Has anyone had their turbo Extrude Honed? If so, what gains in either HP or flow did you experience? My turbo is on the way and I decided to get the Stage 5 T04E/T3.

It is supposed to help with spool. Ryan Besterwich, Mike Kojima, and Ben Benavides all had their exhaust housings Extrude Honed! I am sending in my exhaust housing next week when my turbo comes in!

I've read up to 500 rpm sooner spool up.

for abut 100 bux thats pretty good.

anyone know anything about doing an f-max mainifold?

I was really wondering if anyone has had their complete turbo done. They offer wheel and compressor honing as well. I wonder how much more efficient will the turbo be after that.

can u e-mail me when u get a chance Rob?.

Originally posted by se-riously boosted
can u e-mail me when u get a chance Rob?.

Are you getting my PM's? I ahve sent about 2 and had nsracer contact you about the TO & P bearings. Later.

Your PM box is full. Did you get my emails about the package I sent you on Monday?

Originally posted by QuickZeek
I've read up to 500 rpm sooner spool up.

for abut 100 bux thats pretty good.

anyone know anything about doing an f-max mainifold?


where are you getting that price from? I was seeing $250 on the EH web-site.

I think people do no extrude hone the Fmax manifold because it is made partially out of tubular steel, not cast iron. I know some of the peices are cast, but perhaps they are really smooth or something. Anyway, to make a long story short, no one I know has ever done it, and there are a lot of people that have the means to do it, so it leads me to believe it won't help at all.

I was talking about processing the entire turbo itself. EH charges $250 to do the complete turbo. It includes both housings and the turbine wheel. I bet spool up characteristics might approach the ball bearing unit.

Originally posted by Big Boost
I was talking about processing the entire turbo itself. EH charges $250 to do the complete turbo. It includes both housings and the turbine wheel. I bet spool up characteristics might approach the ball bearing unit.

Cadle pointed out better transient response, more efficiency and better spool.

Obviously all that add up to increased HP.

Just think of that mixed with a twin BB center cartridge! :eek:

I'm thinking twin BB large housing T28 with the entire turbo extrude honed...300whp and what lag.

As soon as I receive my turbo, I'll be sending it out to Extrude Hone for the full blown treatment. I expect that it should be extremely more efficient and responsive. It looks very promising.

Hey Big:

I know it will probably be a little while before you put this setup together, but i'm really interested in knowing how the EH turbo will perform. So can you please let us know your impressions when you have it running? :)

I was thinking about this option as well. I want to pick up an S15 T28 and was thinking of having that Extrude honed. I want a VERY responsive turbo since my car is primarily used for autocrossing. Hopefully Rob's results will show us what the $250 does for us!

Originally posted by wes
I was thinking about this option as well. I want to pick up an S15 T28 and was thinking of having that Extrude honed. I want a VERY responsive turbo since my car is primarily used for autocrossing. Hopefully Rob's results will show us what the $250 does for us!

$250! Yikes.

Last I checked it was $70 for the turbine housing and I can't see why the Compressor would be more to that's $140. So the wheel is $110!

I just looked at the site and that includes the wheel. Here's what it says.

"Turbo Impellers & Housing 250.00 "

I think 250 is for Both Housings and the turbine wheel

wow back in 94 my heads were 450 bucks and intake man upper&lower was 550 to extrude hone.

It cost me ~$70 to get my turbine housing extrude honed. BTW Jay, my turbo is a full ball bearing (both sides) turbo with the extrude honed housing. Hee hee! Full boost by 3700 and instant response when it's spooled. And when you shut the car off, the turbo spins for a full 30 seconds afterwards. :)

I would only extrude hone the turbine housing.

EH on the compressor housing has not been shown to be a proven power adder to my satisfaction..... meaning I have not seen dyno data to support the claim it is beneficial. On the gas stand, EH on the turbine housing produces a measurable and significant improvement in turbine performance. No significant improvement in compressor performance has been shown with EH on the compressor housing.

I am suspicious about the benefits of EH on turbine and compressor wheels. I have spoken to Ed at EH about this on several occasions. I believe that EH is a very honorable company, and I in no way wish to question their expertise or their process... However, I have a hard time seeing where the magnitude of their claims comes from.

The surface finish on Garrett (as opposed to some of the low-quality aftermarket rip-off companies) turbine and compressor wheels is first rate. I simply do not believe that the EH process is capable of producing a measure improvement in performance just from improvments in surface finish. It is my belief that if the EH process really does what EH claims it does on wheels, then it is as a result of thinning the blades on the wheel. This will definitely improve performance but has an indetermanate and unknown effect on the structural integrity of the wheel. Turbocharger compressor wheels are subjected to cyclic stresses of over 40,000 psi. Think about that. This is right at the limit of what cast aluminum can stand... over it, really. Thinning the blades isn't a good thing, IMO. The turbines are also subjected to extreme cyclic stress, from both the centrifugal forces in the wheel, and from the extreme thermal gradients. This is a brutal hellish environment we're talking about.

Ed claimed that another customer actually observed an *INCREASE* in wheel blade frequency after doing the EH process. I can believe that this is possible. However, I have not seen the data for myself, so I remain skeptical.

My opinion is this: EH on the turbine housing is a no brainer: it is not expensive, it gives measurable improvements in performance, and it offers no durability risk. I would personally skip the process on other areas of the turbo.