Search found 120 matches

by keys2pines
Thu May 02, 2019 9:14 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

A lot of user data in sites like this one. Guys who experienced lean conditions on certain cylinders using a dual plane, map issues and fuel degradation to seals etc. Something to think about maybe. http://cpgnation.com/forum/threads/ez-efi-2-0-injection-with-dual-plane-intake-vs-single-plane.25871...
by keys2pines
Wed May 01, 2019 6:35 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Carburetor required vacuum to draw and atomize fuel from a booster much like sucking from a straw. It needs a longer runner and velocity of air over the venturi. FI uses pump pressure and a injector to spray. When GM (Cadillac) tested and produced early manifold based FI they discovered the injecti...
by keys2pines
Wed May 01, 2019 7:30 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Reading through this thread has been interesting. There is a lot of old tech and info about EFI in here. worry about computers overheating, not being waterproof, failing components. Like we all forgot that we daily drive on efi in our cars for the last 30 years..Standalone computers arent much diff...
by keys2pines
Sat Apr 27, 2019 8:45 pm
Forum: Airboat Talk
Topic: Reflecting on Maiden Voyage
Replies: 17
Views: 2057

Re: Reflecting on Maiden Voyage

For the hard starting, upgrade to 0awg. Fixed my hard warm starts immediately, boat starts as soon as I push the button now.
by keys2pines
Fri Apr 26, 2019 7:20 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

GeeLeDouche wrote:I think I'm going to order the Fitech kit for my LS2 soon. Just debating which kit to order. Do you guys run the "Go EFI" kit or the "Ultimate" kit with a new intake manifold?
I got the go-efi, just the throttle body kit.
by keys2pines
Fri Apr 26, 2019 6:54 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

hdsadey wrote:Which brand did you order?
Same as yours, Fitech. I bought the 180 thermostat and in-tank pump also.
by keys2pines
Thu Apr 25, 2019 7:41 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Have you checked the float drop not float level? If the needle and seat are to far down then the float will never drop far enough to allow the correct amount fuel in. I had it happen when my fuel pressure regulator went bad and spiked the pressure to my carb. Just a possibility I didn't check that,...
by keys2pines
Wed Apr 24, 2019 3:57 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Welp, I changed the jets that were in there (62 mains and secondary metering plate 64) all the way up to 70 mains and 74 secondary, 74 was the highest I had. No change in AFR, or max prop speed. The power valve went bad while I was testing and my AFR went straight to 10.0. I verified the power valve...
by keys2pines
Wed Apr 24, 2019 7:40 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Yup, and my buddy has been racing cars since he was 18 and thought he knew it all.... go ahead w that efi let us know how that works out No offense, but if I thought I "knew it all" I wouldn't be here asking questions. As for the EFI, there is a reason new cars don't come with carbs. I'm positive i...
by keys2pines
Fri Apr 19, 2019 8:46 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Or... get with Ed MAck or another carb expert do it right and preserve the motor! I hear you, but I put my own engine together at 18 years old. I'm not a newbie by any means, I've just never messed with carbs or the rpms a direct drive airboat runs. I have a wideband and a dyno (prop rpm), I'll get...
by keys2pines
Thu Apr 18, 2019 9:30 pm
Forum: Automotive Power Only
Topic: 408 Ford stroker build underway! Direct drive
Replies: 140
Views: 18395

Re: 408 Ford stroker build underway! Direct drive

Thanks! I ended up digging more and found a metering plate conversion so I can put different jets in the secondary. I'm going to tune it best I can with the carb and run it for a while. I had a turbo LT1 camaro before so I'm honestly more comfortable with a laptop than a carb lol, but this boat is m...
by keys2pines
Thu Apr 18, 2019 9:24 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

I have put those kits on many of those carbs. Yea, I don't think this guy knows what he's talking about. I ended up finding a quick fuel metering plate that has provisions for jets and comes with a modified float to clear the jets. It was on the Holley website. I emailed the tech back and he said "...
by keys2pines
Thu Apr 18, 2019 7:30 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Can't you tune it for WOT and use a piece of Wire in the IFR ( old school trick) to lean it out at idle but will be a little fat at cruise. Depending on the metering plate you can also drill and tap IFR and emulsion circuit for 6/32 brass blanks and drill them to the size you need. Just some though...
by keys2pines
Wed Apr 17, 2019 10:03 pm
Forum: Automotive Power Only
Topic: 408 Ford stroker build underway! Direct drive
Replies: 140
Views: 18395

