Alrighty, will do - thanks!

 

Im not sure Nelson can do anything about that.

 

NO.

it pretty much helps you from a launch. it won't really benefit you while cruising down the road except when it upshifts from 1st to 2nd, it does at a higher RPM. the RPM's dont drop that much between shifts. you will notice a little more pull, but not much

 

Hmm, interesting.

 

what do you want to accomplish with a TC? it won't help with towing. the TC is built for one specific reason. quick launches. it puts your RPM's in the higher band range to increase HP from a dead stop

 

Okay, I've done a little more reading. It seems the main reason for a TC is to get the vehicle in the powerband where torque is the highest. This is mainly what I was after.

However, what I noticed after taking my truck to the dyno (even after the Radix install) was that my torque seems to peak very early on (in RPM's) and then decrease steadily, while horsepower goes up as RPM's go up. I imagine that most LS1's are the same. Of course, at the dyno I was shifting at 3K RPM's, so I don't know what the curves looked like before that.

Actually, the TQ curve was fairly flat (with HP steadily increasing), but seems to peak early on and decrease slowly over the RPM band.

So are we multiplying torque, or horsepower? Cuz' if we're multiplying torque, it seems to be best to stay low in the RPM's, which would lend itself to favoring the stock converter with a stall of 1600-1800 RPM's.

Does anyone have any LS1 HP/TQ curves that show at what RPM TQ is the highest? I guess real-life dynos would be great, but factory charts would be useful, too. I'm really trying to figure this thing out.

 

just go for it. you won't be disappointed. get the yank3000

 

I think the torque peak for a NA 5.3 is ~4200rpm

 

Here's a pic of 2nd gear from 5 dyno runs, only one run was started in 2nd gear (the operator had me shift from 1st to 2nd for the other four, that's why they start at approx 4100 RPM).

As you can see, at 3K RPM, I have ~315 lb/ft TQ. At max, which is about 3750 RPM, TQ is 330 lb/ft, only a 15lb/ft difference.

Pretty flat. If I don't care to much about tire-roasting launches, I don't think I'd benefit much from an aftermarket TC.

 

I had a 2600, when I hit it from a stand still it was like being shot out of a cannon. I have the factory one in until I can afford a built tranny and there is no comparison between the two. Go with the 2600 and you will be amazed.