Different versions of MJLJ

AL Mk1 · Post by **AL Mk1** » Fri Jun 17, 2005 9:59 am

Hi,

I am looking into adding MJLJ to my current project.
I have been in touch with Bill Shurvington here in the UK who can supply the system though he gave me some prices based on the "TPS" (I assume - Throttle Position Sensor) version.
How many different versions are there and what are the main differences?

I am currently building a VW KR code 16v engine, which I am hoping to run on Honda CBR carburettors. I don't actually think I can attach a TPS to these carbs?

Reading through this site, I was planning on just hooking up the Manifold Vacuum (MAP) part. Is this right, or do I still need a TPS?

I'm a little confused!?!?!?

Cheers,
AL.

AL Mk1 · Post by **AL Mk1** » Fri Jun 17, 2005 2:47 pm

OK, I think I have worked out that you can either hav an MAP (Manifold absolute Pressure?) sensor or a TPS - Is this right?

If so, which is the better setup?

Cheers,
AL

Visit My Homepage at: http://freespace.virgin.net/al.macklen

Ivan · Post by **Ivan** » Fri Jun 17, 2005 4:49 pm

Hello if you are using carbs then my opinion is tps
The sensor can be placed on these carbs, I made a bracket to
fit twin dollerto's myselfe.

Ivan

Post by **brentp** » Sat Jun 18, 2005 12:02 am

If you can get a reliable MAP reading, the MAP sensor is more accurate. It more accurately measures the engine load than measuring the throttle.

That said, I think you'll get satisfactory results from both.

The board is set up with a MAP sensor by default, but requires a mod to do TPS- it's a bit of a hack, but not too bad.

The next V3 board revision will have proper circuitry to support TPS and will be integrated into the main interface plug on the MJLJ.

AL Mk1 · Post by **AL Mk1** » Mon Jun 20, 2005 7:43 am

Cheers guys...

I am actually going to try using Motorbike carbs. I have had a look at them and see no way of attaching a TPS at the moment.
I think I am going to have to strip down one of the spindle mechs to see if can be modified or a replacement made.

I would prefer to go with the MAP sensor, though on carbs, I believe it is difficult to get a good vacuum without pulses on low RPM?

Cheers,
AL

Visit My Homepage at: http://freespace.virgin.net/al.macklen

Josh_b · Post by **Josh_b** » Mon Jun 20, 2005 9:36 am

hi, i would say go for the map, i was worried about pulsing at low rpm as i have a fairly long duration cam and 2 twin 45 dellorto's i have 1 vacuum take-off from each carb and it works great!

AL Mk1 · Post by **AL Mk1** » Mon Jun 20, 2005 2:09 pm

Cool - I thought that the MAP sensor would be the better option...
So would it be best to tap off one or two intake ports, or all four?

Cheers,
AL

Visit My Homepage at: http://freespace.virgin.net/al.macklen

Josh_b · Post by **Josh_b** » Mon Jun 20, 2005 6:22 pm

to get the smoothest signal tap 4, 1 or 2 would probably work fine though!