speedometer pinion
speedometer pinion
just recently dumped the old 14 in wheels and went with pathy 15's on the old d21. tires are 235/75/15 on a 4 cyl 2wd king cab 5 speed. anybody know where i can source a new speedometer pinion to correct the speedometer reading with the bigger tires? pulled the stock pinion and it is a 17 tooth. speedo is currently reading about 10% -12% slower than actual speed. any ideas? and am i correct in thinking i need fewer teeth on the new pinion?
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Rev_D21
- Posts: 5946
- Joined: Sun Jan 12, 2003 9:49 pm
- Car: 1986.5 D21 LB HD 2WD V6 5Speed
1991 D21 Reg 2WD Auto
1995 D21 Reg 2WD 5Spd
1996 D21 Reg 4WD 5Spd
2012 Versa 1.6S 5-Speed - Location: Somwhere in Western NY
- Contact:
Re: speedometer pinion
Those are some big tires for a 2wd. I wonder if a 4wd speed sensor might help out here. Anyone?
Re: speedometer pinion
does the 4wd bolt up in the trans the same way as the 2wd? or does it go into the transfer case? i have never seen underneath a 4wd d21.
as to the tire size, it's not for everyone. little more clutch slip is required when pulling the trailer or when starting from a stop on a steep grade. surprisingly though, 1st gear seems to be more useable. i can actually pull through an entire intersection now before a shift is required. before the tires i would have to upshift before making it all the way through most intersections.
on the highway, cruising rpms are much lower. haven't got the gps in there yet to know exactly how fast i am going but at what "feels" like 55 mph, rpms are in the 1500 range. according to http://www.miata.net/garage/tirecalc.html my odometer is reading 13.2% too slow based on an original tire size of 195/75/14. i need to get a full tank of gas through it so i can calculate the mileage based on that percent error.
all that being said i like the larger size much better. i can live with the inaccurate speedo/odo but if i can correct it that would be awesome. i have a 15 tooth speedo pinion gear ordered from japan. it is out of a navara. when it gets here in a couple of weeks hopefully it fits and works with little to no modification. if not it only cost me $25
as to the tire size, it's not for everyone. little more clutch slip is required when pulling the trailer or when starting from a stop on a steep grade. surprisingly though, 1st gear seems to be more useable. i can actually pull through an entire intersection now before a shift is required. before the tires i would have to upshift before making it all the way through most intersections.
on the highway, cruising rpms are much lower. haven't got the gps in there yet to know exactly how fast i am going but at what "feels" like 55 mph, rpms are in the 1500 range. according to http://www.miata.net/garage/tirecalc.html my odometer is reading 13.2% too slow based on an original tire size of 195/75/14. i need to get a full tank of gas through it so i can calculate the mileage based on that percent error.
all that being said i like the larger size much better. i can live with the inaccurate speedo/odo but if i can correct it that would be awesome. i have a 15 tooth speedo pinion gear ordered from japan. it is out of a navara. when it gets here in a couple of weeks hopefully it fits and works with little to no modification. if not it only cost me $25