what is the best bang for your buck fuel injection? i have looked at holley, edelbrock, F.A.S.T., Accel, electromotive... i am looking for tunability as i am planning to add a supercharger to my motor later.

i definately want closed loop operation, and support of a wide band o2 sensor. what do you guys think? what are your experiences with each? i would be willing to save a little longer if the advantages are significant.

would like to get this ordered soon though since i got my motor back from the machine shop today, and my heads are due in tomorrow. i also will have y test stand completed over the weekend.

Amazing how antsy you get when things are almost done after two years of saving.


i have a 383 sb

9.5 compression
288xr comp cam
AFR 195 heads
1 3/4 super comps
2.5 in exhaust

if more info is needed let me know.

Fast, Big Stuff 3, and Accel all come with a wideband. I do not believe the Edelbrock will support a blower, but their new system may. The Holley will support a wideband but I believe that costs extra.

FAST is relatively simple to tune. Big Stuff 3 is a better faster unit made by the same guy and is $200. less. The Accel has a lot of nice features but is the most difficult of the three to tune. Holley is fairly easy to tune and has a great network of help.

Bottom line, I've used FAST in the past on several vehicles and always been happy. I have the Big Stuff 3 for my twin turbo as the resolution, processor speed, O2 speed, etc. is all better and at a lower price. Both of these do not come as complete kits so you'll need to purchase and manifold, rails, injectors, pump, filter, throttle body, etc. all separately. The Holley and Accel are available as kits and would be less money.

Jody

i can get an entire holley mpfi setup for 2150 plus freight from my machine shop. would it be possible down the road to upgrade the ecu when i put forced induction on the car??? i said a supercharger, but am still pondering a single turbo application for the car. i want fuel injection on the car but am limited to 2500 at the moment. i could skimp on the qa1's and suspension upgrades but think that with the motor i have i should be safe not sorry.

again thanks for the input.

chuck

i can get an entire holley mpfi setup for 2150 plus freight from my machine shop. would it be possible down the road to upgrade the ecu when i put forced induction on the car??? i said a supercharger, but am still pondering a single turbo application for the car. i want fuel injection on the car but am limited to 2500 at the moment. i could skimp on the qa1's and suspension upgrades but think that with the motor i have i should be safe not sorry.

again thanks for the input.

chuck

You could use it as-is, and upgrade to the wideband and larger injectors when you go to the blower/turbo. You might also see what kind of fuel pump upgrade they may have; an 800 HP turbo engine needs a lot more fuel than the standard pump in their kit puts out. It's just better to try to swap out these parts in the beginning if possible, rather than having to buy new stuff later on. Injectors are another area that if you knew what HP goal you were going for it may be possible to get the larger ones now so you don't end up buying two sets. It is for these reasons I usually go with piecing my own kits together; I end up swapping everything out of the kit!



Jody

I've used the Holley system and like it a lot. The kit is 100% complete and includes everything you need to make it run, along with instructions that any good wrench can follow. Tuning is easy and unserstandable.

Jody is very right about the fuel pump they supply, max is about 500hp and, at least 5 years ago, the supplied bosch external pump was less than reliable.

Wideband in an option, as is a positive pressure MAP sensor (for the blower)

Holley's tech support is great. I had a few occaisions to need them, and for one their head of r&d called me personally, and worked with me over the phone and via email until the problem was solved. Can't remember his name, but you'd recognize it if i did. With what you are considering doing, I'd suggest you call or email their tech people in advance, and get a dialog established. They'll tell it like it is, and they do know their stuff.

IMHO, the Commander 950 controller is an extremely capable unit, almost without limit. The rest of their "kit" systems are geared directly toward a do-it-yourself basic installation, and may need some changes for what you have in mind.

dont know much about this, but would running 36 or even 42 lb injectors now on my motor instead of 30lb cause me a problem. this is what would be necessary to cover my hp down the road.

chuck

I'm sure Jody will see this, and give you a "reality" answer rather than theory, but for now... There are limits as to how long or short the pulse width can be. Injectors too big will make the car fat during conditions that demand little fuel because even the shortest possible pulse still provides too much. On the other end, if the injector can't deliver enuf fuel with the longest pulse the computer can provide, you lean out on the top end.

Best guess is the 36's would be ok, but not the 42's. Second best guess is that a 400 HP motor and a 1000 hp motor flat will not run with the same size injectors ever.

There's a limit for sure but I've had 95# injectors that idled perfectly, and have seen turbo cars with a smooth idle and 160# injectors. Low impedance injectors seem to handle this a bit better.

Holleys system has a trick feature that can make big injectors idle well. I do not know how it is done but the mapping allows a large injector to work even easier than normal. Depending on your HP goal you may or may not be able to use one size for both.

Jody

probably not, but am not planning on the turbo or supercharger for at least a year. i am planning to make about 500 hp with this motor without it. i think that i may go ahead and get the 36lb injectors though. is the 2150 a good price for the system??? has anyone seen this cheaper anywhere?

chuck

500 fw or rw?
36 should be fine n/a

an injector constant is needed for the computer to determine how long to hold the pintle open, etc
so no matter how big an injector you put in you can make it idle and run
smaller on the other hand just locks the injector up

lmao


fyi: running 42 svo's in my 396 LT4 (non boosted) and in the 500 rwhp neighborhood

edit: personally and from what I've seen I'd go f.a.s.t. or dfi 7
no offense to the holley setup as it looks good, but know others using the other 2 (and some like motec but that big $)

example - 9.3 second 388 LT1 using dfi (latest gm high tech performance mag)