Tires
Tires
#1 what are thoughts of running a larger tire? Currently with stock size 195/65/14. Was considering some 205 or 215s to give myself an extra inch or 2 in diameter.
#2 if I do such, how does one adjust the speedo? IM used to swapping speedo gears on the transmission.
1987 Mazda B2200 "outlaw" **planning phase** Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans
1985 Mercedes 300D stock for now
OK so I've had some time to put my new car on the highway. Boy do I understand the desire for another gear on these 722.3 ATXs! S, in lieu of finding a 722.5 or 722.6 for my 30 year old sedan, I was wondering 2 things.
#1 what are thoughts of running a larger tire? Currently with stock size 195/65/14. Was considering some 205 or 215s to give myself an extra inch or 2 in diameter.
#2 if I do such, how does one adjust the speedo? IM used to swapping speedo gears on the transmission.
1987 Mazda B2200 "outlaw" **planning phase** Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans
1985 Mercedes 300D stock for now
If you switch from your current setup to 205/65 14 the tires rollingcircuit(?) not sure of the proper word, will be 2,13% higher, 215/65 14 will be 4,27% higher.
Atleast in Sweden you are allowed to change this up to 5% from original size tires.
Dunno about the U.S however
No need to adjust your speedometer??
If you switch from your current setup to 205/65 14 the tires rollingcircuit(?) not sure of the proper word, will be 2,13% higher, 215/65 14 will be 4,27% higher.
Atleast in Sweden you are allowed to change this up to 5% from original size tires.
Dunno about the U.S however
1987 Mazda B2200 "outlaw" **planning phase** Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans
1985 Mercedes 300D stock for now
I'd like to have a correct speedometer, as future interstate travel is planned. No laws in my area about changing tire size
1987 Mazda B2200 "outlaw" **planning phase** Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans
1985 Mercedes 300D stock for now
(08-25-2015, 11:03 AM)EmJay I'd like to have a correct speedometer, as future interstate travel is planned. No laws in my area about changing tire size
Hehe
Well then I can't help you. I once had my speedo recalibrated, but sent it away to be done by a professional. Maybe someone else knows how to diy?
(08-25-2015, 11:03 AM)EmJay I'd like to have a correct speedometer, as future interstate travel is planned. No laws in my area about changing tire size
Hehe
Well then I can't help you. I once had my speedo recalibrated, but sent it away to be done by a professional. Maybe someone else knows how to diy?
Ninth Year Anniversary with STD on 1-9-2020
visit: www.dieselfuelinjector.guru
Project 2018: Really get the car finished -- Turbo OM617 greater than 175 MPH goal.
RED W123 - left Germany as 240D in 1982. Full AMG body kit less rear apron, 2:65LSD, five speed Getrag 717.400, manual steering, read leather interior, manual brake conversion, electric water pump (EWP), and a bunch of other goodies ...
Yup ... Mine is way way off too with the 2:65 LSD differential and I just added 15" tires. I am going to re-calibrate my face plate on the speedo once I get the engine installed. No way to get a precise speedo cluster if you start changing tires, changing differential gearing, et cet. The customer made plates are cheap and look factory.
Ninth Year Anniversary with STD on 1-9-2020
visit: www.dieselfuelinjector.guru
Project 2018: Really get the car finished -- Turbo OM617 greater than 175 MPH goal.
RED W123 - left Germany as 240D in 1982. Full AMG body kit less rear apron, 2:65LSD, five speed Getrag 717.400, manual steering, read leather interior, manual brake conversion, electric water pump (EWP), and a bunch of other goodies ...
1987 Mazda B2200 "outlaw" **planning phase** Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans
1985 Mercedes 300D stock for now
Hmm, so not as simple as swapping speedo gears. Rats. Ah well, my truck still has an inaccurate speedo so what's one more 300K vehicle with a slow speedo?
1987 Mazda B2200 "outlaw" **planning phase** Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans
1985 Mercedes 300D stock for now
As far as adjusting, I think you can adjust the distance from the cup to the magnet.
raysorenson
08-26-2015, 07:21 AM #8In my experience, the old speedos are very optimistic. Have you checked it against GPS? There's likely room increase tire diameter and improve speedo accuracy.
As far as adjusting, I think you can adjust the distance from the cup to the magnet.
raysorenson
08-26-2015, 01:34 PM #10You're saying an indicated 75mph when you're really doing 72 is reading "slow"?
I think the extra weight of the tire kind of negates the effects of fuel economy. But then again I went to a heavier rim as well
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted
I'm running 215/55r16 if I remember correctly. Slightly larger than stock, and it actually did help drop my rpm a shade.
I think the extra weight of the tire kind of negates the effects of fuel economy. But then again I went to a heavier rim as well
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted
you are talking about your 1985 300d w123 right? how about fitting a 3.07 from a 300tdt aswell as the speedometer, works good on two 72hp 240d manuals i have. (one with a 2.88 and one with a 3.07) so should work without a problem on your automatic 300d 88hp car
that way you will get deacent rpm, and cruising at 60mph is acctualy a pleasure.
---------------------------------
daily driver
w115 240d 72hp 3.07 rearend
w123 om602 turbo 200whp 7.5mm pump fivespeed 3.07 rearend
+ a few more.
mbturbo.com
swampmonkey
08-27-2015, 10:43 AM #13larger tires makes a difference, but not much, i run 195/70r15 in the back of my w123, and had the same on my 240d w115 with a 3.07 differential.
you are talking about your 1985 300d w123 right? how about fitting a 3.07 from a 300tdt aswell as the speedometer, works good on two 72hp 240d manuals i have. (one with a 2.88 and one with a 3.07) so should work without a problem on your automatic 300d 88hp car
that way you will get deacent rpm, and cruising at 60mph is acctualy a pleasure.
---------------------------------
daily driver
w115 240d 72hp 3.07 rearend
w123 om602 turbo 200whp 7.5mm pump fivespeed 3.07 rearend
+ a few more.
mbturbo.com
Ninth Year Anniversary with STD on 1-9-2020
visit: www.dieselfuelinjector.guru
Project 2018: Really get the car finished -- Turbo OM617 greater than 175 MPH goal.
RED W123 - left Germany as 240D in 1982. Full AMG body kit less rear apron, 2:65LSD, five speed Getrag 717.400, manual steering, read leather interior, manual brake conversion, electric water pump (EWP), and a bunch of other goodies ...
yes, if your car is a 1985, it's most likely has the 2:88 which is desirable IMO. I think 85 is the only year for the 2:88, except some late production models in 1984. You can check the flange for the stamping. It will hide on you when you look, but once you see the flange, and clean off any crude, it's right there. 3 miles off is not too horrible. mine is off by a bunch ..lol
Ninth Year Anniversary with STD on 1-9-2020
visit: www.dieselfuelinjector.guru
Project 2018: Really get the car finished -- Turbo OM617 greater than 175 MPH goal.
RED W123 - left Germany as 240D in 1982. Full AMG body kit less rear apron, 2:65LSD, five speed Getrag 717.400, manual steering, read leather interior, manual brake conversion, electric water pump (EWP), and a bunch of other goodies ...
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