Needing to consort with the Audi Collective.
01-10-2003, 12:07 AM
#1
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Needing to consort with the Audi Collective.
I was wondering if their was an aftermarket twin turbo conversion for the naturally Asperated 2.8 L A4. If such a thing exist what else would I need to add to my car to compensate placing the turbo's on my A4. Detailed information would be highly appreciated. Thanks.
01-10-2003, 07:29 AM
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Survey says...
A single turbo, using just half of the S4 combo would be sufficient given the high compression and thinner walls of the 2.8. Some guy keeps posting that he's developing one (see archives).
Superchargers without intercoolers are a mixed blessing at best.
Superchargers without intercoolers are a mixed blessing at best.
01-10-2003, 11:33 AM
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Actually, I would think the twin turbo K03 would be best....
asking a single K03 to feed a 2.8 liter motor is probably too much. That's 50% more flow than a K03 on a 1.8
Twin K03's operating at 5psi or so would probably keep them in thier efficiency range, which should help keep the intake temps in check.
Twin K03's operating at 5psi or so would probably keep them in thier efficiency range, which should help keep the intake temps in check.
01-10-2003, 02:08 PM
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Same trick as the low pressure Volvo.
The 2.8 is not that far away from detonation. With stock compression and timing it would still be well within limits.
The turbo is small, agreed (and not that great to begin with). A single low-boost turbo would be sufficient with an intercooler.
But, all the packaging is done, and the cost would be half of the alternative.
The turbo is small, agreed (and not that great to begin with). A single low-boost turbo would be sufficient with an intercooler.
But, all the packaging is done, and the cost would be half of the alternative.
01-10-2003, 04:35 PM
#7
Re: Survey says...
Rob K on the 80/90 forum has a single turbo (bigger Garrett?), intercooled 12v V6 with a TEC2 controller and 8.5:1 JE pistons...
And I will say that the walls on the 82.5mm bore engines are thin. Both the 7A and AAH I've worked on/taken apart had noticably thinner walls than the MC.
And I will say that the walls on the 82.5mm bore engines are thin. Both the 7A and AAH I've worked on/taken apart had noticably thinner walls than the MC.
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01-11-2003, 02:53 PM
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the 2.7 and 2.8 are not relater...
iirc the 2.7 is 90 degree V while 2.8 is 60 degree V. the reason for 2.7 l is the bore and stroke are same as 1.8t and the R8 3.6l engines.
01-12-2003, 08:28 PM
#10
Re: the 2.7 and 2.8 are not relater...
Audi has been using 81mm bores with 86.4mm strokes since the 2226cc 5 cylinder turbos. Prior to that, they used 79.5mm bores with the 86.4mm stroke for the 2144cc 5 cyl. turbos. The 82.5mm bore is nothing new either, that started around 1987 in the NF and NG code 10v non-turbo engines.
The 2.7l 30vtt is a 90 degree Vee, and the 2.8L 12v and 30v were both 90 degree Vees. All of Audi's Vee engines are 90 degrees actually, starting with the 1990 V8q. VR engines are VW bits, so don't say anything about the 15deg. angle on those ;-)
Anyway, AFAIK, the smaller bore of the FI cars is due to the cylinder pressures.
The 2.7l 30vtt is a 90 degree Vee, and the 2.8L 12v and 30v were both 90 degree Vees. All of Audi's Vee engines are 90 degrees actually, starting with the 1990 V8q. VR engines are VW bits, so don't say anything about the 15deg. angle on those ;-)
Anyway, AFAIK, the smaller bore of the FI cars is due to the cylinder pressures.