john gill

Absolutely fantastic work , is there a chance that the stock air filter box will fit even with a slight modification.
The smog ***** will be quick to issue defect notices to anything that is out of the ordinary here in Australia , and they are remarkably switched on to any changes from the manufacturer.

Mongo

Assuming he's using a 90mm throttle body and the airbox opening connecting the MAF is 95mm, you will need some sort of rubber shim or spacer to adapt it to the throttle body (could use something 3/16") assuming the TB is positioned at almost the exact same angle as on a factory S4/GT/GTS for the airbox to fit.

Rob Edwards

Aren't throttle bodies measured by ID? 90 mm ID plus twice the thickness of the TB wall is going to be awfully close to, say, 95.57 mm.

Might be coincidental!

That said, John, I'm not sure your smog guys are going to miss the giant Medusa-head tangle of intake runners in front of your stock air filter box....

Hilton

They might if it was surrounded with a carefully trimmed Cayenne plastic engine cover.

Rob Edwards

The Cayenne cover is 3 pieces, looks like the trio would be about $200 if cobbled together off of Ebay. Or we could steal one off the next Cayenne that goes through Greg's shop.....

Alan

So Rob are you going to be providing Greg the White test mule for this engine to go into...?

Alan

GregBBRD

Honestly did not even think about this....but I'm guessing it could happen. I'll take a look, when we next have it all mocked up on an engine.....we are actively working on details and it goes on and off a few times each day.

The stock air filter might be too restrictive?

jcorenman

Greg said the 90mm TB is an aftermarket part (I believe stock Ford 5.0L is 70mm), but those aren't the velocities that you are concerned with. The inlet side of the plenum feeds all eight cylinders and I believe the "anything worth doing is worth over-doing" rule applies, you want minimum restriction.

Where velocity matters is through the runners and especially the ports through the heads, that's the momentum that is going to pack charge into the combustion chamber. Mass times velocity, you want lots of both, at least that's what I read somewhere, once. Makes sense, though.

Greg, this is so cool. Thanks for sharing.

Speedtoys

If at all possible, the stock air box as -an- option, will make smog happy state consumers happy.

With the right finish/etc, my smog guys would see your intake, with the airbox..and see it as stock...

They think the 928sRUS EIS is stock...

jcorenman

I think the filter is OK, Louie is using it on his motor and I believe he said it was no different on the dyno, with or without. That's with an entirely different housing, with the filer in the space in front of the radiator.

What might not be OK is the transition into the MAF, seems awfully abrupt to be called a "bell".

Rob Edwards

Midnight Blue Mule. All the particulars of this iteration of Greg's intakes are for a 6.5L motor, so it would be overkill for a 5.0. And the white mule isn't street legal anyway, so tuning might be a bit of a challenge

blau928

That is interesting, I see rail problem solved if the flow is not affected..

Cool beans

928mac

Greg, is it to early to have some clue on cost for this intake with air filters on a 5L?

FredR

Some time ago I made a post querying why a BMW E39 M5 type of motor could make 400 bhp when our S4's were languishing at the 320 mark [when running correctly]. We came up with a number of thoughts and the obvious ones came to mind, exhaust, inlet tract, inlet ports cams etc.

It is interesting to see such work and would be just as interesting to know what such could do on a 5 litre motor even if it is designed for Greg's marvellous stroker motors. Jim raises the point about inlet tract velocity and logic suggests that if you can get to the runner inlet with less pressure drop then you can afford to run more velocity with a tighter inlet tract that pushes up the velocity at the valve opening- which i understand is critical to high performanc breathing.
It would be interesting to know if anyone has any theories about what this kind of system could do to facilitate better breathing on an other wise stock motor- I can visualise it making quite a bit of difference but of course the $$'s to do so cannot be cheap and especially so if revised porting were a pre-requisite-hopefully I am not hijacking this superb thread and sure look forward to learning about what it manages to achieve compared to regular ITB type projects and stock inelt plenum on the same build.

Obviously the lack of VVT also carries a penalty although not surehow much that is really worth [25 HP- more?].

Regards

Fred

Rob Edwards

Ran for the first time today. Running JDS Porsche's Alpha N, no MAF, 90 mm TB, (Greg, how big are the runners??? ) Idles nice with the magic of ST2 v.6.3.0 idle adaptation, revs like a ****, needs a bunch more tuning tomorrow. Might have to play hooky......