Question for the FAST guys (9-secs or better)N/A

[joelster]

Do any of you guys have any real data of a back-to-back comparison between a single-plane/elbow intake setup, versus a single-plane with a 4bbl TB setup? My next build will be turning some higher rpm and feeding some more cubes, and i'm thinking that the elbow MAY become a crutch. If you guys don't have any data, have you seen any tests done? If so, post them up here! Thanks!

[MEAN LT1]

Do any of you guys have any real data of a back-to-back comparison between a single-plane/elbow intake setup, versus a single-plane with a 4bbl TB setup? My next build will be turning some higher rpm and feeding some more cubes, and i'm thinking that the elbow MAY become a crutch. If you guys don't have any data, have you seen any tests done? If so, post them up here! Thanks!

There was a big thread on this on LS1tech in the tuning section I beleive. It shouldnt be too hard to find. The thread was started by Fastfatboy.

[joelster]

There was a big thread on this on LS1tech in the tuning section I beleive. It shouldnt be too hard to find. The thread was started by Fastfatboy.

Thanks for the lead! FASTFATBOY didn't start the thread but I found it through his posts. Here it is for anyone interested:


http://www.ls1tech.com/forums/dynamometer-results-comparisons/1031160-408-w-vic-jr-dyno-s-after-t-b-change.html

Basically you WILL make gains when you switch from an intake elbow/traditional TB, to a 4bbl TB/carb hat, due to the much better air distribution that the 4150 style TB makes. I'm still wondering if the carb hat is potentially robbing some power though. I'd like to see a comparison of a 4150 TB/carb hat combo, versus the same 4150 TB with no hat running in speed density. The speed density setup could run air from the back of the cowl induction hood. Wonder what the power difference would be.

[Pro-jection Eng]

from the title of your thread, were you hoping to get many replies? lol

if that thread is the one I'm thinking of the guy was using one of those ultra low profile elbows from edelbrock that has no radius to the thing. Now, because I run strictly speed density, I'll be going with probably a 4500 tb and intake. But on the average 650 hp motor I'm not sure if a good large radius sheetmetal elbow would hurt any power. Say goodbye to a chunk of your cowl, and a few hundred bucks for a big extended cowl hood.

[joelster]

I run a Harwood with a 4" cowl so that's not a problem for me. Even the guys running regular elbows saw gains going to the 4bbl TB. It probably has to do with the 4-holeTB better distributing the air to the front cylinders or something. The guy you are referring to went from the restrictive Edelbrock short elbow to a Wilson (or similar) and saw huge gains. My current setup is an elbow that is custom and doesn't look nearly as restrictive as that Edelbrock piece. I still think that even a carb hat HAS to be more restrictive than the 4bbl TB just sucking air from under the cowl though. It's just simple logic to me. Air doesn't like to make a 90 degree bend whether it's from an elbow or a carb hat.

I didn't mean to discourage people from posting by making the title 9-secs or faster, but I didn't want a bunch of replies from 14-second drivers with internet knowledge either, ya know? lol. I was hoping Tony S and Mike J would chime in with their experiences and whatnot. It's always good to hear information from the source.

With regards to your car, how hard was it to tune? I'm not up-to-snuff on my speed density knowledge. What sensors does SD rely on at WOT? Can you simply unplug the MAF and run it like that or do you have to tune the MAF tables out? Your car looks real good BTW!

[Pro-jection Eng]

thanks for the compliment! SD uses the MAP and IAT sensors to determine air density and engine load. Basically the same way a carb meters incoming air based on vacuum signal. You can put the computer in SD mode to avoid setting the MAF codes, or the car will automatically run on the VE tables if you unplug the MAF. I think the VE tables are pretty straight forward, and I spent a lot of time working with them as I deleted my o2 sensors. wasn't hard with the stock computer, just time consuming because of the datalogging, changing, loading, repeat. should be loads easier with the DFI though, even though the cam is going to be pretty radical, because I can real-time tune, datalog, input a wideband, and the interface is a lot more user friendly.

Yea, the advantage of the 4 hole TB is negated if someone was to run a carb hat on it, that's where the SD comes in. I figure if I'm spending the big bucks for a trick throttle body and converted manifold, I might as well go 4500 to get a little better distribution in the manifold for only a few more dollars. If it picks up any I don't know. There was a thread on yellowbullet of a guy picking up 30rwhp with 2000cfm 4500 TB over a 1200 cfm 4150, this was on a 420 inch sbc on nitrous running 8s. He put a 1600 cfm 4500 TB on it and it lost 5 rwhp from the 2000 cfm.

[Tony Shepherd]

Do any of you guys have any real data of a back-to-back comparison between a single-plane/elbow intake setup, versus a single-plane with a 4bbl TB setup? My next build will be turning some higher rpm and feeding some more cubes, and i'm thinking that the elbow MAY become a crutch. If you guys don't have any data, have you seen any tests done? If so, post them up here! Thanks!


I am converting from a 4150 flange single plane with elbow to a 4500 flange intake with 2000 cfm 4 hole T-B. I know it will improve but I am also changing to better flowing heads so the data I will have will be skewed.

[joelster]

I see 8's in your future!!!!!!!!!!!!!!!!!!!

[Tony Shepherd]

I see 8's in your future!!!!!!!!!!!!!!!!!!!

Better be 8's or I quit! LMAO!

3968
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[AChotrod]

More intake porn^^^^^ Sexy!!

[Paulster2]

Better be 8's or I quit! LMAO!

3968
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Dang Tony ... you think the throat of that thing is big enough? Noice!

[paul95z]

Not very often you see the injectors above the fogger nozzles. Any particular reason for this?

[Tony Shepherd]

Not very often you see the injectors above the fogger nozzles. Any particular reason for this?


I see it all the time. Taner's fogger setup is the same way. Works well.

[Pro-jection Eng]

the fuel *should* atomize better the higher it is introduced into the intake runner.