Hey all, I know all the threads (I think I read half of s2ki when the work day gets slow) and I've read all the facts and I know the ins and outs and how different gears are better for different tracks.

What I'm wondering is, on a track with a long straight when will a stock s2000 catch and pass a 4.77? I ask because I know the majority of the advantage is down low, however when you approach a long straight once you are already moving, that might not be the case anymore. Say you have two s2000's rolling at 30-50 mph and they both punch it (anotherwords from a roll) on a long straightway, at what speed will the 4.10 car catch the 4.77?

I know that eventually the stock car will have to catch up because the 4.77 car will top out up to 20mph less (AP1/AP2 dependant) than the stock car. What I'm wondering is, will the stock car have already caught up and passed the 4.77 geared car before it runs out of gear or will the advantage gained down low be to great?

100mph, 110, etc? All things being equal (except of course the FD ratio).

Thanks in advance for any input . I know there are some formula's out there that would tell me, but I'm curious as to some real word scenarios.

 

The 4.10's will start to pull back on the 4.77 once the .77 is pretty much out of gear and at top speed, while the 4.10 is still climbing..

 

/thread

http://www.turnzero.com/technical_resource...gear_calculator

 

My concern would be...can the 4.10 actually reach it's estimated top speed of 165mph? Of course the 4.77 will hit top speed at 145mph but the wind drag may be too great for the 4.10 to actually match the top speed.
All that being said, I believe most people have come to the conclusion that gears don't really help with quarter mile times even. They just offer seat of the pants acceleration and better 0-60 times. However, this time difference may be contributed to 4th gear maxing out at 100mph with the 4.77's and if your trap speed is higher than that, you'll have to do an extra shift.

 

never haha 4.77 ftw . no i dont know but would like to find out cars would have to have similar power adding mods .

 

haha i second that.. maybe once the 4.77 car reaches 145 mph and it cant go any faster..

 

I'm not sure you understand my question. Obviouly I can look at the gear calculator and see when the 4.77's will top out in 6th gear. Thats not my question , thanks though.

What I am asking is, since it has been said many times that the 4.77's (or other gear upgrades) will lose their advantage as the speed climbs, is there a speed where the stock 4.10's will actually surpass the 4.77'd car BEFORE the 4.77 maxes out.

Anotherwords, say they both come out of a curve on a track with a long straight away and they come out dead even (say the 4.10 guy was a better driver) and they are both going 50 mph side by sde when they hit the straight and they both nail the throttle . . . I know the 4.77 car will get the jump, however if there is room on the straight to hit the top speed the 4.77 gear allows, will the 4.10 car ever catch up until the 4.77 runs out of gear? Make more sense?

 

No, your question really doesn't make any sense. You are presupposing the answer, and it's not necessarily the right answer.

 

Sorry for the confusion. I really don't mean it that way. I mean more along the lines of, WILL a stock 4.10 car catch a geared (say 4.77) car before it runs out of gear?

 

I think you guys are wrong on this. What you forget to factor in is the time it takes to shift, and what RPM you'll be at coming out of corners, or at the end of the straight. A really quick shift is about .55 secs. A slow shift is about .75 sec. Also, if the 4:11 can come out of the corner in second at 6000 rpm he will have a really good 2-3k rpm before his first shift. If it's a set of 4.77's, he'll be at 7000 RPM. This means only 1-2 thousand rpm before a shift. Also , if the straight is just long enough for the 4:11 to stay in 4th, the 4:77 will need to shift to 5th. Yes, gear to gear the 4:77 will be faster, but you've got to take it into context of the track. For all the tracks I run, the 4:11 seem to be quicker than my 4:57. I know some have suggested the 4:11 is as much as 2 seconds faster at Laguna, than the 4:56. I'm not sure I believe it's that much, but I think it is significant.

Bill