megajolt and bike carbs?

[onedayTM]

I have 1.8 zetec with bikes which does not have TPS, what do I need to get it going. Is it just trigger wheel and flywheel sensor, or do i need TPS and just cranks sensor. My megajolt does not have vacuum point.
any help welcome.
cheers tony

[davedew]

You can get the engine to run using crankshaft position sensor and EDIS 4 on its own.
You will need EDIS as Megajolt cannot drive the coilpack directly.
If you want a full 3d ignition setup you will have to add a TPS to the carbs.
Triggerwheels sell TPS sensors.

HTH

[onedayTM]

ok cheers david

[Tatey]

I'm running a 1.8 silvertop zetec with ZX6R carbs (no tps) and megajolt. As Dave says you just need a coil pack, use the crank position sensor and EDIS 4 unit. I am using a MAP sensor with my engine due to the lack of TPS on my carbs. I have just drilled and tapped my inlet manifold with an M3 tap and then fitted some welding tips drilled out to 2mm which are also loctited in place to make them air tight to the manifold. I've then teed the 4 vacuum feeds together and then they go into one of the plastic fuel filter housings which acts as a damping unit to smooth out the vacuum signal. This is then attached to Megajolt.

Using a MAP sensor has a few advantages over TPS in that it more accurately shows how the engine is breathing as TPS doesn't show load, only throttle opening. However MAP can be more of a faff to get a smooth signal from.

[onedayTM]

Yes i was hoping to do that but there is no connection on the back of my megajolt, it's one I bought of someone who was selling up and I see on the box it is from 2008. Looks like I will be fitting TPS.
cheers tony

[wylliezx9r]

You'll also find that you get better throttle response using TPS rather than MAP. MAP is only really neccesary for charged cars and emmission control.

[baz-r]

Originally Posted by wylliezx9r

You'll also find that you get better throttle response using TPS rather than MAP. MAP is only really neccesary for charged cars and emmission control.

i dont realy agree as its really more of an engine dependent factor rather than rule of thumb

both tps (alpha-numeric) and map (%baro) have there limitations for mesureing engine load

tps is poor at mesuring load as its has no way of knowing what load is on the engine (eg cruse and overun) and poor scaling for small tps movements away from idle so its useless for road driving

map works well unless you either have poor vacum at idle eg 65kpa or higher (wild cams with lots of valve overlap in 8v engines) and is not too acurate past 90% atmosperic pressure

for ignition only setups like megajolt you only need to work out engine load for added part load ign advance! so all we need to know is how full a cyl is and inlet pressure is the best way to do this and easy to set up as past 80-100% baro you need no extra advance.

people rattle on about tps to be used for bike carbs but its rubbish and most carbs off bikes are cv type so tps is not a true mesurment as carb slides control actual inlet aperture size! for what ists worth you may as well be 2d and have fixed advance for revs.

its not like we have to calcualte anything for fueling unless we have a turbo then we would have to take out advance under boost

[snapper]

The above reply is good
If you have carbs without TPS and Megajolt without MAP your options are .. buy a set of carbs with TPS or rig a bracket to take TPS if you have enough throttle shaft to work with.
You can't bodge a TPS jolt to run without an input, you could rig the TPS to throttle cable or pedal, bit of a faff.
Earlier a reply said you can run the car without Megajolt just using EDIS, you can but will have a fix 10 degrees throughout the Rev range

[norton]

If you run them from one air box and a cone filter you could use a large dia' hotwire sensor?