Stall Speeds N/A vs. FI
Stall Speeds N/A vs. FI hey gang,
ii should have my motor soon to do my hybrid swap with a 4l60e. i am not going to be able to do the turbo set up right away, but i wanted to get some of the common bolt on stuff asap so teh car would be ready once the turbo arrives.
one big q i have is about choosing a stall speed. i see a lot fo people are very successful with n/a bolt on cars with 3500's and i know i can live with taht since my friend has one and i know how it drives. would this be a good convertor for a fi package as well as n/a? i would rather choose a convertor leanign more towards the boosted plan if there is any difference.
the only big thing going into the motor is an LS6 cam if that woudl make any major difference.
thanks
tim
ii should have my motor soon to do my hybrid swap with a 4l60e. i am not going to be able to do the turbo set up right away, but i wanted to get some of the common bolt on stuff asap so teh car would be ready once the turbo arrives.
one big q i have is about choosing a stall speed. i see a lot fo people are very successful with n/a bolt on cars with 3500's and i know i can live with taht since my friend has one and i know how it drives. would this be a good convertor for a fi package as well as n/a? i would rather choose a convertor leanign more towards the boosted plan if there is any difference.
the only big thing going into the motor is an LS6 cam if that woudl make any major difference.
thanks
tim
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Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Get your stall for the performance you want. But, you may need a higher STR (Stall Torque Ratio) than those converters designed for N/A engines. For example, the PY3400 pulls harder off the line for cars with plenty of cubes or boost or nitrous. A SY3500 for instance, with a lower STR, while maybe more efficient, will probably be too loose off the line.
Originally Posted by Black LS1 T/A
Get your stall for the performance you want. But, you may need a higher STR (Stall Torque Ratio) than those converters designed for N/A engines. For example, the PY3400 pulls harder off the line for cars with plenty of cubes or boost or nitrous. A SY3500 for instance, with a lower STR, while maybe more efficient, will probably be too loose off the line.
thanks
tim
You are building a mostly street car right? Anything over 4000 total stall is not as street friendly.
My Yank is originally a UT4500 that did 5500 on a radical nitrous car. Got it after it was tightended up 1000 and it does 4300 in my car.
My Yank is originally a UT4500 that did 5500 on a radical nitrous car. Got it after it was tightended up 1000 and it does 4300 in my car.
FWIW, stall speed increases with the square root of torque increase.
Stall speed in a turbo car is not any easy thing to specify, nor is an NA converter setup similar to a turbo converter.
IMO, get a converter properly sized for the turbo setup now and deal with the fact it will be a lower stall NA that you'd probably like. You'll be happier in the end
Stall speed in a turbo car is not any easy thing to specify, nor is an NA converter setup similar to a turbo converter.
IMO, get a converter properly sized for the turbo setup now and deal with the fact it will be a lower stall NA that you'd probably like. You'll be happier in the end
Originally Posted by Pro Stock John
You are building a mostly street car right? Anything over 4000 total stall is not as street friendly.
My Yank is originally a UT4500 that did 5500 on a radical nitrous car. Got it after it was tightended up 1000 and it does 4300 in my car.
My Yank is originally a UT4500 that did 5500 on a radical nitrous car. Got it after it was tightended up 1000 and it does 4300 in my car.
it almost sounds like i shoudl wait to see what kind of power the car makes before i pick up a tc.
thanks for all the advice guys.
later
tim
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Most folks notice converter over 3500.
I have had a few.
4400 stalls get to be noticeable. Car might not roll until like 2500 or 3000 rpms. Just passing that on in case you never had one that big before.
I have had a few.
4400 stalls get to be noticeable. Car might not roll until like 2500 or 3000 rpms. Just passing that on in case you never had one that big before.
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how much does the weight of teh car effect teh stall speed i will see? i was lookin at teh info for the cars of all who gave advice and you guys rock some weighty rides(trucks and 4th gens), my car is lookin to be under 3000lbs, closer to 2900 once it is track worthy(gotta love 3rd gens 
)
i am trying to come up with some sort of prediction of my power level but it is difficult. i am doing all teh bolt ons, hp tuners, ls6 cam, and a 4-6psi single turbo with FMIC. does 400-425 to the wheels sound right through a 4l60e to you guys?
is there anyplace you guys would recomend to have a custom stall done for my specific needs?
thanks again
tim
) i am trying to come up with some sort of prediction of my power level but it is difficult. i am doing all teh bolt ons, hp tuners, ls6 cam, and a 4-6psi single turbo with FMIC. does 400-425 to the wheels sound right through a 4l60e to you guys?
is there anyplace you guys would recomend to have a custom stall done for my specific needs?
thanks again
tim
