Torque Convertor ?

[tocchinero]

what kind of stall speed should should i be looking at for my 306 w/ TF Twisted Wedge and track heat upper and lower plenum, crane roller rockers 1.6, and looking into cam now.

any replies will help.

thanks

tom

[silver_pilate]

I'd go with a 3200 rpm lock-up converter. 2800 works with a near stock to fairly modified Mustang, but with your heads and intake, I'd bet your powerband is coming on more in the upper rpm's starting close to 3000. However, alot is going to depend on the cam profile you chose. Decide the cam first, figure out where you're making power, and go from there.

--nathan

[ponypower]

I would recommend calling a good converter company and give them all your specs, cam, heads, intake, rear gear, tire size etc. If they don't ask I wouldn't buy it. A good converter will make all the difference. Art Carr, PA, Precision Industry (stallion) are all good. I used a 2800, 9" stallion in my last set-up, AOD, 26" slick, mild motor and 4:10 gear, and it rocked.
Good Luck

[Rev]

If this is a street driven car, you will want a stall speed lower than your cruise RPM. Otherwise, you'll have slipage even at highway speeds causing heat, wear, inefficiency and problems.

Rev

[silver_pilate]

Shouldn't matter with a lock-up converter, because your directly coupled in 3rd and 4th gear.

--nathan

[tocchinero]

thanks for the replies, also im going with the Trick Flow Stage 1 cam. And also, silver pilate are you saying i need a lock up coverter or should i get a non-lockup? Its for street use and on the weekends track use.Thanks again

Tom

[Shaggy]

You will be faster with a non-lockup BUT if you do that then you start running into what Rev is talking about and you start cooking trannys. I would go with a lock up style since you are talking primarialy street aplication plus with a lock up you can get a 3500 stall to get you out of the hole like a rocket but once you shift to 3rd then you are locked in and can cruise at 1500rpm if you want.

The reason you would be faster with a non-lockup is when you are racing the advantages of a proper torque convertor are lost once you shift into 3rd. IE when I go down the track in my car I launch between 35 and 4000 depending on track conditions (footbrake, 10" convertor) then shift out at 6000 to 2nd and shift out to 3rd at 5500, as loose as my convertor is I loose about a 1000 rpm between 1/2 and about 500 between 2/3. In your application with a lock up assuming same set up I have except lockup convertor you would loose the 1000 between 1/2 but close to 1500 between 2/3 because the convertor locking up and driving the tranny one to one so typically unless you are running big cubes or a power adder that has created a super flat torque crve to pull you through the extra rom lost between the 2/3 shift then that is will you loose you little extra "oomph"