Well, let me give ya little background info first. You can check my sig for specifics on my combo, but here are the details. My highest dyno to date (422.1rwhp and 518.6rwtq w/ 12.1 A/F) was back in Jan. on a cool day, before the addition of AC 2400 stall(which I believe cost about 15-20 rwhp on dyno due to slippage). I dynoed her again about 3 weeks ago and she made 403rwhp and 490rwtq in 95* heat and a 12.2 A/F. This is with 4psi lower and stock upper pulleys producing 12-12.5 psi boost.

Now to the KB. Terry(L8 APEX) installed her on Friday afternoon. In its current state of tune it has a mail order chip from JL. It has a 4#(8.75") lower and 3.5" upper producing just under 14psi boost. The A/F fell completely OFF the graph(BELOW 10:1 @ 4400 rpm and stayed there the remainder of the pull!) So to say the least, Johnny sent me a SAFE file. I'll be sending it back 1st thing on Tuesday with the corresponding data so we can get this thing where it needs to be. Keep in mind these are BASELINE #'s on stock long block w/ stock manifolds and cats. Here it goes...
3400....335hp...519tq
3600....340hp...519tq
3800....360hp...515tq
4000....375hp...510tq
4200....390hp...505tq
4400....400hp...500tq
4600....410hp...490tq
4800....420hp...470tq
5000....430hp...440tq
5200....438hp...420tq
5400....447hp...400tq
I don't have a scanner, so this is as close an idea I can give you. Given the INCREDIBLY FAT A/F I was happy with the baseline results. The "curve" was more of a "line" that continued upwards until we let off @ 5400rpm. Although mine and Terry's #'s were close at peak, due to his ported heads, cams, long tubes etc...His built motor absolutely SMOKED mine in terms of "power under the curve". I will say that the KB absolutely smokes the Eaton(relatively speaking) in terms of efficiency and literally pulls until you get out of it. I'm looking forward to getting her dialed in!

 

I do not believe a 2400 stall convertor will cause you to drop peak HP on a dyno.

 

That's fine. That's just what I've been told by several trustwothy sources (that work for tuner shops, do converter installs and have in house dynos) that are more familiar with stall converters and the general workings of automatic transmissions than myself. The way my truck has performed since the installation of the stall seem to support that theory. The 60fts. improved, but the trap speeds fell 1.5-2 mph in the 1/4mi. At any rate, I could be wrong(wouldn't be the 1st time!), that's just what I've seen on my particular application.

Peace,
Rob