Does More Boost PSI = More Horsepower????

[@Moparmaga-1]

Awesome, I never thought of it that way & it makes complete sense.

[@1dave301]

I tell people that the boost gauge is measuring how much pressure ISN"T getting into the cylinders.

[@dougderby9454]

30 years ago. A retired F1 engineer had designed an Ecu system for a co. I was testing it for them. The things I learned from that guy in regards to turbo engines and setup. 20 years of a chassis Dyno. Majority of the cars are turbo or supercharged. Amazing how many are leaving Hp and reliability even with all the technology that’s available for free.

[@scottk2342]

Here is what I’ve learned boost is a multiplier of N/A horsepower.Listen guys he’s 100% correct boost PSI is restriction.A cold side of a turbo for instance only flows so much air. Basically the more N/A power the lower the boost pressure and the more forgiving the tuneup can be.Oh not to mention lower fuel requirements just my 2 cents…

[@1dave301]

Another topic for discussion, You have to lower the engine's compression ratio to add boost. I've debated this subject w several people. I remind them that the current modern engines w superchargers have in the ballpark of 10:1 compression.

[@SalterRacingEngines]

@@1dave301 yeah I wish I had somebody who knew a whole lot about this subject to moderate some of this I can't do it all and a lot of times the density boost guys like to gang up on me regardless of how much they missed the point they think they're right like I tried to tell them if you'll build that engine naturally aspirated to make power and then add your boost it would really open their eyes to what they're missing

[@michaelmerrill589]

Better flowing engines make more power with lower boost. I only have 18 psi boost on my setup.

[@ummduhgmail]

Because they make more power to begin with. 15psi is still basically going to double either combo, the result just depends on where you start

[@TerryBall-v8l]

Dam,you guys are smart!!

[@finnroen2334]

I can not believe a man like you could say something like that. Only Roots-fan junk uses the intake manifold to compress and heat the air. It is like Gale Banks himself states, Turbochargers and intercoolers are air density devices. They enable every engine to move a greater mass of air, pr. volume of air it takes in. Then you need to add more mass of fuel to hold the AFR to the same level and that is what it is all about, right? :)

[@Fk8td]

Nope. So obvious to a good tuner. Many many times I’ve made more power on less boost. Even with a the same exact set up. Just like cfm doesn’t mean hp. Just like people think a certain boost pressure lifts a head. Not true cylinder pressure lifts a head. Less ignition timing on the same boost equals less cylinder pressure.

[@notsponsored103]

I like to think of a boosted engine as one that's just operating in a higher pressure atmosphere. For example. 30psi Absolute in the Intake and, let's say 30psi Absolute in the Exhaust pre turbo (1:1 pressure ratio across the Head). That's simply One Atmosphere above what a Naturally Aspirated engine operates in. The flow through the Head is obviously still a critical factor in the production of power.

[@rolandotillit2867]

So in other words, if it works for N/A, it'll work for boost, as long as you're mindful of the effects boost has on, combustion and temperatures.

[@SalterRacingEngines]

@@rolandotillit2867 I just put a video up it really short one check that one out

[@SalterRacingEngines]

@@rolandotillit2867 oh sorry never mind my brain is fried right now been very busy. Combustion temperatures only go up when the fuel air ratio is wrong is too one way or the other but yes basically what you said is correct.

[@rolandotillit2867]

@@SalterRacingEngines More boost means more heat, just from compressing the air, as per your video.

[@carlpreston1680]

​@@rolandotillit2867 yes heat is byproduct of compression no matter what's compressing the air that's how diesels work compression ignition

[@utahcountypicazospage5412]

I’ve always said don’t go off of boost go off of power to the wheels.if you can’t cool it more boost hurts your power

[@LukeSportsman]

Back to earlier video.... How do you know how much you can tighten a SR lash ( outside obvious of holding valve open). If the cam lobes were designed for .020" hot so your setting at 014" cold. What is risk of closing to say .009" cold (Al heads/ iron block)?

