My Engine with a Carburetor
02-04-2017, 11:10 AM
#11
Same heads and cam. According to the Hot Rod Magazine intake manifold comparison, the dual-plane manifold has a good torque number, but the graph drops off and has a lumpy shape as rpm increases. The NNBS cathedral port manifold that I am using graphs a very smooth and rising curve in comparison, with significantly more HP at the peak.
So I have maybe not ideal timing, definitely not ideal AFR, and a not as good intake.
Sorry, if we were golfing I would give my excuses before the game started.
So I have maybe not ideal timing, definitely not ideal AFR, and a not as good intake.
Sorry, if we were golfing I would give my excuses before the game started.
02-04-2017, 11:36 AM
#12
I had a Vic Jr. and switched because of the Hot Rod Magazine LS manifold comparison dyno test. It always felt lethargic out of boost with that manifold, and the article gave me reason to switch. I hope it is peppier out of boost with the TBSS type manifold once it gets a proper tune.
Their dyno graph of that manifold proves to me (Edit: gives me the opinion) that it has no place on any street driven vehicle.
Their dyno graph of that manifold proves to me (Edit: gives me the opinion) that it has no place on any street driven vehicle.
Last edited by MikeGyver; 02-04-2017 at 12:53 PM.
02-04-2017, 03:51 PM
#14
I had a Vic Jr. and switched because of the Hot Rod Magazine LS manifold comparison dyno test. It always felt lethargic out of boost with that manifold, and the article gave me reason to switch. I hope it is peppier out of boost with the TBSS type manifold once it gets a proper tune.
Their dyno graph of that manifold proves to me (Edit: gives me the opinion) that it has no place on any street driven vehicle.
Their dyno graph of that manifold proves to me (Edit: gives me the opinion) that it has no place on any street driven vehicle.
02-04-2017, 05:42 PM
#16
in the past i've had a truck, ls1, ls6, ported fast 90, vic jr, and been a part of builds with TBSS and fast 102. the throttle response of a vic jr outperformed all of them when set up with a proper cam and carb/throttle body (i assume the throttle body although i have no experience with a 4150) ask dirt track racer. he is the only one around here that i know of with EFI Experience on the vic jr. pretty sure he has tried multiple EFI style intakes too for past experience.
but boost dont seem to care once it is in so it doesnt matter.
Last edited by TXsilverado; 02-04-2017 at 05:52 PM.
02-04-2017, 06:59 PM
#17
the elbow in EFI/FI is what kills the power of that intake. it's been proven over and over. I assume you ran an elbow which would explain the out of boost laziness you felt you also need a cam with valve events that suite the single plane intake. ... paired with the right cam and a 4150 throttle body it will absolutely rip while being more cost effective.
That all gives me a little more confidence that the manifold that I chose will do what I hoped that it will, since everything about my engine leans toward wanting a TBSS manifold.
02-04-2017, 09:10 PM
#18
smart *** thanks captain obvious 
i'm not trying to be some all knowing dick, just my experience/criticism of internet dyno sessions. but you're absolutely right. it's all about the combo. throw the most expensive parts at a build and miss the mark if there is no method to the madness. i've spent a ton of money to achieve bigger dyno numbers while going slower on past builds. i know N/A and nitrous. i'm super late to this FI world. typical cam specs of typical ls style long runner intake doesnt play as well to with short runner vic jr intakes. not sure if it's different between a EFI style vic jr vs a less efficient carb vic jr intake that requries more carb signal to pull proper fuel.
i agree with you. i think the TBSS intake is the best for your combo.
thanks captain obvious i'm not trying to be some all knowing dick, just my experience/criticism of internet dyno sessions. but you're absolutely right. it's all about the combo. throw the most expensive parts at a build and miss the mark if there is no method to the madness. i've spent a ton of money to achieve bigger dyno numbers while going slower on past builds. i know N/A and nitrous. i'm super late to this FI world. typical cam specs of typical ls style long runner intake doesnt play as well to with short runner vic jr intakes. not sure if it's different between a EFI style vic jr vs a less efficient carb vic jr intake that requries more carb signal to pull proper fuel. i agree with you. i think the TBSS intake is the best for your combo.
Last edited by TXsilverado; 02-04-2017 at 09:26 PM.