12-11-13, 08:33 AM
You are not bonkers.
I recommend that:
You first put all the carb settings back to standard.
For my experience with stainless steel downpipes see below:
If you change your exhaust headers make sure the restrictor point of the new set is similar in overall opening size to the original set.
The original outlet measured: 35mm (narrowest point) to 43.5mm (widest point) externally at its most restricted point.
I’m not sure what the wall thickness is but I reckon it must be somewhere between 1.0mm and 2.00mm, my original pipes are still in good condition and I was loathe to saw them up to find out.
In any event the Motad replacement header system outlet pipe is has a clear open area of 1364sqm. Whereas the original outlet is restricted to somewhere between 962sqm and 1075sqm.
When I fitted the Motad headers the power band almost evaporated and a gas analyser showed it be running far too weak, this being supported by the plug colour, which was whiter than the bird that new seven dwarfs.
A further test was done by a lazer temp gauge on the exhaust clamp bracket of both original and new pipes and this showed the exhaust gas temp had risen.
To solve the issue the Motad pipe was sleeved down first to 1075sqm which improved things no end, and finally down to 975sqm, which seemed to be better.
Plugs were checked and exhaust gas analysed and the results were as good as I could get them.
My guess is you need to sleeve the outlet down to below 1000sqm. I used a bit of old heating pipe.
I have some spare pipe left over from when I did mine, so if you live near Bolton, you can borrow it and see if it works.
Or I can fit it for you (it's already pre-drilled to enable removal) and you can test by going up a hill near where I live.
I recommend that:
You first put all the carb settings back to standard.
For my experience with stainless steel downpipes see below:
If you change your exhaust headers make sure the restrictor point of the new set is similar in overall opening size to the original set.
The original outlet measured: 35mm (narrowest point) to 43.5mm (widest point) externally at its most restricted point.
I’m not sure what the wall thickness is but I reckon it must be somewhere between 1.0mm and 2.00mm, my original pipes are still in good condition and I was loathe to saw them up to find out.
In any event the Motad replacement header system outlet pipe is has a clear open area of 1364sqm. Whereas the original outlet is restricted to somewhere between 962sqm and 1075sqm.
When I fitted the Motad headers the power band almost evaporated and a gas analyser showed it be running far too weak, this being supported by the plug colour, which was whiter than the bird that new seven dwarfs.
A further test was done by a lazer temp gauge on the exhaust clamp bracket of both original and new pipes and this showed the exhaust gas temp had risen.
To solve the issue the Motad pipe was sleeved down first to 1075sqm which improved things no end, and finally down to 975sqm, which seemed to be better.
Plugs were checked and exhaust gas analysed and the results were as good as I could get them.
My guess is you need to sleeve the outlet down to below 1000sqm. I used a bit of old heating pipe.
I have some spare pipe left over from when I did mine, so if you live near Bolton, you can borrow it and see if it works.
Or I can fit it for you (it's already pre-drilled to enable removal) and you can test by going up a hill near where I live.