Chevelle EFI install...

[Yelcamino]

Hey guys, I'm finally getting around to installing EFI on my Chevelle and thought you might like to follow along and see how things go. After a lot of bouncing around online checking out the various systems available, I decided to give Mass Flo a try.

Overall everything looks to be of decent quality; the throttle body is billet (very nice piece), the harness looks nicely done, and all the little parts seem to be good quality.




So far, the only concern I have is the air meter; it looks pretty small compared to the four holes on the throttle body...




On the fuel supply side I went with Aeromotive...



At the moment I'm disassembling the Chevelle and trial fitting things. Because the throttle body looks to be about half the height of the carb, a potential pita will be getting the air cleaner at the right height so it still seals against the bottom of the hood.
I guess I'll cross one bridge at a time.

[tintman]

I may be stating the obvious, but it looks to be the same set up as a mass air flow fox mustang efi on a custom intake. Just curious if that is the case. A9l is also the fox ecu part #. I would be curious how easy it would be to build this set up from take off parts.

[Motown 454]

It will be nice to watch as you get it running.

[Yelcamino]

I may be stating the obvious, but it looks to be the same set up as a mass air flow fox mustang efi on a custom intake. Just curious if that is the case. A9l is also the fox ecu part #. I would be curious how easy it would be to build this set up from take off parts.

It could be, I'm not sure.

The web page says: "This mass air flow meter is designed to work with the Mass-Flo EFI custom 1000 CFM throttle body."

So who knows?

[Yelcamino]

It will be nice to watch as you get it running.

Yeah, I'm looking forward to it. I just hope it doesn't take forever for me to round up all the little bits and pieces that aren't included in the system.

[BonzoHansen]

I may be stating the obvious, but it looks to be the same set up as a mass air flow fox mustang efi on a custom intake. Just curious if that is the case. A9l is also the fox ecu part #. I would be curious how easy it would be to build this set up from take off parts.

that would be great to know if the part fails, easier to get a replacement

[Yelcamino]

that would be great to know if the part fails, easier to get a replacement

That's supposed to be one of the positive aspects of this system - a lot of the components have factory part numbers.

[93Polo]

I assume this is going on your 468" motor with the Schubeck lifters. I am really intersted to see how this turns out.

If you are concerned about the Mass Air Sensor some of later GM LSx MAFs are ~100mm.

Also, plenty of guys on ls1tech have converted to 4 barrel style intakes with a 4 barrell style throttle body like you have. They run an air hat that many of the carbed centrifugal blower guys run. Then fab up a pipe that mounts the mass air sensor in the center with the air cleaner near a cold air source. I think they were getting a hat made by procharger.

[Yelcamino]

I assume this is going on your 468" motor with the Schubeck lifters. I am really intersted to see how this turns out.

If you are concerned about the Mass Air Sensor some of later GM LSx MAFs are ~100mm.

Also, plenty of guys on ls1tech have converted to 4 barrel style intakes with a 4 barrell style throttle body like you have. They run an air hat that many of the carbed centrifugal blower guys run. Then fab up a pipe that mounts the mass air sensor in the center with the air cleaner near a cold air source. I think they were getting a hat made by procharger.

Yes, you're correct, this is going on the Schubeck equipped engine.

Thanks for the tip on the LSx MAF idea; I'll keep that in my pocket in case I need it!

[wiedemab]

It has been awhile since I look at the Mass-Flo stuff so it may have changed. Please correct me if I'm wrong.

My research led me to believe that they were using an A9L Ford EECIV as the engine controller. I'm not positive on the MAF, but I think it may be a GM type MAF that they have some sort of a converter to communicate to the A9L. The Mustang MAF for the A9L outputs a 0-5V signal to the ECU. I think the GM MAF's output a variable frequency signal, but not sure.

Here are couple of links that I found with a Google Search.

http://www.thirdgen.org/techboard/tp...loefi-com.html

Post #6
http://www.stangnet.com/mustang-foru...p-warning.html

I also think they are converting the distributors to use the Ford ignition module.

My experience with the Fox Mustangs is the A9L is a pretty good ECU and easily tuned. It will learn over time within a range - basically it has to be pretty close to start (narrow band O2 at least on the factory setup) with and it uses correction factors to skew the table values.

Anyway, I've rambled long enough. Keep us updated on how the install etc. goes.

