Turbo info for 4.0T

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10-09-2013, 10:09 AM

#21

txgriz

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Quote:

Originally Posted by DeerHunter

If increasing boost increases the intake temperature, and an increase in intake temps causes a boost increase, the negative feedback loop will eventually shut things down or destroy the engine.

This is a positive feedback loop and those are bad. Negative feedback is used to stabilize control loops. Sorry, the engineer in me needed to comment here.

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10-09-2013, 10:24 AM

#22

RobC

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Quote:

Originally Posted by sciblades

did we ever figure out what the rs7 turbo part #'s were?

I found the RS6 turbo part numbers:

left: 079 145 703K
right: 079 145 704K

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10-09-2013, 01:06 PM

#23

rmarin2

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Quote:

Originally Posted by sciblades

did we ever figure out what the rs7 turbo part #'s were?

ETKA shows the RS7 part numbers as:
Left: 079 145 703 S
Right 079 145 704 S

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10-09-2013, 01:24 PM

#24

DeerHunter

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Quote:

Originally Posted by txgriz

This is a positive feedback loop and those are bad. Negative feedback is used to stabilize control loops. Sorry, the engineer in me needed to comment here.

Fair enough. I guess I was all caught up in the negative effects of the positive feedback loop

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08-28-2018, 03:56 AM

#25

Dragonslayer

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Anyone with an A8 have any luck with these:

4.0TFSI RS7 CHRA Turbo Upgrade

I’m trying to make my 2017 A8L 4.0T go 200mph. With APR Stage I (545hp on 93AKI) I’m stuck at 188.8. First world problems. APR Downpipes will fit but APR stage II software is “in the works.” RS7 turbos will also fit but APR is only offering Stage III tuning for the S6, maybe also the S7, and that’s good for 634hp on 93 (different motor I know, but it’s close). I’d like to upgrade to S8 OEM cooling as well as a custom tune. My APR sweet talking skills are ineffective....just wondering if these turbos would be a good cost saving alternative to RS7 OEM turbos.

Has anyone had any luck updating their turbos, cooling and downpipes on their A8?

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08-28-2018, 09:49 AM

#26

m444

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silly rabbit motors
Have you contacted Silly Rabbit Motors?
http://sillyrabbitmotorsport.com/rs6-billet-turbo

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08-28-2018, 01:27 PM

#27

Dragonslayer

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No just browsed their website which says it’ll work for an A8. I was just trying to get some reviews, it’s not like amazon unfortunately where I can just scroll down a bit

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08-28-2018, 07:02 PM

#28

m444

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Quote:

Originally Posted by Dragonslayer

No just browsed their website which says it’ll work for an A8. I was just trying to get some reviews, it’s not like amazon unfortunately where I can just scroll down a bit

SRM "TRUE" High Flow 4.0TT intake system, they found the restriction!

DIY SRM Intake install:

SRM 4.0T turbo char upgrade:

SRM intercooler/ charge cooler:

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