[IROCZman15]

Before making any moves I figured I would post my thoughts about sending my torque converter out for a re-stall.


I originally had the 9" Edge Racing converter stalled at 3400 when I put this engine into the car in February 2020. After about a year and a half I switched over to the current YANK performance converter and got the 9.5"* PAS (power addee series) 3800 stall, single lockup clutch. Thats when the car started sixty footing hard and I've loved it ever since. Especially the "shift extension" or rpm drop in between shifts, which is only about 700rpms with the Yank converter compared to* 1300-1600 rpms with the Edge converter.*

I think my current 3800 converter is* just a little too loose for the powerband that my engine seems to want. Despite the cam, valvetrain, intake engine parts that say my engine should make power higher above 6000 rpms, the truth of the matter is that on an engine dyno, on hundreds of dragstrip passes, and seat-of- the pants feel... my engine likes to be lower in the torque curve and pulling from 5000-6000 rpms. Maybe 6200 max. Even on the nitrous, I think I am blowing through the converter...* when its unlocked especially. I want to be shifting this car at 6,000 rpms instead of 6300 (or letting the trans shift itself instead of my hand on the shifter) and also not be on the revv-limiter with 200 feet still left before the finish line. I also hope to not keep on relying on converter lockup at the top end anymore; I would like to just keep the lockup for highway driving as it is supposed to be.*

I called Dave at Yank converters last week. I had actually also spoke to him last year about the same exact discussion points, and we both agree that I can probably accomplish these goals by getting this converter reset to a 3400 rpm stall speed. It should help me not flash the converter up so high anymore, because it was previously flashing to 4700-5100 which is past peak torque and heading downhill on the curve. It will be more responsive and still hit harder in the 60 foot compared to the previous 3400 Edge converter too. However, the shift-extension might suffer a little bit so I might have a little more rpm drop between shifts. They will also check over the converter lockup clutch and replace it if needed. I was told to stay with a single disc TC lockup clutch for my all motor and small-nitrous shot setup.*

In the coming weeks I will get under the car and start disassembling everything in order to get the transmission and converter out. I am partially thinking about sending the transmission out for another refresh, but part of me thinks that if nothing appears problematic with it; well just to leave it alone. Freight shipping down to Georgia is expensive, so I might just keep the trans here untouched.*

I can post cam specs, chassis dyno sheets, timeslips etc if anyone wants to dig into the math, but the sweet spot for this car is between 4500-5500 on motor and 5000-6000 rpms on the nitrous shot so thats why I want to take 400 rpms out of the converter. I have no intention of re-gearing the rear axle gear ratio or changing tire-height in the back either, so its pretty-much a converter re-stall as my best option.*