bongo speed pulse

anthony · Post by **anthony** » Wed Mar 14, 2007 8:40 pm

hi every one please could anyone help me i am currently in the process of fitting a in dash sat nav unit and cant find the speed pulse has anyone ever installed one or can you tell me the wire location and colour thanks

Yamaha · Post by **Yamaha** » Wed Mar 14, 2007 9:45 pm

Hi - apparently, it's a blue/white wire that is used to also supply the conversion chip for the speedo - if yours has this fitted.

Mike

dreamwarrioruk · Post by **dreamwarrioruk** » Wed Mar 14, 2007 11:36 pm

remove the instrument cowel, 2 screws or 3. remove the whole instrument panel (speedo ec) to gain access to the multiplug connectors. you want to be on the middle plug and you should find the offending wire there.

grumpo · Post by **grumpo** » Thu Mar 15, 2007 9:42 am

The speed pulse is a very high impedance source and some sat-navs have
been known to drag this down sufficiently to degrade the signal to the
speedo and stop it working, this is more prevelent if you have a converter
chip fitted.

Unless you spend most of your time travelling through long tunnels, it's
best left unconnected, you won't miss it.

anthony · Post by **anthony** » Thu Mar 15, 2007 8:41 pm

thanks guys for the very fast reply i will try these solutions at the weekend and post my results thanks again everyone

dobby · Post by **dobby** » Fri Mar 16, 2007 1:24 am

A quick sat nav question, my tom tom one always shows my speed as about 5mph less than the bongo's speedo - i.e 64mph when the speedo's showing 70mph - is the tom tom more accurate? The speedo was moddded by AVA at purchase.

pippin · Post by **pippin** » Fri Mar 16, 2007 9:07 am

Lots of previous posts on this subject, but yes, the Bongo speedo is notoriously innaccurate, especially unchipped with the dial conversion.

I would believe the Tom Tom.

dobby · Post by **dobby** » Fri Mar 16, 2007 9:16 am

Cheers Pippin - nice to see you're back. Hope you had a good time. PS where did you get the Vengeance?

pippin · Post by **pippin** » Fri Mar 16, 2007 9:41 am

Not easy, but here's how to do it:

You need to insert them funny coding things manually
color=red
&
/color
around each letter. I cannot display them with square brackets fore & aft, but if you add them it works.

Clear as mud I suspect!

phedders · Post by **phedders** » Fri Mar 16, 2007 2:35 pm

Just about every car I've tested (with various GPS's) show 10% more speed then you're actually doing. I guess the manufacturers go for the cautious approach to not getting their customers in the slammer.

One exception was an Audi S2 - it did exactly what it said it was doing. Another was a Ferrari. I suspect the performance cars are more likely to give accurate reporting - to make you think you're going faster than you are in your escort/othercar...

On my bongo and the old one - 77 on the dial was 70 on the road.

alphabetter · Post by **alphabetter** » Fri Mar 16, 2007 4:18 pm

Remember the MOT requirement is that the speedo reads up to 10% over actual speed, but is not allowed to read under the actual speed. Therefore the designer will almost certainly set the speedo to read a nominal 5% over with a 5% tolerance.

I would agree that performance cars are more likely to be set closer to actual.

dandywarhol · Post by **dandywarhol** » Fri Mar 16, 2007 6:55 pm

Speedo isn't an MOT requirement - only a constructions and use requirement.............

grumpo · Post by **grumpo** » Fri Mar 16, 2007 7:04 pm

With modern production techniques it's not that difficult to produce a
speedometer which is practically accurate to 100%. I don't think that
vehicle manufacturers would except an instrument which could be up
to 10 mph fast at 100 mph.

You might notice that most who complain have a constant discrepancy
over the whole range between 5 and 8 mph, and as pippin suggested
these are mostly found on vehicles which have had the speedo face
plate changed.

This is usually caused when the face plate is changed and the needle
has not been set against the lower stop correctly. If you simply replace
the needle against the stop without any tension, it will always read fast
by a constant value.

alphabetter · Post by **alphabetter** » Fri Mar 16, 2007 8:43 pm

dandywarhol wrote:Speedo isn't an MOT requirement - only a constructions and use requirement.............

Quite right - you learn a new thing every day!

grumpo wrote:it's not that difficult to produce a
speedometer which is practically accurate to 100%. I don't think that
vehicle manufacturers would except an instrument which could be up
to 10 mph fast at 100 mph.

Probably true, but as an engineer I would always design to the mid-point of any tolerances specified unless someone told me to do otherwise!

dandywarhol · Post by **dandywarhol** » Fri Mar 16, 2007 10:09 pm

grumpo wrote:With modern production techniques it's not that difficult to produce a
speedometer which is practically accurate to 100%. I don't think that
vehicle manufacturers would except an instrument which could be up
to 10 mph fast at 100 mph.

You might notice that most who complain have a constant discrepancy
over the whole range between 5 and 8 mph, and as pippin suggested
these are mostly found on vehicles which have had the speedo face
plate changed.

This is usually caused when the face plate is changed and the needle
has not been set against the lower stop correctly. If you simply replace
the needle against the stop without any tension, it will always read fast
by a constant value.

and switch on the "ignition" key first.

anyone noticed how fast these Bongos go in reverse???35 mph on mine so far