First Mods Done- Window, Headlight & Tail Light Tint Kit

[Voodooo]

I'm not talking about all things being equal, my reply wasn't even directed at you. Obviously it'll make more and that would be amazing in a perfect world lol but that's not what we're dealing with

Decrease in compression means more boost/power where it matters under full throttle

Also wouldn't be surprised to see them only running alcohol when they throw the whipple on there

Doesn't matter. Equal or not. More base compression will still make more power. The thinking of adding more boost to a low compression is old fashioned thinking.

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[Poisyn]

Doesn't matter. Equal or not. More base compression will still make more power. The thinking of adding more boost to a low compression is old fashioned thinking.

You seem to have this complex where you think everyone is always fighting or disagreeing with you, it's pretty toxic

Of course it will make more dude that's common sense, but at the cost of fortifying the fuck out of your motor

 

[Voodooo]

You seem to have this complex where you think everyone is always fighting or disagreeing with you, it's pretty toxic

Of course it will make more dude that's common sense, but at the cost of fortifying the fuck out of your motor

Well going by your response it seem pretty much that way. And I'm not arguing, that's what you're doing re-read your post to me.

 

[Voodooo]

What do you think the difference is between boost and compression. I'm not trying to argue the facts. But a higher compression with the same boost will make more power then lower compression with the same boost.

 

[flaps]

Doesn't matter. Equal or not. More base compression will still make more power. The thinking of adding more boost to a low compression is old fashioned thinking.

More compression will only make more power if your fuel can handle it without detonating. Otherwise you can run more boost with lower compression and make more power.

 

[bdub85]

I want to see the Voodoo boosted with an E85 tune. It should put out some ridiculous numbers even with lower boost.

 

[flaps]

Lower compression ratio means more head-to-cylinder head volume when the piston is at TDC. Charging that larger volume with 15 PSI of boost pressure before exploding it should make more power than putting 15 PSI of boost in to a smaller volume and exploding it.

Yes, the combustion chamber of the higher compression engine will be smaller, but it will not have less air in it than the lower compression motor if they are both running the same boost.

If you have a 12:1 compression motor at 15 psi of boost, it will be at ~356.4 psi ((15psi + 14.7psi)*12) at TDC after the compression stroke, while a 9:1 engine would only be at ~267.3 psi ((15 + 14.7)*9) at TDC. They will both have the same mass of air and fuel so you will get more power out of the higher compression motor as long as the fuel can handle that pressure without detonating.

The reason lower compression can make more power is because you can run higher boost and not detonate. If 356.4 psi is the most this motor can handle, the low compression motor can run 24.9 psi of boost to reach this pressure at TDC. That would give you more air and fuel in the larger combustion chamber and make more power than the high compression motor at 15 psi.

(And yes I know I'm simplifying the calculations here since I'm not factoring in the air getting heated from it going into a hot engine and getting compressed, and the fact that the spark plugs will fire before TDC, but the concept is the same.)

 

[GT Pony]

More compression will only make more power if your fuel can handle it without detonating. Otherwise you can run more boost with lower compression and make more power.

Yes, with higher compression the maximum safe boost level will be determined by the fuel octane which determines the limit of pre-detonation.

flaps - good explanation. I deleted my post because I realized it was wrong. You must have quoted it before it got deleted.

 

[Voodooo]

More compression will only make more power if your fuel can handle it without detonating. Otherwise you can run more boost with lower compression and make more power.

I already mentioned the fuel issues a few post ago. And that goes for boost no matter if it's on a low of high compression set up.

 

[Voodooo]

Sean Hyland also did a test with muscle mustang and they also tested a low and high compression engine both set up with the exact same setup the only difference being base compression ratios. And the higher compression engine 12.0:1 compared to 9.0:1 the same boost 25 psi. The higher compression engine made 1135 hp / 882 ft lb @ 9.0:1 vs 1350 hp / 1020 ft lb @ 12.0:1. It's along the same lines as adding boost and NOS to a engine. Even though NOS helps cool the charge it's still fill the cylinder / chamber.

 

[Poisyn]

Sean Hyland also did a test with muscle mustang and they also tested a low and high compression engine both set up with the exact same setup the only difference being base compression ratios. And the higher compression engine 12.0:1 compared to 9.0:1 the same boost 25 psi. The higher compression engine made 1135 hp / 882 ft lb @ 9.0:1 vs 1350 hp / 1020 ft lb @ 12.0:1. It's along the same lines as adding boost and NOS to a engine. Even though NOS helps cool the charge it's still fill the cylinder / chamber.

Nobody is arguing that, we're arguing that when you lower the compression you can increase psi, thus getting more power out of the same engine at a lower compression with more psi

Why would you run 25 psi on a 12:1 engine, have a mirrored 9:1 and a also run 25 when it can handle way more?

 

[Voodooo]

Nobody is arguing that, we're arguing that when you lower the compression you can increase psi, thus getting more power out of the same engine at a lower compression with more psi

Why would you run 25 psi on a 12:1 engine, have a mirrored 9:1 and a also run 25 when it can handle way more?

Thats what you're not understanding. No matter the boost psi the higher compression is still going to make more power, and it doesn't matter if you have 8.5:1 or 13.0:1 compression. You still have to tune for detonation, timing and fuel delivery and octane.
Here's my case.
A high compression engine with 12.0:1 compression say, It doesn't matter if you run 8psi or 25 psi it will still make more power then a engine with lower compression and boost. You could put lower compression Pistons in the voodoo say 10.0:1 or 9.0:1 whatever the boost you want to run, the 12.0:1 with boost is still going to make more power. Why would you want to run lower compression when the higher compression and boost still wins. And the more boost your supercharger makes the hotter the air it produces.
So the thought of running more boost in a lower compression engine isn't going to make more power then a high compression engine with boost. It's a proven fact. I'm not trying to sound argumentative, or cocky. But I've built 2 set ups and both with 12.0:1 compression and they both made more hp and tq then a Low compression with more boost. It's a proven set up. In the 90s people used to always think that they needed Low compression engines with boost. Well to prove my case, the coyote has 11.0:1 and look how that does on boost. It makes a ton of power. High compression and boost are a win win set up.

 

[Project Whitemare]

Shut the hell up and get this thread back to what it was! Lethal's badass Shelby and them showing us how to break shit!

 

[stinger556]

Lethal, in your opinion do you think this car will sound dramatically different with aftermarket headers, midpipe and catback? Or do you think it will always have that distinctive sound to some degree?

Im hoping for more of a high revving exotic type sound.

i know, i know....

 

[LethalPerformance]

Lethal, in your opinion do you think this car will sound dramatically different with aftermarket headers, midpipe and catback? Or do you think it will always have that distinctive sound to some degree?

Im hoping for more of a high revving exotic type sound.

i know, i know....

I think as long as we keep the stock mufflers on we'll get the same sound that it currently has. Going to headers or an off-road pipe will simply increase the volume and loudness of it but the mufflers will still keep it sounding the same.

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