[chuckies76ta]

In the Hughes video he talks about Spragless creating a tremendous amount of heat on the street. Says will cook the tranny if driven too long. The 10 strut mechanical diode is where the strength is.

[Half-Inch Stud]

I suspect synthetic fluid is lower density than conventional mineral oil.
Wonder when higher density transmission fluid becomes a path to tuning and efficiency.

[grandville455]

Originally Posted by Half-Inch Stud

I suspect synthetic fluid is lower density than conventional mineral oil.
Wonder when higher density transmission fluid becomes a path to tuning and efficiency.

I put JD Hyguard In mine to tighten it up slightly

[Scott Stoneburg]

I watched an in-car video of one of my passes, not the best video but it did catch the flash RPM and the shift recovery RPM. It currently ( with my previous 474 ) drops from 6600 to near 5200 on shift recovery. Is that a lot? Blaktopr ' only dropping a few hundred RPMs.

[slowbird]

Originally Posted by Scott Stoneburg

I watched an in-car video of one of my passes, not the best video but it did catch the flash RPM and the shift recovery RPM. It currently ( with my previous 474 ) drops from 6600 to near 5200 on shift recovery. Is that a lot? Blaktopr ' only dropping a few hundred RPMs.

700-900 fall back is normal.
Vid of my playback tach. Engine made peak hp at 8000 and peak tq at 6700
https://youtube.com/shorts/zau289X213U?feature=share

[Dragncar]

900 normal ? Call it 1000 RPM.
No, its too much a drop.

[blaktopr]

PTC told me that you will drop to the stall of the converter. There are variables that can change that, gear ratio (trans), shift point but it usually falls back to the stall. Now if you had a 5k stall and shifted at 10k, then odds are you will not fall back to stall. In my case i shift at 6500 and fall back to stall. If i wanted to, i can shift at 7k and still fall back to 6300, which would pretty much be a 700 drop, shifting 500 past peak hp. There seems to be no "blanket" number here. This is why guys tweak to get the best they can for heads up. Best possible fin angle/stator aggressiveness etc for best use of power. But IMO, taking what a company like ptc gives you is gonna run 90 to 95% right off the bat and can use a slight tweak after you compile data at end of year. There will be no "unicorn" converter combo that the internet will beat over a PTC or other known companies. In a case like mine, i need to run the number over and over wether its 10.0, 9.50, 6.0 or just any dial i choose for that weekend. Im probably too loose with a little excessive slip up top (also due to reduced mph from spragless messing up the calcs), and will pull it for a winter freshen. But i wont expect more than .1 if any when i get back to the track. I also dont need it.

[S/st 54]

Scott, looking at your dyno sheet my 2 cents is, 5800-6000 stall would be good. You want the engine rpm upstairs where your engine is making the most power. Also, run a converter with a sprag in it. They are faster.



I run a spragless Hughes converter with my throttle stop combo. Yes, it’s slower but imo it’s more consistent with the throttle stop,and has on avg about 14%-16% slippage on the top end according to my racepack. Mine flashes to 6300 and my engine made peak at 7100 and crosses at 7500ish. On the return road after a pass trans temp is at 150 and once the car is turned off the trans temp climbs to 175 but cools off rather fast when I put a fan on the trans pan/converter.

[Stan Weiss]

Originally Posted by slowbird

700-900 fall back is normal.
Vid of my playback tach. Engine made peak hp at 8000 and peak tq at 6700
https://youtube.com/shorts/zau289X213U?feature=share

Originally Posted by Dragncar

900 normal ? Call it 1000 RPM.
No, its too much a drop.

I hope you did the rest of the math for your engine build better than that. Most everyone else would call that 800 RPM.

So how many times have you shifted your engine @ 8000 + RPM?

Stan

[blueghoast]

Originally Posted by Stan Weiss

I hope you did the rest of the math for your engine build better than that. Most everyone else would call that 800 RPM.

So how many times have you shifted your engine @ 8000 + RPM?

Stan

I think your rite in the ball park. Every one I've talked to say's 700-1000
My 2 cents

GT.