11% Slip with locked single disc

[Dusty Bradford]

If your current converter is too loose then it's taking longer to couple after launch. The converter usually couples the most at the point it drops to on the gear change. If your shifting at 5800 and dropping to 5200, most likely your not coupling until that rpm as well. The right converter would couple another 400-600 sooner which could net better 60 times.

 

[V6RACER]

If your current converter is too loose then it's taking longer to couple after launch. The converter usually couples the most at the point it drops to on the gear change. If your shifting at 5800 and dropping to 5200, most likely your not coupling until that rpm as well. The right converter would couple another 400-600 sooner which could net better 60 times.

Listen.. It works.

 

[MikeL.]

same issue here

If your current converter is too loose then it's taking longer to couple after launch. The converter usually couples the most at the point it drops to on the gear change. If your shifting at 5800 and dropping to 5200, most likely your not coupling until that rpm as well. The right converter would couple another 400-600 sooner which could net better 60 times.

MJRWOOD, not to hijack but I've been watching this thread because I have a single disk vig, same exact stall and was thinking of updgrading to the multi disk also once winter hits. Tracks around here close this weekend:frown:

Dusty I understand what you're saying about coupling but if you've seen only a 50-100 rpm increase over a locked VIG, does that mean someone was "driving through" the locked converter....how's that possible

 

[NCTURBOS]

Dusty I understand what you're saying about coupling but if you've seen only a 50-100 rpm increase over a locked VIG, does that mean someone was "driving through" the locked converter....how's that possible

I think what he is saying is that the PTC unit is a very efficient non-lock converter, that works very well both for spool-up and top-end mph. Something I'd like to try myself... If I still had a TSS car...


K.

 

[Dusty Bradford]

I think what he is saying is that the PTC unit is a very efficient non-lock converter, that works very well both for spool-up and top-end mph. Something I'd like to try myself... If I still had a TSS car...


K.

Exactly. It's possible for the clutches to slip on the lock-up if something isn't right or you are over powering a single disk unit. This particular car run's mid 9's at 140 so we know it wasn't blowing through the Vig. Besides,these non locks haven't showed worse than 6% on any set-up yet.

 

[MSDGN]

Sorry hope this isn't off topic but what should the RPM drop after a shift be with an efficient converter....I shift at 6000 and mine is around 800 RPM's using an AC 9" NL "N" stall...I'm wondering if the converter could be contributing to a loss of MPH...and not the greatest 60fts

 

[WSLN 6]

That sounds good to me. I am using a 9/11 converter at the moment. It stalls at 3000 rpm at 0psi, and is a little doggy out of the hole. After 1st gear, I have no rpm drop at all...., just 5800rpm the whole run until I lock my converter, then there is a 1400rpm drop...
Gee, I wonder why I snapped a forward drum when I hit the switch.

 

[bison]

Sorry hope this isn't off topic but what should the RPM drop after a shift be with an efficient converter....I shift at 6000 and mine is around 800 RPM's using an AC 9" NL "N" stall...I'm wondering if the converter could be contributing to a loss of MPH...and not the greatest 60fts

Thats not that good by todays standards. PTC has set the standard for affordable converters. Id bet you would get another 400 drop out of a PTC. The one in my sig is like yours but less stall and its one of the better AC's ive used. The PTC unit will blow it away no doubt. Ill be buying 2 of them in the next year.

 

[bison]

That sounds good to me. I am using a 9/11 converter at the moment. It stalls at 3000 rpm at 0psi, and is a little doggy out of the hole. After 1st gear, I have no rpm drop at all...., just 5800rpm the whole run until I lock my converter, then there is a 1400rpm drop...
Gee, I wonder why I snapped a forward drum when I hit the switch.

Your driving through the converter.

 

[WSLN 6]

True story! lol. It has found a new home already. I have been talking to Dusty already about a new one.........:smile: Now I just need to find a good tranny...

 

[ryan george]

what does that mean? driving thru the converter. thanks.

 

[V6POWER]

what should the RPM drop after a shift be with an efficient converter

I would like to know the same. I have a PTS 9/11 and I see 600-700 rpm drop at WOT l/u. Is this good or not?

 

[BEATAV8]

what does that mean? driving thru the converter. thanks.

It means you are making so much power that the converter isn't coupling it efficiently, and you could end up running out of available engine RPM before you hit the end of the track. A more efficient converter will couple better, and you will be able to use your available power / rev range to improve ET and MPH. I was told 800 RPM drop on a shift is pretty good, but it seems like the really good converters can do much better.

 

[BEATAV8]

I would like to know the same. I have a PTS 9/11 and I see 600-700 rpm drop at WOT l/u. Is this good or not?

Considering my single disc only dropped 300RPM I would say your's is probably a pretty good drop for a WOT lock up event.

 

[TurboDave]

Considering my single disc only dropped 300RPM I would say your's is probably a pretty good drop for a WOT lock up event.

300 rpm My guess is you're driving right through that clutch!!

 

[BEATAV8]

300 rpm My guess is you're driving right through that clutch!!

Yup it wouldn't like too many more of those... that 11% slip is with it locked. it's 18% unlocked!

 

[Turbo1dr]

it's 18% unlocked!

Since you're running the stock computer and 28" tall tires have you changed your speedometer gears out so your MPH is reading accurate? Your actual speed is MORE than your power logger shows since the car is set up for 26" tall tires. This will effect converter slip numbers. Am I correct?

 

[Alky V6]

Lets not forget guys that a slipping clutch pack or band in the transmission can contribute to any drivetrain slippage calculation.

 

[TurboDave]

Lets not forget guys that a slipping clutch pack or band in the transmission can contribute to any drivetrain slippage calculation.

Ya, but I'm using your tranny, so it shouldn't be an issue, right?

 

[bison]

Lets not forget guys that a slipping clutch pack or band in the transmission can contribute to any drivetrain slippage calculation.

Yes but the trans would go to hell fast if anything was slipping like that. Especially in 3rd. The oil would be crap after on pass with it slipping.