i know a guy with a SY4000 with a 1.86 stall ratio. what exactly is the stall ratio and what is a preferable one to have? since i'm pretty sure my stock stall is toast i'm leaning toward something like a PYE 3600 or something comperable. whatever it is i want atleast 3600 stall. lets talk about this guys.

 

The 1.86 is going to hit a bit softer on the street than a 2.20-2.60 STR...STR is stall torque ratio if my mind serves me. It is how much the input torque is multiplied at the stall speed. The lower the STR the more efficient it will be from a roll also...not by much. Stock converters are 1.8-1.9 STR usually.

A 4000 stall is pretty damn big and you'd have hard-core traction problems and won't be able to tow anything. But you will haulass from the hole for sure!

What's the diameter of that converter?

 

Ditto what Hit Man X said.

That converter is gonna be LOOSE in a truck. I've heard it's pretty loose feeling in the cars so add the weight of the truck in and

Loose converters are easier to launch on the street since you don't get the full effects as quickly as a tight converter. You'll still have to roll into the throttle with either but, most of the time you can roll into it harder with a loose converter.

If you're considering a healthy shot of N20 then the PYE 3600 is probably a better choice. I don't think the SY4000 was intended for that type of application, more a HARDCORE street/strip N/A converter.

I've got a PYE3600 that will be going in my truck but, don't have a install date yet.

Both of these converters are 258mm.

 

sweet xlr...i think i'll pass on the sy4k then and go with a PYE 3600, i know the PYE will take some abuse, that's what MIX had in his truck and he ran 300 shot on it and launched that big ole truck of his pretty good, it shouldn't have a problem with my little truck.