Hello you all. To all of you experienced engine builders out there i have a question for you. The plan is to use EFI on a '71 455 engine. To operate such systems the installation of an oxygen sensor is required, generally in the downpipe of the exhaust. Now in this case exactly this location is not an option. Why? The danger of loosing the status of "historical vehicle" during the periodic technical control of the vehicle in my country. Now to my idea and question: Would it be possible to install the oxygen sensor in the orifice of the exhaust crossover of an original '71 intake manifold where the bi-metal spring for the choke is originally located, and would it get accurate and correct values to operate an EFI system trouble free. Thank you for your help and comments Alain Kieffer
No, it needs to sample the bank in a free flowing section past the collective of the four exhaust tubes. You will get poor sampling from the choke exhaust well. Can you use a removable section of pipe and swap it out for inspections?
So you can install an efi, but the "historical vehicle" exemption only applies to the o2 sensor location?
Won't they see the throttle body anyway? What difference does an O2 sensor make at that point? Not sure how comprehensive your inspections are, but with my fitech system I installed the sensor on the collector facing the inside (or center) of the car. Its only visible if you get up underneath towards the center of the car.
Thats what i was thinking too. Removable section is a possibility yes. I try to get in touch with the owner of a known speedshop in my country. They used to build several Novas couple of years ago with the msd atomic efi when this system appeared on the marked. He had to deal with the same problems maybe he can tell me what how he solved it. Thanks for the info.
No, no you can't. To get and to keep the historical status your vehicle must have 30jrs of age, be all original, no mods. Then you get the status which includes: 25$ tax per year (compared to a normal homologation of a modern car a new dodge challenger for example around 1000$ tax) , only every two years technical control, brakes,lights, emisson test, engine bay check, vin nbr, check underneath the car,brake lines, fluid loss etc. The inspectors are getting more knowledge the last few years about what is original and what not. But driving through the inspection lane with a 71 Riviera with 17 or 18 " rims and an oxygen sensor on a supposed carburated car spotted by the examinator underneath , chances are high , they won't let you pass and take you away the status.
Well , it is always a bit of a gamble. Generally they want you to open the hood and look for headers, if the battery is secured, not sitting loose etc. Not in 25 years with all my US cars did an inspector make me remove the air filter assembly, but if the guy underneath the car would spot an o2 sensor.... i can hear him yell already and then full program: vehicle aside and then they check everything, they'll even put it on a dyno and if you have 5hp more than stated on your title or official papers then goodnight. No this would have been only for stealth.
Interesting. I never knew what went into those inspections and what the rules were regarding modifications. Intriguing, but unfortunate that you are so limited. The way things are going here, we'll likely be joining you sooner rather than later though.
Buy 2 matching sets of collectors install the O2 bung in 1 of your collectors. Run the system for several months so that it can learn. Install one of your spare collectors in place of the O2 equipped collector. Turn off EFI systems learn function and run car to inspection. Reinstall O2 collector and turn on learning again untill next inspection...
The last 3-4 years things changed pretty much, it's getting tighter for the classic car community. Technical control is getting tighter , you have to present your vehicle in a technical state close to perfect. Few years ago the inspectors were a bit more forgiving in general. People are complaining about taxes and fuel price rising constantly , they are upset against our community saying why you only pay 25 dollat taxes for your big displacement v8 and we have to pay 150-200 dollar in the best case for our hybrid. Then gas price is about 6,7 $ per gallon. The European Union us voting more and more restrictive laws against our vehicles. I don't know where all this leads us to.
Ok that's the way to go. Do all of the EFI systems on the market have the ability to turn off the learning function off ?
