I love this thread. I am hoping to hear more news about the 5.8 lliter engine. The 5.8 liter GT500 is what I have been waiting to purchase. I would have preferred a larger displacement engine like 6.4 or 6.5 liters. However, I still intend on placing an order for this proposed 5.8 liter GT500.

 

ha 620-650hp isnt enough? with a 6.4 the car would probably be at 800 hp

 

Have you ever driven a 5.4 GT500? they have so much power you really don't need any more displacment.

A supercharged 5.8L engine with 9psi of boost is theoretically acting as a 9.3L engine.

Just so everyone understands the math. Normal atmosphere pressure is 14.7psi, 9psi is 61% of 14.7 so the engine is taking in 61% more air than normal giving it a usable displace of 61% bigger or 9.3L.

 

So technically I could say I have a 9.3L under the hood?

 

No, that would be an uneducated statement. However, Knight is correct in his math. Superchargers cram more air and fuel into the cylinders, thus mimicking a much larger displacement engine.

For example, back in the mid to late 1980's when Buick's Grand Nationals were ruling the dragstrips with their tiny 3.8L Turbo V6's, the NHRA changed the rules to make them have to run heads up against V8's that were twice the displacement to level the playing field.

Another example: My '07 Mustang GT had a Vortech V2 supercharger. At redline it made 11 psi of boost. 11/14.7 = 75%. Vortech rated the V2 at 72% efficiency, so .75 * .72 = 54%. Therefor, I should have expected 54% more power than stock. Stock dyno #'s for my GT automatic were about 240 rwhp so I should have expected about 360 rwhp with no other changes. I had high-flow cats, X-pipe, hotter COP's, and custom dyno tuning that brought it up to 393 rwhp, though. To get that kind of increase (54%) without forced induction or mods, would have required boring and/or stroking the 4.6L engine to 7.1L to get the same results.

 

Thank you Brian for elaborating.

 

I completely understood from the original statement. Perhaps i should be clearer with my sarcasm haha. But yea i understand the math and everything. One of the guys i went to high school with actually just picker up a grand national engine and hes dropping that into his dads old mx-5
Idk how hes gonna do it but hes determined to make it work

 

I didn't quite get that part...

 

Idk how he is going to do it but he is determined to pull it off. Goo enough for ya?? Lol

 

Was just teasing ya'.....

 

Excited to find out for sure what this engine's architecture is!

 

Haha

Ill be teasin them 'maro's and vettes once i get my grubby lil hands on this monsters wheel

 

I hope you are right Knight. If the 5.8 Liter GT500 does not have enough power to satisfy me, I will be the first to let you know. By the way, I like large displacement engines for bragging purpose. I am done with small displacement engines.

 

Frankly, I find it odd to dismiss smaller displacement engines, considering the power they can make nowadays in a much leaner, better balanced package, and demand big displacement simply for the sake of big displacement...but to each his own...

The size of the engine alone is hardly worth bragging about in this day and age unless perhaps you're in highschool.

 

Good example of this is the new 3.7 v6 engine. 305hp and 280ft lbs, kicks my old 4.6 v8 gt i used to have (2002)
Plus any well built engine can be tuned to make some pretty stupid power, look at all the tuning companies puttin out gtr's woth over 1000hp!

 

Exactly.

 

What a larger displacement engine brings to the table is flying right over both your heads. It has nothing to do with peak power or peak torque and has everything to do with more average power which is what counts in the drag racing game or when your pulling out of a corner or where ever brute force is needed to get the job done and when you apply the same tricks that they use to get such steller performance out of the 3.7 and 5.0, a bigger engine will trump a smaller engine every time.

As an example say if Ford built a 5.8 Boss motor pretty much by just bumping the displacement of the 5.0 Boss to 5.8 it would probably make peak power about 500 rpm lower yet still offer an easy 40+ hp over the road runner's 444hp make that same torque at the Road Runner's peak power rpm and this hypothetical 5.8 Boss motor would have a 60+ horsepower advantage and in both cases on the way to the redline, this 5.8 road runner engine would have better torque and power values across the board giving it more average power.

 

did I just learn some thing??? dangit!

 

I keener that he needs to learn how to use (.p.e.r.i.o.d.s.).

 

Meh, nothing "over my head" here. I'm quite familiar with the old "no replacement for displacement" adage. Of course if you apply the 5.0's "tricks" to a big engine you're going to get impressive performance. I still feel that big displacement is a sledgehammer's solution to a a problem that could be answered by a rapier. I much prefer a better balanced package that still has plenty of power to a big, nose heavy lump that can go fast in a straight line. A 5.0 (and certainly a 5.8) is plenty for me though I couldn't give a crap about drag racing. Discounting smaller displacement "just cause" in this day and age is ridiculous...