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I've already rebuilt mine, and it didn't help.
Two questions to those that have done this:
1) What did you use to smooth the piston and cylinder?
2) What did you use for lubrication?
Thanks,
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Greg Holden
96 GSR, JSRC @10psi, All the Goodies!
Best 1/4 ==> 13.937 @ 101.41mph (at 6psi)
My JRSC Install Site
Greg,
I spoke to Corky Wednesday afternoon... I mentioned to him some of the problems that a few guys have had on this board. I wanted to see if there was anything he could do to help. His reply was this:
Send the problem regulator back to him directly with a detailed note about the problems that you are experiencing. He will personally modify the regulator to satisfy each and every customer. Include contact numbers in case he needs additional information.
So, I suggest you SEND IT BACK my friend.
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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
My only problem with it is that it is "sticky" under vacuum and sometimes keeps the pressure stuck at 35psi idling. Most times it doesn't idle FP go under 30psi, but when it finally "releases", idle FP will go to where I set it with the AEM FPR, 25psi. I'm guessing this is because the piston is binding in the cylinder when vacuum tries to suck it out.
On boost performance is fine.
At this point I'd rather rebuild it again myself and have it back on the car in an hour. Than be without it for a week or so.
Greg, Which model of Cartech do you have? My 2020 has the sticky piston problem too and I just took it apart last night to polish the piston and cylinder with emery cloth and lubed with Sil-Glide. The piston was showing signs of rubbing and created shinny spots on top and bottom. When it was sticking, it also had the idle pressure problem. I'm sending it in to have it modified soon...
JT
Sounds like this was what I was talking about all along. Mine's set @ 55 idle, but would read 45 now and then until I boost which seems to work normally.
I didn't realize this was "normal" and such a common occurence.
Is this condition limiting performance or reliabitly potential?
Greg, I noticed an immediate improvement when phyically pushing the piston by hand. It was sticking prior to polishing. Now it moves in and out normally. My idle pressure is back to normal at 26psi steady. It was sticking at 21psi -28psi prior to the rebuild.
JT
[This message has been edited by JT98CivicEX (edited June 23, 2001).]
I don't think it affects performance or reliability. 6+psi is a lot of force and will move that piston no matter what. (Ever blow into a boost gauge and see what you can do with your lungs? NOT MUCH! I doubt many people can even produce 2psi this way.)
I believe 20" vacuum is sort of negative 2psi.
On another note, I've just bored out the cartech restrictor to 1/16" and reduced its' length by 2mm. Hopefully this will speed up its' reaction time. (I still get a little bog when flooring it from vacuum). We'll see tomorrow.
JT98CivicEX: I have a 20005.
Did your rebuild help at all?
Greg