5.9L Engine Club
#231
check this place out.... http://www.transmissionsone.com/
check all your o2 sensr wiring
#238
High stall converters are by name, increases the rpm where the converter converts fluid to drive under initial acceleration. This only happens for a few seconds after you give your vehicle the gas.
The higher rpm, or stall speed, fools your vehicle into believing you have lower gears for those few moments because avalible torque multiplication is increased.
Hi stall converters work well in heavy vehicles with realitivly small motors or vehicles with hi lift cams and street gears. The heavy vehicle helps increase the stall speed because the converter has to "flash" to a high rpm to start things moving. In undergeared vehicles with small cammed engines, the high stal also gets the the motor into its power band quickly at launch.
In summary...having a heavy truck with a high stall converter will help launch the beast and well built converters will increase the torque at launch, like low gears...
HOWEVER...
Like any other mod, there are tradeoffs. The most important one is HEAT. Hi stall converters produce more heat because at higher rpms they tend to float or dyna flow.
The second trade off is gearing. A vehicle with a high stall converter will see the benefits of said mod drop slightly as gearing is lowered. Thats because the converter isn't needed to launch the vehicle...the gears are taking its place.
My suggestion would be to purchase a converter based on your engine mods and try it with your current gears. After evaluating that, you may find a more modest gear change is sufficient. Either way, you will lose top end...the only way to get that back with gears is more rpm, and more horsepower.
This is just the basics...you should read up on the subject and most builders are willing to help.
Last edited by dsertdog56; 11-14-2009 at 09:53 PM.
#239
#240
Well I just replaced my plenum.... What a pain in the A$$, it took about 12 hours to do. Well it took 6-7 hours the first time, and when the intake started leaking after we put everything back together, it took about another 5-6 hours to pull everything back off and redo everything. The good news is it doesn’t leak anymore, and I just have to get an oil change now that some water/coolant got in the block. I am curious to see if I regain any power and gas mileage from this. And I hope that my oil consumption problem is fixed by this also. After do this my buddy said he will never help me work on my truck again lol.