Later - Brandon

[LSXfan]

it is a GM MAF, truck or 02+ LS6 style and it is a freq output system

[Yelcamino]

I got a couple of hard lines done yesterday, one front and one rear...





I ordered a couple of 90* ORB-AN fittings from XRP today for the other two lines. It turns out I won't be able to make the bends as tight as I originally pictured. Fortunately the XRP fittings will solve my problem.

In case you're wondering, the hard line is 1/2" stainless and it takes a professional bender (not me, the tool) to make clean bends...



Top one is for 1/2" and the bottom one is for 5/8".

[Denvervet]

Keep us posted. Looks like a good setup. I am about to do similar plumbing for my setup and anxious to see how yours comes out.

[dino]

Hello All,
I have the Mass Flo Efi setup on my 69' chevelle the car has a Shafiroff 598 crate motor in it which made 797 hp with the Holley 950 on the engine dyno. I first set the car up with the carb thinking the driveability would not be to bad,and it was not that bad as long as you did not mind driving a car that felt like a drag car on the street loading up at lights etc.The car ran awesome,but i got tired of 3-4 miles per gallon and smelling like gas after a cruise. We just took our maiden cruise the other night with the mass flo system and let me tell you it runs like a different car. Incredible throttle response,and it was great with the carb but it is unbelievable now. At part throttle cruising the engine seams much smoother.
I should be done with all the little stuff left to do, and will take a long cruise when its complete and post the results, but as of now all I can say is it is AWESOME.
Tony

[Yelcamino]

Hello All,
I have the Mass Flo Efi setup on my 69' chevelle the car has a Shafiroff 598 crate motor in it which made 797 hp with the Holley 950 on the engine dyno. I first set the car up with the carb thinking the driveability would not be to bad,and it was not that bad as long as you did not mind driving a car that felt like a drag car on the street loading up at lights etc.The car ran awesome,but i got tired of 3-4 miles per gallon and smelling like gas after a cruise. We just took our maiden cruise the other night with the mass flo system and let me tell you it runs like a different car. Incredible throttle response,and it was great with the carb but it is unbelievable now. At part throttle cruising the engine seams much smoother.
I should be done with all the little stuff left to do, and will take a long cruise when its complete and post the results, but as of now all I can say is it is AWESOME.
Tony

Cool! That's very encouraging! Thanks for posting and I look forward to hearing how it turns out when you're done!

[My427stang]

Hello All,
I have the Mass Flo Efi setup on my 69' chevelle the car has a Shafiroff 598 crate motor in it which made 797 hp with the Holley 950 on the engine dyno. I first set the car up with the carb thinking the driveability would not be to bad,and it was not that bad as long as you did not mind driving a car that felt like a drag car on the street loading up at lights etc.The car ran awesome,but i got tired of 3-4 miles per gallon and smelling like gas after a cruise. We just took our maiden cruise the other night with the mass flo system and let me tell you it runs like a different car. Incredible throttle response,and it was great with the carb but it is unbelievable now. At part throttle cruising the engine seams much smoother.
I should be done with all the little stuff left to do, and will take a long cruise when its complete and post the results, but as of now all I can say is it is AWESOME.
Tony

Yes very good to hear, although work has got in the way lately, I am doing one for my 489 FE too.

I wont hijack, but here are a couple pictures to keep the three of us mutually motivated LOL









Good luck to both of you, I can't wait to hear more and hopefully they all run as well as Dinos seems to!

[Yelcamino]

Yes very good to hear, although work has got in the way lately, I am doing one for my 489 FE too.

I wont hijack, but here are a couple pictures to keep the three of us mutually motivated LOL







Good luck to both of you, I can't wait to hear more and hopefully they all run as well as Dinos seems to!

It's great to see that I'm not the only one on this forum giving something different a try. Send updates as you progress, I'd like to see how yours turns out as well!

[Yelcamino]

Update: I finished the hard lines on the manifold and made a throttle/return spring bracket.

Here's the bracket...



Here are the two front lines...



And here are the two rear lines...

[Motown 454]

Very interesting guys keep us in the loop.

[My427stang]

Looking good Coastie!

AF has me all over the place and deploying soon, but I hope to have mine running before mid April.

Ran hard line to/from the tank yesterday, looking pretty good, after that, under hood plumbing and wiring and it should run!

Keep up the good work