Jaymanbikes Posted February 9, 2017 Share #1 Posted February 9, 2017 (edited) Slowly learning everything I can about the EFI system on my 77-280Z. I'm fortunate to have a 77K mileage car that runs great, just really tired looking under the hood. I have purchased another EFI system that has been cleaned up and shaved of the EGR. Its my desire to slowly switch over things and learn along the way. . Can someone tell me the purpose of the attached water inlet under the air regulator. It was omitted from the system I purchased and I wonder what impact this might have on performance of the EFI. I have been unable to find it in the FSM. Thank you Edited February 9, 2017 by Jaymanbikes Link to comment Share on other sites More sharing options...
mentalite Posted February 9, 2017 Share #2 Posted February 9, 2017 Like you, I have been fiddling in that area and wasn't able to find it in the manual. My guess is that it circulates coolant under the AAR to assist in closing it as the engine warms. Link to comment Share on other sites More sharing options...
S30Driver Posted February 9, 2017 Share #3 Posted February 9, 2017 Mentallite is correct. It is a block under the AAR that the coolant loops thru to heat the bi-metallic spring in the AAR. In the 1st picture, the factory steel lines have been replaced with braided hose, they likely failed due to age & corrosion. (a fact I can attest to) Link to comment Share on other sites More sharing options...
Jaymanbikes Posted February 9, 2017 Author Share #4 Posted February 9, 2017 Mentallite is correct. It is a block under the AAR that the coolant loops thru to heat the bi-metallic spring in the AAR. In the 1st picture, the factory steel lines have been replaced with braided hose, they likely failed due to age & corrosion. (a fact I can attest to)Thanks guys, that was my guess, also explains why the hoses seem to be a home-made retro..Sent from my iPhone using Classic Zcar Club mobile Link to comment Share on other sites More sharing options...
siteunseen Posted February 9, 2017 Share #5 Posted February 9, 2017 I've always heard it called a warming plate for the AAR, like said above. When you delete the EGR that has to go as well. The thermal vacuum switch has hoses going to the BPT then to the bottom of the throttle body. When you swap that over you'll want to plug that hose, I put a small bolt in mine, circled in yellow in my picture. Curious, did you buy Geoff's aka rossiz system? Link to comment Share on other sites More sharing options...
Jaymanbikes Posted February 9, 2017 Author Share #6 Posted February 9, 2017 11 minutes ago, siteunseen said: I've always heard it called a warming plate for the AAR, like said above. When you delete the EGR that has to go as well. The thermal vacuum switch has hoses going to the BPT then to the bottom of the throttle body. When you swap that over you'll want to plug that hose, I put a small bolt in mine, circled in yellow in my picture. Curious, did you buy Geoff's aka rossiz system? Ahh, that makes sense. Yes, I did buy his set-up from him, thanks for the tip on that one BTW. Hopefully going to save me a lot of time and dollars as opposed to fixing my old system up. Link to comment Share on other sites More sharing options...
Jaymanbikes Posted February 9, 2017 Author Share #7 Posted February 9, 2017 18 minutes ago, siteunseen said: I've always heard it called a warming plate for the AAR, like said above. When you delete the EGR that has to go as well. The thermal vacuum switch has hoses going to the BPT then to the bottom of the throttle body. When you swap that over you'll want to plug that hose, I put a small bolt in mine, circled in yellow in my picture. Curious, did you buy Geoff's aka rossiz system? siteunseen, question about your blue/black hose routing. Yours is routed the same as my factory set-up. Geoff's is reversed, doesn't seem to matter, would you agree? Link to comment Share on other sites More sharing options...
siteunseen Posted February 9, 2017 Share #8 Posted February 9, 2017 (edited) Those hoses were changed from '77 to '78's. I rerouted mine to the '78's, it feeds the AAR with cleaner air if I remember right. Here's the way I ran mine after reading about that issue with the '77's. Edited February 9, 2017 by siteunseen Link to comment Share on other sites More sharing options...
siteunseen Posted February 9, 2017 Share #9 Posted February 9, 2017 That hose I plugged appears to go to the BCDD after looking closer. I think it is considered "ported vacuum"? That was a few years/beers ago when I did mine and a lot of reading and asking questions on classiczcars.com. Link to comment Share on other sites More sharing options...
Jaymanbikes Posted February 9, 2017 Author Share #10 Posted February 9, 2017 7 minutes ago, siteunseen said: That hose I plugged appears to go to the BCDD after looking closer. I think it is considered "ported vacuum"? That was a few years/beers ago when I did mine and a lot of reading and asking questions on classiczcars.com. Here is the set-up I received. I have not seen a fuel rail run in this manner, looks clean. Link to comment Share on other sites More sharing options...
siteunseen Posted February 9, 2017 Share #11 Posted February 9, 2017 He may have gotten the idea from @Blue? But if you'd seen the motorcycles Geoff built he probably saw the simplistic solution himself. Link to comment Share on other sites More sharing options...
inline6
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now