[s-cars] Turbo Replacements

Thu Dec 28 12:00:35 EST 2006

If the turbo creates boost in a more efficient manor, it will generate less 
heat.
There is and always will be the heat from compression, but not near what 
heat is created when it's done outside the efficient range.

The 2871 will spool quicker, and may result in more torque early, but I 
suspect it will run outta leg early as well.
The 3071 has a great compressor map, and should spool early and be able to 
create a ton of boost well. It too will run outta leg, but not until well up 
in the rpm range.

You really need to select the turbo for what your desired driving conditions 
will be. I have had a GT30R for several years now, I love it...but it sucks 
in stoplight to stoplight play. On the track it's response is awesome, you 
can be pulling 5000 rpm, and bury the throttle and it will pull like a 
freight train all the way until rev limit or you let off. It has so much 
power it will overpower my Spec stage 2+ clutch at 4500 RPM in basically any 
gear. It is a great turbo.. on the track or drag strip where it can be 
unleashed. On the street it sucks.

I think I have strayed off topic now :-)

Mark
----- Original Message ----- 
From: <calvinlc at earthlink.net>
To: <djdawson2 at aol.com>; <fastscirocco_2000 at yahoo.com>; <cody at 5000tq.com>; 
<s-car-list at audifans.com>
Sent: Thursday, December 28, 2006 11:31 AM
Subject: Re: [s-cars] Turbo Replacements

> Is the same true with the 2871, Dave?
> --Calvin
>
>  -----Original Message-----
>  From: djdawson2 at aol.com [mailto:djdawson2 at aol.com]
>  Sent: Thursday, December 28, 2006 9:15 AM
>  To: calvinlc at earthlink.net; fastscirocco_2000 at yahoo.com; cody at 5000tq.com;
> s-car-list at audifans.com
>  Subject: Re: [s-cars] Turbo Replacements
>
>
>  Actually, there would be less of a thermal problem doing what you stated,
> simply because the hot side of the RS2 is larger... flows better, and 
> would
> retain less heat.
>
>  Dave
>
>
>  -----Original Message-----
>  From: calvinlc at earthlink.net
>  To: fastscirocco_2000 at yahoo.com; cody at 5000tq.com; s-car-list at audifans.com
>  Sent: Thu, 28 Dec 2006 9:19 AM
>  Subject: Re: [s-cars] Turbo Replacements
>
>
> What if you were to hold the boost levels at the same as they were on the
> K-24, i.e. swap nothing except the turbo while running the same old MTM 1+
> software?  Does this still present a problem for the burnt valve and/or
> injectors?  What is the approximate max duty cycle that the stock injector
> sees with an MTM 1+ setup?
> --Calvin
>
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of chris chambers
> Sent: Wednesday, December 27, 2006 6:06 PM
> To: John Cody Forbes; Scar
> Subject: Re: [s-cars] Turbo Replacements
>
>
> John, the requirement of the RS2 EM isn't due to fitment, it's to
> prevent burnt valves.
>
>
> --- John Cody Forbes <cody at 5000tq.com> wrote:
>
>> Actually with option #3 there you don't need a new EM w/ GT2871,
>> though it's
>> still a very good idea. I just  put a GT2871 on a '93 S4 a few weeks
>> ago,
>> fitment of the turbo was fine with stock manifold and downpipe.
>>
>> -Cody Forbes
>> http://www.5000tq.com
>> '86 5k noT noQ
>> '86 5k noT noQ - Parting Out
>> '87 5ktq
>> '87 5ktq - Fast. Really Fast.
>>
>> Dave Forgie wrote:
>> > Paul: You have several options for turbo replacement (which I will
>> get
>> > wrong and somebody will correct me, no doubt):
>> >
>> > 1.  Rebuild you existing K24 turbo. - can be done but not very cost
>> > effective given you still end up with a K24.
>> > 2.  Buy a used K24 turbo from somebody who has upgraded their
>> turbo. -
>> > probably fairly cost effective if all you want to go is MTM+1 or
>> > equivalent
>> > 3.  RS2 turbo - a bit pricy.  Was THE ticket a few years ago but
>> there
>> > are better or bigger turbos for the same money or less.  You need
>> to
>> > upgrade the Exhaust manifold to RS2 EM or something from
>> 034Motorsport
>> > plus bigger injectors and new software, aka the "slippery slope".
>> Good
>> > for about 370 crank hp.
>> > 4. GT2871, GT3176 Garrett ball bearing turbos - these are the "new
>> > kids" on the block.  Good bang for the buck, similar to the RS2
>> turbo
>> > but more legs.  Still needs EM, injectors, and software upgrades.
>> > More grease on the slope.  Good for over 370 crank hp.
>> > 5. GT30R, GT35, GT35R - These are near the top or OVER the top.
>> Will
>> > make over 400 crank hp with EM, injectors, software, etc.  Totally
>> > greased slope.
>> >
>> > How much money you got?
>> >
>> > HTH
>> >
>> > I am sure others will chime in.
>> >
>> > Dave F.
>> > _______________________________________________
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>>
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>
>
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>
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