Has anyone taken an Ecoboost Mustang and swapped the forced induction to a supercharger?

You want throttle response?  Take off the big flywheel, install a flex plate and a five inch, three disc clutch on your V8. Zing.

Knurled. said:

frenchyd said:

rslifkin said:

The current gen 5.0 is pretty good sounding IMO.  Not the best exhaust not ever and no comparison to the GT350, but it's pretty good. 

It's mostly low revving tractor motor V8s that sound bad.  Add a little more cam, make sure it's got enough compression and open up the intake a bit and they sound at least decent given a good exhaust layout.  IMO, x-piped or merged to a single sounds far better than separated duals. 

The sound of a V8 is a six cylinder with a stumble.  That’s because at least two cylinders fire right on top of each other.  Depending on the firing order any V8 will have adjacent cylinders between 90 degrees and 270 degrees of the adjacent cylinder. 

The only way to hear anything else is like NASCAR stock cars do with equal length headers exiting on one side of the car.  

Not quite.  NASCAR still uses deivided exhaust, and interestingly one person tested a Cup engine with 8" stubs dumping into a 4" diameter log with no collector and no attempt to tune whatsoever, and found no appreciable power loss.

 

Most of the reason they dump out the side is because there is no room under the car for exhaust with the truck arms in the way.  The rest is probably thrust vectoring.

 We digress, the exhaust note commonly heard on a V8 is 6 cylinders and a stumble. Unless you have “Lake pipes” ( 4 cylinders on a side. ) The exhaust is still equal length and the reason they exit the side is partially thrust vectoring as you say but it is also to reduce drag. Exhaust pipes hanging down into the under chassis airstream would add significant unwanted drag. 

As far as a log manifold goes, please define significant?  10%,5%? 3%?  At that level of racing the tiniest difference makes a serious change.  I’ll admit I’ve never been in a 200 MPH draft on the high banks of Daytona. But until I see the winner show up with a log manifold as you describe I’ll have to question the validity of that statement. 

Knurled. said:

In reply to slefain :

That's a centrifugal suparcharger, not a blower.  Biiiiig difference

Thanks for the technical correction. BTW, it is spelled "supercharger."

In reply to frenchyd :

You would need to be a member to see the post, but it "never was within 8hp [of the racing header] but never more than 13-14hp off".

So call it 1-2%.

V8 isn't "6 cylinders and a stumble", an even firing V6 has a firing event every 240 degrees per bank.  A crossplane V8 has a firing event every 180 degrees, with one cylinder offset by 90 degrees for a 90/270 section.  The separation of pulses makes a large difference not just for sound but also tuning, as once you get much closer than a 270 degree separation, intake and exhaust design start to get important because the intake events (or exhaust events) can interfere with each other.

slefain said:

Knurled. said:

In reply to slefain :

That's a centrifugal suparcharger, not a blower.  Biiiiig difference

Thanks for the technical correction. BTW, it is spelled "supercharger."

What if it's on a Camero? 

I really need to quit posting from the tablet, it's far too easy to fat finger things.

stanger_missle said:

STM317 said:

There are no good sounding 4 cylinders, only those that don't sound awful.

The Fiat 500 Abarth would like to have a word with you .

 

I was actually going to suggest both the Abarth and original Fiat 124. The Italians know how to make an engine sound good.

STM317 said:

There are no good sounding 4 cylinders

Honda's VFR just called and it said you're all sorts of wrong.

Knurled. said:

ultraclyde said:

All the modern mustang V8s need for damn sharp throttle response is the right tune.

 

And a zero-weight flywheel and an ultralight rotating assembly.

 

Throttle response on acceleration is one thing, but the ability for the tires to regain traction on engine braking is another.  That is important if you're concerned with going around corners and stuff and driving just a little bit past the limit.  The only way to get that is to minimize engine inertia, so the tires can force the engine to speed up more easily instead of just sitting there sliding.

 

You could drive more conservatively, but that's not nearly as fun.

 

This is one area where four cylinder engines are very good.  Twice per revolution all pistons are near TDC/BDC, so engine friction reduces to whatever is in the valvetrain.  This makes for a somewhat vibrationy driving experience but it's also great for regaining traction.

That's probably the first time I've head anyone make that argument that a v8 drivetrain's inertia being an issue with regaining traction. I understand what you're saying as on paper it makes sense but I cant ever think of a single time that I've felt that a car's engine's inertia was ever causing any kind of issue with regaining traction at off-throttle, i would think it'd have to be something with a huge engine and comically narrow tires to really see the issue.

I dont have a lot of actual racing experience under my belt either though so maybe it's a more noticeable problem then but it'd just never heard of that being a concern before.

The rotating weight issue is more likely to be an issue if you stuff a huge engine into a small car.  If you're within a reasonable realm of car size/weight vs engine vs tire, etc. it's unlikely to be of much concern until you've already optimized just about everything else.  

mad_machine said:

stanger_missle said:

STM317 said:

There are no good sounding 4 cylinders, only those that don't sound awful.

The Fiat 500 Abarth would like to have a word with you .

 

I was actually going to suggest both the Abarth and original Fiat 124. The Italians know how to make an engine sound good.

The original Alfa twin cam as well. Especially with the back box replaced by a straight pipe.

I think those Ford engine  designers  are very smart. Masters,phd's, kind of folks. I don't think you could improve it much.