Emerald IACV Alternatives
Discussion
Pandering to my need to try and make the install of the new ECU and it's component parts a neat as I cn I am canvassing some opinions . .
I would prefer to make an adaptor plate for the hole left by the old stepper motor, and use a compact design like the one below . . .
Compact one
Obviously I will need to block the bypass feed pipe ahead of the trottle butterfly, but it would get rid of the pipework and tidy the back of the plenum area up a little.
But would it be OK, and provide enough flow of air ? The V6 on the S used to run on just like this . ..
Most people seem to prefer to use the kind of design below, which for me means mounting it and sorting out the pipework, which although not hard, wouldn't be as neat, I don't think.
Other type
This will need some adaption for it to feed the plenum with air as well . . .
I have decided that I do want to run a IACV, because if I should want to run a wilder cam later on then this would come in useful, and anything to help it idle a little better is a good thing for me . . . .
I would prefer to make an adaptor plate for the hole left by the old stepper motor, and use a compact design like the one below . . .
Compact one
Obviously I will need to block the bypass feed pipe ahead of the trottle butterfly, but it would get rid of the pipework and tidy the back of the plenum area up a little.
But would it be OK, and provide enough flow of air ? The V6 on the S used to run on just like this . ..
Most people seem to prefer to use the kind of design below, which for me means mounting it and sorting out the pipework, which although not hard, wouldn't be as neat, I don't think.
Other type
This will need some adaption for it to feed the plenum with air as well . . .
I have decided that I do want to run a IACV, because if I should want to run a wilder cam later on then this would come in useful, and anything to help it idle a little better is a good thing for me . . . .
Some people who have left the standard stepper unplugged for long periods have reported that over time it can creep.
I'm not familiar with the 'compact' one but I can see two ports and I guess it joins these together when it is open. If so, you would need to provide some sort of manifold to bring air to one port and take the other port back to the plenum. It sounds a bit awkward. The other one seems designed to go in the middle of a bit of hose which would be easier, but you would still need to plumb it into the plenum some how. I seem to remember there's a spare port on the trumpet base that you might be able to use, but it's on the wrong side. Seems to me that the main decision you face is where to connect the two ends of the bypass. You have a good range of IACVs available and shouldn't expect any trouble once you have fixed the ends.
I'm not familiar with the 'compact' one but I can see two ports and I guess it joins these together when it is open. If so, you would need to provide some sort of manifold to bring air to one port and take the other port back to the plenum. It sounds a bit awkward. The other one seems designed to go in the middle of a bit of hose which would be easier, but you would still need to plumb it into the plenum some how. I seem to remember there's a spare port on the trumpet base that you might be able to use, but it's on the wrong side. Seems to me that the main decision you face is where to connect the two ends of the bypass. You have a good range of IACVs available and shouldn't expect any trouble once you have fixed the ends.
When installing mine, I went with the second type you've linked to. Although that one is a patent part so might not be as good quality as the original Bosch unit. I put the Bosch code listed on that auction into Ebay and managed to pick up a perfectly good Bosch one from for £10.
To make it work, I removed the old stepper and while the plenum was off, took it to a local motor factors who managed to find a sensor bung which plugged the old stepper hole perfectly. Show here (just) http://www.pistonheads.com/gassing/topic.asp?h=0&a... - its a little brass bung which sits flush to the plenum with a hex recessed into the top. I then got some slightly larger rubber pipe from the same motor factors and mounted the stepper in the pipe which replaces the throttle bypass pipe which fed the old motor. It sits behind the plenum so is invisible unless you really look for it, and when wired up to the Emerald system with a standard injector type two-wire plug, works perfectly. You can control its opening in 5% increments within the live adjustments screen and then put the values which work well into a table for auto control in normal running conditions. Combined with the ignition stabilisation it achieves a very stable idle (using the plenum screw to get 90% of the air and the other two bits to aid cold start etc).
There are of course other ways of doing it, but this one works well for me and cost less than £20 quid all in!
To make it work, I removed the old stepper and while the plenum was off, took it to a local motor factors who managed to find a sensor bung which plugged the old stepper hole perfectly. Show here (just) http://www.pistonheads.com/gassing/topic.asp?h=0&a... - its a little brass bung which sits flush to the plenum with a hex recessed into the top. I then got some slightly larger rubber pipe from the same motor factors and mounted the stepper in the pipe which replaces the throttle bypass pipe which fed the old motor. It sits behind the plenum so is invisible unless you really look for it, and when wired up to the Emerald system with a standard injector type two-wire plug, works perfectly. You can control its opening in 5% increments within the live adjustments screen and then put the values which work well into a table for auto control in normal running conditions. Combined with the ignition stabilisation it achieves a very stable idle (using the plenum screw to get 90% of the air and the other two bits to aid cold start etc).
There are of course other ways of doing it, but this one works well for me and cost less than £20 quid all in!
