Mass Flo EFI Inc

[olddog]

Ronbo I'm no expert and just learning myself. I don't feel qualified to be telling anyone what to do, however I must pass this on to you. Everything I have read of EFI from many sources warns that locating the O2 sensor too far from the engine will cause problems. Even MassFlow tells you this in their instructions. Everyone seems to say it is better to put the O2 in a single tube than locate it too far away at the collector. I think 15" to 18" from the head is what I read the most. Mine is set up this way.

If you have not installed the headers and side pipe yet, I think it would be best to locate an O2 bung in a single tube at the recomended distance on each side. If you want to try it at the collector first, you can plug the other bungs. At least you would then have either option with the least amount of work.

I on the other hand, am thinking of adding a bung at the collector so I can put a wide band O2 in so that I can work on tuning the system. So I think the bung at the collector is a good thing to have. I just don't know that it is a good place for the O2 connected to the EEC.

[Roger Cormier]

Ian, you might want to pick up the Nov. issue of Hot Rod magazine because the cover story they have the different types, and installs of EFIs.

[Ronbo]

It's a tough call, put it at the collector so you sample all cylinders or at a single pipe higher up. The mass-flo system uses heated sensors so this helps with the distance somewhat. The sensor element also presents a greater restriction to the single pipe than the collector location.

Anyhow, input from others has stated that the system works fine in either position. Kirkham welded the bungs in the sidepipe collectors for me and Joe stated that it's the best place to put them in their experiance.

I'm getting pretty close to having the car finished now so I'll know soon...

[sandpitcobra]

Originally Posted by Roger Cormier

Ian, you might want to pick up the Nov. issue of Hot Rod magazine because the cover story they have the different types, and installs of EFIs.

Thanks Roger I'll pick one up. I am surprised at the lack of replies to this post. Do I take it from this that not many people have this bit of kit fitted?

Rgds,

Ian

[Ronbo]

Originally Posted by sandpitcobra

Thanks Roger I'll pick one up. I am surprised at the lack of replies to this post. Do I take it from this that not many people have this bit of kit fitted?

Rgds,

Ian

Not many, most folks opt for a carb or stack injection. Do a search for Mass-flo threads.

[Velox]

I put this system on my 545 after considering many of the EFI setups available. I had the standard big Holley previously and wanted to preserve the conventional look somewhat rather than a stack setup. I talked to Chris at Mass-Flo a number of times and finally went ahead. It was worth the money to me, I like it, and it solved all the concerns I have always had with my carb setups. I spent extra for the fuel system kit, probably if I did this again I would source my own parts especially a smaller inline fuel pump which I have since changed to. Chris shipped my system, injectors, computer and everything based on my CID, cam, compression ratio etc. It starts right up cold or hot, very smooth accel, so yes, for me it was worth it.

[sandpitcobra]

Velox,


Thanks for your post and picture. It looks great. I am erring towards spending the money for the look and the ease of installation as this kit is so easy to install. I am in Dubai in the middle east so on my own as far as setting things up and sourcing parts.

Ian