well i found a sweet deal on a built 4l60e (artcarr parts, but built at aamco) and it has a 3000 nonlockup converter.... hes selling the whole thing for a grand (the tranny has less than 1000 miles, car was getting repoed, so he took some of the stuff out of it before it got repoed) he told me he has run mid low 11s on juice with this tranny and it has less than 1000 miles, he only had it for 2 months....

Well, i thought this was a lock up, but i made him find out, and he told me its actually a nonlockup.... now all i know about nonlockup are 2 things....

better ETs, maybe more mph (not sure) but ur mileage goes to crap.... (which mine already is lol)

this is my daily driver, and i drive this car everywhere.... what do you think I do? forget the tranny, or get the tranny with the nonlockup....

also doesnt nonlockup trannies show lower dyno numbers?

thx!

 

a non lock up tranny will slow a turbo car down

I recomend calling art carr and asking them theyre opinion.

www.artcarr.com

 

ah ok

thx taz

 

AFAIK, the 4L60E will not lock up the converter under WOT, and in a powerful car you wouldn't want it to. The lockup clutches are simply too small to absorb the kind of hp you are making with an 11psi turbo setup. You still will probably want a lockup converter if the car sees much street time. Locking up at part throttle will improve fuel economy, and decrease wear on the motor and tranny when cruising.

I seem to recall that Precision Industries (Vigilante) advertises their converter as capable of locking up with up to 800hp or therabouts. But even at that level I wouldn't think it would be durable enough to go through too many lockup duty cycles. And an 11psi turbo with "bigass" heads and cam ought to be in the 1,000hp range anyway. Ever notice that track only cars don't have lockup converters? Theres a couple of reasons, and the abilty to absorb the stress of locking up under WOT is one of them.

Rich

 

Art Carr seems to disagree, they say that their triple disc converters will handle well up to 1200 HP locking up. You can tell the PCM to lockup the converter at WOT with LT1 Edit. I lock my converter up in the top of 2nd, all of 3rd and 4th. But I also dont make 1000 HP.

 

I don't doubt the PCM can be reprogrammed to lock up under WOT. But as I explained, there is a reason it is not set up to do this. As far as a lockup converter good for 1,200hp, I suppose it's possible but I am skeptical. In any case, since a 4L60E won't handle near 1,200hp (by about 1/2) I guess that's a moot point. Do you see these 1,200hp lockup converters at the track? I have not, which either means we are missing something or that they don't work.

Rich

 

well they use the same internals on their 4l80 converters which is why they are rated so high. I wasnt trying to say you were wrong at all, I was more double checking what Art Carr told me. Basically I want to lock up my converter at WOT in 2nd and 3rd gear because my motor is more high RPM And HP based and I am actually 2 mph and 2 tenths faster locking up the converter. They claim it will handle it, are they wrong ? Did I do something wrong to be one of hte few locking up ? Art Carr says they do teh same type of package for turbo cars to make them faster. Jsut asking your experience, not doubting your opinion.

Thanks,
-Taz

 

the cam/heads i have isnt 'bigass' arent enough to make 1000hp...

if i was making 1000hp, i really dont think i'd have a 4l60e either lol

look more at 600hp range which is still pushing it imo

 

At that hp level you will be ok with locking up in high gear. I don't think it would help in 2nd, but if you have tried it and it does, so be it.

Rich

 

pulled out my timslips, I was actually 3 tenths faster and almost 2.5 mph faster with lockup. all runs were made on the same day