Hello
I have a 92 hatch powered by a 2.3L (F23A1) motor and trans from a 99 accord.. My problem is that my speedometer is off. It reads about 7-10 mph faster then I am going… any one out their have any ideas on how to fix it… I was told to try the civic speed sensor or something called an Electronic Ratio Adapter

 

I think ti's because of your tire size actually.

What kind of tires do you have on it?

Typical '92-'95 Civics use 185/65R-14 while circum '01 (where the F23A1 is from) accords use I BELIEVE a 195/65R-15. That's over an inch and a half in diameter difference which sounds just about right to throw your speedometer off that much. You have to remember that the F23A1's VSS is configured for the cirucm '00/'01 accord EX tire size.

So what tire size is on your civic.

 

i have the same prob with my 99 coupe with an itr swap except its 5mph less than it reads....16" rims..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01_CLtypeS &raquo;</TD></TR><TR><TD CLASS="quote">i have the same prob with my 99 coupe with an itr swap except its 5mph less than it reads....16" rims..</TD></TR></TABLE>

Well the rim size isn't as important as the actual tire size. 17" rims can have the same total diameter as 15" rims depending on the sidewall aspect ratio and the width.

I can tell you for a fact though that 1.5" or 2" or so total diameter difference will kick you a good 6 or 8mph or so at ~60mph. So it wouldn't be far fetched if he's throwing a 10mph off reading at 70-75mph.

 

yeah i am running 185 60 14.. i did have it tested
@10 mph i read 12 mph
@20 mph i read 28 mph
@30 mph i read 38 mph
@40 mph i read 50 mph
@50 mph i read 61 mph
@55 mph i read 67 mph
@60 mph i read 72 mph
@70 mph i read 84 mph
@80 mph i read 94 mph

do you thing a 92 - 95 civic speed sensor will fix anything

 

also i would like to get 17 someday what setup do you think will work and keep the speed reading the right speed

 

You aren't going to be able to fix that big of a difference with wheels and tires. They won't fit and they will look bad. Even with factory tires these cars do not have accurate speedometers. I have both a 94 EJ1 & a 99 EJ8. 1st I tried 205-50-15's. Still read at least 3-4 mph fast at 70. Now I'm running 195-55-15's. It still reads fast but at least it's closer. Now it's only 2-3 mph off.

 

**** i could live with it being off 2-3.. but all over the place like mine is.. maybe i will get 15 or 16 i really dont know yet + i have no money to buy wheels..

 

anymore ideas

 

Yeah, the stock tiresize is roasting you - you need to get different tires.

185/60R-14 on an F23 will throw it off exactly like you're experiencing.

195/70R-14 should = about the same as 195/65R-15's (only .14" off total diameter).

About .5mph @ 60 - too low of a difference to know if it would work.

You put those tires on your rims and you should be fine.

You can live knowing it's ~7mph fast @ 60mph, or getting a 15" rim would allow you to use the stock accord tire size, or you can get tires with a higher aspect ratio (70's) to make 'em about the same total diameter as the accord's. That part is up to you. Hope this helped some.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2.3lcivic &raquo;</TD></TR><TR><TD CLASS="quote">yeah i am running 185 60 14.. i did have it tested
@10 mph i read 12 mph
@20 mph i read 28 mph
@30 mph i read 38 mph
@40 mph i read 50 mph
@50 mph i read 61 mph
@55 mph i read 67 mph
@60 mph i read 72 mph
@70 mph i read 84 mph
@80 mph i read 94 mph

do you thing a 92 - 95 civic speed sensor will fix anything</TD></TR></TABLE>

It should, but I didn't know you could use a D series VSS in a F series transmission.

 

hey Syndacate thanks for your help...

i wanted to go with a smaller sidewall tire like 50 or 55 what would be your thought on this

 

this might help it shows you what tire size is correct and how much your speedo will be off wiht a new size...
http://www.miata.net/garage/tirecalc.html