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Ffs........setting co2 levels!!! Aaaarrrrggghhhhh

andirsv1

andirsv1

Joined Jul 2007
3K Posts | 0+
West Lothian, Scotland
Right, I have a gunson gas analyser......like this

http://www.ebay.co.uk/itm/Gunsons-Digital-gastester-CO-Analyser-Austin-Healey-DB5-/320744444454?pt=UK_Diagnostic_Tools_Equipment&hash=item4aaddbd226#ht_1153wt_689

But when I connect it to the down pipe, it simply annihilates the ****** wee diaphragm:angry this is the second replacement one that's just ****** up. I got the front level to 3.5 but then noticed the diaphragm was burst so still don't know if it's accurate:angry:angry:angry

Anyone know if there is a stronger diaphragm available for this ******* machine, or know and trust anyone locally with a decent one. ****** off with this now as been thought 3 diaphragms and over 3 weeks what with waiting on the replacements arriving and just want it ****** done now!!!!:angry
 
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andirsv said:
Right, I have a gunson gas analyser......like this

http://www.ebay.co.uk/itm/Gunsons-Digital-gastester-CO-Analyser-Austin-Healey-DB5-/320744444454?pt=UK_Diagnostic_Tools_Equipment&hash=item4aaddbd226#ht_1153wt_689

But when I connect it to the down pipe, it simply annihilates the ****** wee diaphragm:angry this is the second replacement one that's just ****** up. I got the front level to 3.5 but then noticed the diaphragm was burst so still don't know if it's accurate:angry:angry:angry

Anyone know if there is a stronger diaphragm available for this ******* machine, or know and trust anyone locally with a decent one. ****** off with this now as been thought 3 diaphragms and over 3 weeks what with waiting on the replacements arriving and just want it ****** done now!!!!:angry
Click to expand...

Are you using the aprilia crossover kit to connect to the headers ?
 
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hmm.

I have a gunsen pro version and never had a problem. Don't know if the pro uses the same diaphragm as yours but i suspect so. It has done loads of readings without issue.

Griff had one like yours he took in his van and it was fine so it's not an inherent issue. Maybe they had a duff batch of diaphragms that have sat on the shelf too long.

Or maybe your garage is too cold. The rubber may become brittle in -60 Scottish garage temps. I helped my mate fit braided brake hoses and rebuild the calipers in Dundee one winter and we couldn't bleed the brakes properly because the fluid went thicker in the mega cold and all the piston seals went stiff.
 
Spoonz said:
hmm.

I have a gunsen pro version and never had a problem. Don't know if the pro uses the same diaphragm as yours but i suspect so. It has done loads of readings without issue.

Griff had one like yours he took in his van and it was fine so it's not an inherent issue. Maybe they had a duff batch of diaphragms that have sat on the shelf too long.

Or maybe your garage is too cold. The rubber may become brittle in -60 Scottish garage temps. I helped my mate fit braided brake hoses and rebuild the calipers in Dundee one winter and we couldn't bleed the brakes properly because the fluid went thicker in the mega cold and all the piston seals went stiff.
Click to expand...

I just don't know buddy..... Is your diaphragm the same as this......

2012-01-30164116.jpg
[/IMG]

This diaphragm appears to be like tissue paper!!!!

I'll order another tomorrow and take it to the fire station and do it in the engine bay, it's warm in there!! Do you think the temp could be affecting it then Colin?? There isn't a lock off valve or something on the gunson machine I am missing is there?? Another few days wait till new one arrives and try again!!

Thanks for your help again mate, I'll get to the bottom of it sooner or later!
 
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it will work mate no worries, the reason its breakin is cos your connecting it without the one or more of the taps on the crossover is closed...

if you bell me ill talk you through it !!

speak soon !
griff
 
Makes sense if your blasting it with pulses from both cylinders at once. I always had one valve closed at all times which may explain why i never had an issue.

By the way Andi if your bike is anything like Sabres 2000 the rear cylinder trimmer is super doopa sensitive.
 
fusebox said:
it will work mate no worries, the reason its breakin is cos your connecting it without the one or more of the taps on the crossover is closed...

if you bell me ill talk you through it !!

speak soon !
griff
Click to expand...

