High speed leanout

Has anyone run a high speed leanout on their car to use it as either at the staging lanes switch for a touch more power or as a "scramble button" like what some turbo people use?

 

Not unless you got nitro hooked to it-----

 

Good one mike. That made me laugh.

If you run a grid you can put a few switches on the dash and wire them to the step retard functions. As long as the step retard has 12v, it will pull the preset amount of timing in the respective step retard. Example: you can have 3 switches on the dash, they apply 12v + to step 1,2,3 respectively. Wanna pull 2 degrees, flip one switch up, 4 degrees flip another up and 6 degrees flip the last one up.

If you run a command module, the later stuff has the ability to shift the timing graph up or down easily. It also has an sd card provision where you can load a few tunes and change them pretty quickly in the lanes. Just don’t get confused as to which file is the hot tune.

 

I definitely thought about doing that with my grid but am using the first two steps for the shifting. It lets the grid know its in the next gear and I can pull timing to try and reduce wheel spin. Doing the rpm drop way doesn't work much. Since the class I run in is just a for fun heads up (not a national event) I was hoping for some way to adjust either on the fly or in the lanes. My tuneup is super fat to stay on the safe side in hopes I don't have to do as much tear down at the track.

 

I could do another step retard and just use it for high gear but I feel it won't be as effective since it would only be active after the first two steps have been activated and I'm in high gear

 

I am using them for the shift indicator to grid so I can get the quickest response in retarding the timing when shifting. I looked at the 7730 instructions again and it says you "note: these wires can be used as gear select indicators". Am I the only one who has used it this way? The msd person I spoke to on the phone the other week thought I was crazy and I was thinking the same until I saw this in the instructions. I have only tested it with the handheld tester but it seems to be much better than rpm drop based shift indicator

 

From looking at the data it looks like the tire is already spinning before the grid knows it shifted and is late with taking out power. I'm open minded as well and new to this, so feel free to be harsh lol. Here is a pic of the data. Red is rpm, green is ds, and yellow is timing.

 

You can use any of the steps any time. Step 5 can also be used as a anti lag boost building deal for turbo cars on the two step.

What I have done in the past is use the msd 7760 3 stage timer to send a 12v+ to the step retard(s) of your choice via rpm and time. You can then tailor it to how much before the shift you want it to pull timing to minimize the spin up. In the step retard you can ramp in, delay off and ramp out if you like.

 

Auto shifted lenco (cs1). I currently have it setup to where the 12v going to step retards comes from a relay triggered by the activated negative coil side on solenoid. Hope that makes sense

 

Msd 75591 is what is sending signal to solenoids to shift lenco. There most definitely is a delay going through relay but I feel better than going by rpm drop. I thought about doing time base retard but dont race enough to have the car that consistent. My entire crew is family and with that it's whoever can make it that particular weekend which would be a max of 3 times a year

 

We ran one way back like 1991 way back. Called it a kill button. Had a 065 to 075 jet and would normally dimple a piston and beat cpl bearings,Hey if it wins who cares. At the time there where no electronics allowed so we did it with air.

Also had a lean out open in second and shut off in third that actually richened third because temps would climb faster and we needed to cool chamber with more fuel. Something we found by having a pump go gallon lean but ran like hell to half track.

I loved watching folks trying to figure WTH I was doing. Especially other crew chiefs.

 

did you win with this system -and theory

 

I would say it worked well. We won cpl national events ,cpl runner ups, few number 1 qualifiers, top 4 car most weekends and 1 round short of world championship. So all in all yes.

Car was Starr Rider and driver was Rickie Bowie if anyone wants to fact check me .

 

Pretty much same deal. Amazing what you learn from screwups. While the speeds are worlds apart,so was the time period. Now 196 in 1/8 means something wrong. In 1991 it meant something was right even if it went wrong afterward, It did. LOL now.