Outer Limits 4x4 Board

Afternoon fellas.

Took the cruiser for a drive tonight for the first time with the new intake manifold/intercooler on. The intercooler doesn't have the coolant running through it yet either.

Id just like to say WOW... i thought the increased fill area would make it less responsive and have less power/torque at the same revs. But i was wrong, its more responsive and has alot more go than it did.

Just goes to show, playing with 'specifically engineered' intakes is awesome!

Dont know why im writing this but im just so surprised/happy!

good stuff mate! Got to love a good Scanas when you built something yourself


How did you go with getting a different throttle cable?

Too right mate!

I got one made 350mm longer and modified the linkages to suit.

Works perfect !

Well done, I learnt the same when I upped my snorkel size from 3" to 4" the dyno results showed an impressive change

good stuff tom

Struth wrote:Well done, I learnt the same when I upped my snorkel size from 3" to 4" the dyno results showed an impressive change

Imagine how good it'd be without a snorkle.

KiwiBacon wrote:

Struth wrote:Well done, I learnt the same when I upped my snorkel size from 3" to 4" the dyno results showed an impressive change

Imagine how good it'd be without a snorkle.

It would be much better if it wasn't sucking hot extractor air from the engine bay.

Probably wouldn't cross rivers quite so well though

But seriously it is currently running with the snorkel off for repairs and drawing air from the hole in the guard, not much different really, so I guess the 4" diameter is a good size for the length and the engines requirements.

In fact it didn't pull any more kw or Nm with the dyno fan pointed directly at a pod filter on a short intake tube to the MAF. So I don't need to imagine I know

Struth wrote:Well done, I learnt the same when I upped my snorkel size from 3" to 4" the dyno results showed an impressive change

What diameter is the throttle body butterfly on your 5.0?

sudso wrote:

Struth wrote:Well done, I learnt the same when I upped my snorkel size from 3" to 4" the dyno results showed an impressive change

What diameter is the throttle body butterfly on your 5.0?

70mm from memory

Hey Struth at the end of the day the results improved and thats what matters but it's interesting a 4" snorkel increased power over the 3" even though the throttle body further down the path is only about 2.75".
Have any other work done when you had it dyno'd?
So I'm wondering how a 3" intake was restricting airflow and power when it's gotta pass through the throttle body which is smaller again.
I mean in a vacuum situation the air required to fill a cylinder being sucked in by a piston through a small pipe would travel faster (as it has a smaller area to pass through) than being sucked through a large one, but the piston will still suck in the amount air it needs to fill the cylinder? I'm no airflow expert but I know that good air speed in the intake and manifold is needed for good low down torque.
We could say it's catching more air (if a larger snorkel head is fitted as well) but in reality the pistons would be sucking air in faster than it can be rammed in?

Any airflow/engine experts on here to explain the dynamics of all this?

sudso wrote:Hey Struth at the end of the day the results improved and thats what matters but it's interesting a 4" snorkel increased power over the 3" even though the throttle body further down the path is only about 2.75".
Have any other work done when you had it dyno'd?
So I'm wondering how a 3" intake was restricting airflow and power when it's gotta pass through the throttle body which is smaller again.
I mean in a vacuum situation the air required to fill a cylinder being sucked in by a piston through a small pipe would travel faster (as it has a smaller area to pass through) than being sucked through a large one, but the piston will still suck in the amount air it needs to fill the cylinder? I'm no airflow expert but I know that good air speed in the intake and manifold is needed for good low down torque.
We could say it's catching more air (if a larger snorkel head is fitted as well) but in reality the pistons would be sucking air in faster than it can be rammed in?

Any airflow/engine experts on here to explain the dynamics of all this?

The way I see it is you try and suck air through a 30cm water hose and the a 30m water hose. The less resistance a motor has at sucking air in the better.

Cris

Cris

ludacris wrote:

sudso wrote:Hey Struth at the end of the day the results improved and thats what matters but it's interesting a 4" snorkel increased power over the 3" even though the throttle body further down the path is only about 2.75".
Have any other work done when you had it dyno'd?
So I'm wondering how a 3" intake was restricting airflow and power when it's gotta pass through the throttle body which is smaller again.
I mean in a vacuum situation the air required to fill a cylinder being sucked in by a piston through a small pipe would travel faster (as it has a smaller area to pass through) than being sucked through a large one, but the piston will still suck in the amount air it needs to fill the cylinder? I'm no airflow expert but I know that good air speed in the intake and manifold is needed for good low down torque.
We could say it's catching more air (if a larger snorkel head is fitted as well) but in reality the pistons would be sucking air in faster than it can be rammed in?

Any airflow/engine experts on here to explain the dynamics of all this?

The way I see it is you try and suck air through a 30cm water hose and the a 30m water hose. The less resistance a motor has at sucking air in the better.

Cris

Cris

Correct. Gasflow does not only concern pipe diameter is also concerns the length of the pipe. So in essence your comparing a 70mm dia by say 50mm long restriction (the TB) to a 75mm by ~1.5m snorkel pipe.

Dan

JrZook wrote:

ludacris wrote:

sudso wrote:Hey Struth at the end of the day the results improved and thats what matters but it's interesting a 4" snorkel increased power over the 3" even though the throttle body further down the path is only about 2.75".
Have any other work done when you had it dyno'd?
So I'm wondering how a 3" intake was restricting airflow and power when it's gotta pass through the throttle body which is smaller again.
I mean in a vacuum situation the air required to fill a cylinder being sucked in by a piston through a small pipe would travel faster (as it has a smaller area to pass through) than being sucked through a large one, but the piston will still suck in the amount air it needs to fill the cylinder? I'm no airflow expert but I know that good air speed in the intake and manifold is needed for good low down torque.
We could say it's catching more air (if a larger snorkel head is fitted as well) but in reality the pistons would be sucking air in faster than it can be rammed in?

Any airflow/engine experts on here to explain the dynamics of all this?

The way I see it is you try and suck air through a 30cm water hose and the a 30m water hose. The less resistance a motor has at sucking air in the better.

Cris

Cris

Correct. Gasflow does not only concern pipe diameter is also concerns the length of the pipe. So in essence your comparing a 70mm dia by say 50mm long restriction (the TB) to a 75mm by ~1.5m snorkel pipe.

Dan

eggzackery.

there is friction and the air will 'drag' along the inside of the snorkel slowing down the air flow, the longer it is, the more resistance to air flow.

what airbox and filter setup did you end up using?

looking at doing my intercooler over the next couple of weekends

just trying to work out the best watertight method i can, and then working out how to stop rain filling it up

Geez I didn't even have to go into the whys, but volume plays a big part in it

The dyno showed peak power at plus 4rwkw, however it now occurs at 4200 rpm as opposed to 4800 rpm.

It also gave me 20% more power at 2000 rpm.

The torque curve remained flat but increased slightly, which I think is simply a characteristic of the VT 304.

Cheers