'90 Coupe Quattro - '15 S8 4.0t - Triple disk and fuel lines

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

Postby 90quattrocoupe » Wed Jul 25, 2018 11:22 pm

Am I assuming you are going to cut and splice the axles? Doesn't the outer CV of the later axle have the same internal splines as the stock coupe?

On the radiator, you should make it a triple pass now and not wait. Your V8 motor puts out more heat than my 99 S8 motor and I ended up with a triple pass radiator. When you put a V8 in a coupe, you are basically putting a wall behind the radiator. So the air goes through the radiator and hits a wall. Not good for air flow. It took me almost a year to get my cooling down where I wanted it. It all changed the day I installed a triple pass radiator. Same fans, same shrouding and same thermo-switches. Only difference was installing a triple pass.

Like air, water takes the path of least resistance. When you use a front mount single pass radiator, you do not have even flow across the radiator. The pressure across the core is not the same. Some areas will move faster than others giving you uneven flow and uneven cooling.

My radiator is the exact size as the B4 radiator, as far as height and length goes. It is a little thicker as the dual cores used were a little thicker. Mine bolts in the car using B4 stock mounts. My radiator is lot smaller than your and thinner. My fans are set on a 93 degree switch and the thermostat is 85 degrees. If I am driving in any weather that is less than 80 degrees outside the fans never even come on.

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

Postby varia » Wed Jul 25, 2018 11:47 pm

you can use B3 and B4 FWD manual axle as well, they are the thickest from that era
¯\_(ツ)_/¯

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

Postby Haenszel » Thu Jul 26, 2018 12:06 am

No the stock coupe bearing cage and housing is significantly smaller and presumably weaker than the b7. Hence the knuckle clearancing. The internal splines are also significantly larger than the coupe parts. I’m not going to mess around with trying to keep factory parts, I’ll make the larger parts work. Will be getting custom shafts done by a company I’ve used before. They can make any shaft needed to make it all butter together like factory.

Radiator needs a bleed port welded in so maybe we’ll put some plates in the tanks then for triple pass!
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Thu Aug 02, 2018 9:43 pm

So got the transmission mounts and modified shifter rods sorted and a B7 shifter box in the car (with sound deadening for stealth).

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And I think I'm going to make custom hub knuckles all the way around to accept the a8/s8 wheel bearing and hub so I can run these trusty outer CV's... so that will essentially give me unbreakable axles (100% s8) all the way around.

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Next up is making the knuckles and making rear diff mounts for the b7 rear diff.... then measuring axle lengths and getting bars cut.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby audifreakjim » Fri Aug 03, 2018 12:00 pm

You had me at knuckle. Are you planning on dropping the ball joint mount at all?
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Fri Aug 03, 2018 12:32 pm

audifreakjim wrote:You had me at knuckle. Are you planning on dropping the ball joint mount at all?


That could be very easily done, what's the benefit on these cars? To keep arm angle at the correct angle when lowering?

What's the usual drop?


Also, the mail just came today and..... somebody sent me free RocEuro intake tubes!! They need some minor modification to fit, but they’re definitely gonna work so that’s awesome. Thanks Ahmad!!

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

Postby audifreakjim » Fri Aug 03, 2018 7:25 pm

A few of us have played with dropping them around 1.5". I got major torque steer and went back to stock, but the idea is to get the arms pointing down again so you don't loose camber in the corners.. You should address the tie rods at the same time so you don't end up with crazy different angles.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Tue Aug 21, 2018 12:46 pm

Got S8 hub machined down to fit inside the new rotors for the Boxster calipers. Will be pressing in the hub into the bearing tomorrow then on to designing the new knuckles for all 4 corners.

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Got the stock clutch/flywheel in for now, and transmission, mounts and shifter modified/installed. I have to bend the stabilizer bar a slight bit more for the shifter box to line up perfectly, but it works as-is so that's nice.

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I also got the ECU back again, and now I can get the idle down to where its supposed to be. Was having throttle body alignment issues before and it would only idle at 1350rpm.

