I have fitted a 97 uk box to my 95 wrx,the speedo is now way out at high speeds, does any one know how to fix this or had this trouble on there car,i did a speed comparison using Gps,thanks matt................

 

Have you still got the Import converter in the cable?

 

Yes I think so,when i put the new box in there was an electrical conection, my old one was just a cable.

 

If you put the UK gearbox in, did you also fit a UK rear diff?

[Edited by greasemonkey - 9/17/2003 10:44:59 PM]

 

now IM confused! If i remember rite, a uk 97 is a mechanical speedo, yes?
You say that the "new" box has an electrical connection where as the old box has the cable?
Anyway, if your speedo cable has the mechanical converter box still inline, in the cable, remove it and see what it reads after.

 

Goodt thinking GM, the diff will not match.

 

Matt,
Is it a constant 15 mph out through the range or only above a certain speed?
I have the same problem on an import when checking speed with a GPS.
I then did some calculations of gear ratios, wheel circumference and revs. Comparing expected against actual showed that the GPS was underreading, mainly above 80 mph, by about 5%.

As an example, when the speedo was showing 138 mph, the GPS showed 112 mph but the "theory figure" was 127 mph.

Nick

[Edited by Butty - 9/18/2003 10:00:01 AM]

 

Need to be a bit careful with that theory Nick. Needle tachos can often be out by a considerable margin (unless you're talking about a Stack or other professional grade one), so you can't place too much reliance on measuring revs and multiplying by mph per krpm.

If you're getting the reading off a SECS/DeltaDash etc. of course, that's a different matter!

 

Thanks leviathan i will try that and dont worry i did change the rear dif,Nick at 40mph the GPS was reading 35 so it getts progresivly worst the faster you go up to about 15 mph at 100 or more,how far out is yours at low speed ?