Its Done! Pics of my IRIS control valve mod

joeaxial · #1 11-06-2005, 07:48 AM

I got my SVX back on the road yesterday after replacing all the hardened air, vacuum and water lines under the intake. I mentioned in a previous thread that my IRIS control valve diaphragm was shot. After doing a parts search I found that the valve cost about $360.00 list and there were none available in any of the Subaru parts warehouses in the US. One dealer in the entire US had one available at list price + big shipping. Decided that to get the car back on the road I'd have to take matters into my own hands. Looking around the shop the only vacuum diaphragm that I could find that had similar diaphragm area and stroke was a vacuum secondary control from an old Holley 4160 4bb carb.
So here they are, pictures of my succesful (if a bit crude) mod:

I also fixed a broken hose nipple on the VC tank by threading it with 1/8" NPT and inserting a hose barb into it:

BTW: after replacing all the cracked and leaking vacuum hoses, my CEL code 34 for the EGR system disapeared.

I feel that the top end power is a lot better with the IRIS system functioning properly. I also installed the ECUtune Stage 1 at the same time so that could be part of the change too.

Mychailo, thanks again for your help with the How To, parts list, and photos.

Steve

SilverSpear · #2 11-06-2005, 08:52 AM

Great work Steve

and thanks to the good guys of this forum like Michaello, Harvey, Chike, SVXfiles, Tom and the others for their constant help.

mbtoloczko · #3 11-06-2005, 09:54 AM

Nice job with the repairs. Looks like you have some fabrication experience.

joeaxial · #4 11-06-2005, 03:31 PM

Thanks. I'm not exactly a master fabricator, but do have a pretty well equipped shop. The only tools needed that the average weekend mechanic would probably not have were a die-grinder type cutoff wheel, wire feed welder and a tap and die set.
Steve

Quote:

Originally Posted by mbtoloczko

Nice job with the repairs. Looks like you have some fabrication experience.