A6 c5 4.2 turbo(?)

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letsgoo

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	A6 c5 4.2 turbo(?) « on: April 01, 2023, 02:58:45 AM »

Hello!

First I wanna say thanks to all contributors here!

I´m planning a project as follows;

Car is A6 4.2 1999

Change gearbox to 6hp26, bought one and rear diff from S6 c6. Why? Stock gearbox is giving up soon I think and this is 6gear.
Holds more power.

Single turbo kit.

One solution is running a RS6 c5 ECU, found one locally, not bought yet. But the can bus needs to change to talk to the transmission I think?

6hp26 is also found in A8 2003 ME7.1.1 also, maybe I could read the CAN protocol of those?

RS6 also use two MAFs, haven't looked into that.

Have been searching for a couple of days but no luck finding answers on CAN protocol.

I have a A6 C6 with 6hp19, could maybe read the CAN from it?

Plan B is aftermarket ECU and TCU, but no fun? Grin

Have read;

http://nefariousmotorsports.com/forum/index.php?topic=18881.0

http://nefariousmotorsports.com/forum/index.php?topic=19145.15

http://nefariousmotorsports.com/forum/index.php?topic=20887.0

EDIT; In this thread _nameless helps Stoti get an older ECU talk to 6hp tcu;

http://nefariousmotorsports.com/forum/index.php?topic=17945.15

Thanks


« Last Edit: April 01, 2023, 02:48:57 PM by letsgoo »	Logged

_nameless

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	Re: A6 c5 4.2 turbo(?) « Reply #1 on: April 01, 2023, 08:20:19 AM »

Quote from: letsgoo on April 01, 2023, 02:58:45 AM

In this thread Stoti get an older ECU talk to 6hp tcu;

http://nefariousmotorsports.com/forum/index.php?topic=17945.15

Thanks

Because I told him what software to use and what bits to change....


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letsgoo

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	Re: A6 c5 4.2 turbo(?) « Reply #2 on: April 01, 2023, 02:40:10 PM »

Quote from: _nameless on April 01, 2023, 08:20:19 AM

Because I told him what software to use and what bits to change....

Yes, I´ve edited the post. Sorry.

Do you think it's doable?


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prj

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	Re: A6 c5 4.2 turbo(?) « Reply #3 on: April 01, 2023, 04:27:15 PM »

Step 1. Sell all the current shit and buy an RS6 C5, it's not like they are expensive anymore.
Step 2. Drive it.

After that if you want to swap a 6HP trans into it you can, although the 5HP in the C5 properly mapped can take 1000nm.
Stock TCU file the gear holding pressures max out and it starts slipping and blows up the trans eventually even with a decent tune, that's why they have a bad rep.


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letsgoo

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	Re: A6 c5 4.2 turbo(?) « Reply #4 on: April 01, 2023, 10:36:05 PM »

Quote from: prj on April 01, 2023, 04:27:15 PM

No I want a new project.

I'm not new into building cars, but in this Audi world.
This car also makes a great sleeper, a little bit off rust here and there Cool

Thanks for the information, I appreciate it. Might keep the 5hp for starters then. Replace the a-clutch/drum.
The valvebody had a crack in it when I got the car, but with help from friends it's welded/resurfaced and now running for 2 years.

Have to read up on TCU tuning Huh


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prj

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	Re: A6 c5 4.2 turbo(?) « Reply #5 on: April 02, 2023, 04:09:54 AM »

It makes 0 sense to build something that already exists.
Spend your energy to make something that does not exist.

If this engine was not in this chassis, okay. But it's literally in an A6 C5. Building it properly is going to be much more expensive than getting a RS6 C5 and the result will be much worse.


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letsgoo

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	Re: A6 c5 4.2 turbo(?) « Reply #6 on: April 02, 2023, 06:31:11 AM »

Okey, thanks for sharing your opinion.

This is not a money issue, but I rather see a challenge in building a fast car on the budget.
But I don't see how this gonna cost me 10k $ to build Huh

Parts I don't have for the moment;

Turbo
Intercooler
Injectors
Fuel pump/line

Ecu - aftermarket or stock RS6

Run E85

Hot/cold side, can fab self.


« Last Edit: April 02, 2023, 06:39:42 AM by letsgoo »	Logged

prj

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	Re: A6 c5 4.2 turbo(?) « Reply #7 on: April 02, 2023, 10:08:24 AM »

10k would be very cheap. I would wager close to double that, after it's tuned and running correctly.
"on the budget" is sell this and buy RS6.


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letsgoo

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	Re: A6 c5 4.2 turbo(?) « Reply #8 on: April 02, 2023, 11:46:50 AM »

20k $ is if I leave it to a shop to do it, right?

I plan to build by myself


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prj

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	Re: A6 c5 4.2 turbo(?) « Reply #9 on: April 02, 2023, 01:56:42 PM »

Quote from: letsgoo on April 02, 2023, 11:46:50 AM

20k $ is if I leave it to a shop to do it, right?

I plan to build by myself

What will happen is, that you're gonna throw this together somehow (maybe), and nobody in their right mind is going to touch the tuning on it.
So then you're gonna have to get a standalone.
No standalone will work with 5hp or 6hp autobox, so factor manual swap into it as well.

In the end you're gonna sell it for parts Tongue

Don't listen to me man, just go YOLO who cares Cheesy


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letsgoo

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	Re: A6 c5 4.2 turbo(?) « Reply #10 on: April 03, 2023, 01:44:15 PM »

Yeah YOLO

First step will be getting it to run on RS6 ecu I think Huh

Can prove to be enough of a challenge


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_nameless

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	Re: A6 c5 4.2 turbo(?) « Reply #11 on: May 17, 2023, 06:46:43 AM »

Quote from: letsgoo on April 01, 2023, 02:40:10 PM

Do you think it's doable?

With enough money anything is possible. If you need a tuning solution for this setup I can do it.


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letsgoo

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	Re: A6 c5 4.2 turbo(?) « Reply #12 on: May 19, 2023, 02:06:36 AM »

****removed dumb shit

read more, type less...


« Last Edit: May 08, 2024, 11:37:58 AM by letsgoo »	Logged

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