Tuning the Carburetors On The Supercharged Tide Car
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- Опубліковано 1 жов 2024
- In this video, I tune the carburetors on the weiand supercharger, or attempt to, anyway.
The carburetor I had on the engine before the blower, I have come to find out, is a 500 CFM carb. That wouldn't do with the 650 on the front. So I bought another AVS2 for the rear of the roots blower.
Both carbs come stock with:
6" Hg step up springs (orange)
0.101 primary jets
0.098 secondary jets
and 0.070 x 0.037 metering rods
I had a really tough time tuning out the lean condition just off idle and cruise. I went with the heaviest step-up spring I could, which was 8" I kind of wish they had 10" springs. That was the biggest positive change in the car was swapping those springs.
I also put 0.101 jets in the secondaries which brought the AFR down to about 12/1 at wide open throttle. I'm seriously considering putting 0.073 x 0.037 metering rods with 0.104 jets in the primary. I will probably try that after I drive the car around a bit more and see how it does.
The floats were about 10-20% off from the factory, which is within reason. It's pretty difficult to get them perfect. I can't imagine being the guy who just sets floats all day at the Edelbrock factory!
All in all, I had fun tuning the carbs. Still have a lot to learn.
Thank you so much for watching!
I Hope you are enjoying the videos, and if you are, SUBSCRIBE!
Check out my Instagram as well:
/ rightturnrandy
Congrats man! It's fantastic that you understand how all this works and know what to do to work the bugs out. 👏
I'd step up one jet size and go with one spring lighter than the heavyest might clear up part throttle opp
Are you using boost reference power valves?
There are no power valves on these carburetors. And with this setup, you don't have to have a boost reference for anything.
definitely use of a vac gauge would aid a bunch in tuneing
You never even pulled a spark plug to see how it is really burning the fuel. If you ran it too lean to long there will be aluminum particles in the spark plug...UM NOT GOOD...
a roots blower will have a stronger vacuum signal than a NA engine.
So many people say that, but I haven't noticed the difference. I don't see, in terms of physics, how it would be any different, under the carbs, that a larger displacement engine.
@@RightTurnRandy It is different in effecting power valve/vacuum metering rods, The blower pulls air harder than pistons do, even at idle.
Very nice set up. I am curious on your throttle linkage set up. Any part numbers or info would be greatly appreciated. Keep up the great information
I got the linkage kit from Summit. Was like $14. The pedal is a lever design. It came with the car. It attaches via bent aluminum brake line and assorted fittings to the linkage.
Love it! Are you going to be at Cleetus and Cars Indy this year? Karla and I probably won't make it, it looks like we'll be doing something else.
I missed the fun run registration before it sold out, but I did enter the burnout competition so I can at least have my car in the pits like last year. I have to be approved for that though, so I may or may not be there with the car.
@@RightTurnRandy If we do wind up going, we'll be on the lookout for you!
Great vlog randy good to see that big smile on your face pal all the hard work paying off the car sounds great as you say the carbs can be a nightmare to setup looking forward to the next vlog
Wait wait wait. You are using an AVS2 carburetor with a supercharger? I just want a clear answer before I memorize this video. I was told you had to get a blow through carburetor for a supercharger.
For a turbo, you would need a blow through carburetor since it pressurizes the entire airstream. All a supercharger does is draw more air than the engine would normally. The only issue I've had so far is the normal step up springs aren't quite strong enough to quickly lift the needles upon off idle acceleration. Yes, they are AVS2 carburetors and they work great. If I got the right step up springs and tuned the air valves properly they would be perfect.
Alright, I'm no fan of NASCAR, but this is kinda cool. Properly, seriously cool. If I was asked to do a project like this, I'd do it on a Lumina NASCAR with a paintjob that wasn't as recognizable (Or preferebly, just plain jane white). Then I'd drop a 366 cubic inch V8 in there and repaint it to resemble the "Rainbow Warrior" Jeff Gordon (Along with a printed image of Jessica Rabbit and one of those JBL Speakers, so I can show up playing White Zombie or some thing to that effect).
Don’t hurt the car need to go to museum
Randy, what ratio are you running on the blower? Top Pulley teeth = ? Bottom pulley teeth = ?. I just picked up my blower and I want to get some feedback on amount over\under drive on your small block.
