Port turbine housing for more flow or Extrudehone??????

[Shadow]

Alrighty, prob one of the only things I'm considering changing so what do you guys think? The Clipped wheel (HE351) worked like a charm and now I'm considering porting the turbine housing.

Most don't have a clue as to what it takes as is goes beyond just porting a couple inches past the flange into the housing.

I'm obviously talking about opening up the A/R of the housing here, which, by it's very proccess, extrude honing Should be Da bomb!!!

One? The other? Combo of both? Let me know what you think and if any of you have any specific info on either techniche.

[bakes]

I ported the hell out of the turbine side on my S60 and it made a noticeable difference also did the compressor housing . But i wouldn't just limit yourself to the turbine side the is a lot of gains in compressor side as well. I think your on the right track a full ported and clipped holset would rock!!!

[black86glhs]

I would port, hone, sand, rub with toothpaste. Whatever you deem necessary to do what you think it will.

[Shadow]

Well, what I'm looking for is if anyone has any actual experience in this area or knows of anyone (close enough to them to trust) that has had success doing this.

Guessing it's a long shot, specially in our little community, but I thought I'd throw it out there anyways.

And Bakes, you are correct, there is no bolt-on housing upgrade that I'm aware of for this turbo other than the diesel housing/turbine wheel upgrades and I don't think we need a bigger wheel to get this done. So I'm hoping to put together a ported/clipped upgrade that will take this turbo to 600WHP with nicer drive pressure than it would otherwise have.

Not too concerned about the compressor till I change something on the mtr. ie. better head/cam/ solid lifters/header. Remember, I went to larger 3" I/C piping to Slow down the flow so the mtr could catch up to things already. Don't need any more comp flow till the mtr can breath it more efficiently.

[bakes]

When i removed the trubine housing i was impressed by the casting and machining from the factory on the holsets . The only thing I ported the turbine housing was the inlet to the scroll which need very little remove to smooth it out and i opened up the waste gate hole to the max.
PS my Holest is a he341 that is going onto Rattrap

[black86glhs]

Gotcha. I thought you were asking if you should. I know extrude honing it will be $$$$.

[RoadWarrior222]

Yah, extrude honing should theoretically be cheap, but isn't, must be demand based. Also, it neither intelligently removes material, or cuts the best shape for high speed flow. If you've got a stagnant spot in there, it will take a hella lot of passes of extrude hone stuff to get any change... on account of if that stuff ain't moving, it ain't carving anything.

I would port, hone, sand, rub with toothpaste.

Toothpaste might have been a good finishing compound back in the day, if you wanted to mirror finish it after the finest grit, but it seems to me that toothpastes have got a darn sight less abrasive than they used to be. Maybe that's to keep up with ADA approval, 'coz their members make a lot of money on the biannual or quarterly cleanings.

---------- Post added at 07:20 AM ---------- Previous post was at 07:14 AM ----------

BTW, this is how a river "extrude hone ports" a slight bend in it's course...



Looks efficient?

Really the best use of EHP is in the deepest darkest unreachable bits of a cast header or manifold, that's all.

[RoadWarrior222]

Well you get silt deposition as another factor in river erosion, but it will still cut most where the flow is fastest and cut least where the flow is slowest...

[black86glhs]

If you can get a quality job for that or even a little more, that is easily doable. As you know, the inside will look and flow nicely. Hopefully you can find more info on it.

[zin]

I think you'd do well with the extrude hone, it's meant to knock down the "high spots" or more accurately, the point of greatest restriction, and with the small amount of material you'll be removing, I don't think you'll have to worry about creating an oxbow lake in your turbine housing.

That being said, if there is something you don't want to be "eroded", you'd have to have tooling made to shield that portion, which is where it gets expensive, if it's required...

Mike

[BadAssPerformance]

Well you get silt deposition as another factor in river erosion, but it will still cut most where the flow is fastest and cut least where the flow is slowest...

Erosion works differently with different mediums... A river is water (typically) and a shore is mud (ypically) and extrude hone is more like playdough and a turbine housing is cast iron... so results will probably not match the river example

[RoadWarrior222]

That's like saying that gas burns at a different AFR in different engine capacities. It will always cut harder on the fastest flow side, and less on the slowest flow side.

[BadAssPerformance]

It will always cut harder on the fastest flow side, and less on the slowest flow side.

Water on a river has a larger flow delta from shoreside to midstream and the playdough has a more consistant flow across the section... try it out... chug a glass of water, then chug a glass of peanut butter

[RoadWarrior222]

Nope, you see the delta on peanut butter if you try to pour it, it falls over itself because of surface drag.

[BadAssPerformance]

Nope, you see the delta on peanut butter if you try to pour it, it falls over itself because of surface drag.

at a much, much, much slower rate than water...

besides extrude hone is pressed thru, not gravity pourded

[bakes]

Rob I would get the compresor housing done at the same time. better flow on the compressor side will help drop the air charge temps for the same or more boost.