Difference in Alpha 28 Turbos? - Page 3 - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Sep 20, 2010 | 09:58 AM

#31

Tony@epl

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Quote:

Originally Posted by TiALSport

there 'were' many revisions through out the years, but now there is only one A28

Yup, its just important for those buying used turbos to understand that the power potential of the current A28 its much different then older Alpha 28's.

If you're buying these turbos on the used market, understand fully what version your buying before you pull the trigger!

Sep 20, 2010 | 10:08 AM

#32

Powell

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Jake I expect you to be at the Mile this October. We will be providing transportation since walking is so overated!

If you would like to donate some kind of turbo for it, I will not refuse it. There will be a few other RZR's out there and I want an advantage!

Sep 20, 2010 | 02:40 PM

#33

D_Nyholm

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Quote:

Originally Posted by Tony@epl

Im not doubting what Tial told you but....there are many different alpha 28's...

The different variety Ive used, seen, tuned.
Old style (k16 exhaust housing) 2860 journal bearing,
Old style 2680 ball bearing.
New style (cast stainless steel exhaust housing) ball bearing 2860
New style journal bearing 2860
New style ball bearing 2868 billet

For the layman, can you tell us what these differences really equate to? I believe i have the Old Style (K16 exhause housing) 2860 Journal bearing in my GT610 kit. Am i at that much of a disadvantage as opposed to the new style?

Sep 20, 2010 | 02:57 PM

#34

MBailey

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Quote:

Originally Posted by D_Nyholm

I believe all the EVOMS GT610 kits came with A28s. I think the kit came after the turbo...

Sep 20, 2010 | 03:09 PM

#35

D_Nyholm

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Quote:

Originally Posted by MBailey

I believe all the EVOMS GT610 kits came with A28s. I think the kit came after the turbo...

Well, according to Tony's post, there are two different types of A28's. The 'old' style referenced in my post and the newer style. What are the differences between those?? That is where my confusion lies.

Sep 20, 2010 | 03:59 PM

#36

Ms4cd

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And, if anyone knows:
-When was the "old" style taken out of commission?
-What are the visible differences?

Sep 20, 2010 | 04:39 PM

#37

MBailey

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Quote:

Originally Posted by D_Nyholm

The old EVOMS GT turbos were Garrett GT28s in a K-16 housing, I believe. The A28s have a Tial housing. There have been changes reported in the A28s but the "newer" ones have failed to impress me as more powerful than the older ones based on track times up to now.

Sep 28, 2010 | 08:13 AM

#38

Neil Switzer

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Quote:

Originally Posted by TiALSport

if they want 'A28' there is one specific turbo, if someone says 'hey can you make this' we also do that, so techinically there is only one A28, BUT our distributors could have something they specified that is a bit different - not technically an 'A28'

Exactly...

Fact is, our "Alpha 28 based" turbochargers make 800hp on pump gas, through 200 cell cats. All day. Everyday. Spool faster than stock K16's too.

We call it our P800 package for the 996TT.

Aug 3, 2013 | 01:20 PM

#39

born2boost

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born2boost is infamous around these parts

How much does this P800 package cost ? I am interested...

Aug 7, 2013 | 03:52 AM

#40

layinback

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My out of the box alpha 28s gave me 650 whp. on race gas.

I ran 5.35 60-130 and consistent 5.5s

On Switzer and AMS dyno that's 850 whp

Aug 7, 2013 | 05:31 PM

#41

dubyaTT

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Talk about resurrecting an old thread.

Aug 7, 2013 | 07:03 PM

#42

johnspeed

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Quote:

Originally Posted by layinback

My out of the box alpha 28s gave me 650 whp. on race gas.

I ran 5.35 60-130 and consistent 5.5s

On Switzer and AMS dyno that's 850 whp

I hate to say this But seeing is believing to prove that Wheel HP number on others dyno,,especially with 28's...
I hope you do get the best and every bit of power out of them..