SR20 IACV Delete - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MrSlappy · 07-30-2013, 09:16 AM

I'll be putting my SR back in soon and was thinking about deleting the IACV to reduce clutter in the engine bay. Before I did anything drastic I was wondering if any experienced SR guys could chime in. I don't want to make the car run like shit, but I wouldn't mind if the idle's rpm bounced around a little. I tried to find potential videos of cars with deleted IACVs, but only found a couple that showed two very different outcomes. Anyone ever done it before? If so, how did it turn out?

cotbu · 07-30-2013, 11:14 AM

I've done it before, many times! The outcome is always the same every time, Idle's like stock, higher vacuum.
This is what I do after the IACV has been blocked off and intake pipe modified. Go into timing mode, adjust base idle via throttle plate, leave timing mode. Rev engine, to about 4500rpm, apply brakes to try and make engine stall. Test drive same test, real world. done. This my experience with SR's though and most had atmospheric BOV's.

Mikester · 07-30-2013, 11:41 AM

With an aftermarket intake manifold, the clutter factor is minimal... However, there is beauty in simplicity~

MrSlappy · 07-30-2013, 01:41 PM

Quote:

Originally Posted by cotbu

I've done it before, many times! The outcome is always the same every time, Idle's like stock, higher vacuum.
This is what I do after the IACV has been blocked off and intake pipe modified. Go into timing mode, adjust base idle via throttle plate, leave timing mode. Rev engine, to about 4500rpm, apply brakes to try and make engine stall. Test drive same test, real world. done. This my experience with SR's though and most had atmospheric BOV's.

That's encouraging! Please excuse my ignorance, but what exactly is 'timing mode'? I'm assuming some sort of ecu mode??

*TheRealSy90* · 07-30-2013, 05:12 PM

Also considering this since I live in a place that is always hot. I know in places that have 4 seasons it's not really a good thing to do.

Mikester · 07-31-2013, 07:22 AM

Quote:

Originally Posted by TheRealSy90

Also considering this since I live in a place that is always hot. I know in places that have 4 seasons it's not really a good thing to do.

I would think the opposite would be true in this case. Always hot means AC is important to have. AAC/IACV adjusts the idle for when the compressor kicks on. I'm sure there is a way around that, but still might be less ass pain to keep it. If you don't have AC, then yea nothing to consider.

As far as 4 seasons goes, this tells me that AC is only needed in the summer; and running the heater won't affect the idle to the degree of the AC compressor. Unless I have this backwards, it seems to me that a milder climate would be the optimal place to delete the AAC valve.

07-30-2013, 09:16 AM	#1
MrSlappy Join Date: Sep 2012 Location: Alabama Age: 25 Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	SR20 IACV Delete I'll be putting my SR back in soon and was thinking about deleting the IACV to reduce clutter in the engine bay. Before I did anything drastic I was wondering if any experienced SR guys could chime in. I don't want to make the car run like shit, but I wouldn't mind if the idle's rpm bounced around a little. I tried to find potential videos of cars with deleted IACVs, but only found a couple that showed two very different outcomes. Anyone ever done it before? If so, how did it turn out?

07-30-2013, 11:14 AM	#2
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	I've done it before, many times! The outcome is always the same every time, Idle's like stock, higher vacuum. This is what I do after the IACV has been blocked off and intake pipe modified. Go into timing mode, adjust base idle via throttle plate, leave timing mode. Rev engine, to about 4500rpm, apply brakes to try and make engine stall. Test drive same test, real world. done. This my experience with SR's though and most had atmospheric BOV's. __________________ LoverTechnologies "Half Broken Things!" Last edited by cotbu; 07-30-2013 at 11:16 AM.. Reason: Or was it lower vacuum damn! ICR!

07-30-2013, 11:41 AM	#3
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 50 Posts: 1,938 Trader Rating: (0) Feedback Score: 0 reviews	With an aftermarket intake manifold, the clutter factor is minimal... However, there is beauty in simplicity~ __________________

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