need a gauge , is the pressure adjustable, and where/ how is it plumbed into brake system?

Re: Advantage of 2 Step on Stocker???
 

tim call tommy gaynor he can help you

Re: Advantage of 2 Step on Stocker???
 

Thanx Larry

Re: Advantage of 2 Step on Stocker???
 

Hey Micheal,can you give me a few pointers too?

Re: Advantage of 2 Step on Stocker???
 

Hopefully nobody get their panty's bunched up,

The pressure switch is plumbed into the rear brake hydraulics, the pressure switch turns on a pair of LED lights mounted at the top of the windshield, one in the center near the rear view mirror and the other on the L/H side, of course you will need a brake pressure gauge to set the switch with, the idea is to be able to see the light out of your peripheral vision, another thing that does not require your total concentration. The two step is connected to the factory brake light switch, I know a lot of people mount a switch to the brake pedal and use their foot too step on the switch the reason behind that is when you start scrubbing of that .002 on the top end you don't turn the two step on again by hitting the switch,....the .002 you were holding will turn into a tenth by turning the engine off and of course cost you the race.

I mounted a micro switch to the shifter that opens the two step circuit when the trans is shifted into high and prevents that. I have the part number for the pressure switch around here somewhere, I'll see if I can find it.

I have been using this setup since the 80's and I saw on an old F/SA Fairlane stocker that won the Winternational back in the 80's, guys name was Dan Rienhold, I just improved upon what he had.

Just a little extra what ever, the MSD two step that I use is old, newer setups may not do this, lets say you have a 3400 rpm chip in it, if you activate the switch at say 5500 - 6500 rpm, it just shuts the engine off. The only reason I mention this is, years ago when racers first started using two steps on the starting line, I heard that some were using it as a down track E.T. adjuster....to slow the car down. My experience with two steps.....that would be really hard on the engine, might work for a little while, but you probably will be doing some funny car type maintenance on engine parts.

Re: Advantage of 2 Step on Stocker???
 

Lane, you don't need any lol.

Re: Advantage of 2 Step on Stocker???
 

When I was using the 2 step last year, I had the MSD Adjustable RPM module/pill in mine. I set it at 1800 and the engine never stumbled once. What I did notice is that it blackened the plugs terribly.
Clark

Re: Advantage of 2 Step on Stocker???
 

On a stick shift car the 2 step will help keep the clutch consistent, the motor will stay clean and it saves excessive wear and tear on the valve train.

Re: Advantage of 2 Step on Stocker???
 

Mark, I'm interested to know what kind of braking system you are using. I am running a '88 Thunderbird Turbo and can only get the brakes to hold at 3000 on the two step. Thanks for the help. You can instant message me the info.

Re: Advantage of 2 Step on Stocker???
 

Marco, I'm using an original 79 manual brake firewall adapter , m/c and rod, and an automatic pedal, modified to to manual specs (all thanks to Mr Rory Mc Neil)
Factory discs, lightened, and aluminum drums on the rear.
Quite possibly, your converter is not loose enough, or the wrong configuration.