im just wondering if anyone knows if theres a rear diff out there that has a 1 to 1 gear ratio.

 

I'm guessing you mean a ring and pinon that gives you a 1:1 in fifth gear.Because a 1:1 ring and pinion would have the same amount of teeth on the ring and pinion gears.I can guarantee that wouldn't fit in a stock tranny case.
Glenn

 

Rear diff? S2000? What are you trying to do? You really don't want a 1:1 differential...

 

No not from an S2000. For the last 2 years Ive been spending about 15 hours/week designing a single seater car that should be quite a bit under 1000lbs(im going for 700) and i want to power it with a B series motor. For the sake of keeping drag coefficients low, keeping the motor parallel with the car is a must. I know it seems a bit ridiculous but a few CNC parts could make it work, with the acception of the gearing being drooped so far down. I think I may just result to an SR20 or something similar to it with a super short drive shaft (practically welding 2 u joints together, but not really). I know what your thinking, "this guy is a tard!" If you could see how much time I've invested in this and how close I am to being done with the designs, I'm sure you would have 2nd thoughts...

 

id like to see some pics

 

Finding a 1:1 rear end would be next to impossible. You would be better off building a custom transfer case to go out of the transmission and up the ratio to the driveshaft.

 

One reason for the rear end ratio, is so the driveshaft doesn't put as much torque on the differential case. Say with a 1:1 rear end instead of 3:1, the driveshaft & differential case have to handle 3 times the torque.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">One reason for the rear end ratio, is so the driveshaft doesn't put as much torque on the differential case. Say with a 1:1 rear end instead of 3:1, the driveshaft & differential case have to handle 3 times the torque.
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yeah i know thats what i was thinking, I was just trying to find an easy way out... I guess ill just need to go with a SR20 or something similar...

 

Or 6" tall tires!

My friend and I are in the beginning phase of a K20 powered mid-rear car, NOT biting off the Adam. Your target weight is about half of ours, but the one we make will have 2 seats and be "reasonable" on the street. I'd like to see more of yours, if you have anything availible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">Or 6" tall tires!

My friend and I are in the beginning phase of a K20 powered mid-rear car, NOT biting off the Adam. Your target weight is about half of ours, but the one we make will have 2 seats and be "reasonable" on the street. I'd like to see more of yours, if you have anything availible. </TD></TR></TABLE>

everything i got so far is on paper and on my lap top (which i don't have with me) i can draw a quick picture of the front suspension setup im using i think you will be pleased.

Basiclly it uses a push rod setup and a single coil over. when the push rods move up, the triangular block swings around transferring energy into the coil over (yeah i know its a crappy drawing, it was done with paint). when one push rod comes up the block slides sideways compressing one of the springs. the springs are what makes the anti sway possible... if that made no sense, let me know i can color the pic and go more into depth.

 

You could have Hewland build you a custom sequential, but thats money. Even Quaiffe could do it.

I know that the Ultima GTR uses a MR engine design, and a Porsche transmission (Like a G20 or somethign liek that?), its like the 'rear diff' is 'built-in' the transmission, so theres no driveshaft. I'm thinking the F22 S2000 engine, everything is longitudinal in this setup, I'm not sure if you could run a K/B series longitudinal because I think even on the Lotus Elise, its transverse.

 

i'm not sure what you want to acomplish in the long run, but, if you just want a taller final drive so it'll be harder to spin tires, then why not get the whole gears taller and leave the final drive as low as possible?