It has a 38 up top and I believe a 34 on the crank. Works out to something like 15% under drive. Or maybe 12%, can't remember.
Did you tighten the secondary air door springs? . That's your lean out problem.
I haven't started messing with the air valve secondary. I will eventually but I'm rebuilding another car right now.
You need to put a vacuum gauge next to your A/F gauge. That way you can see the exact correlation of A/F changes and 'load' at the base of the carbs
And you'll be able to see exactly when the metering events take place.
Would be good info to have. I do know that both carbs are at 20" at idle 😆😆
@@RightTurnRandy Vacuum gauges are VERY underrated tuning tools.
I think they were old school when my grandfather was hotrodding.
These carbs worked right out of the box with no modifications for a draw through/ supercharger setup?
Yessir. Changed needles, jets, and springs since. It fired up with both carbs straight from the box though.
I think if you change the title wording and repost this video and attract those tuners out there from all regions.
You think so?
What title would you use?
Sounds mean, mate! Great job!
If you change de Power Valve sinal, like people do in Holley carbs, maybe you a better ajustment from the Springs? Sorry my english is terrible...... Hugs from Brasil!!!
Thank you for the suggestion!
Edelbrock carburetors do not have power valves. I can find custom springs if I really need them. The car is running very well at the moment.
@@RightTurnRandy but the metering rods had a vacuum signal Just like a Power Valve in the Holley, change This signal can be better? That what I mean, again Sorry my terrible english, and you car really looks awesome!!
@@vitorcruz9586 Thank you so much. I can't adjust the amount of vacuum the springs see without modifying the Carburetor body. I'm not confident enough to engineer something like that.
What you are suggesting is a very good idea. To reduce overall vacuum for just the springs would be an excellent solution. I don't believe it can be done easily.
Your English is quite good.
@@RightTurnRandy I have a plan to change This vaccum signal, a carb spacer with holes and a hose conecting in the intake, that way you don t need to change anything in the carburetor, Just isolating the vaccum signal between carburetor and blower!! I never try This, but in theory is perfect, in the Future I in tend to blown my Brazilian version of the Ford galaxie 500, with 302 small block Ford and edelbrock avs2 carb, Just like you!! But supercharging an v8 in Brazil is not easy and accessible like in USA.... Unfortunetly
How did you hook up that wideband for two carbs and the blower....Thanks
Simply plugged the sensor into the driver side bank exhaust collector and wired it up as normal. Works great!
Thank You
Edelbrock carbs... 🤢🤮
Best street carbs on the market. You can have that 7hp@6,000rpm. I'll keep changing jets without getting fuel everywhere.
What blower is that and is it one of the whiniest noisy blowers ?
It's a Weiand 6-71. There's a video of the whole install. Everything done to this car is on the channel.
It's not super noisy. Some guys have timing gear sets that are gear driven, super noisy. You can hear the supercharger, but it's not grating and certainly not louder than the exhaust. I personally love how it sounds.
@@RightTurnRandy ya , I have a Pete Jackson gear drive in my 64 el camino sbc , but am thinking of building a low budget 350 with a blower and love that whiney noise , thanks for the quick response and kool car you have there.
You need to change the vacuum port on the manifold down and block the carburetor vacuum on the throttle Platte
To what end? I haven't had any issues at all. Car's running perfectly right now.
@@RightTurnRandy seems to run a bit lean at the moment you step on the gas, the supercharger produce too much vacuum when you accelerate.. search vor boost reference modifications on your carb..
@@the350v8 Carter style carbs don't need that. The lean spot is a combination of the secondary air valves not opening at the right time and the step up springs being too soft. I could tune it out, but it's gonna be a lot of work for that little hiccup. I probably will eventually.
@@RightTurnRandy anyway, absolutely great work...
@@the350v8 Thanks! I appreciate that. Thanks for weighing in. I appreciate the input. I learn a lot from people commenting.
Sweet build love the car
Thanks!
Don’t you do it
nope. you need to boost reference the carbs.
No. I don't.
you deserve more views dude!
Thanks, man! I appreciate that.