I have a MSD distributer #8572w/tach drive & I don't rememberwhat control box I am using( plug in RPM limiter) ,I was told it will not work with fuel injection because it does not have a cam signal.If I am not having a senior moment I think someone I talked to at MSD told me this.

Is this a true statement?

How do I keep the old tach drive and run fuel injection?
and yes I want to keep the old tach drive operating.

Ok I bought a TPIS mini ram off e-bay, never ran on a car, the thing looks new,came with the fuel rail,and a BBK 58 MM throttle body.
I am running a Doug Nash 5 speed (don't know the gears in it right off )
magnesium bell housing W/ trilite hydraulic bearing (maybe )this bearing is very thick,I do not know if I can gain enough clearance to use it.
another e-bay buy was a big azz radiator ,it fits frame rail to frame rail,notched hood to clear filler neck,runs nice and cool now in HOT Houston,single puller fan,no shroud.
3:08 rear gear,aluminum flywheel,opinion on this forum seems to be this will be hard to drive on the street
motor is out of my old 69 impala 350 horse motor that is rebuilt,balanced,a set of edelbrock aluminum heads,again ( talked to edelbrock) I seem to have a possible machined wrong set of heads,I have angle plug and was told they no make it this way ??
also running dynomax coated 1-5/8 undercar headers into 2-1/2 full exhaust,no crossover stock mufflers.
I will be using a RCD Engineering dry cam belt drive.
I am going to do the speed density system,using a 7727ECM, mounted either under hood or inside ,don't know yet.
I will be buying a hydralic roller cam ( size??) ,and lifters.
that is most of the things I can remember now,project has been to long in the making ,maybe outdated before I get it running.
If you need more info just ask
I have no clue

I will also ask in c-4

 

I suppose it depends on what type of FI you are going for. The setup I have (Holley Commander 950) can use just about any distributor.

PDF Of C950 manual
Page 100 and up on that PDF shows many of the connection options for the setup.

 

anyone have any answers ,or will I have to hang in c-4

 

Most aftermarket EFI setups will run with your distributor, but will not be able to control timing. You also will not be able to run sequential as there is no cam sync signal. One option if you are set on keeping the tach drive is to run a crank trigger to the EFI and then the EFI triggers the coil via a spark box (MSD, Crane etc). The pickup in the distributor will then do nothing and timing is fully controled by the EFI.

What I don't understand is why you want to keep the tach drive? Why not convert the tach to electric and run a modern distributor? If done right the converted tach looks exactly like the original. You can even use your old face plate.

 

I had a holley pro-jection DI a few years ago for my 70.(this was the setup prior to the commander). Before I installed it I has the MSD tach drive distributor with a 6AL box. I was told I couldn't run a tach signal to the holley's computer with the MSD distributor. This limited the FI computer.

Found the MSD and the Holley techs at a NHRA national meet. Put their 2 heads together and got a hookup to use both and keep my mechanical tach hooked up. Not sure what you're using, but I can dig up the diagram if this is what you might need.

 

Until I get the schematic posted, heres a thread a few years ago about this.

http://forums.corvetteforum.com/show...um_id=3&arch=1

 

Sorry, about as clear as I can get it. This is the Holley pro-jection with the MSD 8572 and a 6AL box. Allows laptop adjusting while retaining the mechanical tach hook-up

[IMG][/IMG]

 

So if I am reading this correct in addition to the ECM #7727 the Pro Jection D1 is needed also?to keep old tach.

Dennis if you read my first post I have most items mentioned that I am using,and I am using the MSD 6-AL


Or If I am understanding Zwede saying the pick up will not function when if I use a crank trigger,why can you not use the non-working pick-up as a cam signal.

Sorry if I am not following this electrical stuff very well,Maybe this is why I want to keep the old tach ,because I can see how it works and fix it,this electric I just can not watch it work.

 

I used the method in Dennis's diagram to connect a Holley Commander 950 to my MSD tach dirve and 6AL. The key is to use the module from a small cap HEI distributor. The distributor's magnetic trigger will work with the HEI module. The C950 connects to the module and controls timing. The white wire runs to the MSD 6AL box to fire the coil. I have run it this way for two years without any problems. You need to lock out the vacum and mechanical advance on the distributor. You program your advance mapin the C950 management software. I looked into Zwede's option, I just was not ready to pull the dash apart. Let me know and I can find the part numbers I used.

 

The 7727 is not sequential and would not benefit from a cam sync.

Lock out the MSD distributor.

Run the two wires from the distributor to the two pins on the back side of a late model small cap HEI module. You can remote mount the module but you must heat sink it or it will die an untimely death.

Connect the 4 pin ignition harness from the 7727 to the 4 pin on the HEI module. You will need an adapter. If you look closely at the module you will see the letters, GBRE. Ground, Bypass, Reference, EST.
Wire accordingly.

Use a late model HEI coil and harness to plug into the two pin connector on the HEI module.

If everything else is properly installed. it will run.

To use your MSD ignition box follow the instructions for installing one on an HEI equipped engine.

rob

 

MrForce-

Any idea if the same setup will work with the '7165 (MAF) ECM. I'd like to keep my MSD billet distributor, but only if it will be computer controlled.

Thanks.

 

The edlebrock efi comes witha conversion kit so you can run your originial tach drive distro (wether points or HEI), and the system is multiport

 

I use the tach-drive MSD distributor with an MSD 6 box on an Accel DFI Pro-Ram setup (version 6). Accel has an IPU (Inductive Pick-Up) option to make it work. You can lock out the centrifugal advance as posted above and use the ECU to control the timing. The injectors fire in batch mode.

As I recall it was just simply the addition of a little wire harness and moving a pin on one of the ECU plugs.

Works great!

 

Yes, it will.

rob