OldGold

iTrader: (1)

So, I have been watching my videos of running Matt's Fairmont and I noticed that the converter was locking later in 3rd than anticipated. I also noticed that it drags the rpm level down to about 6,000 at the traps. Matt was going through higher, because he was spraying the car on most passes. He also thinks the motor makes peak power at roughly 6400 rpm. I figure if I don't lock the converter on the race tune, I could pull it higher into the powerband in 3rd. Or, do you think the direct drive of a locked converter is more beneficial? If that is the case, I would lock it as soon as I went into 3rd.

Ideas?

Mike

OldGold

iTrader: (1)

Also, guys that have lockup converters, where are you locking yours?

jjcamaro02

iTrader: (34)

I lock the converter up in third but not until about 115 mph. I have tried a few different ways and if you lock it up to early you will lug the motor down.

atomic 6

Exactly.

I lock the convertor, around 6100 rpm in third(about 112 mph), you don't want to lock it too soon, as said it won't make it quicker.

I had to experiment to get the right balance of drop in rpm,and loading.

OldGold

iTrader: (1)

Ok, well the lockup drags the rpm down by 500. It is clearly seen on the tach during a pass. I was thinking of locking it at around 80, when it hits third. That would probably drag it down to 5200 or so. I was also thinking of upping the shift points from 6200-6400. Right now it is supposed to lock at 110, but does not lock until around 120. It seems to lock around the 1,000 foot mark. To me, that is not enough time in lockup. But, by the same token I don't want to lug it down too much.

jjcamaro02

iTrader: (34)

Yes the converter will start to apply but it takes time to fully lock. I think 5200 would be to low, you also don't want it to lockup below your peak torque.

OldGold

iTrader: (1)

Well, I really don't know where it makes peak torque since Matt rarely ran a tach signal when on the dyno. I guess I will stick it on the dyno next weekend (local dyno day and there are a bunch of people that want me to roll) and see where the peak torque and hp occur.

Mike

denmah

iTrader: (2)

locking it fairly late has always worked good for me.

we tried locking it earlier in the truck without better times.