Ok, so I've got 13 miles on the new motor so I felt I could lean on it a little . When I powerbrake it it just slides the car forward on the front tires! Yeah, I leave marks, but they are skid marks from the front tires sliding! From a standing start, bring it up to the stall (2800 or so) and floor it, the car just jumps forward. Good I guess? I was expecting to break the tires loose like mad at that kind of start. Granted, I am not pushing it too hard but still.. my specs: .030 302, rpm heads, speed demon 650, solid lift cam .575 at 280*, unilite dizzy, 10* initial with 33 or so in by 3000 compression at an even 10.1 (or so) Tires are 275-60-15 Drag Radials with pizza cutters on the front, 4.11's in the rear with a traction lok Runs great, was just expecting more torque.
Pobably not in the "powerband" yet. New motors always need sorting out to get the most out of them, you'll get it.
You are "Power Braking" in both scenarios - unless you're doing a Neutral drop. I'm with Bigbully on this one. I think your stall is relatively low to where you start making significant torque (enough to burnout). Do you have a tach to show you how high you can stall it? Your convertor might be listed at 2800 but that's really a relative term. It would "flash" stall higher on a heavier car or one with more hp. Those DR's are definetly going to hook. Are you doing this at the race track or are you on asphalt (or concrete)? You might try locking out the timing (if you haven't already done so) or advancing it a few degrees. I think you're on the right track though as 'easily spinning the tires' is NOT good. Could be that you're cammed to have your peak hp/torque in the upper band. I don't know what level of mechanical experience you have so - sorry if it sounds too basic. I'm no Master mechanic myself - just throwing out ideas. You'll get it all figured out at the track when you go to Test and Tune.
Rick, I have tried locking it out, still same results. I am flashing at 2800, converter is a 3000 stall. Doing it on a concrete pad. I do realize that both scenarios are powerbraking. I guess I should shut up and be happy it hooks and launches real hard. Neutral drop ? NO, not since high school!!! I do realize that I have built a motor that will be at its best from 3500-7000 rpms, just like to play once in a while also..
i would probably try 36-38 total timing. i believe in giving a motor all the timing it will take until it either slows up or slow cranks. then just back up a couple of degrees. some times this ends up being in the neighborhood of 40 degrees. find out what it likes. i do agree that your converter is too low for your engine. 3400-3800 stall would work great, but you might not like it on the street
I was looking for a good compromise (does that exist?) between street and strip with the converter. I had a 3800 and it was a bit much on the street. I have been running the "generic" Jegs converter for a long time and am quite happy with it..Thanks for the responses.. I am leaving for a vacation now!!!!!!!!
