inaccurate sppedo

[spivvy]

whilst out yesterday on a meet i thought i would check my speedo accuracy against other people and it appears to be reading approx 10mph faster thet i am actually doing ,

is this a TVR feature? or is there something i should be looking at at if so what

[shnozz]

mine is very accurate when checked with my GPS road angel. Over 100 (on private roads) it is about 1 - 2 mph but below its pretty much spot on.

[spivvy]

i have standard size tyres fitted
i can't figure out why it is so inaccurate ?

[roy_allen]

I think my speedo may be out by about 5 mph. Following the wife yesterday on the motorway she was doing 70 so she says and i was doing about 75 and i wasn't gaining on her. Could be her speedo i suppose but I`m more inclined to think that it is mine.

Roy.

[crossle]

I just picked up my first TVR - an S1 on Friday evening. Driving home on the M4 it was indicating 100+ mph but did not feel anything like it... I even had a Peugot diesel van up my backside! However, following other traffic past speed cams at 40 and 30 mph the speedo seemed kosher. Perhaps it just at higher speeds that the gauge gets over excited?