i do a lot of travelling in my 2000 si and one of the things that bugs me is how high the rpms are for 5th gear when i'm cruising around 80mph. I was talking to my friend about this and he said that if i put the 5th gear from a integra ls tranny into my b16 tranny that it would drop the rpms significantly. Currently at 80 mph my rpm is around 4500. Does anyone know if this is a good idea? Also, can someone tell me what rpm the ls tranny is at 80 mph...

thanks

 

Just put the whole tranny out of an ls in. It's much easier and probably just as cost efficient.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bense &raquo;</TD></TR><TR><TD CLASS="quote">Also, can someone tell me what rpm the ls tranny is at 80 mph...</TD></TR></TABLE>

gear calculator: http://www.f-body.org/gears
i don't know the ratios of the top of my head, but i'm sure you can search for those.

i would definately do this instead of just swapping a ls tranny in. but, rebuilding the shafts is a pain in the ***, and if you don't take your time you're bound to mess something up. make sure you know what you're getting into before you attempt this.

 

at 80mph my ls is at 4500 rpms

 

Hate to dig this thread up back from the dead, but after many nights of lying in bed thinking about **** like i always am, i figured it out. So for you people out there that are thinking that the b16 tranny is incredibly short and worried about how high the RPMs are when you're cruising on the highway, here's a piece of mind

Okay so on the b16 tranny 80mph in 5th gear is about 4350 RPMs.
The stroke on the b16 motor is 77mm. So that means that each revolution the piston goes down 77mm and then returns 77mm. So each RPM the pistons move 154mm (77 x 2) So lets multipy the piston movement by the RPMs at 80mph
154 x 4350 = 669900
so that means at 80mph on a b16 motor with a b16 tranny each piston moves 669900 mm per minute.

So now lets do the GSR
80mph in 5th gear = 4050 RPMs
GSR stroke is 87.20 mm
87.20 x 2 = 174.4 RPMs
174.4 x 4050 = 706320
So that means at 80mph a GSR motor with GSR tranny each piston moves 706320 mm per minute

94-01 LS
80mph in 5th = 3550 RPMs
631900mm per minute

b16 = 669900
gsr = 706320
ls = 631900

So technically, the motor with the most piston movement at 80mph is the GSR. Followed by the b16, and then the LS. I know that this is rather in depth, but this is the explanation that i was looking for when I posted this question exactly 8months ago. In conclusion I must say that if you're worried about something that Honda did, remember, their engineers are way smarter than you.

*all calulations were done with 205/50/15 tires

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG*MonKEY &raquo;</TD></TR><TR><TD CLASS="quote">at 80mph my ls is at 4500 rpms</TD></TR></TABLE>

Hmmm I'm at 4500 rpm on my B16 tranny.

 

i've had b16 and LS trannies on my LS..

at 80mph with b16 im at about 4500 rpm
at 80mph with LS im about 3900 rpm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">i've had b16 and LS trannies on my LS..

at 80mph with b16 im at about 4500 rpm
at 80mph with LS im about 3900 rpm</TD></TR></TABLE>

your rpms have to do with the tranny, not the motor. All b16 trannys are going to be around 4500 rpms in 5th gear. Except that old b16 tranny, i don't know about that