16v / Williams Box speeds

[Martin]

My williams has a reciept for a re-con gearbox from a couple of years ago and I didnt think much about it until I tested my car on a private runway recently. At 140 mph my car is revving at around 6700/6800 rpm is this right for a willy box? If the williams top speed is 134 surely it shouldnt hit the normal limiter (I have chip) at around 135 on the clock.

 

[Roamer]

What type of box was the receipt for?

If it said JC5 014/015 or S09 then its a willy box, if it stated a JB3 then its a valver box.

And yes, I can confirm that they will do a genuine 140 (GPSd) but I dunno at what revs lol - Im normally not concentrating on the clocks at that point.

 

[Mark@Ritchspeed]

My old Willy 3 pulled a genuine (using gps) 142mph bouncing off the limiter in 5th . Revcounter reading @7500rpm and the speedo was just a dash under 150mph . Standard , apart from Hillpower stage1 mods and decat.

 

[Martin]

Impressive! 7.5k wouldnt want to do that for too long.