Extrude Honing In Sa

[Turbo Tits]

Hi everyone!

Can someone please point me in the direction of an extrude honing service in Adelaide?

They are quite elusive, white and yellowpages search didn't come up with the goods.

The only company that I can find on the net is Abrasive Flow Engineering in Sydney.

I hope someone can help.

[Turbo Tits]

In case anyone is interested, I was just quoted $650 from Abrasive Flow Engineering to extrude hone my standard RB25 exhaust manifold.

They told me they have done them before, and have increased their flow capability from ~130cfm to ~170cfm.

Not a cheap exercise! Nuts

[Busky2k]

Ouch $650 is a fair investment. At that price I'd consider an aftermarket one instead... if it were a few hundred it'd be worth while.

[Turbo Tits]

I was expecting $300 at most. $650 feels like robbery.

For me, keeping the engine bay looking legal is a must, so I guess i'll sit on it until $650 doesn't seem so bad.

May take a while...

[Busky2k]

Yeah I'm in the same sitation. The stock heat sheild hides a bigger turbo. Problem is, will the extra power (if any) be worth $650??

[Cubes]

Busky2k,

The SR exh. manifolds are pretty good standard arn't they?

[Turbo Tits]

In regards to my setup, since it is the only part of the exhaust tract that has not been modified (ie. enlarged), I'd expect some power gains, how much remains to be seen.

Say you have a setup with a standard exhaust manifold that is pushing the turbo to its limit at the top end, with boost falling off near redline, would this mean that most of the gains from extrude honing be made in the midrange?

What do you guys think?

[Madaz]

get a dremel and do yourself

[Busky2k]

Cubes, like anything, they are good up to a point. They are certianly good for response. Either way by getting an aftermarket one you are only gaining say, 5% power at the very best so value for money aint there and you have to deal with the tradeoffs (heat/not stock looking/worse response for equal lengths etc).

Turbo Tits, if boost is falling away its more likely the compressor is running out of puff. The manifolds increase the engine's volumetric efficiency, rather than the turbo's capabilities. There might be some gains to be had on the midrange but who knows... Remember you can have the primaries as large as you like but the exhaust pulse still has to squeze thru the relatively squashed turbine housing. Sorta like a storm drain with a garden spray jet on the end.

[Turbo Tits]

busky, thanks for that, it makes more sense now

madaz, screw the dremel, i'll extrude hone it myself. Swallow large amounts of abrasive matter and take a dump through each runner. done!

[Busky2k]

LOL Madaz, you'll be there for years trying to dremel out a cast manifold.

[Turbo Tits]

Just a quick update.

I got in touch with Andrew from Specialised Power Porting in Victoria. He's asking $550 for his extrude honing service. Sounds like a great guy, really helpful and willing to chat.

General turnaround time is 2 weeks. But he said if you call a few days in advance and let him know when the manifold will arrive, he can pencil in into his workload and can have it done in a few days.

[Bl4cK32]

if your gunna send it interstate, shop around for a good price / good service

Edited October 7, 2006 by Bl4cK32

[Turbo Tits]

Yep, so far i have 2 quotes. Having trouble finding local services though. On Monday i'll try calling engine builders to see if they know of anyone.