'90 Coupe Quattro - '15 S8 4.0t Swap

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'90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Fri May 18, 2018 1:16 am

It's been a while since I've created a build thread and it feels good to get into this again. Been a while!

Starting out with a '90 CQ that's been sitting for 10 years. Got it running as-was, which was fun to do some donuts in the field.... thought its still covered in a lot of..... gunk.

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Afterwhich I immediately pulled out the stock engine, and dropped in a 2015 s8 engine, currently bolted to the stock 01a trans just for placement. No clutch or anything at the moment but we'll get there.

The plan is:
-S8 engine
-Stock ecu w/IMMO+tune, stock fuel pump/controller + can gateway
-b7 s4 0a3 transmission
-FX850 twin disk (I love this clutch)
-S8 inner CV's + shafts (custom length), strongest outer CV's I can find
-b7 driveshaft - custom length
-b7 rear diff
-Twin 2.5" exhaust
- 5x112 Porsche calipers in front, b7 rear
-squeeze as much cooling in, including as much intercooler heat exchangers as I can fit
-Make it nice, paint it pearl white, etc....

Currently the engine is in, bolted to the stock 01a trans. I've made engine mounts, including removing the stock drivers side mount and completely rebuilt the mount in a fitting location. So far, all I've had to move is one of the aux water pumps with a mild relocation to the side of the engine to clear the steering bars and bash a nice dent into the drivers side of the subframe to clear the oil pan + bolts slightly. Nothing big, fits like its meant to be there. The hood even closes without issues and 2 inches to spare! Big surprise to me, but I'm not complaining.

Huge plus to this swap is the reliability factor. I've been through plenty of builds and rebuilds and explosions, and its time to hang the hat and build something that is fun and reliable. It might not be the fastest thing on the planet but it sure as shit should be a ton of fun!

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Follow along, this will be the only build thread I have for this car, and the only place I will keep regular updates.
'00 a4 Avant - VR6 Turbo 6766 - 812whp - 10.201@143.35
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Postby lorge1989 » Fri May 18, 2018 6:57 am

Yes! What made you ditch the standalone idea? Can't blame ya, when Audi did a lot of the work for you using the stock stuff.
1988 Audi 90Q 1.8T 20v megasquirt'd and Holset'd
1994 Audi 90Q V6 oil burner, soon to be ABZ
1978 GMC High Sierra

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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Lucky » Fri May 18, 2018 7:03 am

That's pretty awesome, I didn't realize you could bolt that to an 01a. How many of the holes line up?
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby PRY4SNO » Fri May 18, 2018 7:24 am

Well, this is gonna be good .
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|| 2010 Golf Sportwagen TDI /// Farmenwagen
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|| 1990 Coupe quattro /// Because Racecar

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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Fri May 18, 2018 7:48 am

lorge1989 wrote:Yes! What made you ditch the standalone idea? Can't blame ya, when Audi did a lot of the work for you using the stock stuff.


Mostly the displacement on demand cam changeovers and the PWM everything, including variable oil pressures and all sorts of water pumps. Just too much! Stock Ecu might freak out yet, I’m not sure. We will see in a few weeks.

Lucky wrote:That's pretty awesome, I didn't realize you could bolt that to an 01a. How many of the holes line up?

Only 4 bolt holes line up on 01a, but the 0a3 will have a lot more I think. The car will never drive with this trans anyways, just in there for engine placement.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Lucky » Fri May 18, 2018 9:59 am

Haenszel wrote:Only 4 bolt holes line up on 01a, but the 0a3 will have a lot more I think. The car will never drive with this trans anyways, just in there for engine placement.


That's still more than I would have expected!
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby audifreakjim » Fri May 18, 2018 12:29 pm

This is going to be a riot, I have been following on FB, glad you started a build thread!
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby pilihp2 » Fri May 18, 2018 12:57 pm

Spit in my mouth twice

Excited for this
-Phil
87 5ktq - 20vt
91 v8 5spd - I guess I'm a masochist
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16 KTM 690 Duke - 2 wheeled hooliganism

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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby versacehobo » Fri May 18, 2018 6:16 pm

holy shit. he's back... ill be following closely.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby the german » Fri May 18, 2018 8:17 pm

Thanks for making a build thread! I am very interested in this and especially what you find with making the stock engine management work. I reallllly want this to work.
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby 85oceanic » Fri May 18, 2018 8:20 pm

This is going to be a TORQUE BEAST! So sick.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Mcstiff » Fri May 18, 2018 9:42 pm

Crazy! What's the engine weight?
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby 85oceanic » Sat May 19, 2018 10:05 am

Side bar, I might suggest replacing the crankcase vent valve underneath of the turbos before you get the car together. We replace these ALL THE TIME here at work.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Sat May 19, 2018 10:57 am

Mcstiff wrote:Crazy! What's the engine weight?


