I put the atomic msd efi on my 87 cutlass and I love it ....was very easy to install and immediate idle and throtle responce was very noticeable....have a brand new one for sale if interested...
Was noticeable over what, the stock CCC Qjet or other carb? Was the carb tuned properly?
I'm not trying to bust your balls, it's an honest question. I was just curious since many people who swap certain parts on and rave about how much better they are sometimes fail to mention their original parts were crap to begin with. As far as bolt on EFI's go, it would be nice to hear an honest ( aka not a salesman who sells EFI units ) opinion on what one of these units is truly capable of doing vs a properly set up carb.
I have not personally used FAST so my opinion may not be valid. But, if you look at the design (injectors directly below the throttle plates) and compare it to factory GM TBI (injectors just above the throttle plates), there isn't a whole lot of functional difference. I have installed and used a couple Holley ProJection systems which is essentially an adjustable, stand-alone GM TBI system. I found the ProJection to be better overall than the poorly running carbs that they replaced. Not sure they would have been much better than a GOOD carb in proper state of tune. The most noticeable advantages/improvements were mpg and the fact that there were no more choke issues -- just hit the key and go.
IMO, a good carb will run as well as a TBI system. But neither can compete with a traditional EFI system having an injector at the valve end of each runner. The FAST, MSD, and Holley are all fine but pretty expensive for not much gain. To me they are more of a gimmick. Not at all bad -- just not really better.
Agree. Are you controlling the timing with a MSD box? I wonder why they design some the systems without timing control? Especially since most do the sbc swap, big and small cap computer controlled distributors are out there by the thousands. Heck even Pontiac and Olds have the big cap style. That is what I used. Of course if the timing has set parameters like the stock TBI sbc computer, you need 20+ initial to get anywhere near enough on a moderate compression Olds V8.
I do use the Atomic EFI at work. They are nice setup. You dont need a fuel return. And its easiest to hook up without the computer controlling the timing. Ive heard guys have alot of trouble with them.
If I were to put one on now it would be hard for me to decide which one. But overall I love the Fast EFI
:lol: ^^^Actual useful information!^^^
That's way better than my, "I've used similar products" speech. Glad to hear both systems work well. Out of curiosity, did you ever run a carb before the FAST system or was it on there from the start? If so, how did it compare/differ?
:lol: ^^^Actual useful information!^^^
That's way better than my, "I've used similar products" speech. Glad to hear both systems work well. Out of curiosity, did you ever run a carb before the FAST system or was it on there from the start? If so, how did it compare/differ?
I had a quick fuel 850 on it. It ran good with that and had plenty of power. But I drive 100miles round trip and got 10mpg on it, that was with driving it easy. As soon as I went to the FAST i average 12-13mpg with driving like an *ss hole. I once saw 13.8mpg as I was trying to get the best overall.
Its easy to tune, I had a slight stumble at cruising speed when I would give it some gas. So while driving I changed the fuel enrichment(i believe) which is like a pump squirt on a holley. and It went away. They it got even snappier off the line.
Throttle response in incredible. I can be rolling at 5-10mph in first and punch it to the floor. I cant even shift fast enough before it hits the limiter at 6200.
I do use the Atomic EFI at work. They are nice setup. You dont need a fuel return. And its easiest to hook up without the computer controlling the timing. Ive heard guys have alot of trouble with them.
If I were to put one on now it would be hard for me to decide which one. But overall I love the Fast EFI
Can you clear some of this up because I'm confused. You say you love the FAST but you use the Atomic 'at work'. Not sure what you mean by that. Also, what are you saying guys are having alot of trouble with? Setting up the timing? What problems are they having?
Also, from what I've read, the Atomic's 'no return line needed' setup is extremely limiting as it doesn't work well when the temp is hot outside and lets be honest, we drive our cars ( sometimes exclusively ) in the summer when it's hot! If that's true, then I don't see that as being a practical way of running it. Can anyone with EXPERIENCE running the Atomic in 'severe' summer heat refute this?
Also, what advantage do you feel the FAST has over the Atomic?
When I put the Fast on my car there was no such thing as the Atomic Efi. So that's what I had to use. We install the atomic for customers because of the no return. They say over this horsepower, this climate condition, yada yada yada that a return is needed. We have never needed one on any engine in anywhere in the country. I've put this on a 600hp Chevy 427 smallblock going to Canada and it runs perfect.
The atomic is capable to adjust its own timing. For that you need a mag distributor($300+), which they don't tell you until after you buy it and read the instructions, then you have to essentially take the guts out phase the rotor and wire it to the efi system. People have issues with that. But if you use a regular distributor it runs great.
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