383lt1impala

iTrader: (33)

Hello all. I recently put a fully built 383 ls1 behind my jeep m715 with a4l80e that was behind a 6.5 diesel. I got it running today. Took it for a drive it but when I nail it. It doesn't go to the rpm as it should. In other words it's a dog. Could it be the converter? Thanks any help is greatly appreciated.

rickybobbyss

a 3800 stall would fix that

vwdave

iTrader: (3)

Diesel converters are extremely low stall. Especially when paired with a gas engine. As a matter of fact, alot of diesel guys put lower than stock stall speed converters in their truck because the added power will make it stall higher.

dezlfrek

iTrader: (1)

yes, stall is way to low I would think, we lower stalls to trans more torque in the rpms diesel operate most, below 2500rpm so a 1500rpm stall is about right with around 600ft/lbs.. not gas range..

383lt1impala

iTrader: (33)

Hmmm that's probably the problem. When I'm going it doesn't want to let the motor rev past 3000rpm but in neutral or park it revs just fine. I don't know much about converters and how they can affect the drive of the motor.

dezlfrek

iTrader: (1)

can you hold it in first gear while driving and it still wont go past 3k letting it rev out?

383lt1impala

iTrader: (33)

It's a 4l80e but with a manual box. I have to shift it. It won't on its own. And it struggles so much to get to 3000. I don't want to force it more right now since it's breaking in.

dezlfrek

iTrader: (1)

sounds like you have a tuning issue, a tight converter will make it not want to idle easily like making the car move forward or want to kill the motor. Then when you get rolling would be like almost having a manual but would still rev out before you have to shift..

383lt1impala

iTrader: (33)

Idles good. And in park or neutral revs. To 7000 real nice.

dezlfrek

iTrader: (1)

just because it will free rev doesn't mean the tune is right.. if it was to lean or to rich it wouldn't want to "pull".
a stall will only affect how you go from basically 0mph to once your rolling. It will bog or lag if its low unless that's what the motor combo likes.

383lt1impala

iTrader: (33)

I need an afr gauge anyways. I'll see how the engine it's self is running

performabuilt

iTrader: (25)

I would not be to quick to say converter agreed it sounds like engine running tune issue under load . But indeed the stall you have is very low.
Frank