stall to high ????

[seweber]

Anyone,
Had a discussion today about stall converter sizing, I’m in the market for one for my 98 bolt-on. I was looking at a 35-3600ish stall, the individual said I didn’t know what I was talking about 3500 on a “stock” car is to high said I should not go over 2400ish. I have always sized my stall about 700 rpm under peak torque, and I’m guessing peak torque is just over 4400 rpm on a bolt-on ls1. I have 3.70 gears add some weight shaving, but have never dynode this car. I explained that I knew you could put to high a stall into a car and kill transmission (heat) and ET times but the LS engine make torque higher than most small blocks from the 70s and 80s even early 90s, and having the gears and weight under 3300# figured I was spot on, some people might even think it’s a little low depending on the converter brand. I have found a lot of info both ways on the net. Not to knock em but this guy does drive a mustang and he is not happy with a friendly grudge match we had at the local drag strip. Does anyone have a similar ride with a stall or just input.
Thanks

[Firebirdjones]

You are right on the money with your thinking.

LS1's just don't make alot of low end torque or come into their own until you are above 4,000 rpms. The combination of a 200cc intake runner head on a smallish 347 ci engine, along with a wide LSA on the camshaft makes for a softer engine down low.
To take advantage of that you will need a looser converter. Bolt on cars (no cam) will work just fine with a 35-3800 converter. I ran a pretty loose driving 3400 in mine for years and it was great. Could have used even more to extract the most out of it.

[rc74racer]

+1 your thinking is correct. The individual you were talking to has no idea what he is talking about when it comes to these cars. There are a lot of people that would recommend you go higher.

[67CamaroRSSS]

Also, todays cars use a "lock up" style TC. Unlike the old school stuff where lock up wasn't achieved untill RPM was reached todays cars lock up at a specified mph so if stall speed isn't reached it will still act like a normal converter.

[LS1Mac]

+1 your thinking is correct. The individual you were talking to has no idea what he is talking about when it comes to these cars. There are a lot of people that would recommend you go higher.

I agree. A 3500 or 3600 stall will work great and can also help with any mods you have planned for the future ( LT's , h/c, gear ) . Also don't forget to install a tranny cooler .

[seweber]

Thanks all, for all the advise……… + 1 future mods and on the tranny cooler its going in with the stall, At least a cam this winter.

Thanks again.

[1972_Z-28]

I love my Circle D 3200 on my dd bolt-on car. Of course most will say that 3200 is to low but i drive in a lot of stop and go traffic in the morning and it works great + 12.5-7xx cosistent is nice also.
Good luck on your choice and DO NOT forget tranny cooler, you may not need it as bad as us down here but I would still get one.

[nhraformula]

I have a 3000 stall and kick myself for not getting a 3500 rpm convertor

[Z28_Driver]

thats a nice stall speed for an LS1. Should be on the bottom side of the powerband.
Good luck with it and keep us posted on what you get and how it works.