When To Shift??

[Sargento69]

I have a b20b in my crx and i am wanting know is at what rpm should i shift???

[BLU CIVIC]

hmmmm...a guy in the 240 forum did the calculations for shift points....i'll have to search for it

[Sargento69]

If U Find Sumthing Post It On Here Please

[BLU CIVIC]

ok...i think this need to be a stickie...but i'll put it in the FAQ...from what i see...u have to take in a lot of variables to get your ideal shift points...so what would go for you wouldn't go for someone else unless their car was exactly the same...so break out your calculator

http://www.slowgt.com/Calc1.htm

[Sargento69]

Hey Thanks For The Help!!

[BLU CIVIC]

no prob

[civickiller]

whatever the stock shiftpoint is unless his engine is modified in some way and i dont mean bolt ons

[BLU CIVIC]

that calculation takes all those things into consideration

[civickiller]

too many factors to say that it would be taht for every single setup like that.

like i said stick to stock redline. only other real way is to go on a dyno

[BLU CIVIC]

Originally Posted by civickiller

too many factors to say that it would be taht for every single setup like that.

like i said stick to stock redline. only other real way is to go on a dyno

did you even click the link it takes into consideration your set-up and then gives your shift points

racing to reline isn't the smartest thing to do and you would loose to someone who shifts and stay in their powerband...which is what he is asking...anyone can race to redline but to stay ahead, keep your rpms from dropping so that you maximze your speed and power, you need to know your approximate shift points

[civickiller]

yeah i did click on it. so what rear end ratio is he going to put in there. he doesnt have a rear end ?

[BLU CIVIC]

itz a basis for him to go off of

Please bear in mind that these calculators are approximations only. Although the information is based on a 5.0 liter Mustang, it is general enough to apply to any car used for drag racing

[civickiller]

the calculations arent gonna be right because they are for a rwd car, not a fwd.

so you cant use that. like i said use stock or stick it on a dyno to see your power band and shift accordingly

[Kven]

well you cant always rely on theory vs. real life. i would just get it dynoed and shift where hp drops off. if you notice how some of the road racing drivers shift, they tend to shift a little higher than redline so when the revs drop, it still be in the power band.

btw, for rear-end ratio; use Final Drive ratio(pretty much same thing)

btw, which calculator are you guys looking at? there's one that asks a little about the engine, but also asks for a "shift point" so that wouldnt tell you when to shift. also, that calculator cant figure out the powerband of different motors(no calculators really can; too many variables(mainly cam/ignition timing though))

[BLU CIVIC]

Originally Posted by Kven

well you cant always rely on theory vs. real life. i would just get it dynoed and shift where hp drops off. if you notice how some of the road racing drivers shift, they tend to shift a little higher than redline so when the revs drop, it still be in the power band.

btw, for rear-end ratio; use Final Drive ratio(pretty much same thing)

btw, which calculator are you guys looking at? there's one that asks a little about the engine, but also asks for a "shift point" so that wouldnt tell you when to shift. also, that calculator cant figure out the powerband of different motors(no calculators really can; too many variables(mainly cam/ignition timing though))

on that site i think it said to shift 1.5 rpms above your ideal shift point

i was refering to that Evenly Spaced Transmission Gears for Off-the-line Gearing and Rear End Ratio calculatior...but it said it was an approximation...gotta start somewhere