Thanks. I’m going to try to fabricate a bracket so that when the carb is wide open it activates the switch. I’m excited to try this out. Cliff
Well...the kickdown switch is working. I floored it in third at 45-50ish and it downshifted into second but...shifting into third is still not good. I feel it shift but it feels topped out. Ease off the gas and back to the floor and it goes good again. Pushing through the converter? Any ideas? Cliff
Why not do it right and get a gas pedal switch. One side of the switch gets key on 12 volts, the other side goes to the transmission. If you have constant 12 volts to the transmission, it will not upshift except at full throttle.
Larry. You are “the wizard” and I appreciate your input like always. But do I have it hooked up so that it only engages at full throttle. I am never opposed to the way Buick meant it to be but I can’t even find a 455 throttle cable right now so I thought I would just make do and fabricate a bracket. If I can’t figure out what’s happening in third I won’t make it into the 12s. And I REALLY need to make it into the 12s. Cliff
You need the shiftier in 2 gear when launching that will give a firm shift, The second gear band does not apply unless the shiftier in in second. Johnny
I have a 3 bolt throttle cable bracket for the kick down switch to mount to but I think you may have a 2 bolt. If what you have is working leave it alone. Johnny
Sounds like it's lean. I had a situation that I thought was trans and after I turned the fuel pressure up went away. It doesn't have to be laying over or not revving to cause a weak shift due to running lean. In other words, right before it is so lean than it would lay over it will cause issues. The more load, the more fuel is needed....so it may rev fine top of 2nd but 3rd is more load and needed more fuel. Make sense? A weird example was when I went from 2.56 gears to 3.90, I went slower, 13.20s slowed to 13.30s. No breaking up or anything. Turned out fuel hose was sucking closed. Fixed it and went 13.08 right away.
I am running a Mark built level 3 qudrajet and a Holley blue fuel pump. How would I check this? Hook up a fuel pressure gauge and watch it through the gears? When I first installed the fuel pump and IIRC it was around 9 psi at idle. Thanks Cliff
First off 9psi is way too high for a Qjet (6.5 max IMO). Do you run a return? Yes, fuel pressure gauge that you can see helps diagnose. Can even tape to windshield for testing. Also, look for any bad or soft hoses, kinks,etc
Will do! I won’t get to it till next weekend. I gotta work and have the crud that’s going around so I kinda feel like crap. Cliff
Actually,all BBB came with power and ground.You will have to take that one out and put the one that has power and ground .Not a big expanse and easy to do,you might have to take the oil pan [transmission] out and its pull it out put the other one in.Most trany shop should have that.Bruno.
Hey Bruno, are you saying that is why I might be losing something in third at WOT? I ran positive power to the single post on the tranny with that switch I installed and the transmission does downshift properly now. I am a little confused. Cliff
Exactly, you need to see what your fuel pressure is at WOT in 3rd gear. Not true Bruce. The early Q-jets were like that. Later ones had superior float assemblies. My 1972 Q-jet has no problem at all with 9 or even 10 psi.
Mine would flood over 8psi. Maybe I had the float higher. Doug Roe may disagree with you.... I've read that it's better to run less psi due to it increasing available volume. More or bigger is not always better...
