Any way to adjust shift points?

[usetaboost]

Trans shifts over 5500 rpm. I'm sure this is too high for a car with mild ported heads and a 204/214 cam. Only mods is a 30 dollar shift kit and a 3200 10" lu stall

 

[David Husek]

Make the small weight on the governor heavier to lower shift points. There may be other things going on why it is shifting higher than stock, assuming you have a BR-F trans.

 

[usetaboost]

Would it help if I put the stock upshift spring back in the valve body?

 

[David Husek]

The T.V. modulator upshift valve spring #315 should be removed from the valve body. No spring should be installed at this location. What valve body and governor combo are you using?

 

[bison]

Make the small weight on the governor heavier to lower shift points. There may be other things going on why it is shifting higher than stock, assuming you have a BR-F trans.

His driveshaft speed vs engine speed is probably too low because of the converters coupling efficiency.



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[RIFF RAFF]

MY CAR SHIFT'S AT 5200 WITH A STOCK CAM & MILD PORT STOCK HEADS . 3000 STALL 9.5 PTC .. LIKE CLOCK WORK . THANKS
BE TO LONNIE .. TOOK A LOT OF PLAYING WITH THE WEIGHT . IT'S LAST BREATH WAS ABOUT 5350 .

 

[David Husek]

Make the small weight on the governor heavier to lower shift points. There may be other things going on why it is shifting higher than stock, assuming you have a BR-F trans.

His driveshaft speed vs engine speed is probably too low because of the converters coupling efficiency.

Yes Brian, I would agree, this would be one of the other things that could be a cause of the higher shift points. Many of the available 3200 stall 10" lockups using off the shelf parts will push thru the shift points some due to the driveshaft speed vs. engine speed being too low from poor converter efficiency (20% typically) at the engine speed we use them. That converter will start to couple much higher than most Buick v6 engines max rpm. (5600-5800)

 

[usetaboost]

It's one of dustys.

The T.V. modulator upshift valve spring #315 should be removed from the valve body. No spring should be installed at this location. What valve body and governor combo are you using?

It's a stock brf with a transgo kit. I can't remember exactly what was all changed but I can check and post later.


The converter is one of dustys. Running 24psi. m15 nozzle. 95% duty cycle at wot

 

[chris718]

Installing an HG secondary weight governor spring and 8-32x.375" brass set screw to retain the secondary governor spring should lower the shift rpm @ wot approximately 400 rpm.Test the WOT ice cold and warmed up and note rpm difference.It should be no more than 200 rpm less arm.If so are all upshifts late or just the 1-2? If just the 1-2 check tv upshift or shift delay oil land on the 1-2 tv valve for ware or sleeve for leakage.

 

[usetaboost]

Hmm. Doesn't seem to be good at this point. Got like a metallic "whirring" sound that only stops when I shift into gear and then lightly begins to make noise again. Shifts don't seem as crisp as they were but they do seem slightly better when the trans is cold. I didn't get a chance to go wot in the car since I had my daughter with me. I'm thinking either something broke or it's about to. The trans isn't acting erratic or anything. Any more things to investigate or possibilities? The gears aren't slipping or lazy. Just don't hit anymore. Feels like a regular 200 at this point.

 

[David Husek]

Hmm. Doesn't seem to be good at this point. Got like a metallic "whirring" sound that only stops when I shift into gear and then lightly begins to make noise again. Shifts don't seem as crisp as they were but they do seem slightly better when the trans is cold. I didn't get a chance to go wot in the car since I had my daughter with me. I'm thinking either something broke or it's about to. The trans isn't acting erratic or anything. Any more things to investigate or possibilities? The gears aren't slipping or lazy. Just don't hit anymore. Feels like a regular 200 at this point.

Give me a call tomorrow, I will go over things in detail to help you figure this out....

 

[usetaboost]

Most likely won't have time tomorrow. I should wednesday but it won't be til around 5pm if that's ok. Oh I forgot to mention, shortly after I posted this thread the trans cavitated on the 2-3 shift, freespun for a split second and slammed into 3rd going wot. Weird thing is there wasn't any noises or anthing until the next night.

 

[David Husek]

Most likely won't have time tomorrow. I should wednesday but it won't be til around 5pm if that's ok. Oh I forgot to mention, shortly after I posted this thread the trans cavitated on the 2-3 shift, freespun for a split second and slammed into 3rd going wot. Weird thing is there wasn't any noises or anthing until the next night.

Wednesday anytime after 11am is fine. Speak to you then....

 

[usetaboost]

noise goes away when I loosen the tv cable

 

[BEATAV8]

If just the 1-2 check tv upshift or shift delay oil land on the 1-2 tv valve for ware or sleeve for leakage.

Mine is too high just on the 1-2. Will talk with Jimmy about this leakage possibility.

My pile is shifting 5950 on the 2-3 but the 1-2 is way too late, over 6400? Not sure how high cus it hit the rev limiter @ 6300 on the 1-2.....
BR governor with a KC valve body. PTC 9.5" non lock. 132mph++ power level. Trans is super fresh, first WOT pull.

Any other possibilities for a late 1-2?

 

[David Husek]

Mine is too high just on the 1-2. Will talk with Jimmy about this leakage possibility.

My pile is shifting 5950 on the 2-3 but the 1-2 is way too late, over 6400? Not sure how high cus it hit the rev limiter @ 6300 on the 1-2.....
BR governor with a KC valve body. PTC 9.5" non lock. 132mph++ power level. Trans is super fresh, first WOT pull.

Any other possibilities for a late 1-2?

A BR governor with a KC valve body will shift around 6500-6600+. Add 2 grams to the governor small weight and work from there. I recommend manually shifting the 2-3...

 

[BEATAV8]

A BR governor with a KC valve body will shift around 6500-6600+. Add 2 grams to the governor small weight and work from there. I recommend manually shifting the 2-3...

Thanks Dave
I should've mentioned this trans used to shift the 1-2 at 6150 but it has gotten out of hand for some reason. It was shifting 1-2 OK like that last fall, but then it burned the band up. At that time is wasn't really all to agressive, it still had the accumulator working and I think Jimmy mentioned the line bias valve was also still working. That stuff was changed to make it more agressive when it was freshened. Wouldn't expect that to change the shift point though?

Adding 2 grams to the governor small weight will affect both the 1-2 and the 2-3 too?

 

[usetaboost]

Dropped the pan today after I got off the phone with David. Lots of crumbs on the magnet and a little in the bottom of the pan. Clutch material from having a bad pump? Or something else?

 

[usetaboost]

To me it doesn't look like anything that much outside of normal, but there's gotta be something going on in there (or not going on lol)

 

[BEATAV8]

Well I chatted with Jimmy and tried the first most obvious thing, loosening the TV cable a notch. I had it *really* *really* tight. 1 click did nothing but 2 clicks helped. It's shifting 1-2 at 6250 and 2-3 at 5750 now, and it's pulling down hard and crisp.

Kind of a big spread, I wish it were closer together.