Factory Five Racing Forum banner

1 - 20 of 40 Posts

·
Charter Member
Joined
·
644 Posts
Discussion Starter #1
Interested to know what route most guys took.

I’ve been a fan of FI since my first build and all since have been.

I’ve had a few issues with this particular setup and i believe it’s in need of a custom tune to sort out. I love FI for its cold starts and being more economical as far as fuel burn.

I can’t help but think that for the few miles I drive this car I could swap to a carb and sell off my FI parts and be money to the good.

I do know that a good carb setup isn’t all that temperamental anymore.

Motor is a 347 T5. Has all the usual top end upgrades. Whole top end and cam done by Ed Curtis at FTI. Car runs incredibly well just has a few idle issues and hot start issues. Car has been together for 13k miles.

Just curious
 

·
1st RFM/FFR Legacy Winner
Joined
·
21,369 Posts
I have a carb but if I did it now, I would go with carb look EFI.

Greg
 

·
Registered
Joined
·
1,334 Posts
Carb - 302 (Edelbrock Performer RPM heads with 2.02 intake valves + Edelbrock Performer RPM intake and a Ford "F" Cam)

I have a couple of carburetors. Both are 600cfm with one being the Edelbrock and the other a Holley double pumper. I converted both to electric choke. The Edelbrock was pure plug and play with my engine. Bolt it on, adjust the idle and the mixture and it simply worked. I bought the Holley DP to see if it would make more power (and yes, it sure seems to). The Holley was a little more finicky to get dialed in simply because it offers a wealth of tuning options. Of course the idle/mixture needs to be set but Holley has a wide range of options to adjust the accelerator pump. I had a hesitation at idle because the primary pump wasn't dumping enough fuel to compensate for the sudden loss of vacuum as the butterflies opened. I was able to tune this out by changing the pump cam (easy) to the "green" version and increasing my shooter size (easy but a little nerve racking to do on the car) by 1 step. The Holley now runs great.

The point is that getting a carb dialed in isn't too hard. It might just drop in and work or, it might need a little "massaging" to get it dialed in but once set, you shouldn't have many issues.

I was intrigued by EFI but couldn't justify the cost and the hassle of finding someone to weld the O2 bungs into my exhaust.

No regrets at all. In fact, I am very happy with both carb's. I tend to use the Holley for playing around on the streets but it burns through a tank of gas faster than the Edelbrock so I switch them out when I am planning to do a lot of highway driving.

I should add that both carb's require two pumps of the gas pedal before I turn it over but both will start instantly in hot and cold weather.
 

·
Buck
Joined
·
288 Posts
Not sure how old your EFI is but finding a buyer for a used, and possibly outdated EFI system might be a little tough. Too many pluses for EFI to go back to carb. Just my opinion.

Buck
 

·
FFCobra Craftsman
Joined
·
22,115 Posts
I have been carb since 2007. Bought my current QF about 2012. I spent a ton of time getting it tuned properly. I learned a LOT and really enjoyed the process. Enjoyed the minor changes needed when I went 351 to 408. But it was a lot of work and I have worked on cars all my life w/ the last 25 yrs as a Lexus line tech. So a carb is not likely to be a bolt it on and go situation. If I were needing a carb now, I'd also go carb look efi. When I was buying, the carb was approx $650 and MassFlo efi was approx $2000 so it was no contest. Now w/ efi approx $1000 and the carb $688, the efi would be no contest.
 

·
Registered
Joined
·
369 Posts
Interested to know what route most guys took.

I’ve been a fan of FI since my first build and all since have been.

I’ve had a few issues with this particular setup and i believe it’s in need of a custom tune to sort out. I love FI for its cold starts and being more economical as far as fuel burn.

I can’t help but think that for the few miles I drive this car I could swap to a carb and sell off my FI parts and be money to the good.

I do know that a good carb setup isn’t all that temperamental anymore.

Motor is a 347 T5. Has all the usual top end upgrades. Whole top end and cam done by Ed Curtis at FTI. Car runs incredibly well just has a few idle issues and hot start issues. Car has been together for 13k miles.

Just curious
What's the details of your setup? Or did I miss it? :confused1:
 

·
Charter Member
Joined
·
644 Posts
Discussion Starter #9
347 with eddy performer rpm heads and intake. All ported and custom cam ground for the setup. All done by Ed Curtis at fti.

80mm accufab Tb and 75mm prom Meter. 30lb red tops and A9L.
 

·
Well Used Member
Joined
·
220 Posts
Old school car. Old school motor. Old school Carburetor. Old school body. Old school brain.
 

·
Senior Charter Member
Joined
·
6,290 Posts
So...Me Too...

