2 Step Question?

[Chad Rhodes]

art, are you seeing that rpm variation on the tach or are you logging it and its doing that? i use the two step in my DFI and the tach will do some crazy stuff, but if you read the data logs its a pretty flat line, maybbe a 50-75 rpm variance.

[art leong]

Originally Posted by Chad Rhodes

art, are you seeing that rpm variation on the tach or are you logging it and its doing that? i use the two step in my DFI and the tach will do some crazy stuff, but if you read the data logs its a pretty flat line, maybbe a 50-75 rpm variance.

This is from the datalogger, I think the tach needle would have an effect if I was using the tach to figure it.
I'm wondering if it's a 4 cylinder thing. With an 8 cylinder if you cut one cylinder at a time your cutting 12.5% of the power. When I hit the button I'm taking out 25%.
When in neutral the motor stays within 75 rpms when the button is activated. But with a load on it. It gets cranky.
My brakes are stock discs (bonded pads) in front and back. I can't use larger or aftermarket brakes because I need to run 13 or 14 inch wheels (to keep wheel height to 20 inches)
The converter was made for a transbrake application. I'm wondering if I went to a softer hit converter. If it would be easier to hold on the line.

[Mile High]

I wouldn't worry about it until I took it to the track and tried it. The starting line is alot different than your driveway. I change converters on mine once tried it at home and it started pushing, took it to the track and all was well. I prefer a pressure switch to operate the 2 step.

Jeff

[gmonde]

X2 on taking it to the track first before any changes are made gmonde

[art leong]

My brakes are single piston 54mm front and 34mm rear. I have a pressure gauge and am able to get to around 1400 pounds of pressure.
Should that be enough?

[Mile High]

Maybe the brakes aren't strong enough. I don't have a brake pressure gauge. The starting line is alot different than your driveway. With my converter change I lowered my launch rpm from 3400 to 2700 and dropped front tire pressure 10 lbs. to cut a light. I have Wilwood discs up front and stock Ford drums on the rear. Don't need no stinkin' transbrake.

Jeff

[69Cobra]

I have a break pressure gauge and usually bump the car in with about 150# of line pressure once I'm pre-staged. The only time I've ever had a problem is when the two step failed and it went up against the high side at 7400. At that point the counterweights were coming in and therefor I didn't have enough air gap so it started to pull the car through the lights. Sorry I couldn't resist. All this automatic stuff just confuses me.

[Robert Simpson]

With my converter change I lowered my launch rpm from 3400 to 2700 and dropped front tire pressure 10 lbs. to cut a light.

Man you must have been going RED big time, to make those changes. My car is very sensative to RT vs. launch RPM.