Cheers Griff, I'll order another diaphragm tomorrow and give you a call when it arrives. Thanks buddy.
 
Spoonz said:
Makes sense if your blasting it with pulses from both cylinders at once. I always had one valve closed at all times which may explain why i never had an issue.

By the way Andi if your bike is anything like Sabres 2000 the rear cylinder trimmer is super doopa sensitive.
Click to expand...

Cheers Colin, which valves are we talking about here buddy?? The Gunson I have only has a single input so only connected to one header pipe at a time. I take it you are talking about having both pipes connected at the same time and having one valve shut when setting the other??


Think I see where the confusion is now!! When you asked if I was using the crossover, I should have said NO!!! I just have one input at a time.......sorry about that!!
 
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andirsv said:
Cheers Colin, which valves are we talking about here buddy?? The Gunson I have only has a single input so only connected to one header pipe at a time. I take it you are talking about having both pipes connected at the same time and having one valve shut when setting the other??


Think I see where the confusion is now!! When you asked if I was using the crossover, I should have said NO!!! I just have one input at a time.......sorry about that!!
Click to expand...

The Ape kit uses a crossover valve and a very long pipe which probably reduces the pressure at the reader compared to yours. If your pipe is quite short with no valve it may have too much pressure for the diagphram to handle.
If you want the Aprilia jobby to do it PM Sabre on AP and ask him to send you mine (he has borrowed it) and send it back when you have finished. It will fit in a jiffy back of medium size so wouldn't cost that much.
 
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Cheers Colin......I'll see if i can pick up a long length of pipe locally first .....thanks for the offer though. do you know if i can buy one myself? Searched on google. for aprilia crossover kit but no luck?
 
Would I be able to do this with a Telegan V3? (flue gas analyser). Shows CO2 (as %) and CO (as parts per million).
 
Spoonz said:
Don't see why not if you can get an accurate reading from the header take offs.

3.5% is 35000 PPM i think.
Click to expand...
Yep, 35000/1,000,000 x100 = 3.5% :) .


Should it be 3.5% front AND back?

Only trouble I can see is that I couldn't get the take off allen key caps out last time I tried and had my remap done with a combined front & back (so not ideal! :( ).
 
St0rmer66 said:
Yep, 35000/1,000,000 x100 = 3.5% :) .


Should it be 3.5% front AND back?

Only trouble I can see is that I couldn't get the take off allen key caps out last time I tried and had my remap done with a combined front & back (so not ideal! :( ).
Click to expand...

The useable range is about 3 - 4.5% (at about 1000 >1100 rpm and below fan temp) but the ones i have played with ran best at 3.5%. Run the rear a bit higher to aid rear cylinder cooling. (no air flow on rear cylinder or headers). If you find 3.5% best run the rear at 4% etc.
Anything above 4 really and your mates will complain you stink of fuel and below 3 you get surging and lots of overrun popping but as each bike is different set it and have a play and re adjust if needed.

check back and forth between each cylinder a few times as the readings can take a while to stabilise. You set it at 3.5 % and check a few minutes later and it's 3.8 etc. In an ideal world you should be checking vac and tps setting before setting the CO if they haven;t been done in a while.
 
TPS should be fine and is easy to do anyway. What's vac though? (sorry if stupid question).
 
St0rmer66 said:
TPS should be fine and is easy to do anyway. What's vac though? (sorry if stupid question).
Click to expand...

The vac is a means to measure how much air is passing into each Throttle Body via the bypass circuit. (closed throttle air flow) For smooth idle and fueling where the bypass circuit is active you obviously want each cylinder have a matched air flow. Adjusting it will affect idle speed and smoothness in the main but it does have a knock on affect of determining the hydro carbons in your exhaust reading at idle should it ever be an issue with emissions testing. (First thing that gets tweaked if you car fails it's MOT on emiisions before you throw mass airflow meters etc at them.)

It also affects your CO reading too so ideally you set the vac first and then adjust the CO. (adjust vac via mercury balancing tool etc) In truth i think if your CO is on the money the vac probably isn't far off but Griff would be better placed to comment on that as he will have seen a much higher volume of bikes than me.

Only exception to all of this is post 04 bikes where there are no CO trimmers (least not physical ones and you need a password even most of the dealers don't have to adjust via software)
 
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