converter for blower application
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
converter for blower application I've always been a nitrous and N/A guy and going bigger on the converter stall never left me unsatisfied. This is my first boosted application to match a converter to. I've already decided that i'm going with Pro Torque, so I'm not looking for suggestions on who to go with. The combo
10.5:1 408 stroker
PRC as-cast 257cc ls3 heads
3.6 kenne bell @14-16 lbs boost
226/246 .629/.629 118+4
1 7/8 headers, dual 3.5 exhaust
4l80e with trans-brake
3300 weight?
34x22.5 tires
3.55 gears (willing to change)
the options for converter is 2800-3200, 3200-3500, 3500-3800.
10.5:1 408 stroker
PRC as-cast 257cc ls3 heads
3.6 kenne bell @14-16 lbs boost
226/246 .629/.629 118+4
1 7/8 headers, dual 3.5 exhaust
4l80e with trans-brake
3300 weight?
34x22.5 tires
3.55 gears (willing to change)
the options for converter is 2800-3200, 3200-3500, 3500-3800.
Teching In
Joined: Nov 2019
Posts: 47
Likes: 2
I've always been a nitrous and N/A guy and going bigger on the converter stall never left me unsatisfied. This is my first boosted application to match a converter to. I've already decided that i'm going with Pro Torque, so I'm not looking for suggestions on who to go with. The combo
10.5:1 408 stroker
PRC as-cast 257cc ls3 heads
3.6 kenne bell @14-16 lbs boost
226/246 .629/.629 118+4
1 7/8 headers, dual 3.5 exhaust
4l80e with trans-brake
3300 weight?
34x22.5 tires
3.55 gears (willing to change)
the options for converter is 2800-3200, 3200-3500, 3500-3800.
10.5:1 408 stroker
PRC as-cast 257cc ls3 heads
3.6 kenne bell @14-16 lbs boost
226/246 .629/.629 118+4
1 7/8 headers, dual 3.5 exhaust
4l80e with trans-brake
3300 weight?
34x22.5 tires
3.55 gears (willing to change)
the options for converter is 2800-3200, 3200-3500, 3500-3800.
Depends upon goals. With a big inch motor, baby cam, and low end torque monster blower you will not “need” something in the 3500 plus range.
Guy I know has a 421 inch lsx with a twin screw in a heavy car and has good success with a 2800 converter.
Different needs than a 5.3 with a turbo.
Guy I know has a 421 inch lsx with a twin screw in a heavy car and has good success with a 2800 converter.
Different needs than a 5.3 with a turbo.
Honestly I don't think this is a pick one and done deal.
Intended use will play a role and the transbrake in the 4L80E says you intend to race it so a higher stall would probably be the way to go.
With that said, I would lean on Pro Torque to give you an idea of what stall to select, then be ready to pull the converter back out and have them tweak it for optimal performance.
I had to do just that with my Circle D unit (they've been great to work with) as each combo is a little different and might take a couple tries to see what it likes.
Intended use will play a role and the transbrake in the 4L80E says you intend to race it so a higher stall would probably be the way to go.
With that said, I would lean on Pro Torque to give you an idea of what stall to select, then be ready to pull the converter back out and have them tweak it for optimal performance.
I had to do just that with my Circle D unit (they've been great to work with) as each combo is a little different and might take a couple tries to see what it likes.
Did they spec it for the blower? For a positive displacement blower you really want a tight-ish converter, They make great low end torque so as long as your stall is above where you might have cam related drivability issues then your good. As someone else mentioned, It depends on your intended use.
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Teching In
Joined: Nov 2019
Posts: 47
Likes: 2
Did they spec it for the blower? For a positive displacement blower you really want a tight-ish converter, They make great low end torque so as long as your stall is above where you might have cam related drivability issues then your good. As someone else mentioned, It depends on your intended use.
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Joined: Nov 2019
Posts: 47
Likes: 2
Dropping down to 5000 rpm on the gear change isn’t as big of a problem with a big inch motor with a positive displacement blower. On the extreme end that would be a big deal with a 5.3 and a centrifugal. Each combo has different needs and the people building his converter know this. No sense in having massive off idle torque if you’re blowing through it with a loose 3800 converter.
You can always look into locking up the converter once you're moving too.
I know several guys that have a triple disk unit that locks up the converter in 2nd and 3rd at WOT.
They say it drops the RPM down 300-400 rpm and the car just flat out rips when it locked, turbo cars though so that may change things a bit.
There's some transmission mods that come with it but might be worth looking into.
I know several guys that have a triple disk unit that locks up the converter in 2nd and 3rd at WOT.
They say it drops the RPM down 300-400 rpm and the car just flat out rips when it locked, turbo cars though so that may change things a bit.
There's some transmission mods that come with it but might be worth looking into.
The converter you ordered might be perfect for you the only way to tell is to run it.