A freakin lot. Something like 480 lbs by my research. But it doesn’t even sink the front end like I thought it would. Front suspension is still higher than the rear which is surprising.

85oceanic wrote:Side bar, I might suggest replacing the crankcase vent valve underneath of the turbos before you get the car together. We replace these ALL THE TIME here at work.


What kinda mileage? Is it an updated part or just replacement? This thing has 12k.

Also, who knows the strongest outer cv’s one can fit on a coupe? Have 5x112 stuff going in.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby 85oceanic » Sat May 19, 2018 1:09 pm

I have seen them go out as early as 20k miles, but normally I see them go out at 30k-ish. That being said, replacement units do have an updated diaphragm to help reduce failures.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Mon May 21, 2018 11:36 am

85oceanic wrote:I have seen them go out as early as 20k miles, but normally I see them go out at 30k-ish. That being said, replacement units do have an updated diaphragm to help reduce failures.


Happen to have an updated part #? As mine's a bit newer engine I'd like to see if its got a newer version.

Thanks
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby AudiSport4000 » Mon May 21, 2018 5:15 pm

*pants tighten*

Very unique and exciting. Will be watching this one closely :)
1986 4kq CE
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby vt10vt » Mon May 21, 2018 7:07 pm

Saw the title, immediately thought "that's awful ambitious," then saw who had posted, and got very, very excited.

Good luck, can't wait to see it come together, please post lots of pictures!
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Tue May 22, 2018 1:21 pm

vt10vt wrote:Saw the title, immediately thought "that's awful ambitious," then saw who had posted, and got very, very excited.

Good luck, can't wait to see it come together, please post lots of pictures!

Well that's quite... humbling. I appreciate it!

I'll document best I can, waiting on ECU back at the moment as well as factory fuel pump/controller and CAN gateway to come from the same car the engine was from. Have a friends soon-to-be rally car coming to my house so we can get it ready to go for STPR by May 30th, going to be a cruch. After that I will tow the car up to my house soon and try to get it fired up!
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby 85oceanic » Wed May 23, 2018 3:30 pm

Haenszel wrote:
85oceanic wrote:I have seen them go out as early as 20k miles, but normally I see them go out at 30k-ish. That being said, replacement units do have an updated diaphragm to help reduce failures.


Happen to have an updated part #? As mine's a bit newer engine I'd like to see if its got a newer version.

Thanks


Most updated PN is: 079103542E
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby alxdgr8 » Thu May 31, 2018 6:58 pm

YES! Can't wait to see the progress.
Would LOVE one of these engines in my D2 S8.
-Alex- @vexartmedia on Instagram
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Thu May 31, 2018 9:40 pm

Well, got my ECU De-Immobilized and tore into the wiring diagrams today.

Pc, new vagcom cable and immobilized ECU ready to go.
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Took this big fat book of diagrams:
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Initially pinned it out directly from the Ecu, including pedals, CAN gateway, fuel pump wiring, OBD Port Image

Then I revisited it and found all the pins on the T17 pass-through plugs so all factory relays are incorporated with exception of the starter relays. Also have to bypass the “push to start” capability because I’m not running the interior module.
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So.... I will give this a shot tomorrow and depending on how much time I have I will at least get the vagcom to connect, and maybe get starter and fuel pump working. Excited to give it life!!
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby the german » Fri Jun 01, 2018 9:37 am

Very excited to see this working! :D
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Fri Jun 01, 2018 10:13 am

Also, as unfortunate as it is, I do want to reiterate the engine will not start for now. There is no flywheel attached. Baby steps, I guess.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby versacehobo » Fri Jun 01, 2018 10:20 am

You get stuff done quickly, Brian.

Nice work. Will follow intently, loved the old vr6 build thread (and a4 before that).
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