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stall to high ????

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  1. #1
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    black
    1998 trans am

    stall to high ????

    Anyone,
    Had a discussion today about stall converter sizing, Iím in the market for one for my 98 bolt-on. I was looking at a 35-3600ish stall, the individual said I didnít know what I was talking about 3500 on a ďstockĒ car is to high said I should not go over 2400ish. I have always sized my stall about 700 rpm under peak torque, and Iím 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 itís 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

  2. #2
    Moderator Firebirdjones's Avatar
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    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.

  3. #3
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    +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.

  4. #4
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    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.
    67 Camaro: K-K + 797-z (look it up), 454/Th400/4.10 12-bolt = 6mpg, PS/PDB/PW tilt, tach, gauges...

    2005 Corvette LS2/M6 Magnetic Red Metallic (What else would it be?) w/ Cashmere interior

    2002 Z28: NBM/Tan, MTI smooth lid, smooth bellows, !AIR, !cats, 1-3/4" QTP SS LT's, 2-1/2" TD's with X-pipe, MagnaFlows dumped at axle, custom welded SFC's, MidWest Chassis body mount adjustable T/A, 3400 stall, 3.23 gears (was 2.73). Tuned: 343rwhp/357rwt (before TD's). Best: 12.559 @ 108+, 1.73 60' @ 3500' DA w/MT ET Street DR's.

    Carbon footprint? CLOWN SHOE!

  5. #5
    Junior Member LS1Mac's Avatar
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    DK. Blue Metallic
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    Quote Originally Posted by rc74racer View Post
    +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 .
    2002 DBM SS Camaro
    11.37/120.10 1.54 60ft
    Yank/243's/ F13 Cam/3.73 Motives/ full weight/Stock LS6 Intake/ TunedbyFrost

  6. #6
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    black
    1998 trans am

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

    Thanks again.

  7. #7
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    metallic pewter, red
    2002 Z28, 1972 Z28

    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.

  8. #8
    member since may 2000 nhraformula's Avatar
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    2000 nhra edition formula

    I have a 3000 stall and kick myself for not getting a 3500 rpm convertor
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  9. #9
    Senior Member Z28_Driver's Avatar
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    Sunset Orange Metallic
    2002 Z28 Hardtop

    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.

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