I had a carb on my first build, a 390, and liked it quite well. It didn't seem to need too much attention for normal use on local runs. I could tell when I went to higher elevations that it was in need of adjustment but as I was just visiting I didn't do any.

When I built my FFR I decided to go with FI and used the donor set-up, '88 Mustang 5.0 HO. I really like the convenience of this set-up, as well as the increased mileage (16 on the carb'd 390 and 25 on the FI 302).

As I get closer to finishing my '67 Cougar, I'm leaning to the "carb look" for the same convenience. I will get it running with the stock Holly carb and switch to FI later on (I did add the O2 ports when I welded up the exhaust system).

Regards.
 

·
Registered
Joined
·
616 Posts
I started with a Powerjection system. Worked ok, not great. I was reading about other options when the ECU in it died. Switched to the FiTech. Major improvement in drivability. Sea level to the mountains, works really well.

John
 

·
Registered
Joined
·
1,015 Posts
I had a 351w with a QF680. She ran fine and “cold starts” we’re not a big issue to me. I would roll her out of the garage, pump the pedal three times and she would fire up. I would then sit for a few minutes to get her settled and off I would go. I liked sitting in her for that time as I would get the chance to to admire her, listen for any possible issues and it was one of the few times I was not rushing to get some where. I miss her so...
 

·
Charter Member
Joined
·
1,604 Posts
I'm running a 289 Hi-Po with an original dual quad Carter set up. They run just great and I love the look.



John O
 

·
Registered
Joined
·
92 Posts
I've got 347 stroker with Holly 750 double pumper carb. Call me old school, but that's how the cars were made originally. I do it all over again - (it's fun to tinker)
 

·
Registered
Joined
·
24 Posts
I'm an old school guy who grew up with carburetors. I've rebuilt those things so many times I can probably do it in my sleep. Through the years I've tuned, swapped, adjusted, modified, etc. and etc. I know carburetors like the back of my hand. And that is why I like EFI.

I'm too old and grouchy to argue with a carburetor anymore. It's like going back to an ex-girlfriend who's as fun and hot as she can be, but temperamental as hell and often a bit "off." You remember the good, but forget about the work and effort to deal with her. Next thing you know, she's got all your money while you're broke a$# is standing on the side of the road with a thumb stuck out.

I kinda approach it like this. The original concept (as I understand it) was to take an AC roadster and modify it for a specific purpose. Shelby pretty much gutted the mechanics, built it with a focused application in mind and installed bigger, better, stronger, faster and more modern (at the time) components. He did the same thing with Mustangs, Dodges and tried with the Corvette before those.

So I consider What Would Shelby Do Now (WWSDN) in keeping the shape mostly original with the intent of a street legal race car using technology available today. Blowers? Engines/HP/Torque? Computers? Traction control? Brakes? Transmission? Clutches? Materials? Would his cars be aluminum? Fiberglass? Carbon Fibre? Would he use titanium frames? Would they have a spoiler? Air dam? Windshields that don't crack? Ground effect skirts? What ignition? What seats?

The idea of a car that is not dependent on electronics is extremely attractive. But there's more cost and extra work to have it. Just like there's extra cost, maintenance and aggravation with a crazy ex-girlfriend.
 

·
Registered
Joined
·
91 Posts
For you die hard carb guys. I ran across this the other day.

https://www.knfilters.com/eci
This looks interesting, but I suspect it might be one of those ideas that works better on paper than it does it real world. They claim you just tap into the existing fuel line but I don't see how it will generate the pressure necessary to atomize thru the injector. Will be interesting to hear some reviews.
 

·
Too Cheap to paint!
Joined
·
6,130 Posts
I too ws a dyed in the wool carb guy for decades. Took the plunge with the FITECH system. Ran into problems and system issues, but worked through it and got it running better than my carb ever did. I like the easy start and better drivability of the EFI, but like things simpler. With tools, you can always get a barb home. FI not.

Will have to see how FI tames my new motor, but staying FI.

One thing I learned, FI is NOT a bolt-on. Will have initial issues. Do research, and properly set up and equip your car
 

·
Registered
Joined
·
6 Posts
Funny, the last Car I had that was carbed was my old CR 427. Since then, I've been involved with Megasquirt from the first group buy, I've only used EFI. I am just starting to build a MK-IV roadster and I have yet to ship the Engine to Thailand. In a few months it will be here with the car and all my tools, then I can get the harness built and connected to the MS3-pro ECU. It will be running ITB's from Pro comp setup for flex fuel, since E85 is plentiful here in Thailand.
 
1 - 20 of 40 Posts
Top