[@SalterRacingEngines]

@@LukeSportsman no risk at that lash. You can try it out just be accurate and make sure they are all the same. When they put a lash recommendation on the cam card they're taking into consideration the profile of their cam for example a loose ramp design requires a looser lash and that is so you will get the valve action the cam was designed to do. If you tighten the lash up on a loose ramp camshaft your valve action will be slightly slower than it was designed to be but it won't hurt anything.

[@LukeSportsman]

@@SalterRacingEngines I've enjoyed your videos and information your sharing. Thanks for response!

[@markmcmullen1371]

Good explanation 👍

[@Redneckairflow]

What's your thoughts on combustion chamber coatings vs polished and same on piston tops?

[@josephverdone7099]

In 1995 for SEMA MR Gasket, Vortech, Comp Cams, Lingenfelter, Accell, Chevrolet Racing, Bear Brakes built a supercharged TPI New ZZ4, Art Carr transmission @ 10 pounds 750 HP. Wheel to Wheel heads big cfm.

[@TimothyArnott-m7z]

Boost is a measurement of restriction, YES, amoungst other variables....ur "conversation" motor made dbl the the power on LESS boost, cuz it wasnt restricted.....EVERYTHING in a built combo MUST work in harmony.......its NOT a simple deal, or simple equation.......head flow, intake flow, EXHAUST flow (a biggie that folks disregard) MUST work together......all these LOUD Mustangs, with 4" exhaust, will run SLOWER, Tahn a properly thought out combo, with 2 1/2" or 3 " exhaust.....they dont understand an ICE..BIG loud exhaust, removes any propensity of the engin to scavenge.......bigger aint always better.......appropriate sized tubes FOR the given combo IS the way to make power......the exhaust pulses MUST be able to scavenge......even with boost......if even just a bit.....the pressure wave MUST be able to begin to suck out a cyl to fill it back up, in a resorceful way.......dug the vid, i may have mangled what i was tryin to say, but i hope it got thru!!

[@scotthatch4548]

I realize you are standing in a parking lot but at 30 lbs of boost 300 hp its 900hp output ... With 600 hp it would take 15 lbs of boost for 1200 hp not 10 lbs ... Just saying But yes lower boost is better .. build the best engine you can ..then add boost

[@SalterRacingEngines]

@@scotthatch4548 I have no idea how you come up with those figures

[@scotthatch4548]

@@SalterRacingEngines really? You don't understand that boost is proportional to HP? 1 atmosphere is 14.7 lbs of pressure .... So NA engine runs at 14.7 ....if you boost it with 14.7 above that you double the HP ...

[@SalterRacingEngines]

@@scotthatch4548 yeah that ain't how it works at all in fact if that were true that would be completely contradicting the the video I made. With that theory you haven't calculated in the ability of the induction system that boost is going into you have no idea of the static or dynamic compression ratio you have no idea of the cubic inch you're even talking about plus 1100 other factors that are unknowns, so how you can come up with that conclusion I do not understand. But if that's what you believe I guess that's okay it's just not true.

[@SalterRacingEngines]

@@scotthatch4548 let me explain this to you if you put 30 lb of boost through a straw do you think that's going to make 600 horsepower just to have a generic number to go off of Or if I put 30 lb of boost through a 4-inch pipe that is all relative that's why boost is a measurement of restriction your theory only works on paper and honestly it doesn't even work on paper I'm not being mean I'm just trying to help you understand what really happens in reality.

[@scotthatch4548]

@@SalterRacingEngines if you don't believe me look at some of Richard Holdener Dyno tests that show it ..... Whatever the NA engine makes boost raises the HP up proportionally .... Now with a roots supercharger you have drive loss and same with centrifugal but not as much so it's easier to see with turbo boost .... The rest of the stuff does not matter for the boost though it will effect the original NA engine power ... Now you are correct that boost makes heat but that can be dealt with by fuel choice or intercooler or boost juice .... The higher density air still behaves in the engine just like regular density air but you make more power because it has more O2 and that is proportional to the density and density is proportional to the pressure