Spool up on Alpha 3071's - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Mar 10, 2011 | 08:24 PM

GTstreet996

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Spool up on Alpha 3071's

When should the Alpha 3071's with all the supporting mods be spooling? Why I ask is that mine are starting to spool at 4100.
Also do you think having 47.5 m headers are cause the turbo lag?

Thanks,

Mar 10, 2011 | 08:41 PM

pinoy911tt

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i see mine full boost at about 3200-3600. i have stock headers though and marki's 2.5 inch pipings to the turbo.

Mar 10, 2011 | 08:48 PM

GTstreet996

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Quote:

Originally Posted by pinoy911tt

i see mine full boost at about 3200-3600. i have stock headers though and marki's 2.5 inch pipings to the turbo.

That is a huge difference!! Mine full boosts at over 4400

Mar 10, 2011 | 09:01 PM

pinoy911tt

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i also still have stock intercooler hoses and y pipe so i'm not sure if that's where the difference is

Mar 10, 2011 | 09:24 PM

GTstreet996

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Quote:

Originally Posted by pinoy911tt

i also still have stock intercooler hoses and y pipe so i'm not sure if that's where the difference is

If you swap out those restricted parts shouldn't you have an even quicker spool?

Mar 10, 2011 | 10:54 PM

dgreen78

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It should help a lot if you run bigger ducts to the inlets of the turbo. I have some 2.5" hose if you are interested PM me. My alpha 3076s spool the same as my 24/18Gs did!

Mar 11, 2011 | 12:42 AM

GTstreet996

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Quote:

Originally Posted by dgreen78

It should help a lot if you run bigger ducts to the inlets of the turbo. I have some 2.5" hose if you are interested PM me. My alpha 3076s spool the same as my 24/18Gs did!

Thanks mang but I have all the supporting mods. I'm putting smaller headers on this weekend 44.5 and see what happens to the boost response

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Mar 11, 2011 | 07:50 AM

Mark @ AIM Performance

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4400 seems late. have you tested for leaks?

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Mar 11, 2011 | 07:58 AM

GTstreet996

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Quote:

4400 seems late. have you tested for leaks?

I did a smoke test and tightened a few areas but nothing dramatic.

Mar 11, 2011 | 08:00 AM

#10

TiALSport

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Quote:

Originally Posted by prodigymb

4400 seems late. have you tested for leaks?

this

something is holding you back - 3076's are at full boost around 4K

Mar 11, 2011 | 08:28 AM

#11

GTstreet996

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Agreed. The boost response was the main reason why I went with Alpha's.

Can having bigger diameter 47.5 headers cause this much of a difference?

Mar 11, 2011 | 08:32 AM

#12

Mark @ AIM Performance

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Quote:

Originally Posted by TwnTurboJ

Agreed. The boost response was the main reason why I went with Alpha's.

Can having bigger diameter 47.5 headers cause this much of a difference?

eh maybe. bigger diameter primaries - slower velocity of air traveling through, given that the volume of air is constant. blow in a straw and then in a bigger straw with the same intensity...

Mar 11, 2011 | 09:04 AM

#13

Neil Switzer

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R911 997TT hits 800awtq (ft/lbs) at 4400rpm, ramping in the boost.Turbos we run are custom 30's.

Mar 12, 2011 | 08:53 AM

#14

Blockhed

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Neil at what boost LOL

Mar 12, 2011 | 01:42 PM

#15

dgreen78

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Another thing to check for is your wastegate preload on each turbo. I found that Tial does not set these from the factory. On the dyno we found one set at a crack point of 12 psi and the other at 15 psi. My turbos spooled up a few hundred RPMs quicker when we found this out.