Edited by thenick on Thursday 24th January 17:46
Edited by thenick on Thursday 24th January 17:48
Take your pick
http://partfinder.smpeurope.com/index.html?p=155&typeid=18&recordset=209&value=18
Shows pictures of all the types availiable, and what car they fit.
http://partfinder.smpeurope.com/index.html?p=155&typeid=18&recordset=209&value=18
Shows pictures of all the types availiable, and what car they fit.
thenick said:
When installing mine, I went with the second type you've linked to. Although that one is a patent part so might not be as good quality as the original Bosch unit. I put the Bosch code listed on that auction into Ebay and managed to pick up a perfectly good Bosch one from for £10.
To make it work, I removed the old stepper and while the plenum was off, took it to a local motor factors who managed to find a sensor bung which plugged the old stepper hole perfectly. Show here (just) http://www.pistonheads.com/gassing/topic.asp?h=0&a... - its a little brass bung which sits flush to the plenum with a hex recessed into the top. I then got some slightly larger rubber pipe from the same motor factors and mounted the stepper in the pipe which replaces the throttle bypass pipe which fed the old motor. It sits behind the plenum so is invisible unless you really look for it, and when wired up to the Emerald system with a standard injector type two-wire plug, works perfectly. You can control its opening in 5% increments within the live adjustments screen and then put the values which work well into a table for auto control in normal running conditions. Combined with the ignition stabilisation it achieves a very stable idle (using the plenum screw to get 90% of the air and the other two bits to aid cold start etc).
There are of course other ways of doing it, but this one works well for me and cost less than £20 quid all in!
NickTo make it work, I removed the old stepper and while the plenum was off, took it to a local motor factors who managed to find a sensor bung which plugged the old stepper hole perfectly. Show here (just) http://www.pistonheads.com/gassing/topic.asp?h=0&a... - its a little brass bung which sits flush to the plenum with a hex recessed into the top. I then got some slightly larger rubber pipe from the same motor factors and mounted the stepper in the pipe which replaces the throttle bypass pipe which fed the old motor. It sits behind the plenum so is invisible unless you really look for it, and when wired up to the Emerald system with a standard injector type two-wire plug, works perfectly. You can control its opening in 5% increments within the live adjustments screen and then put the values which work well into a table for auto control in normal running conditions. Combined with the ignition stabilisation it achieves a very stable idle (using the plenum screw to get 90% of the air and the other two bits to aid cold start etc).
There are of course other ways of doing it, but this one works well for me and cost less than £20 quid all in!
Edited by thenick on Thursday 24th January 17:46
Edited by thenick on Thursday 24th January 17:48
Sorry I hadn't seen you post this, funny though, as I had worked on the same solution. I found a stanless steel pipe bung for the old stepper housing, and will wire in line the same as yourself. I'm running P38 coil pack so I need to find a neat solution for the location of the stepper motor, which I think I have done, but I'll post pics once done.
The one you list, is it 2 or 3 pins ? I presume by your comments it is 2 pin ?
I realise you can run without, I just wanted to make sure I had the ability to manage the idle easily even with a wilder cam if I wished to change from the Stealth in there at the moment, not that I do.
It will be interesting to see how mine does on the road, it's booked in with Dave on 8th April.
Currently there isn't a lot left in the engine bay as one thing leads to another. Paul Dove is making the loom for me, a whole bunch of bits have gone away for a spruce up. It's got no oil, no water or any fluid in it and all the hoses are off as well . . . . . Loads to do
Just picked mine up from Emerald today and it runs like a dream 
Great throttle response, extra punch all the way through and generally behaves better - well worth it!
Stepper, yes I used a 2 pin type of the same part number as that bosch one on the Ebay ad. The system seems to prefer using the stepper motor from very cold start and gradually shifts to ignition control as it warms up until pretty much only on ign control when warm. So I wouldn't say that the stepper is essential, but it does make cold starts a lot nicer from what i've seen so far. Feels like it pops and bangs less now as its getting fuel more precisely, but my Dad following me said that when it does pop on the overrun or hitting the gas big time, it flames quite nicely!
Great throttle response, extra punch all the way through and generally behaves better - well worth it!Stepper, yes I used a 2 pin type of the same part number as that bosch one on the Ebay ad. The system seems to prefer using the stepper motor from very cold start and gradually shifts to ignition control as it warms up until pretty much only on ign control when warm. So I wouldn't say that the stepper is essential, but it does make cold starts a lot nicer from what i've seen so far. Feels like it pops and bangs less now as its getting fuel more precisely, but my Dad following me said that when it does pop on the overrun or hitting the gas big time, it flames quite nicely!
Edited by thenick on Sunday 3rd February 17:13
Yeah that would probably do, its a slightly different part number but it looks the same...
Alternatively, here's the same one I use (looks a bit cheaper too!) http://cgi.ebay.co.uk/Saab-9000-900-IAC-Idle-Contr...
Alternatively, here's the same one I use (looks a bit cheaper too!) http://cgi.ebay.co.uk/Saab-9000-900-IAC-Idle-Contr...
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