PSI,

Stage 3 has a different HP / Torque curve than S2 - so I do realize your car will be different. I only use the S2 as an example because it is what I am running. For S2 though with toys, the HP drops off slightly after 5200 rpms (granted, I realize every car is slightly different and different mod's with vary this number)... the point is, you should shift at optimum HP for your car, not necessarily red line...

http://www.mopar.com/img/dyno_srt4_s2.gif hopefully this link works...

if not: http://www.mopar.com/street/products_srt4_stage2.htm and click on the graph.

 

yes, but i had s2 as well. i know what the power curve is for that set up as well. i still never nor would ever shift that low. with s2 i shifted at about 5800-5900 rpms, wot.

shifting at 5200rpms, while i have never tried it, i would imagine would create more lag after the shift. rpms would probably drop pretty significantly, and would probably create a loss of positive boost beacuse of it. even people who don't wot at the track shift in the top of the gear. remember that when you shift at 5200, you're going to drop out of the power range after the shift. by keeping the car going further up in rpms, you're allowing the car to be at a higher rpm after the shift, thus bringing you back into power range much faster. you don't shift and keep the rpm at a constant state.

 

I agree with what you are saying, and maybe the 5200 is a bit low (upon reviewing the graphs again, i would tend to agree a higher rpm should be used, but not as high as red line or such... 5600-5800 seems to make more sense to me upon review). The point though is still, shift at optimum HP to get you into the optimum torque range after the rev's fall. By shifting near the optimum HP range the car should drop enough rev's to keep you in the ~3800-4400 torque range without missing anything. granted, I am basing this on theory and lack definitive track proof, so I am open to suggestion, especially since you have raced with S2 & S3 if I recall ...

my basic point though is - WOT shifting at redline isn't helping you - you should be shifting closer to the max. HP rpm

 

i don't think anyone is shifting at redline. 6100rpms on s2 or 3, and 5900 on s1 are what most people are using as shift points. these are far enough away from redline that you shouldn't hit spark cut when shifting but still give you room to stay in the higher rpms when shifting. i'll have to remember to watch where my rpms fall to after a shift next time i'm at the track. from what i recall, i don't think i ever go below 4k once i get moving, but i'll keep any eye on it and see where exactly things fall to.

i understand what you're saying about keeping it in the power band, but it's kind of a trade off. you stay on it a little more than what the numbers tell you, which loses a few hp, but allows you to keep momentum and stay in efficency range through more of the track.

 

valid points.. I appreciate the info

turbo'd cars are still a tricky beast with me... let alone FWD and 4-door'd... ha-ha... keep us informed PSI!