Re: 408 Ford stroker build underway! Direct drive

Awesome man! Thanks for the info. The carb that's on my boat now is not adjustable enough, and my wideband is telling me I'm lean at WOT and a little rich at cruise. Need more tunability, and spending $400-$600 on a new carb when I can go EFI for $1000 is a no-brainer.
by keys2pines
Wed Apr 17, 2019 6:44 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Heat range appears good. Can tell by the color change on the ground strap. Once you get used to reading plugs you will gain a lot of confidence in tuning your engine. I think you are on the right track. Thanks! I was confident when I had my turbo camaro, airboat has me second guessing myself becaus...
by keys2pines
Tue Apr 16, 2019 9:47 pm
Forum: Automotive Power Only
Topic: 408 Ford stroker build underway! Direct drive
Replies: 140
Views: 18395

Re: 408 Ford stroker build underway! Direct drive

How are you liking the Fitech? Are you using it to control timing? I'm thinking about converting mine with their system.
by keys2pines
Sat Apr 13, 2019 12:49 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

A spark plug magnifier is an inexpensive tool to have at the track. They are lighted and have a typical 10x magnification that allows you to look closely for the slightest bit of coloring on the insulator and to easily inspect heat patterns. https://www.speednik.com/files/2018/05/spark-plugs-perfor...
by keys2pines
Fri Apr 12, 2019 12:47 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

These are brand new plugs, I changed them after I let the engine warm up. Ran it up to max 2600rpm on the trailer for 10-15 seconds then shut it off. Too lean?
by keys2pines
Fri Apr 12, 2019 7:40 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Check your fire on these. That's a broad range of plug identifiers and could be a spark jump on the latter pictures. Unknown on a DD but i'm running 14.2 to 14.5 depending on climate overall. Haven't got into the low rpm factors so maybe new ground. I did have a set of D1 champions last 12 years if...
by keys2pines
Fri Apr 12, 2019 7:27 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

The coloring on the insulator tip only shows the AFR at idle. You have to use a magnify glass and look inside the plug to determine the AFR at 2400 RPMs. Also how many hours were on these plugs? Is there anyway you can run the boat on the trailer and look at the plugs? This will create a more contr...
by keys2pines
Thu Apr 11, 2019 5:24 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Well my advice would be to read the plugs. Mr. Branch who in my humble opinion is the King of Direct Drive Auto engines would say if your concerned about your full throttle fuel ratio run the boat hard and pull up on some dry and run hard again. Then from wide open let it go to idle and immediately...
by keys2pines
Fri Apr 05, 2019 7:29 am
Forum: Airboat Talk
Topic: 2019 Mack's fish camp ride and cookout
Replies: 20
Views: 2333

Re: 2019 Mack's fish camp ride and cookout

Looks like fun, wish we could have made it out!
by keys2pines
Thu Apr 04, 2019 10:01 pm
Forum: Florida Club Talk
Topic: Hollywood Park gator boys
Replies: 1
Views: 3691

Re: Hollywood Park gator boys

Yea great place to put in, I ride at Holiday a lot, lots of water so you don't have to worry about getting stuck.
by keys2pines
Mon Apr 01, 2019 11:14 pm
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

SWAMPHUNTER45 wrote:How do the plugs look?
Never checked them, figured the wideband was more accurate.
by keys2pines
Mon Apr 01, 2019 10:48 am
Forum: Automotive Power Only
Topic: Air fuel ratio for direct drive
Replies: 86
Views: 11968

Re: Air fuel ratio for direct drive

Get an air fuel ratio gauge, weld a bung in a header collector, and go that route, you might just gain a bit of power, and fuel efficiency once fine tuned. I did that already, I'm getting 13.6 AFR from idle to WOT. I was asking if that was a safe number at WOT, I'm used to being 12.5-13 at WOT when...

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