Bit lopey, I like it.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby lorge1989 » Wed Aug 22, 2018 9:59 am

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

Postby Haenszel » Fri Aug 24, 2018 1:55 am

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Intakes chopped.

Driveshaft at the shop. Spare center diff welded. Next thing you’ll see is this thing moving under its own power. Rwd till proof of concept happens.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby varia » Sun Aug 26, 2018 3:38 pm

amazing!!!!!!!!!!!!!!!!!!!!!
¯\_(ツ)_/¯

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

Postby Grillage » Sun Aug 26, 2018 4:49 pm

This is some next level shit right here -- unreal!
CURRENT
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1993 Audi 90 CS Quattro - 1990 CQ - V8 - 1995.5 Audi S6 - 1993 Audi V8 - 2013 A5 Prestige - 2011 A4 Avant - 1986 Maserati Biturbo Spyder
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby dana » Mon Aug 27, 2018 8:08 am

Grillage wrote:This is some next level shit right here -- unreal!

That statement pretty much sums it up. I have nothing to add, but I'm glad you're posting here for the bench racers like me to drool over!
current:
-mk4 tdi wagon with some mods
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-the turbo tractor
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby the german » Tue Aug 28, 2018 12:16 am

ungh. so good.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Tue Aug 28, 2018 5:27 pm

Thanks guys. It’s gettin there now!

Car has been sitting for over 10 years outside, so the paint turned into a black chalkboard. Spent the afternoon shining up the drivers side and roof, and boy did it make me feel a whole lot better about this car! Lookin great now!

.... still 1 more side to do...

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

Postby PRY4SNO » Wed Aug 29, 2018 11:40 am

Nice thing about these cars having such hard paint is it buffs up nicely. It's going to look filthy by the time you get out of the driveway though, haha
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Wed Sep 05, 2018 7:56 am

It’s the little things. B7 s4 factory fan control modules integrated into the s8 Ecu. All factory, all good. Fans themselves will have to be slim, probably 4x10” SPAL curved blades.




Also modeling for the new hub knuckles has begun. Have a friend Erik helping me with this stuff, so hopefully we can get this finished up in a week or two and start cutting metal!

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

Postby Haenszel » Sat Sep 08, 2018 10:13 am

It’s time for business socks.

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

Postby PRY4SNO » Sat Sep 08, 2018 2:30 pm

Saw this on Instagram, congrats! Sounds like a beast!
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|| 2010 Golf Sportwagen TDI /// Farmenwagen
|| 1992 80 quattro 20v /// Eventual AAN'd Winter Sled
|| 1990 Coupe quattro /// Because Racecar

|| Spare parts for sale
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby jbrentd » Sat Sep 08, 2018 4:29 pm

Gonna be a beast! Nice job.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Thu Oct 11, 2018 3:54 pm

FIrst drive, Success!

Clearly needs some calibration, but proof of concept seems good in my book!

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

Postby Lucky » Thu Oct 11, 2018 6:29 pm

1988 audi 80, 1994 Urs4, 2005 Ranger
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby speeding-g60 » Thu Oct 11, 2018 11:30 pm

such restraint you show.

i wouldnt be able to contain myself and i would stab that biotch like no other.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby lorge1989 » Fri Oct 12, 2018 7:59 am

Do you even lift? Keep the power steering pump at home. :D
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

http://dubsinthebuff.com
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Fri Oct 12, 2018 8:32 am

speeding-g60 wrote:such restraint you show.

i wouldnt be able to contain myself and i would stab that biotch like no other.


Well, there's only 2 flywheel bolts cuz I just plopped an s4 flywheel in so..... safety first :) Plus the tune definitely needs love.

lorge1989 wrote:Do you even lift? Keep the power steering pump at home. :D


I have a Mini PS pump on the way, I ain't no man!

Next up is clean up of bay, clutch, wrap up fuel lines, brake lines, and whatever else, then off to my friend Jay for exhaust. :drive:
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