WHAT IS THE BEST LS INTAKE UNDER BOOST? SINGLE PLANE vs DUAL PLANE BLOW-THROUGH DISTRIBUTION TEST!
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- Опубликовано: 5 окт 2023
- DANGER!!! SHOULD YOU TRUST YOUR AIR/FUEL METER? SINGLE PLANE VS DUAL PLANE, WHICH CARBURETED LS INTAKE MANIFOLD WORKS BEST UNDER BOOST? CAN I RUN A BLOW-THROUGH CARB WITH A TURBO? HOW DO I RUN A CARBURETOR ON MY LS? WHICH INTAKE MANIFOLD HAS THE BEST AF DISTRIBUTION UNDER BOOST? IS MY AIR/FUEL METER REALLY ACCURATE? CHECK OUT PART 2 OF THE TESTING ON AIR/FUEL DISTRIBUTION BETWEEN A SINGLE PLANE AND DUAL PLANE INTAKE UNDER BOOST. WHAT HAPPENS WHEN YOU ADD A BLOW-THROUGH CARB? JUST BECAUSE YOUR AIR/FUEL METER SAYS THE TUNE IS OKAY, DOES THAT AVERAGE READING TELL YOU WHAT IS HAPPENING IN EVERY CYLINDER?
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Thanks for your time and help ❤
Awesome video! Thank you so much for the info
Fantastic content! Thanks Richard! Please do this for other manifolds/engines! Is the K24 content coming back?
I also would like to see some different fuel injected intake manifolds individual cylinder AFR under boost.
I would love to see this test with some common LS fuel injected intakes. Some stock ones and Holley Hiram, proflo etc. great info!
I just wanna know what cyl to rich up and how much : Amazon fauxgan with matching 102mm
Thank you for your knowledge and video's USA 🇺🇸
Makes me curious what the afr's would be in each individual cylinder with an injector feeding each cylinder vs. a carburetor feeding all 8.
Like is there something else going on in the combustion chamber or mixture that is causing the variance
please watch the carb vs efi video where i tested that
@@richardholdener1727 Have you ever done a tunnel ram turbo/twin turbo test?
Provided I didn’t misunderstand the results on the single plane, all the lean cylinders were the outer ones with longer runners. (1,2,7 and 8)
Is it merely a function of less overall flow through the longer four runners, or is it also that being wet flow due to a carburetor, that the air is traveling fine but the fuel (being heavier) isn’t making it as equally to those cylinders??
Thanks for all your awesome tests Richard. 👍🏼
Port injection comparison pls
that video is up
Sequential Port EFI it's one of the best things that have happened to the I.C.E, right up there with turbos, superchargers, intercoolers and coil on plug electronic ignition with no moving parts.
You'll never get close to it's precise fuel delivery under all conditions using a "Carbonator".😝
Richard, I am running a holley TBI setup on my gen3 5.3 LS. Which intake should I use?
Why did the DP crossover shift 200 RPMs? What would happen to the other cylinders a/f, if you optimize the a/f for the lean cylinder?
Did you do this on short runner efi like fauxgan or high ram? I saw the 6.0 test with long runner… what cyl should I add to? How much%?
Here my big question
I wonder if the sniper fuel injection replacement thing for carbs would do the same thing 14:06
Would love to see this test with individual injector trims and how well they adj7st the fuel curves
watch the EFI vs Carb video where I did just that
I wonder about the dual carburetor setups get betting fuel into the further cylinders and have more even AFRs?
Does all of us think about how we port an intake.a intake manifold?
How do you fix it
Great data, Richard. One advantage to EFI - cylinder skews, but of course you give up cooling.
Richard, would you say these disparities are based on individual runner CFM differences? Or just fluid distribution?
it is more than just absolute flow
@@richardholdener1727 thanks for the observations, much obliged.
I'd love to hear your thoughts on why this is happening inside the intake. I wish you would have added a 2" spacer to see if plenum volume helped. Maybe some kind of screen to create turbulence?
He’s shown on other tests that plenum volume changes rarely make any difference, it’s mostly about runner length.
I would like see how spacers affect afrs cylinder to cylinder.
Richard please🙏 test the one and only TunnelRam💪intake!
Hi Ram?
@@richardholdener1727 Hi! I thought about Dart or Weiand, but they maybe not make those for LS-engine?
Should have done 10 o2 so you could see what those 4 ended up being presumably its just an average but it would be interesting
Should have done 72 of them.
@james10739 I agree.
