the eliminator is a better choice but the ouput still drops signifigantly at 75 psi,its what I'm running,but I also boost the voltage to 15-16 volts to make it put out more,I would have just bought the pro series but its not a constant duty pump and I was worried it would overheat or put out too much at idle,Smitty
http://www.aeromotiveinc.com/product...atsub=1&prod=2
go to specs to see its rating

Do it once, no cables, no boosters, no add on drivers, stock alternater. One ECU, one pump, one regulator, correct sized lines and injectors, DONE. Fast Ecu, weldon 2025 pump, weldon regulator, 72 lb injectors, 10 an lines, 100 micron pre filter, 10 micron filter before injectors. Have the dealer install a start and run program, finish tuning on the dyno and on the water. Most aftermarket ECU's have a wideband 02, you can set your a/f ratios,run data logs, and map your timing for what works best for your application. Any future changes you make to the engine can be accommodated with a laptop and a few key strokes.

If I was just first putting a blower on my motor and had to buy everything GPM'S parts list would definately be the way to go. Everyone knows what happens though,you buy a procharger kit,you install there mediocre support equipment. At first everythings seems o/k except the regulators are junk so you upgrade them. Next you buy a bigger fuel pump and pay someone to reprogram your mefi,then your so far into it starting over isn't feasible unless your really changing alot. The whole thing with boosting fuel pressure so much is just a band aid but it works good enough to run it. If I was starting with a clean slate though I wouldn't pizz around with any of the stuff I'm currently running,I'd just buy the good stuff,Smitty

"Dick,with your electrical experience you ought to design a "conversion box" that allows guys with mefi ecu's and cheap aftermarket fuel injection systems like the holley/accell to drive low impedance injectors. It would be interesting because there are quite a few guys like me who would be running bigger injectors but are limited to the 60/63 lb siemens that are available,Smitty"


Smitty, I am in the process of researching that at this moment. Circuit boards are being built by a guy in Canada as we speak.
Is the Mefi sequiental or batch fire? Does it have any idea what is on the driver output. If it can tell there is a load change on the injector output then that has to be dealt with. But this is doable.. small self contained Peak & Hold Driver box.
Dick

Accel sells a driver box, they've had it for years, they use it with their gen6 box because it wouldn't run big injectors on it's own.

I went to their web site, but couldnt find it.. too difficult to search.. Any idea what the number is on that box GPM? I would be interested in the price on it.

Dick

They were available at Summit and Jeg's a while ago, I beleive they were around 400.00. Check with Earl at Kinsler Fuel Injection. AEM makes one, part number, 30-2710, 349.85www.aempower.com/ViewCategory.aspx?CategoryID=83 AEM driver module on Ebay for under 300.

Mr Gadgets,
The MEFI batch fires.

They don't seem to have a problem running at 85% duty cycle.
The way around the injector problem is to run more of them. That is one reason I like Whipples so much. Besides the fact that they are bas a$$ blowers, a single 3.3 only holds 8, but a quadrotor holds up to 12. I run 10 until around 1400 hp, after that you need 12. Haven't had a problem with the driver crapping out from running 6 injectors each yet. If I run a roots or PSI, I make my own injector plate to sit on top of the blower and put as many injectors in it as needed. I have seen guys add injectors through the side of an intake ( under the carb pad on a blow through) and only turn them on while in boost in order to have enough fuel.
Eddie

I wish I would have known this 4 years ago,I would have converted my set-up to low impedance injectors,thanks for the info. I love these intense discussions,everyone learns something they didn't know before,Smitty

Thanks Eddie!! I like your idea!

Injectors
 

Smitty,
Were your Siemens 63 injectors a direct replacement or was modification required?
What part number did you use? I have a call in for Tyler and will speak with him in the AM
Bob

There was a mistake made when I ordered my 63 lb injectors,they were supposed to be almost identical in length to my stock ones,they turned out to be about 5/8" longer so I made a custom twin rail fuel injection set-up to make them work. I had started making a twin rail system for stock length injectors and it just wasn't going to work due to the rails hitting the intake ports so it all turned out for the better anyways,Smitty

The rail in the right pic in the above post was the first one I started making,I had whittled and milled it to death and it still wasn't going to work,the ones that I ended up making were a much cleaner set-up that wouldn't have been possible with stock length injectors. At 800 hp buy the stock length injectors and use your stock fuel rail,the twin rail set-up would be a waste of time,Smitty

http://www.fjoracing.com/products/injdrvr/

I've used this one with the mefi controllers. It worked GREAT :)

Smitty, I rember discussing this with you I guess the better question was is there a direct replacement with little modification? Your setup does look great though.
Bob

I am in the process of building a 502 MPI with an M3 (now a 540 with alum. heads). I needed more than the stock 42 lb Keihin injectors. This is a 98 model engine with v belts and a MEFI 1. The newer engines with a serpentine and MEFI 3 has different injectors, so what I did may or may not work for everyone. I was able to drill both the manifold and rail to accept Siemens 63 lb injectors. No one makes a larger injector to replace the stock Keihin's. I contemplated making new rails, but I decided to try this first and it worked out great. Once I figured it out, it is actually pretty easy to do with an injector bit. I'll post some pics later if someone is interested.
Carl,
Why didn't you tell me about that injector controller before now??????:D
Eddie

When it comes to EFI fuel pumps I am kind of curious why more people don't use the Weldon pumps, I've been told they pump considerably better than Aeromotive or others.
Whats the opinion here? Anybody else got input on the Weldon pumps? thanks

Ray @ Raylar

Weldon makes great pumps AND higher capacity than Aeromotive. I never want to be "on the edge" of an electric pump. ~1200hp+ it's time to put a mechanical fuel pump on the back of the dry sump pump. :)

Ray,
I don't use the Weldon's on anything under 900 hp just because of the cost and that there are many other pumps that can get the job done. Over 900 hp, I would not use anything except a Weldon. Have only had one Weldon pump fail. Merc uses them also.
Eddie

Looks like the price is only 191$ if I interpreted the part# and price sheet correctly,I would have went with bigger yet injectors if I had know of these low impedance drivers a few years ago,Smitty

Smitty,
I spoke with Tyler today. I'm shipping my rail to him to fit the injectors and we are working out dyno time. Thanks again.
Bob