Mike Rowe Posted November 7, 2008 Share Posted November 7, 2008 Excuse my lack of mechanical knowledge, but can these be removed or are they absolutely necessary? Quote Link to comment Share on other sites More sharing options...
ktown z Posted November 7, 2008 Share Posted November 7, 2008 I am no mechanic also but if you remove the ACC won't your idle hunt for a speed while cold. I would think it would surge up and down till fully warm. Quote Link to comment Share on other sites More sharing options...
mtnickel Posted November 8, 2008 Share Posted November 8, 2008 I am no mechanic also but if you remove the ACC won't your idle hunt for a speed while cold. I would think it would surge up and down till fully warm. Might not even idle fast enough when cold...unless you have some way to manually open it. I forget which is which, but there is a valve just for the A/C, and one just for the idle. The A/C one you can probably do without (obviously if you don't have A/C). Are you using a stock ECU? Other solution is to use one of the coil type Auxilary valves for warmup. It just lets more air in for a while till the coil heats up and shuts it (apply 12v at startup). That's a common solution for cold starts on megasquirt cars that don't want to deal with an idle valve. (like any of these: http://www.carpartswholesale.com/parts/nissan/nx/auxiliary_air_valve.html ) Mark Quote Link to comment Share on other sites More sharing options...
jerryb Posted November 8, 2008 Share Posted November 8, 2008 I removed my AAC on my RB20 with no problems at all! Starts up and idles fine....but then I dont drive the Z when its really cold....by Ontario standards. Quote Link to comment Share on other sites More sharing options...
ktown z Posted November 8, 2008 Share Posted November 8, 2008 LOL...Ontario standards! I live in Texas so anything below 60 degrees is bone chilling to me. If I can remove all the not needed parts before dropping the motor in without any side effects would be nice. Quote Link to comment Share on other sites More sharing options...
Mike Rowe Posted November 8, 2008 Author Share Posted November 8, 2008 I removed my AAC on my RB20 with no problems at all! Starts up and idles fine....but then I dont drive the Z when its really cold....by Ontario standards. Hi Jerry thanks for your feedback. Under the collector assembley on the RB26 is an air chamber with the AAC valve attached to that - did you just remove the valve or the whole air chamber and hoses hanging off it? regards Quote Link to comment Share on other sites More sharing options...
Mike Rowe Posted November 8, 2008 Author Share Posted November 8, 2008 Might not even idle fast enough when cold...unless you have some way to manually open it. I forget which is which, but there is a valve just for the A/C, and one just for the idle. The A/C one you can probably do without (obviously if you don't have A/C). Are you using a stock ECU? Hi Mark thanks for your comments. I am going to use A/C so do I have to have it for that? I have the stock ECU but also have bought an Apexi Dejetro which I will use after I get it started for the first time - or should I just start with the Apexi? regards Quote Link to comment Share on other sites More sharing options...
mtnickel Posted November 8, 2008 Share Posted November 8, 2008 I really dont' know much. All i know is there is a separate air valve specifically for when the A/C is turned on so the engine doesn't stall or bog. Also provides a few more revs for the A/C to work more efficiently. Alternatively, you could just set the idle a little on the high side anyways (800-900rpm). Mark Quote Link to comment Share on other sites More sharing options...
jerryb Posted November 8, 2008 Share Posted November 8, 2008 I dont recall an air chamber on the RB20....hmmmm? I'll go and look at the manual drawings. But I removed all the emission hardware. Quote Link to comment Share on other sites More sharing options...
ktown z Posted November 8, 2008 Share Posted November 8, 2008 I posted this question on other forums and everyone has stated that when they have removed the AAC or if it was unplugged that they all had idle problems. The only ones that have answered were all related to the RB20 though. Quote Link to comment Share on other sites More sharing options...
Mike Rowe Posted November 8, 2008 Author Share Posted November 8, 2008 ok, maybe not a good idea then, thanks regards Quote Link to comment Share on other sites More sharing options...
Canadianz Posted November 8, 2008 Share Posted November 8, 2008 I have an RB25det, and I removed the idle air controller and put a block off plate where it used to be. I am even using the stock ecu. Im not sure about the air chamber you are talking about, is it some sort of a balancer on the RB26 due to the ITB set up or what ? I am in the same boat as Jerry, my car runs great with no idle air controller even with a 90mm TB. My idle is slightly high (around 950) or so . . Any how I think you should be able to remove it, if you have all the stock hardware though it can't hut to leave it on either. Quote Link to comment Share on other sites More sharing options...
cheftrd Posted November 9, 2008 Share Posted November 9, 2008 Mike, the air chamber is what supplies air to the balance tube above the throttles. It has a mian tube that pulls from the plenum, and two tubes that run up into the balance tube. In addition to that, it also "sees" manifold vacuum and has a couple of nice 6mm hose outlets for gauges, etc. Removing it would mean having to find another way to get air behind the throttle plates. Additionally, the AAC valve makes for an idle-up solenoid for AC or cold-engine fast-idle. The screw that's in it is for idle speed. What you don't want to do is use the throttle stop and crack the throttles open more to bring the idle up. Matt Quote Link to comment Share on other sites More sharing options...
ktown z Posted November 9, 2008 Share Posted November 9, 2008 What do the two hard pipes that are connected to the ACC and are routed to the rear of the manifold and face up? I can't find what they are connected to in my 32 manuel. The other vacuum lines connect to the manifold and air chamber but these 2 are loners and are not connected to anything I can see. Thanks, James Quote Link to comment Share on other sites More sharing options...
Careless Posted November 9, 2008 Share Posted November 9, 2008 LOL...Ontario standards! I live in Texas so anything below 60 degrees is bone chilling to me. If I can remove all the not needed parts before dropping the motor in without any side effects would be nice. wow, torturing you folk must be easy. come work in a produce freezer during a january winter. my house's rad-heater just stopped igniting and the house is 16.2 C right now. It's friggen freezing in here! Quote Link to comment Share on other sites More sharing options...
Mike Rowe Posted November 10, 2008 Author Share Posted November 10, 2008 Mike, the air chamber is what supplies air to the balance tube above the throttles. It has a mian tube that pulls from the plenum, and two tubes that run up into the balance tube. In addition to that, it also "sees" manifold vacuum and has a couple of nice 6mm hose outlets for gauges, etc. Removing it would mean having to find another way to get air behind the throttle plates. Additionally, the AAC valve makes for an idle-up solenoid for AC or cold-engine fast-idle. The screw that's in it is for idle speed. What you don't want to do is use the throttle stop and crack the throttles open more to bring the idle up. Matt Thanks very much Matt for explaining all that. I need to run a line for my Turbo gauge, would one of these 6mm hose outlets be appropriate for the gauge? regards Quote Link to comment Share on other sites More sharing options...
cheftrd Posted November 11, 2008 Share Posted November 11, 2008 Thanks very much Matt for explaining all that. I need to run a line for my Turbo gauge, would one of these 6mm hose outlets be appropriate for the gauge?regards Yep. That or you can use the small one coming off the back of the balance tube. Quote Link to comment Share on other sites More sharing options...
Mike Rowe Posted November 11, 2008 Author Share Posted November 11, 2008 thanks very much Matt regards Quote Link to comment Share on other sites More sharing options...
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