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Old 09-16-2010, 04:23 PM
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how to restore hp and tork

lost tork and hp on my 350 eng,,had a 4.10 in it change over to a 3.42 it lowered my tork and horse power.the eng is a 350 , 74cc heads ,headers , 600 cfm carb,rollrocker arms .and a sumitt cam intake@.465 exh .488 ,tran th350 with b/m shift kit in it ,flow master mufflers.the 3.42 rear end lowered my rpm at least 800rpm or more .if i install a tork converter 2200-2500rpm stall will that bring back my hp/tork that i lost if not what other soulutions do i have. please advise

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Old 09-16-2010, 04:36 PM
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???
You dindent lose anny hp our torq by change your gears.The power in the engine are the same.But your performace get wors becous your engin revs les and it ofcours produces less hp at lower RPM...You prety mutch have 2 sulusions, eader change engin for one that produces mor power on lower RPMs or change back to your 4.10 gears.If you want lower RPMs on the higway you culd change your th350 for exampel a th700 insted of changing rearaxel gears.
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Old 09-16-2010, 05:00 PM
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Originally Posted by Johan Lokander
???
You dindent lose anny hp our torq by change your gears.The power in the engine are the same.But your performace get wors becous your engin revs les and it ofcours produces less hp at lower RPM...You prety mutch have 2 sulusions, eader change engin for one that produces mor power on lower RPMs or change back to your 4.10 gears.If you want lower RPMs on the higway you culd change your th350 for exampel a th700 insted of changing rearaxel gears.
Nailed it Johan.

You lost the torque "multiplication" of the 4.10 gears. Gears will make the biggest bang for the buck change in vehicle performance you can get. I would have kept the 4.10 gears and swapped the trans for a 200-4R or 700R4. A converter won't hurt but it isn't going to come close to making up the difference.
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Old 09-16-2010, 07:01 PM
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X2 What Johan and Hippie said.


Cole
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Old 09-16-2010, 07:16 PM
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Quote:
Originally Posted by orion2
lost tork and hp on my 350 eng,,had a 4.10 in it change over to a 3.42 it lowered my tork and horse power.the eng is a 350 , 74cc heads ,headers , 600 cfm carb,rollrocker arms .and a sumitt cam intake@.465 exh .488 ,tran th350 with b/m shift kit in it ,flow master mufflers.the 3.42 rear end lowered my rpm at least 800rpm or more .if i install a tork converter 2200-2500rpm stall will that bring back my hp/tork that i lost if not what other soulutions do i have. please advise
Go back tp 4.10s or get used to 3.42's or rebuild the engine around more compression, and bigger carb and cam. Then you can use a higher stall converter.

All a high stall converter does is let the engine rev to a higher RPM before it connects the vehicle to the crankshaft. For a drag vehicle this works like a slipper clutch. But in both cases once the stall or slip is used up the engine and vehicle get connected in the usual more than less solid way. This helps coming out of the hole, especially if the machine doesn't have low enough gearing or helps control wheel spin if it does. But once hooked up it just business as usual.

Bogie
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