apexi rsm kilometre reading problem

**alphabeatsco** · 23-10-2004 02:36 PM

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** · 23-10-2004 05:48 PM

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|** · 23-10-2004 07:40 PM

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

**alphabeatsco** · 24-10-2004 12:37 AM

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** · 24-10-2004 03:37 AM

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** · 24-10-2004 09:36 AM

Originally Posted by 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

Yeah what size rims and what profile rubber do you have?

**A'PEXi** · 24-10-2004 10:16 AM

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** · 24-10-2004 10:38 AM

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** · 24-10-2004 10:39 AM

Originally Posted by 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...

So do you ahve different sized rims/tyres to stock?

**alphabeatsco** · 24-10-2004 11:14 AM

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

**wynode** · 24-10-2004 01:52 PM

Originally Posted by alphabeatsco

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

That's probably why the reading is off :

**alphabeatsco** · 24-10-2004 03:18 PM

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..