apexi rsm kilometre reading problem

[alphabeatsco]

hi i have an EK4, and i installed a RSM on the car..
the kilometres reading on my rsm is different compared to my car's tacho..
both have been reset to 0 everytime i fill up petrol and it's da same...
it's about 20 km difference.
anyone can help?

[_Daniel]

do you reverse alot?
when u reverse the RSM will count up whereas the dash will go backwards
20km is alot, most of the time mines like .5 Km out at most

[|N|]

reverse for like 20km? i reckon even 5km of reverse is still too much .. way too much

[alphabeatsco]

no mate, i dun reverse a lot
haha
i just drive normally
and it's always around that much...not just like once
i tested it for like 8 times already

help me..i dunno why
would it be the settings on my rsm?

[alan]

rolling diameter of aftermarket wheels will affect the rsm reading and also the stock speedo is not 100% accurate to start with. it will show a little under the actual speed your travelling.
rsm can be setup to take wheels sizes etc into consideration, read the manual or go to apexi website to find it

[wynode]

rolling diameter of aftermarket wheels will affect the rsm reading and also the stock speedo is not 100% accurate to start with. it will show a little under the actual speed your travelling.
rsm can be setup to take wheels sizes etc into consideration, read the manual or go to apexi website to find it
Yeah what size rims and what profile rubber do you have?

[A'PEXi]

yeh, it doesnt matter if the rsm is slightly off, mine was (this was the speedo reading... ) the rsm was more accurate i believe :) i had 17's...

[alphabeatsco]

ok so the rsm is more accurate...
thanks for the help...
i appreciate it..
cos i had the rsm on my previous car..it was perfect match to my speedo....
that's why it seemed strange to me...

[wynode]

ok so the rsm is more accurate...
thanks for the help...
i appreciate it..
cos i had the rsm on my previous car..it was perfect match to my speedo....
that's why it seemed strange to me...
So do you ahve different sized rims/tyres to stock?

[alphabeatsco]

yes i do have different sized rims and tyres...

[wynode]

yes i do have different sized rims and tyres...
That's probably why the reading is off :

[alphabeatsco]

then can someone pls tell me what's the ek4 factory tire size and diameter...and also what is it's car weight.
so i can setup my RSM properly...
much appreciated..

[wynode]

Check the civic sticky for car weight (I think the EK4 is in there)

As for the tyre size, you will have to ask someone on here what the stock EK4 rim size and tyre profile is and then work out the rolling diameter.

OR you can do a search and find the online tyre calculator and find out how much your speedo is off by :)

[alphabeatsco]

hmm..to use the tyre calculator..i would still need to find out the stock ek4 tyre size right?
can anyone help me out? what the stock tyre size is? :D

[dundas]

hey my rsm is like that too-
i just dont use that view so it doesnt piss me off :D
however, i found when i drove sensibly-- changing safely so 1st gear wasnt at 50km/h hehehe-= the RSM was like REALLY accurate-
it only begun going weird when i drove it hard and did 1/4 mile runs and 0-100 runs-

try drive without redlining or hard drives :) just give a sunday drive and see for yourself-