redline/peak H.P/ & H.P curve-When to shift?? :) intresting???

DarkJak

Unless your power drops off somewhere like 20-30% after peak, it'd be best to stay in as low a gear as possible since the lower gear ratio will put down more torque.

__________________
@stupidtoycars | My track vids
09 7AT|MCS 2WNR|Topgunz Rotrex|Ecutek (Eugene)|Maxxis RC1|Titan-7 TS-5|OSG LSD|Rear Mount Derale Oil Cooler (WIP)+25 Trans Cooler|Fismo|G-LOC R12/R10|Zeta III L|NLR Wing and Splitter|CJM Pan and Fuel Hat|Radium Surge Tank|AP Racing CP9668

andre12031948

I guess I should have said going 1/4 & using 4 gears. Sorry. The first person DEpoint50 got it real close & very quickly. The only thing I had a problem with was "absolute highest RPM you can". That is not the case, but he does understand the drop of rpm after every shift. I'll give my answer on Monday. If anyone cares The other forum had a lot of problem with these basic stuff. So what's the point of spending thousand to mod a car for going quickly when one doesn't understand basic stuff like when to shift & why.

andre12031948

As we all know, after shifting the rpm drops. In order to get the max benefit, we need to keep the car's highest h.p the longest time in that drop. Example, if your highest h.p is at 7,000rpm then starts to drop, & because of your gearing(trans. & rear) it drops 2,000 rpm. You draw/pick a line from the dropped side & draw it to the other side (horizontal) where it starts getting going up to the highest h.p. Of course it should cover only 2,000rpm. You should now have THE MOST h.p the car makes in that 2,000 rpm space.

So highest h.p is at 7,000 rpm, shifting at 8,000 rpm & it drops to 6,000 rpm might do the trick. The reason I say might is because the h.p curve on the dyno chart might show that that will not have the most h.p in that range.

That is why I prefer a set up & tune that shows a long flat h.p. peak than a quick going up, then a quick drop. I'd prefer even lower top h.p if the top h.p stays longer(flat curve) but last longer!

Almost 3 years ago I made a youtube video of my shifting, where it clearly shows the drop. Just put my name andre12031948 & click.

Of course one should always consider the safety of shifting at high rpm. 07/08 HR's like mine, shifting at 7,500-7,600rpm is fine, I believe the 370 engine can be shifted safely at 8,000 rpm.

Oh yes, getting gears like 4:08's makes the drop smaller & brings the rpm back up much quicker. Result much more kick in the azz on the street & muck quicker times. My youtube video was made before I started heating my tires in water & had my 3:90 gears, not my 4:08's.