My project is progressing nicely thanks to you all. I have a few more questions for you now. I've installed the Mikuni 44PPH today so I can fab up some pressure piping and the like. It still needs boost prepped, but I'll do that almost last. For now, I need to know a few things.

1) Does the Mikuni 44pph have OMP nipples on it so I can retain the OMP, or do I have to pre-mix? If it does have them, WHERE?!

B) How do I hook up the throttle line? It seems the cable is MUCH too long. I'll search a bit on this one - I'm sure it's been answered before.

6) There is a T fitting on the top of the carb for fuel. Why? Should I just cap one side off? What about the return line from the stock Nikki? Should I just cap that as well (talking about the one at the firewall that 90's off toward the old Nikki)?

2) I think a Mustang fuel pump is easily attainable for me. Is that an acceptable pump for 10psi? It is an EFI pump.

5) What FPR should I be running? If you have a brand name and part number, that is GREAT. Easy on the wallet is nice, since this is my budget project.

Thanks again guys.
Hope you appreciate the humor in my questions listing?

 

1) You can hook the original OMP lines up and connect the linkage to the throttle cable linkage. Personally though I removed the OMP and now add 2 stroke Amsoil as a Premix, it is the correct product for this type of application rather than using sump oil. I carry a thin funnel, add the oil, pour a little gas down the funnel to clean it then dry and repack while the fuel is running.

B) I had an oddball linakge that is adjustable, most curl around the linkage and the stock cable end locates in a designed slot. Do you have the connecting linkage?

6) What carb are you using I am using a Carter and capped the return line, works with no issues.

2) EFI pumps run much higher, you want a pump to push about 4.5 lbs, maybe more with your turbo but there is FPRs to control this. So Carter from Summit is $60, FPR is Holley and another $20, highly recommended combo for this set up.

5) See 2)

Maybe I'll bring the 7 in July......

Your numbering system sucks....lol

Steve

 

PS if you need more fuel than this go Holley blue, but it is cooled by air not the fuel, so don't lock it away inside the car, it needs airflow.

 

Lol, thanks Steve.

I'll make a block-off plate for the OMP today and start pre-mixing her. Thanks for the tip on the proper oil for her.

I do have the connecting linkage. I'll start looking into how to affix my cable to it. I think there's probly some threads on that specifically here - lots of people have probly asked.

My carb is a Mikuni 44pph. I think it wants 6psi at idle - but Im not certain on that one. I know that I defintely want an EFI pump that can deliver up to 36psi and a regulator to keep it down to 6psi at idle, adding 1psi per 1lb of boost through the range, is that correct? If so, where do I find such a boost-referenced FPR?

The numbering system was funny...............














Okay, maybe not.

 

First, post pics of the top, linkage and bottom of the carb. Makes instructions easier.

1. The mop nipples are on the bottom of the carb. But the ones set up for the SE's didn't have them, there are plugs instead.

6. Depends on the fpr you pick. You can also order the single inlet 'L' fitting from Wolf Creek.

2. When, if, I get to this point, I have a spare FC fuel tank that I will cut the fuel pump mount out of and install on the SE tank I have. Then you can I run a stock TII or the Walbro 255 lph in tank pump. You should figure a way to install the fuel cup the pump sits in for safety or go the other route and use a surge tank, if you use the 12A tank.

5. Fpr, Mallory 4309. There is an Aeromotive that some are using, do not know the part #.

There is a Mikuni thread that aussiesmg and I posted a bunch of pics in, you can use those pics, there may be some of the answers on hookups in there.

Since you have a 12A, I recommend upsizing and replacing both the supply and return hard lines to 3/8" All of the soft fuel lines will need to be replaced with FI rated hose and the FI clamps used, no worm clamps.

Drop the fuel pressure down to 4.5.

 

I have the same Mikuni set up but NA, so I'm not sure of the turbo demands, but I suspect you need volume not pressure. The EFI pumps are high pressure. How much HP do you expect? If its under 250 the Holley Blue should be more than enough, my 13B BP had a Holley Blue and put 250 at the flywheel.

I have no issue with premixing, some people dont like it because it takes more effort but it takes me about 10 seconds, I use quality oil like Amsoil which means I only need to add 1 oz per 2 gallons.

There was some recent Mikuni threads, I asked this question because I have an odd linkage, several pics were posted by Trochoid and others, they should help you out.

The numbers were amusing I wrote 1) then went to ........huh B) did a double take, then saw the rest, you knucklehead...lol

 

Hey Scott knew you were out there, posting at the same time again,

Take heed of this man's advice, he knows what he's saying and has great knowledge. He also will say if he doesn't know so he wont lead you astray.

Great point about larger fuel line my 13B had 12 mm, overkill I know but never ran short of gas.

 

One has to go to the efi pump because the fuel pressure needs to rise 1:1 with boost. Most carb pumps will not put out enough pressure when boost gets over 5 psi. This is where the 4309 comes into play. It will work with carb apps, has a return and can handle FI fuel pressures.

 

Great, then the 4309 is on my shopping list. Unfortunatly, it does not have a fitting for a pressure guage.

Also I'm wondering what to do with all the white connectors that used to go to the Nikki? Should I just clip them off to clean everything up a bit?

 

The 4309 has more than one outlet port, that is where the guage goes. Don't start cutting wires until you are finally done and running. I went overboard and unpinned all the wires I didn't need from the connecter. If I ever find the box I put them in, I can plug them back and go back stock some day. Not.

 

Sweet ***! I just got my fuel pump. It's for a 96+ Mustang Cobra - should flow well enough and provide more than enough pressure The Mallory 4309 will handle all of the extra un-needed stuff. I just placed an order for that too, it should be here Wednesday. Does anyone know what size guage/fitting I need to order? Is it safe to run a line and mount the pressure gauge in-car?

Also, I have 1 exhaust stud stuck in the block. That thing is REALLY in there. I've sprayed it with WD and vice gripped her with the grip of a 17 YO **** addict. It's still not budging, just destroying the threads. Any suggestions for getting that out?

 

get somthing better then WD <---that stuff stoped being good yrs ago.... you could also try some heat...or if you didint **** up the threads to bad put 2 nuts on it ....or do all of the above

i snaped mine but on the bright side if you snap them you can still use a welder and weld on top of the spaned bolt and weld a nut to it(the weld) and back it out that way
dont worry you wont weld the bolt to the housing its aluminum the heat will also help get it out <---- this is worst case just giving you the heads up

 

The studs are supposed to be in the block.

 

You need volume and pressure. The fuel pump needs to supply the recommended carb base pressure PLUS whatever amount of boost you're running. A Holley or any other low pressure pump will not cut it. EFI pumps are ideal.

 

^^ Yes, yes they are. But the threads were all junk so I'm replacing them. That eliminates double-nutting them... and unfortunatly for me, it snapped off clean and flush with the block when I used a stud remover. ^%@#$!


I might try this welding thing, but I'm not sure what to do. How bad will it leak with just the three studs/nuts on it?

 

Great! So my Mustang pump will do okay? It's a stocker for a 96+ Cobra...

 

Bad, somedays 4 aren't enough.

 

Is it an external pump?

 

Nope, it's an in-tank pump. I have to figure out how to mount the thing though.

 

cant use an internal pump for an external setup.. get a walbro or msd efi pump for this blowthrough setup.. use a mallory #4309 fuel pressure regulator
dril and tap the intake manifold for the oil injection

 

Bummer. It's okay though. I'll simply return it tomorrow go shopping for an external. Thanks Robert.