If you can see all 8 ya don't need 10...no reason too
we ran 9-but swapped from side to side...so 10
Thank you for doing videos like this, it would be amazing if you could show a N/A test like this with the Holley HiRam and dual quad carb set up. How much can be gained on a dual 4150 HiRam LS. Both carbs jetted square VS both carbs jetted to each cylinder?? If you have already done this test I'd love to watch/read about it.
please see the hi ram efi vs carb video
Thank You, you always peak my interest
I know there are single plane port injected manifolds, but do not know of any dual plane port injected ones. Is the distribution better for the single plane vs a dual plane manifold while using port injection? With the test you just did with the carb, I wonder if they had a dual plane manifold with port injection if the torque curve would be better than the single plane offerings or is there a major downside using port injection on a dual plane manifold.
distribution is not better on the single plane, even with port injection
So if you were doing this in efi you could tune individual cylinders right? Also would there be extra power to be found tightening up the air fuel or is it just safer for the engine?
Yes with a lot of aftermarket ecu, with Holley on a ls I always enrich the back cylinders on a ls motor , I don’t have 8 o2 sensors but I read the plugs for heat and afr . Like if I’m commanding 12.5 afr I’ll make a pull pull all the plugs and see if like cylinder 7 compares to cylinder 5 as far as color of the plug. I can get close but always pick up power that way especially on nitrous
Wouldn't these discrepancies show up in the exhaust gas temperature sensors?
maybe i missed it, but did you try moving the carb bonnet 90* and see the change? or 180 for that matter.
it wants to be straight inline
Good info! I’m wondering who decided on that cam, IC seems way too late to me for a 4.8. The wide LSA gives you serious negative overlap which you don’t really need when there’s not much mid range torque. The results of the collector AFR vs the individual cylinders is very enlightening, though, especially when you show variation tightening under boost-a very good thing! Someone else suggested port EFI, I second that. It would be good to use a four-hole throttle body in place of the carb, but an elbow and a single throttle body would be just as good. The results would show how well the manifolds deliver air to each cylinder, since presumably the fuel would be identical to each cylinder. Great video, let’s have more Richard!
He has a test on that, it varied also
#wrongcam.....again!
I swapped my 4.8 for a built 6.0 and a bigger turbo. Same turbo kit and wastegate but now instead of seeing 7psi as before, I only see 4psi. Is there something wrong? I thought the same waste spring would net the same boost? More back pressure?
more back pressure will open the gate early if you don't have something holding it closed (controller)
@@richardholdener1727 thanks for the reply. Yes, at the moment I'm just on the wastegaste spring
Quick question about O2 sensors and turbos- can modern O2 sensors survive the pressure in a turbo manifold? Will they read accurately?
most do not run o2 sensor pre turbo
.@@richardholdener1727 We tried years ago on the dyno, but they couldn't take it, but that was circa 2008. I was wondering if they now made some that could take it at least on dyno. could be an expensive experiment, but maybe you could put a turbo on that 4.8 and see what happens (at least at low boost)
@@richardholdener1727… Gotta love those trick questions 🤷♂️
Hey richard have you ever had some experience with the ford 4.0 SOHC? I like to build an odd ball motor and gap some angry V8 guys.
I have not
If all cylinder a/f is right power up or not chenge?
HP didn't change much when I did individual cylinder trims in the other video
I’d like to see the same test done with the holly hi-ram & sequential EFI (no individual cylinder compensation) and then also with the Tick Performance air-water intercooler sandwiched in the intake.👍🏻
Could an expert spark plug reader tell the difference in cylinders?
they could see rich or lean-but not how rich or how lean
Does fuel distribution matter at all if you are running Propane fuel???
I have no idea.
yes
That settles it. I don't intend to EVER use a carburetor. Too little precision, with a huge difference from one cylinder to the next in A/F ratio. I guess with one carb throat isolated to each cylinder, it may work, but, meh. EFI FTW!
Exactly!! Using a carb on a LS motor kinda defeats the purpose of using a LS motor.. it’s not 1970 anymore
That torque was real flat NA it was weird it didn't really even start falling off
Small engine wide lsa.
This is scary for your typical DIY car guy who has to rely on street tuning or a chassis dyno tune at best and obviously can't run 8 widebands.
weld in bugs to each cylinder and move your 1 sensor-make multiple runs and compare
@@richardholdener1727 That's a good idea. Sounds like in a forced induction application it's almost necessary.
i'm just too ignorant to understand half of this. Just make a spreadsheet with all the common engines and setups so we can just pick the best intake lol
Start with a Healthy NA engine
you are selling yourself short-you do understand rich vs lean
WHY ARE YOU AVOIDING doing a Ford Godzilla engines in pickup trucks tired of redone videos
Because no really cares about the Godzilla motor.
He’s not avoiding it, you just don’t find 7.3s in junkyards lol he’s said a gazillion times that he doesn’t have Godzilla crate money lol
I am Avoiding paying for the high price of a Godzilla
@@richardholdener1727… With your highly prestigious automotive credentials combined with the thousands of people that follow your videos, the positive publicity generated by your superb testing techniques would surely generate tons of positive publicity for Ford and their Godzilla engine. It would be advantageous for Ford to donate an engine to you. It’s a worthwhile endeavor. Have you tried asking them ?
It’s still my opinion that CLEVELANDS RULE. Other opinions will surely vary 🏁🇺🇸.